Added the test_api_exists test to the CurrencyTestCase test case.

.gitignore

@@ -37,4 +37,4 @@ excludes
 *.pot
 *.mo
 zh_Hans
-node_modules
+test_temp.py

docs/source/accounting.account.rst

@@ -0,0 +1,53 @@
+accounting.account package
+==========================
+
+Submodules
+----------
+
+accounting.account.commands module
+----------------------------------
+
+.. automodule:: accounting.account.commands
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+accounting.account.converters module
+------------------------------------
+
+.. automodule:: accounting.account.converters
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+accounting.account.forms module
+-------------------------------
+
+.. automodule:: accounting.account.forms
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+accounting.account.query module
+-------------------------------
+
+.. automodule:: accounting.account.query
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+accounting.account.views module
+-------------------------------
+
+.. automodule:: accounting.account.views
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+Module contents
+---------------
+
+.. automodule:: accounting.account
+   :members:
+   :undoc-members:
+   :show-inheritance:

docs/source/accounting.base_account.rst

@@ -12,18 +12,10 @@ accounting.base\_account.commands module
    :undoc-members:
    :show-inheritance:
 
-accounting.base\_account.database module
-----------------------------------------
+accounting.base\_account.converters module
+------------------------------------------
 
-.. automodule:: accounting.base_account.database
-   :members:
-   :undoc-members:
-   :show-inheritance:
-
-accounting.base\_account.models module
---------------------------------------
-
-.. automodule:: accounting.base_account.models
+.. automodule:: accounting.base_account.converters
    :members:
    :undoc-members:
    :show-inheritance:

docs/source/accounting.currency.rst

@@ -0,0 +1,53 @@
+accounting.currency package
+===========================
+
+Submodules
+----------
+
+accounting.currency.commands module
+-----------------------------------
+
+.. automodule:: accounting.currency.commands
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+accounting.currency.converters module
+-------------------------------------
+
+.. automodule:: accounting.currency.converters
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+accounting.currency.forms module
+--------------------------------
+
+.. automodule:: accounting.currency.forms
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+accounting.currency.query module
+--------------------------------
+
+.. automodule:: accounting.currency.query
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+accounting.currency.views module
+--------------------------------
+
+.. automodule:: accounting.currency.views
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+Module contents
+---------------
+
+.. automodule:: accounting.currency
+   :members:
+   :undoc-members:
+   :show-inheritance:

docs/source/accounting.rst

@@ -7,12 +7,22 @@ Subpackages
 .. toctree::
    :maxdepth: 4
 
+   accounting.account
    accounting.base_account
+   accounting.currency
    accounting.utils
 
 Submodules
 ----------
 
+accounting.database module
+--------------------------
+
+.. automodule:: accounting.database
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
 accounting.locale module
 ------------------------
 
@@ -21,6 +31,14 @@ accounting.locale module
    :undoc-members:
    :show-inheritance:
 
+accounting.models module
+------------------------
+
+.. automodule:: accounting.models
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
 Module contents
 ---------------
 

docs/source/accounting.utils.rst

@@ -4,6 +4,14 @@ accounting.utils package
 Submodules
 ----------
 
+accounting.utils.next\_url module
+---------------------------------
+
+.. automodule:: accounting.utils.next_url
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
 accounting.utils.pagination module
 ----------------------------------
 
@@ -28,6 +36,30 @@ accounting.utils.query module
    :undoc-members:
    :show-inheritance:
 
+accounting.utils.random\_id module
+----------------------------------
+
+.. automodule:: accounting.utils.random_id
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+accounting.utils.strip\_text module
+-----------------------------------
+
+.. automodule:: accounting.utils.strip_text
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+accounting.utils.user module
+----------------------------
+
+.. automodule:: accounting.utils.user
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
 Module contents
 ---------------
 

setup.cfg

@@ -17,7 +17,7 @@
 
 [metadata]
 name = mia-accounting-flask
-version = 0.1.1
+version = 0.2.0
 author = imacat
 author_email = imacat@mail.imacat.idv.tw
 description = The Mia! Accounting Flask project.

src/accounting/__init__.py

@@ -20,7 +20,6 @@
 import typing as t
 
 from flask import Flask, Blueprint
-from flask_sqlalchemy.model import Model
 
 from accounting.utils.user import AbstractUserUtils
 
@@ -56,7 +55,7 @@ def init_app(app: Flask, user_utils: AbstractUserUtils,
     locale.init_app(app, bp)
 
     from .utils import permission
-    permission.init_app(app, can_view_func, can_edit_func)
+    permission.init_app(bp, can_view_func, can_edit_func)
 
     from . import base_account
     base_account.init_app(app, bp)
@@ -64,9 +63,10 @@ def init_app(app: Flask, user_utils: AbstractUserUtils,
     from . import account
     account.init_app(app, bp)
 
-    from .utils.next_url import append_next, inherit_next, or_next
-    bp.add_app_template_filter(append_next, "append_next")
-    bp.add_app_template_filter(inherit_next, "inherit_next")
-    bp.add_app_template_filter(or_next, "or_next")
+    from . import currency
+    currency.init_app(app, bp)
+
+    from .utils import next_url
+    next_url.init_app(bp)
 
     app.register_blueprint(bp)

src/accounting/account/__init__.py

@@ -23,8 +23,8 @@ from flask import Flask, Blueprint
 def init_app(app: Flask, bp: Blueprint) -> None:
     """Initialize the application.
 
-    :param bp: The blueprint of the accounting application.
     :param app: The Flask application.
+    :param bp: The blueprint of the accounting application.
     :return: None.
     """
     from .converters import AccountConverter

src/accounting/account/forms.py

@@ -32,7 +32,7 @@ from accounting.utils.user import get_current_user_pk
 
 
 class BaseAccountExists:
-    """The validator to check if the base account code exists."""
+    """The validator to check if the base account exists."""
 
     def __call__(self, form: FlaskForm, field: StringField) -> None:
         if field.data == "":
@@ -42,13 +42,25 @@ class BaseAccountExists:
                 "The base account does not exist."))
 
 
+class BaseAccountAvailable:
+    """The validator to check if the base account is available."""
+
+    def __call__(self, form: FlaskForm, field: StringField) -> None:
+        if field.data == "":
+            return
+        if len(field.data) != 4:
+            raise ValidationError(lazy_gettext(
+                "The base account is not available."))
+
+
 class AccountForm(FlaskForm):
     """The form to create or edit an account."""
     base_code = StringField(
         filters=[strip_text],
         validators=[
             DataRequired(lazy_gettext("Please select the base account.")),
-            BaseAccountExists()])
+            BaseAccountExists(),
+            BaseAccountAvailable()])
     """The code of the base account."""
     title = StringField(
         filters=[strip_text],

src/accounting/account/views.py

@@ -38,7 +38,7 @@ bp: Blueprint = Blueprint("account", __name__)
 @bp.get("", endpoint="list")
 @has_permission(can_view)
 def list_accounts() -> str:
-    """Lists the base accounts.
+    """Lists the accounts.
 
     :return: The account list.
     """
@@ -139,7 +139,7 @@ def update_account(account: Account) -> redirect:
                                              account=account)))
     with db.session.no_autoflush:
         form.populate_obj(account)
-    if not db.session.is_modified(account):
+    if not account.is_modified:
         flash(lazy_gettext("The account was not modified."), "success")
         return redirect(inherit_next(url_for("accounting.account.detail",
                                              account=account)))
@@ -159,9 +159,7 @@ def delete_account(account: Account) -> redirect:
     :return: The redirection to the account list on success, or the account
         detail on error.
     """
-    for l10n in account.l10n:
-        db.session.delete(l10n)
-    db.session.delete(account)
+    account.delete()
     sort_accounts_in(account.base_code, account.id)
     db.session.commit()
     flash(lazy_gettext("The account is deleted successfully."), "success")

src/accounting/base_account/__init__.py

@@ -23,8 +23,8 @@ from flask import Flask, Blueprint
 def init_app(app: Flask, bp: Blueprint) -> None:
     """Initialize the application.
 
-    :param bp: The blueprint of the accounting application.
     :param app: The Flask application.
+    :param bp: The blueprint of the accounting application.
     :return: None.
     """
     from .converters import BaseAccountConverter

src/accounting/currency/__init__.py

@@ -0,0 +1,38 @@
+# The Mia! Accounting Flask Project.
+# Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/6
+
+#  Copyright (c) 2023 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+"""The currency management.
+
+"""
+from flask import Flask, Blueprint
+
+
+def init_app(app: Flask, bp: Blueprint) -> None:
+    """Initialize the application.
+
+    :param app: The Flask application.
+    :param bp: The blueprint of the accounting application.
+    :return: None.
+    """
+    from .converters import CurrencyConverter
+    app.url_map.converters["currency"] = CurrencyConverter
+
+    from .views import bp as currency_bp, api_bp as currency_api_bp
+    bp.register_blueprint(currency_bp, url_prefix="/currencies")
+    bp.register_blueprint(currency_api_bp, url_prefix="/api/currencies")
+
+    from .commands import init_currencies_command
+    app.cli.add_command(init_currencies_command)

src/accounting/currency/commands.py

@@ -0,0 +1,78 @@
+# The Mia! Accounting Flask Project.
+# Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/6
+
+#  Copyright (c) 2023 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+"""The console commands for the currency management.
+
+"""
+import os
+
+import click
+from flask.cli import with_appcontext
+
+from accounting.database import db
+from accounting.models import Currency, CurrencyL10n
+from accounting.utils.user import has_user, get_user_pk
+
+CurrencyData = tuple[str, str, str, str]
+
+
+def __validate_username(ctx: click.core.Context, param: click.core.Option,
+                        value: str) -> str:
+    """Validates the username for the click console command.
+
+    :param ctx: The console command context.
+    :param param: The console command option.
+    :param value: The username.
+    :raise click.BadParameter: When validation fails.
+    :return: The username.
+    """
+    value = value.strip()
+    if value == "":
+        raise click.BadParameter("Username empty.")
+    if not has_user(value):
+        raise click.BadParameter(f"User {value} does not exist.")
+    return value
+
+
+@click.command("accounting-init-currencies")
+@click.option("-u", "--username", metavar="USERNAME", prompt=True,
+              help="The username.", callback=__validate_username,
+              default=lambda: os.getlogin())
+@with_appcontext
+def init_currencies_command(username: str) -> None:
+    """Initializes the currencies."""
+    data: list[CurrencyData] = [
+        ("TWD", "New Taiwan dollar", "新臺幣", "新台币"),
+        ("USD", "United States dollar", "美元", "美元"),
+    ]
+    creator_pk: int = get_user_pk(username)
+    existing: list[Currency] = Currency.query.all()
+    existing_code: set[str] = {x.code for x in existing}
+    to_add: list[CurrencyData] = [x for x in data if x[0] not in existing_code]
+    if len(to_add) == 0:
+        click.echo("No more currency to add.")
+        return
+
+    db.session.bulk_save_objects(
+        [Currency(code=x[0], name_l10n=x[1],
+                  created_by_id=creator_pk, updated_by_id=creator_pk)
+         for x in data])
+    db.session.bulk_save_objects(
+        [CurrencyL10n(currency_code=x[0], locale=y[0], name=y[1])
+         for x in data for y in (("zh_Hant", x[2]), ("zh_Hans", x[3]))])
+    db.session.commit()
+
+    click.echo(F"{len(to_add)} added.  Currencies initialized.")

src/accounting/currency/converters.py

@@ -0,0 +1,48 @@
+# The Mia! Accounting Flask Project.
+# Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/6
+
+#  Copyright (c) 2023 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+"""The path converters for the currency management.
+
+"""
+from flask import abort
+from werkzeug.routing import BaseConverter
+
+from accounting.database import db
+from accounting.models import Currency
+
+
+class CurrencyConverter(BaseConverter):
+    """The currency converter to convert the currency code and to the
+    corresponding currency in the routes."""
+
+    def to_python(self, value: str) -> Currency:
+        """Converts a currency code to a currency.
+
+        :param value: The currency code.
+        :return: The corresponding currency.
+        """
+        currency: Currency | None = db.session.get(Currency, value)
+        if currency is None:
+            abort(404)
+        return currency
+
+    def to_url(self, value: Currency) -> str:
+        """Converts a currency to its code.
+
+        :param value: The currency.
+        :return: The code.
+        """
+        return value.code

src/accounting/currency/forms.py

@@ -0,0 +1,93 @@
+# The Mia! Accounting Flask Project.
+# Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/6
+
+#  Copyright (c) 2023 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+"""The forms for the currency management.
+
+"""
+from __future__ import annotations
+
+import sqlalchemy as sa
+from flask_wtf import FlaskForm
+from wtforms import StringField, ValidationError
+from wtforms.validators import DataRequired, Regexp, NoneOf
+
+from accounting.database import db
+from accounting.locale import lazy_gettext
+from accounting.models import Currency
+from accounting.utils.strip_text import strip_text
+from accounting.utils.user import get_current_user_pk
+
+
+class CurrencyForm(FlaskForm):
+    """The form to create or edit a currency."""
+    CODE_BLOCKLIST: list[str] = ["create", "store", "exists-code"]
+    """The reserved codes that are not available."""
+
+    class CodeUnique:
+        """The validator to check if the code is unique."""
+        def __call__(self, form: CurrencyForm, field: StringField) -> None:
+            if field.data == "":
+                return
+            if form.obj_code is not None and form.obj_code == field.data:
+                return
+            if db.session.get(Currency, field.data) is not None:
+                raise ValidationError(lazy_gettext(
+                    "Code conflicts with another currency."))
+
+    code = StringField(
+        filters=[strip_text],
+        validators=[DataRequired(lazy_gettext("Please fill in the code.")),
+                    Regexp(r"^[A-Z]{3}$",
+                           message=lazy_gettext(
+                               "Code can only be composed of 3 upper-cased"
+                               " letters.")),
+                    NoneOf(CODE_BLOCKLIST, message=lazy_gettext(
+                        "This code is not available.")),
+                    CodeUnique()])
+    """The code.  It may not conflict with another currency."""
+    name = StringField(
+        filters=[strip_text],
+        validators=[DataRequired(lazy_gettext("Please fill in the name."))])
+    """The name."""
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.obj_code: str | None = None
+        """The current code of the currency, or None when adding a new
+        currency."""
+
+    def populate_obj(self, obj: Currency) -> None:
+        """Populates the form data into a currency object.
+
+        :param obj: The currency object.
+        :return: None.
+        """
+        is_new: bool = obj.code is None
+        obj.code = self.code.data
+        obj.name = self.name.data
+        if is_new:
+            current_user_pk: int = get_current_user_pk()
+            obj.created_by_id = current_user_pk
+            obj.updated_by_id = current_user_pk
+
+    def post_update(self, obj) -> None:
+        """The post-processing after the update.
+
+        :return: None
+        """
+        current_user_pk: int = get_current_user_pk()
+        obj.updated_by_id = current_user_pk
+        obj.updated_at = sa.func.now()

src/accounting/currency/query.py

@@ -0,0 +1,44 @@
+# The Mia! Accounting Flask Project.
+# Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/6
+
+#  Copyright (c) 2023 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+"""The currency query.
+
+"""
+import sqlalchemy as sa
+from flask import request
+
+from accounting.models import Currency, CurrencyL10n
+from accounting.utils.query import parse_query_keywords
+
+
+def get_currency_query() -> list[Currency]:
+    """Returns the base accounts, optionally filtered by the query.
+
+    :return: The base accounts.
+    """
+    keywords: list[str] = parse_query_keywords(request.args.get("q"))
+    if len(keywords) == 0:
+        return Currency.query.order_by(Currency.code).all()
+    conditions: list[sa.BinaryExpression] = []
+    for k in keywords:
+        l10n: list[CurrencyL10n] = CurrencyL10n.query\
+            .filter(CurrencyL10n.name.contains(k)).all()
+        l10n_matches: set[str] = {x.account_code for x in l10n}
+        conditions.append(sa.or_(Currency.code.contains(k),
+                                 Currency.name_l10n.contains(k),
+                                 Currency.code.in_(l10n_matches)))
+    return Currency.query.filter(*conditions)\
+        .order_by(Currency.code).all()

src/accounting/currency/views.py

@@ -0,0 +1,178 @@
+# The Mia! Accounting Flask Project.
+# Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/6
+
+#  Copyright (c) 2023 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+"""The views for the currency management.
+
+"""
+from urllib.parse import urlencode, parse_qsl
+
+from flask import Blueprint, render_template, redirect, session, request, \
+    flash, url_for
+from werkzeug.datastructures import ImmutableMultiDict
+
+from accounting.database import db
+from accounting.locale import lazy_gettext
+from accounting.models import Currency
+from accounting.utils.next_url import inherit_next, or_next
+from accounting.utils.pagination import Pagination
+from accounting.utils.permission import has_permission, can_view, can_edit
+from .forms import CurrencyForm
+
+bp: Blueprint = Blueprint("currency", __name__)
+"""The view blueprint for the currency management."""
+api_bp: Blueprint = Blueprint("currency-api", __name__)
+"""The view blueprint for the currency management API."""
+
+
+@bp.get("", endpoint="list")
+@has_permission(can_view)
+def list_currencies() -> str:
+    """Lists the currencies.
+
+    :return: The currency list.
+    """
+    from .query import get_currency_query
+    currencies: list[Currency] = get_currency_query()
+    pagination: Pagination = Pagination[Currency](currencies)
+    return render_template("accounting/currency/list.html",
+                           list=pagination.list, pagination=pagination)
+
+
+@bp.get("/create", endpoint="create")
+@has_permission(can_edit)
+def show_add_currency_form() -> str:
+    """Shows the form to add a currency.
+
+    :return: The form to add a currency.
+    """
+    if "form" in session:
+        form = CurrencyForm(ImmutableMultiDict(parse_qsl(session["form"])))
+        del session["form"]
+        form.validate()
+    else:
+        form = CurrencyForm()
+    return render_template("accounting/currency/create.html",
+                           form=form)
+
+
+@bp.post("/store", endpoint="store")
+@has_permission(can_edit)
+def add_currency() -> redirect:
+    """Adds a currency.
+
+    :return: The redirection to the currency detail on success, or the currency
+        creation form on error.
+    """
+    form = CurrencyForm(request.form)
+    if not form.validate():
+        for key in form.errors:
+            for error in form.errors[key]:
+                flash(error, "error")
+        session["form"] = urlencode(list(request.form.items()))
+        return redirect(inherit_next(url_for("accounting.currency.create")))
+    currency: Currency = Currency()
+    form.populate_obj(currency)
+    db.session.add(currency)
+    db.session.commit()
+    flash(lazy_gettext("The currency is added successfully"), "success")
+    return redirect(inherit_next(url_for("accounting.currency.detail",
+                                         currency=currency)))
+
+
+@bp.get("/<currency:currency>", endpoint="detail")
+@has_permission(can_view)
+def show_currency_detail(currency: Currency) -> str:
+    """Shows the currency detail.
+
+    :param currency: The currency.
+    :return: The detail.
+    """
+    return render_template("accounting/currency/detail.html", obj=currency)
+
+
+@bp.get("/<currency:currency>/edit", endpoint="edit")
+@has_permission(can_edit)
+def show_currency_edit_form(currency: Currency) -> str:
+    """Shows the form to edit a currency.
+
+    :param currency: The currency.
+    :return: The form to edit the currency.
+    """
+    form: CurrencyForm
+    if "form" in session:
+        form = CurrencyForm(ImmutableMultiDict(parse_qsl(session["form"])))
+        del session["form"]
+        form.validate()
+    else:
+        form = CurrencyForm(obj=currency)
+    return render_template("accounting/currency/edit.html",
+                           currency=currency, form=form)
+
+
+@bp.post("/<currency:currency>/update", endpoint="update")
+@has_permission(can_edit)
+def update_currency(currency: Currency) -> redirect:
+    """Updates a currency.
+
+    :param currency: The currency.
+    :return: The redirection to the currency detail on success, or the currency
+        edit form on error.
+    """
+    form = CurrencyForm(request.form)
+    form.obj_code = currency.code
+    if not form.validate():
+        for key in form.errors:
+            for error in form.errors[key]:
+                flash(error, "error")
+        session["form"] = urlencode(list(request.form.items()))
+        return redirect(inherit_next(url_for("accounting.currency.edit",
+                                             currency=currency)))
+    with db.session.no_autoflush:
+        form.populate_obj(currency)
+    if not currency.is_modified:
+        flash(lazy_gettext("The currency was not modified."), "success")
+        return redirect(inherit_next(url_for("accounting.currency.detail",
+                                             currency=currency)))
+    form.post_update(currency)
+    db.session.commit()
+    flash(lazy_gettext("The currency is updated successfully."), "success")
+    return redirect(inherit_next(url_for("accounting.currency.detail",
+                                         currency=currency)))
+
+
+@bp.post("/<currency:currency>/delete", endpoint="delete")
+@has_permission(can_edit)
+def delete_currency(currency: Currency) -> redirect:
+    """Deletes a currency.
+
+    :param currency: The currency.
+    :return: The redirection to the currency list on success, or the currency
+        detail on error.
+    """
+    currency.delete()
+    db.session.commit()
+    flash(lazy_gettext("The currency is deleted successfully."), "success")
+    return redirect(or_next(url_for("accounting.currency.list")))
+
+
+@api_bp.get("/exists-code", endpoint="exists")
+@has_permission(can_edit)
+def exists_code() -> dict[str, bool]:
+    """Validates whether a currency code exists.
+
+    :return: Whether the currency code exists.
+    """
+    return {"exists": db.session.get(Currency, request.args["q"]) is not None}

src/accounting/database.py

@@ -25,7 +25,7 @@ time.
 
 from flask_sqlalchemy import SQLAlchemy
 
-db: SQLAlchemy
+db: SQLAlchemy = SQLAlchemy()
 """The database instance."""
 
 

src/accounting/locale.py

@@ -39,6 +39,17 @@ def gettext(string, **variables) -> str:
     return domain.gettext(string, **variables)
 
 
+def pgettext(context, string, **variables) -> str:
+    """A replacement of the Babel gettext() function..
+
+    :param context: The context.
+    :param string: The message to translate.
+    :param variables: The variable substitution.
+    :return: The translated message.
+    """
+    return domain.pgettext(context, string, **variables)
+
+
 def lazy_gettext(string, **variables) -> LazyString:
     """A replacement of the Babel lazy_gettext() function..
 
@@ -105,8 +116,8 @@ def __babel_js_catalog_view() -> Response:
 def init_app(app: Flask, bp: Blueprint) -> None:
     """Initializes the application.
 
-    :param bp: The blueprint of the accounting application.
     :param app: The Flask application.
+    :param bp: The blueprint of the accounting application.
     :return: None.
     """
     bp.add_url_rule("/_jstrans.js", "babel_catalog",

src/accounting/models.py

@@ -64,6 +64,14 @@ class BaseAccount(db.Model):
                 return l10n.title
         return self.title_l10n
 
+    @property
+    def query_values(self) -> list[str]:
+        """Returns the values to be queried.
+
+        :return: The values to be queried.
+        """
+        return [self.code, self.title_l10n] + [x.title for x in self.l10n]
+
 
 class BaseAccountL10n(db.Model):
     """A localized base account title."""
@@ -187,16 +195,14 @@ class Account(db.Model):
             if l10n.locale == current_locale:
                 l10n.title = value
                 return
-        self.l10n.append(AccountL10n(
-            locale=current_locale, title=value))
+        self.l10n.append(AccountL10n(locale=current_locale, title=value))
 
     @classmethod
     def find_by_code(cls, code: str) -> t.Self | None:
-        """Finds an accounting account by its code.
+        """Finds an account by its code.
 
         :param code: The code.
-        :return: The accounting account, or None if this account does not
-            exist.
+        :return: The account, or None if this account does not exist.
         """
         m = re.match("^([1-9]{4})-([0-9]{3})$", code)
         if m is None:
@@ -293,8 +299,21 @@ class Account(db.Model):
         """
         return cls.find_by_code(cls.__NET_CHANGE)
 
+    @property
+    def is_modified(self) -> bool:
+        """Returns whether a product account was modified.
+
+        :return: True if modified, or False otherwise.
+        """
+        if db.session.is_modified(self):
+            return True
+        for l10n in self.l10n:
+            if db.session.is_modified(l10n):
+                return True
+        return False
+
     def delete(self) -> None:
-        """Deletes this accounting account.
+        """Deletes this account.
 
         :return: None.
         """
@@ -306,11 +325,128 @@ class Account(db.Model):
 class AccountL10n(db.Model):
     """A localized account title."""
     __tablename__ = "accounting_accounts_l10n"
+    """The table name."""
     account_id = db.Column(db.Integer,
                            db.ForeignKey(Account.id, onupdate="CASCADE",
                                          ondelete="CASCADE"),
                            nullable=False, primary_key=True)
+    """The account ID."""
     account = db.relationship(Account, back_populates="l10n")
+    """The account."""
     locale = db.Column(db.String, nullable=False, primary_key=True)
+    """The locale."""
     title = db.Column(db.String, nullable=False)
-    db.UniqueConstraint(account_id, locale)
+    """The localized title."""
+
+
+class Currency(db.Model):
+    """A currency."""
+    __tablename__ = "accounting_currencies"
+    """The table name."""
+    code = db.Column(db.String, nullable=False, primary_key=True)
+    """The code."""
+    name_l10n = db.Column("name", db.String, nullable=False)
+    """The name."""
+    created_at = db.Column(db.DateTime(timezone=True), nullable=False,
+                           server_default=db.func.now())
+    """The time of creation."""
+    created_by_id = db.Column(db.Integer,
+                              db.ForeignKey(user_pk_column,
+                                            onupdate="CASCADE"),
+                              nullable=False)
+    """The ID of the creator."""
+    created_by = db.relationship(user_cls, foreign_keys=created_by_id)
+    """The creator."""
+    updated_at = db.Column(db.DateTime(timezone=True), nullable=False,
+                           server_default=db.func.now())
+    """The time of last update."""
+    updated_by_id = db.Column(db.Integer,
+                              db.ForeignKey(user_pk_column,
+                                            onupdate="CASCADE"),
+                              nullable=False)
+    """The ID of the updator."""
+    updated_by = db.relationship(user_cls, foreign_keys=updated_by_id)
+    """The updator."""
+    l10n = db.relationship("CurrencyL10n", back_populates="currency",
+                           lazy=False)
+    """The localized names."""
+
+    def __str__(self) -> str:
+        """Returns the string representation of the currency.
+
+        :return: The string representation of the currency.
+        """
+        return F"{self.name} ({self.code})"
+
+    @property
+    def name(self) -> str:
+        """Returns the name in the current locale.
+
+        :return: The name in the current locale.
+        """
+        current_locale = str(get_locale())
+        if current_locale == current_app.config["BABEL_DEFAULT_LOCALE"]:
+            return self.name_l10n
+        for l10n in self.l10n:
+            if l10n.locale == current_locale:
+                return l10n.name
+        return self.name_l10n
+
+    @name.setter
+    def name(self, value: str) -> None:
+        """Sets the name in the current locale.
+
+        :param value: The new name.
+        :return: None.
+        """
+        if self.name_l10n is None:
+            self.name_l10n = value
+            return
+        current_locale = str(get_locale())
+        if current_locale == current_app.config["BABEL_DEFAULT_LOCALE"]:
+            self.name_l10n = value
+            return
+        for l10n in self.l10n:
+            if l10n.locale == current_locale:
+                l10n.name = value
+                return
+        self.l10n.append(CurrencyL10n(locale=current_locale, name=value))
+
+    @property
+    def is_modified(self) -> bool:
+        """Returns whether a product account was modified.
+
+        :return: True if modified, or False otherwise.
+        """
+        if db.session.is_modified(self):
+            return True
+        for l10n in self.l10n:
+            if db.session.is_modified(l10n):
+                return True
+        return False
+
+    def delete(self) -> None:
+        """Deletes the currency.
+
+        :return: None.
+        """
+        CurrencyL10n.query.filter(CurrencyL10n.currency == self).delete()
+        cls: t.Type[t.Self] = self.__class__
+        cls.query.filter(cls.code == self.code).delete()
+
+
+class CurrencyL10n(db.Model):
+    """A localized currency name."""
+    __tablename__ = "accounting_currencies_l10n"
+    """The table name."""
+    currency_code = db.Column(db.String,
+                              db.ForeignKey(Currency.code, onupdate="CASCADE",
+                                            ondelete="CASCADE"),
+                              nullable=False, primary_key=True)
+    """The currency code."""
+    currency = db.relationship(Currency, back_populates="l10n")
+    """The currency."""
+    locale = db.Column(db.String, nullable=False, primary_key=True)
+    """The locale."""
+    name = db.Column(db.String, nullable=False)
+    """The localized name."""

src/accounting/static/css/style.css

@@ -21,48 +21,50 @@
  * First written: 2023/2/1
  */
 
-.clickable {
+.accounting-clickable {
     cursor: pointer;
 }
-.btn-group .btn .search-input {
+.btn-group .btn .accounting-search-input {
     min-height: calc(1em + .5rem + 2px);
     padding: 0 0.5rem;
 }
-.btn-group .btn .search-label button {
+.btn-group .btn .accounting-search-label button {
     border: none;
     background-color: transparent;
     color: inherit;
     padding-right: 0;
 }
 
-/** The account management */
-.account {
+/** The card layout */
+.accounting-card {
     padding: 2em 1.5em;
     margin: 1em;
     background-color: #E9ECEF;
     border-radius: 0.3em;
     box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
 }
-.account .account-title {
+.accounting-card-title {
     font-size: 1.8rem;
     font-weight: bolder;
 }
-.account .account-code {
+.accounting-card-code {
     font-size: 1.4rem;
     color: #373b3e;
 }
-.list-base-selector {
+
+/** The option selector */
+.accounting-selector-list {
     height: 20rem;
     overflow-y: scroll;
 }
 
 /* The Material Design text field (floating form control in Bootstrap) */
-.material-text-field {
+.accounting-material-text-field {
     position: relative;
     min-height: calc(3.5rem + 2px);
     padding-top: 1.625rem;
 }
-.material-text-field > .form-label {
+.accounting-material-text-field > .form-label {
     position: absolute;
     top: 0;
     left: 0;
@@ -71,27 +73,27 @@
     transform-origin: 0 0;
     transition: opacity .1s ease-in-out,transform .1s ease-in-out;
 }
-.material-text-field.not-empty > .form-label {
+.accounting-material-text-field.accounting-not-empty > .form-label {
     opacity: 0.65;
     transform: scale(.85) translateY(-.5rem) translateX(.15rem);
 }
 
 /* The Material Design floating action buttons */
-.material-fab {
+.accounting-material-fab {
     position: fixed;
     right: 2rem;
     bottom: 1rem;
     z-index: 10;
     flex-direction: column-reverse;
 }
-.material-fab .btn {
+.accounting-material-fab .btn {
     border-radius: 50%;
     transform: scale(1.5);
     box-shadow: 0 3px 5px -1px rgba(0, 0, 0, 0.2), 0 6px 10px 0 rgba(0, 0, 0, 0.14), 0 1px 18px 0 rgba(0,0,0,.12);
     display: block;
     margin-top: 2.5rem;
 }
-.material-fab .btn:hover, .material-fab .btn:focus {
+.accounting-material-fab .btn:hover, .accounting-material-fab .btn:focus {
     box-shadow: 0 5px 5px -3px rgba(0, 0, 0, 0.2), 0 8px 10px 1px rgba(0, 0, 0, 0.14), 0 3px 14px 2px rgba(0,0,0,.12);
 }
 

src/accounting/static/js/account-form.js

@@ -24,11 +24,11 @@
 // Initializes the page JavaScript.
 document.addEventListener("DOMContentLoaded", function () {
     initializeBaseAccountSelector();
-    document.getElementById("account-base-code")
+    document.getElementById("accounting-base-code")
         .onchange = validateBase;
-    document.getElementById("account-title")
+    document.getElementById("accounting-title")
         .onchange = validateTitle;
-    document.getElementById("account-form")
+    document.getElementById("accounting-form")
         .onsubmit = validateForm;
 });
 
@@ -38,25 +38,25 @@ document.addEventListener("DOMContentLoaded", function () {
  * @private
  */
 function initializeBaseAccountSelector() {
-    const selector = document.getElementById("select-base-modal");
-    const base = document.getElementById("account-base");
-    const baseCode = document.getElementById("account-base-code");
-    const baseContent = document.getElementById("account-base-content");
-    const options = Array.from(document.getElementsByClassName("list-group-item-base"));
-    const btnClear = document.getElementById("btn-clear-base");
+    const selector = document.getElementById("accounting-base-selector-model");
+    const base = document.getElementById("accounting-base");
+    const baseCode = document.getElementById("accounting-base-code");
+    const baseContent = document.getElementById("accounting-base-content");
+    const options = Array.from(document.getElementsByClassName("accounting-base-option"));
+    const btnClear = document.getElementById("accounting-btn-clear-base");
     selector.addEventListener("show.bs.modal", function () {
-        base.classList.add("not-empty");
+        base.classList.add("accounting-not-empty");
         options.forEach(function (item) {
             item.classList.remove("active");
         });
-        const selected = document.getElementById("list-group-item-base-" + baseCode.value);
+        const selected = document.getElementById("accounting-base-option-" + baseCode.value);
         if (selected !== null) {
             selected.classList.add("active");
         }
     });
     selector.addEventListener("hidden.bs.modal", function () {
         if (baseCode.value === "") {
-            base.classList.remove("not-empty");
+            base.classList.remove("accounting-not-empty");
         }
     });
     options.forEach(function (option) {
@@ -79,6 +79,54 @@ function initializeBaseAccountSelector() {
         validateBase();
         bootstrap.Modal.getInstance(selector).hide();
     }
+    initializeBaseAccountQuery();
+}
+
+/**
+ * Initializes the query on the base account options.
+ *
+ * @private
+ */
+function initializeBaseAccountQuery() {
+    const query = document.getElementById("accounting-base-selector-query");
+    const optionList = document.getElementById("accounting-base-option-list");
+    const options = Array.from(document.getElementsByClassName("accounting-base-option"));
+    const queryNoResult = document.getElementById("accounting-base-option-no-result");
+    query.addEventListener("input", function () {
+        console.log(query.value);
+        if (query.value === "") {
+            options.forEach(function (option) {
+                option.classList.remove("d-none");
+            });
+            optionList.classList.remove("d-none");
+            queryNoResult.classList.add("d-none");
+            return
+        }
+        let hasAnyMatched = false;
+        options.forEach(function (option) {
+            const queryValues = JSON.parse(option.dataset.queryValues);
+            let isMatched = false;
+            for (let i = 0; i < queryValues.length; i++) {
+                if (queryValues[i].includes(query.value)) {
+                    isMatched = true;
+                    break;
+                }
+            }
+            if (isMatched) {
+                option.classList.remove("d-none");
+                hasAnyMatched = true;
+            } else {
+                option.classList.add("d-none");
+            }
+        });
+        if (!hasAnyMatched) {
+            optionList.classList.add("d-none");
+            queryNoResult.classList.remove("d-none");
+        } else {
+            optionList.classList.remove("d-none");
+            queryNoResult.classList.add("d-none");
+        }
+    });
 }
 
 /**
@@ -101,9 +149,9 @@ function validateForm() {
  * @private
  */
 function validateBase() {
-    const field = document.getElementById("account-base-code");
-    const error = document.getElementById("account-base-code-error");
-    const displayField = document.getElementById("account-base");
+    const field = document.getElementById("accounting-base-code");
+    const error = document.getElementById("accounting-base-code-error");
+    const displayField = document.getElementById("accounting-base");
     field.value = field.value.trim();
     if (field.value === "") {
         displayField.classList.add("is-invalid");
@@ -122,8 +170,8 @@ function validateBase() {
  * @private
  */
 function validateTitle() {
-    const field = document.getElementById("account-title");
-    const error = document.getElementById("account-title-error");
+    const field = document.getElementById("accounting-title");
+    const error = document.getElementById("accounting-title-error");
     field.value = field.value.trim();
     if (field.value === "") {
         field.classList.add("is-invalid");

src/accounting/static/js/account-order.js

@@ -23,13 +23,13 @@
 
 // Initializes the page JavaScript.
 document.addEventListener("DOMContentLoaded", function () {
-    const list = document.getElementById("account-order-list");
+    const list = document.getElementById("accounting-order-list");
     if (list !== null) {
         const onReorder = function () {
             const accounts = Array.from(list.children);
             for (let i = 0; i < accounts.length; i++) {
-                const no = document.getElementById("account-order-" + accounts[i].dataset.id + "-no");
-                const code = document.getElementById("account-order-" + accounts[i].dataset.id + "-code");
+                const no = document.getElementById("accounting-order-" + accounts[i].dataset.id + "-no");
+                const code = document.getElementById("accounting-order-" + accounts[i].dataset.id + "-code");
                 no.value = String(i + 1);
                 code.innerText = list.dataset.baseCode + "-" + ("000" + (i + 1)).slice(-3);
             }

src/accounting/static/js/currency-form.js

@@ -0,0 +1,174 @@
+/* The Mia! Accounting Flask Project
+ * currency-form.js: The JavaScript for the currency form
+ */
+
+/*  Copyright (c) 2023 imacat.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+/* Author: imacat@mail.imacat.idv.tw (imacat)
+ * First written: 2023/2/6
+ */
+
+// Initializes the page JavaScript.
+document.addEventListener("DOMContentLoaded", function () {
+    document.getElementById("accounting-code")
+        .onchange = validateCode;
+    document.getElementById("accounting-name")
+        .onchange = validateName;
+    document.getElementById("accounting-form")
+        .onsubmit = validateForm;
+});
+
+/**
+ * The asynchronous validation result
+ * @type {object}
+ * @private
+ */
+let isAsyncValid = {};
+
+/**
+ * Validates the form.
+ *
+ * @returns {boolean} true if valid, or false otherwise
+ * @private
+ */
+function validateForm() {
+    isAsyncValid = {
+        "code": false,
+        "_sync": false,
+    };
+    let isValid = true;
+    isValid = validateCode() && isValid;
+    isValid = validateName() && isValid;
+    isAsyncValid["_sync"] = isValid;
+    submitFormIfAllAsyncValid();
+    return false;
+}
+
+/**
+ * Submits the form if the whole form passed the asynchronous
+ * validations.
+ *
+ * @private
+ */
+function submitFormIfAllAsyncValid() {
+    let isValid = true;
+    Object.keys(isAsyncValid).forEach(function (key) {
+        isValid = isAsyncValid[key] && isValid;
+    });
+    if (isValid) {
+        document.getElementById("accounting-form").submit()
+    }
+}
+
+/**
+ * Validates the code.
+ *
+ * @param changeEvent {Event} the change event, if invoked from onchange
+ * @returns {boolean} true if valid, or false otherwise
+ * @private
+ */
+function validateCode(changeEvent = null) {
+    const key = "code";
+    const isSubmission = changeEvent === null;
+    let hasAsyncValidation = false;
+    const field = document.getElementById("accounting-code");
+    const error = document.getElementById("accounting-code-error");
+    field.value = field.value.trim();
+    if (field.value === "") {
+        field.classList.add("is-invalid");
+        error.innerText = A_("Please fill in the code.");
+        return false;
+    }
+    const blocklist = JSON.parse(field.dataset.blocklist);
+    if (blocklist.includes(field.value)) {
+        field.classList.add("is-invalid");
+        error.innerText = A_("This code is not available.");
+        return false;
+    }
+    if (!field.value.match(/^[A-Z]{3}$/)) {
+        field.classList.add("is-invalid");
+        error.innerText = A_("Code can only be composed of 3 upper-cased letters.");
+        return false;
+    }
+    const original = field.dataset.original;
+    if (original === "" || field.value !== original) {
+        hasAsyncValidation = true;
+        validateAsyncCodeIsDuplicated(isSubmission, key);
+    }
+    if (!hasAsyncValidation) {
+        isAsyncValid[key] = true;
+        field.classList.remove("is-invalid");
+        error.innerText = "";
+    }
+    return true;
+}
+
+/**
+ * Validates asynchronously whether the code is duplicated.
+ * The boolean validation result is stored in isAsyncValid[key].
+ *
+ * @param isSubmission {boolean} whether this is invoked from a form submission
+ * @param key {string} the key to store the result in isAsyncValid
+ * @private
+ */
+function validateAsyncCodeIsDuplicated(isSubmission, key) {
+    const field = document.getElementById("accounting-code");
+    const error = document.getElementById("accounting-code-error");
+    const url = field.dataset.existsUrl;
+    const onLoad = function () {
+        if (this.status === 200) {
+            const result = JSON.parse(this.responseText);
+            if (result["exists"]) {
+                field.classList.add("is-invalid");
+                error.innerText = A_("Code conflicts with another currency.");
+                if (isSubmission) {
+                    isAsyncValid[key] = false;
+                }
+                return;
+            }
+            field.classList.remove("is-invalid");
+            error.innerText = "";
+            if (isSubmission) {
+                isAsyncValid[key] = true;
+                submitFormIfAllAsyncValid();
+            }
+        }
+    };
+    const request = new XMLHttpRequest();
+    request.onload = onLoad;
+    request.open("GET", url + "?q=" + encodeURIComponent(field.value));
+    request.send();
+}
+
+/**
+ * Validates the name.
+ *
+ * @returns {boolean} true if valid, or false otherwise
+ * @private
+ */
+function validateName() {
+    const field = document.getElementById("accounting-name");
+    const error = document.getElementById("accounting-name-error");
+    field.value = field.value.trim();
+    if (field.value === "") {
+        field.classList.add("is-invalid");
+        error.innerText = A_("Please fill in the name.");
+        return false;
+    }
+    field.classList.remove("is-invalid");
+    error.innerText = "";
+    return true;
+}

src/accounting/templates/accounting/account/detail.html

@@ -26,47 +26,47 @@ First written: 2023/1/31
 {% block content %}
 
 <div class="btn-group mb-3">
-  <a class="btn btn-primary" href="{{ url_for("accounting.account.list")|or_next }}">
+  <a class="btn btn-primary" href="{{ url_for("accounting.account.list")|accounting_or_next }}">
     <i class="fa-solid fa-circle-chevron-left"></i>
     {{ A_("Back") }}
   </a>
-  {% if can_edit_accounting() %}
-    <a class="btn btn-primary d-none d-md-inline" href="{{ url_for("accounting.account.edit", account=obj)|inherit_next }}">
+  {% if accounting_can_edit() %}
+    <a class="btn btn-primary d-none d-md-inline" href="{{ url_for("accounting.account.edit", account=obj)|accounting_inherit_next }}">
       <i class="fa-solid fa-gear"></i>
       {{ A_("Settings") }}
     </a>
   {% endif %}
-  <a class="btn btn-primary" href="{{ url_for("accounting.account.order", base=obj.base)|append_next }}">
+  <a class="btn btn-primary" href="{{ url_for("accounting.account.order", base=obj.base)|accounting_append_next }}">
     <i class="fa-solid fa-bars-staggered"></i>
     {{ A_("Order") }}
   </a>
-  {% if can_edit_accounting() %}
-    <button class="btn btn-danger" type="button" data-bs-toggle="modal" data-bs-target="#delete-modal">
+  {% if accounting_can_edit() %}
+    <button class="btn btn-danger" type="button" data-bs-toggle="modal" data-bs-target="#accounting-delete-modal">
       <i class="fa-solid fa-trash"></i>
       {{ A_("Delete") }}
     </button>
   {% endif %}
 </div>
 
-{% if can_edit_accounting() %}
-  <div class="d-md-none material-fab">
-    <a class="btn btn-primary" href="{{ url_for("accounting.account.edit", account=obj)|inherit_next }}">
+{% if accounting_can_edit() %}
+  <div class="d-md-none accounting-material-fab">
+    <a class="btn btn-primary" href="{{ url_for("accounting.account.edit", account=obj)|accounting_inherit_next }}">
       <i class="fa-solid fa-pen-to-square"></i>
     </a>
   </div>
 {% endif %}
 
-{% if can_edit_accounting() %}
-  <form id="delete-form" action="{{ url_for("accounting.account.delete", account=obj) }}" method="post">
-    <input id="csrf_token" type="hidden" name="csrf_token" value="{{ csrf_token() }}">
+{% if accounting_can_edit() %}
+  <form action="{{ url_for("accounting.account.delete", account=obj) }}" method="post">
+    <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
     {% if "next" in request.args %}
       <input type="hidden" name="next" value="{{ request.args["next"] }}">
     {% endif %}
-    <div class="modal fade" id="delete-modal" tabindex="-1" aria-labelledby="delete-model-label" aria-hidden="true">
+    <div class="modal fade" id="accounting-delete-modal" tabindex="-1" aria-labelledby="accounting-delete-model-label" aria-hidden="true">
       <div class="modal-dialog">
         <div class="modal-content">
           <div class="modal-header">
-            <h1 class="modal-title fs-5" id="delete-model-label">{{ A_("Delete Account Confirmation") }}</h1>
+            <h1 class="modal-title fs-5" id="accounting-delete-model-label">{{ A_("Delete Account Confirmation") }}</h1>
             <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
           </div>
           <div class="modal-body">
@@ -82,9 +82,9 @@ First written: 2023/1/31
   </form>
 {% endif %}
 
-<div class="account col-sm-6">
-  <div class="account-title">{{ obj.title }}</div>
-  <div class="account-code">{{ obj.code }}</div>
+<div class="accounting-card col-sm-6">
+  <div class="accounting-card-title">{{ obj.title }}</div>
+  <div class="accounting-card-code">{{ obj.code }}</div>
   {% if obj.is_offset_needed %}
     <div>
       <span class="badge rounded-pill bg-info">{{ A_("Offset needed") }}</span>

src/accounting/templates/accounting/account/edit.html

@@ -23,6 +23,6 @@ First written: 2023/2/1
 
 {% block header %}{% block title %}{{ A_("%(account)s Settings", account=account) }}{% endblock %}{% endblock %}
 
-{% block back_url %}{{ url_for("accounting.account.detail", account=account)|inherit_next }}{% endblock %}
+{% block back_url %}{{ url_for("accounting.account.detail", account=account)|accounting_inherit_next }}{% endblock %}
 
 {% block action_url %}{{ url_for("accounting.account.update", account=account) }}{% endblock %}

src/accounting/templates/accounting/account/include/form.html

@@ -34,16 +34,16 @@ First written: 2023/2/1
   </a>
 </div>
 
-<form id="account-form" action="{% block action_url %}{% endblock %}" method="post">
+<form id="accounting-form" action="{% block action_url %}{% endblock %}" method="post">
   {{ form.csrf_token }}
   {% if "next" in request.args %}
     <input type="hidden" name="next" value="{{ request.args["next"] }}">
   {% endif %}
   <div class="form-floating mb-3">
-    <input id="account-base-code" type="hidden" name="base_code" value="{{ "" if form.base_code.data is none else form.base_code.data }}">
-    <div id="account-base" class="form-control clickable material-text-field {% if form.base_code.data %} not-empty {% endif %} {% if form.base_code.errors %} is-invalid {% endif %}" data-bs-toggle="modal" data-bs-target="#select-base-modal">
-      <label id="account-base-label" class="form-label" for="account-base">{{ A_("Base account") }}</label>
-      <div id="account-base-content">
+    <input id="accounting-base-code" type="hidden" name="base_code" value="{{ "" if form.base_code.data is none else form.base_code.data }}">
+    <div id="accounting-base" class="form-control accounting-clickable accounting-material-text-field {% if form.base_code.data %} accounting-not-empty {% endif %} {% if form.base_code.errors %} is-invalid {% endif %}" data-bs-toggle="modal" data-bs-target="#accounting-base-selector-model">
+      <label class="form-label" for="accounting-base">{{ A_("Base account") }}</label>
+      <div id="accounting-base-content">
         {% if form.base_code.data %}
           {% if form.base_code.errors %}
             {{ A_("(Unknown)") }}
@@ -53,18 +53,18 @@ First written: 2023/2/1
         {% endif %}
       </div>
     </div>
-    <div id="account-base-code-error" class="invalid-feedback">{% if form.base_code.errors %}{{ form.base_code.errors[0] }}{% endif %}</div>
+    <div id="accounting-base-code-error" class="invalid-feedback">{% if form.base_code.errors %}{{ form.base_code.errors[0] }}{% endif %}</div>
   </div>
 
   <div class="form-floating mb-3">
-    <input id="account-title" class="form-control {% if form.title.errors %} is-invalid {% endif %}" type="text" name="title" value="{{ "" if form.title.data is none else form.title.data }}" placeholder=" " required="required">
-    <label class="form-label" for="account-title">{{ A_("Title") }}</label>
-    <div id="account-title-error" class="invalid-feedback">{% if form.title.errors %}{{ form.title.errors[0] }}{% endif %}</div>
+    <input id="accounting-title" class="form-control {% if form.title.errors %} is-invalid {% endif %}" type="text" name="title" value="{{ "" if form.title.data is none else form.title.data }}" placeholder=" " required="required">
+    <label class="form-label" for="accounting-title">{{ A_("Title") }}</label>
+    <div id="accounting-title-error" class="invalid-feedback">{% if form.title.errors %}{{ form.title.errors[0] }}{% endif %}</div>
   </div>
 
   <div class="form-check form-switch mb-3">
-    <input id="account-is-offset-needed" class="form-check-input" type="checkbox" name="is_offset_needed" value="1" {% if form.is_offset_needed.data %} checked="checked" {% endif %}>
-    <label class="form-check-label" for="account-is-offset-needed">
+    <input id="accounting-is-offset-needed" class="form-check-input" type="checkbox" name="is_offset_needed" value="1" {% if form.is_offset_needed.data %} checked="checked" {% endif %}>
+    <label class="form-check-label" for="accounting-is-offset-needed">
       {{ A_("The entries in the account need offsets.") }}
     </label>
   </div>
@@ -76,43 +76,44 @@ First written: 2023/2/1
     </button>
   </div>
 
-  <div class="d-md-none material-fab">
+  <div class="d-md-none accounting-material-fab">
     <button class="btn btn-primary" type="submit">
       <i class="fa-solid fa-floppy-disk"></i>
     </button>
   </div>
 </form>
 
-<div class="modal fade" id="select-base-modal" tabindex="-1" aria-labelledby="select-base-model-label" aria-hidden="true">
+<div class="modal fade" id="accounting-base-selector-model" tabindex="-1" aria-labelledby="accounting-base-selector-model-label" aria-hidden="true">
   <div class="modal-dialog">
     <div class="modal-content">
       <div class="modal-header">
-        <h1 class="modal-title fs-5" id="base-selector-model-label">{{ A_("Select Base Account") }}</h1>
+        <h1 class="modal-title fs-5" id="accounting-base-selector-model-label">{{ A_("Select Base Account") }}</h1>
         <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
       </div>
       <div class="modal-body">
         <div class="input-group mb-2">
-          <input id="select-base-query" class="form-control form-control-sm" type="search" placeholder=" " required="required" aria-label="Search">
-          <label class="input-group-text" for="select-base-query">
+          <input id="accounting-base-selector-query" class="form-control form-control-sm" type="search" placeholder=" " required="required" aria-label="Search">
+          <label class="input-group-text" for="accounting-base-selector-query">
             <i class="fa-solid fa-magnifying-glass"></i>
             {{ A_("Search") }}
           </label>
         </div>
 
-        <ul class="list-group list-base-selector">
+        <ul id="accounting-base-option-list" class="list-group accounting-selector-list">
           {% for base in form.base_options %}
-          <li id="list-group-item-base-{{ base.code }}" class="list-group-item list-group-item-base clickable" data-code="{{ base.code }}" data-content="{{ base }}">
+          <li id="accounting-base-option-{{ base.code }}" class="list-group-item accounting-base-option accounting-clickable" data-code="{{ base.code }}" data-content="{{ base }}" data-query-values="{{ base.query_values|tojson|forceescape }}">
             {{ base }}
           </li>
           {% endfor %}
         </ul>
+        <p id="accounting-base-option-no-result" class="d-none">{{ A_("There is no data.") }}</p>
       </div>
       <div class="modal-footer">
         <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">{{ A_("Cancel") }}</button>
         {% if form.base_code.data %}
-          <button id="btn-clear-base" type="button" class="btn btn-danger">{{ A_("Clear") }}</button>
+          <button id="accounting-btn-clear-base" type="button" class="btn btn-danger">{{ A_("Clear") }}</button>
         {% else %}
-          <button id="btn-clear-base" type="button" class="btn btn-secondary" disabled="disabled">{{ A_("Clear") }}</button>
+          <button id="accounting-btn-clear-base" type="button" class="btn btn-secondary" disabled="disabled">{{ A_("Clear") }}</button>
         {% endif %}
       </div>
     </div>

src/accounting/templates/accounting/account/list.html

@@ -21,20 +21,20 @@ First written: 2023/1/30
 #}
 {% extends "accounting/base.html" %}
 
-{% block header %}{% block title %}{{ A_("Account Management") }}{% endblock %}{% endblock %}
+{% block header %}{% block title %}{% if "q" in request.args %}{{ A_("Search Result for \"%(query)s\"", query=request.args["q"]) }}{% else %}{{ A_("Account Management") }}{% endif %}{% endblock %}{% endblock %}
 
 {% block content %}
 
 <div class="btn-group mb-2">
-  {% if can_edit_accounting() %}
-    <a class="btn btn-primary text-nowrap d-none d-md-block" href="{{ url_for("accounting.account.create")|append_next }}">
-      <i class="fa-solid fa-user-plus"></i>
+  {% if accounting_can_edit() %}
+    <a class="btn btn-primary text-nowrap d-none d-md-block" href="{{ url_for("accounting.account.create")|accounting_append_next }}">
+      <i class="fa-solid fa-plus"></i>
       {{ A_("New") }}
     </a>
   {% endif %}
   <form class="btn btn-primary d-flex input-group" action="{{ url_for("accounting.account.list") }}" method="get" role="search">
-    <input id="search-input" class="form-control form-control-sm search-input" type="search" name="q" value="{{ request.args["q"] if "q" in request.args else "" }}" placeholder=" " required="required" aria-label="Search">
-    <label for="search-input" class="search-label">
+    <input id="accounting-search" class="form-control form-control-sm accounting-search-input" type="search" name="q" value="{{ request.args["q"] if "q" in request.args else "" }}" placeholder=" " required="required" aria-label="Search">
+    <label for="accounting-search" class="accounting-search-label">
       <button type="submit">
         <i class="fa-solid fa-magnifying-glass"></i>
         {{ A_("Search") }}
@@ -43,9 +43,9 @@ First written: 2023/1/30
   </form>
 </div>
 
-{% if can_edit_accounting() %}
-  <div class="d-md-none material-fab">
-    <a class="btn btn-primary" href="{{ url_for("accounting.account.create")|append_next }}">
+{% if accounting_can_edit() %}
+  <div class="d-md-none accounting-material-fab">
+    <a class="btn btn-primary" href="{{ url_for("accounting.account.create")|accounting_append_next }}">
       <i class="fa-solid fa-plus"></i>
     </a>
   </div>
@@ -56,7 +56,7 @@ First written: 2023/1/30
 
   <div class="list-group">
   {% for item in list %}
-    <a class="list-group-item list-group-item-action" href="{{ url_for("accounting.account.detail", account=item)|append_next }}">
+    <a class="list-group-item list-group-item-action" href="{{ url_for("accounting.account.detail", account=item)|accounting_append_next }}">
       {{ item }}
       {% if item.is_offset_needed %}
         <span class="badge rounded-pill bg-info">{{ A_("Offset needed") }}</span>

src/accounting/templates/accounting/account/order.html

@@ -31,24 +31,24 @@ First written: 2023/2/2
 {% block content %}
 
 <div class="btn-group mb-3">
-  <a class="btn btn-primary" href="{{ url_for("accounting.account.list")|or_next }}">
+  <a class="btn btn-primary" href="{{ url_for("accounting.account.list")|accounting_or_next }}">
     <i class="fa-solid fa-circle-chevron-left"></i>
     {{ A_("Back") }}
   </a>
 </div>
 
-{% if base.accounts|length > 1 and can_edit_accounting() %}
+{% if base.accounts|length > 1 and accounting_can_edit() %}
   <form action="{{ url_for("accounting.account.sort", base=base) }}" method="post">
-    <input id="csrf_token" type="hidden" name="csrf_token" value="{{ csrf_token() }}">
+    <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
     {% if "next" in request.args %}
       <input type="hidden" name="next" value="{{ request.args["next"] }}">
     {% endif %}
-    <ul id="account-order-list" class="list-group mb-3" data-base-code="{{ base.code }}">
+    <ul id="accounting-order-list" class="list-group mb-3" data-base-code="{{ base.code }}">
       {% for account in base.accounts|sort(attribute="no") %}
         <li class="list-group-item d-flex justify-content-between" data-id="{{ account.id }}">
-          <input id="account-order-{{ account.id }}-no" type="hidden" name="{{ account.id }}-no" value="{{ loop.index }}">
+          <input id="accounting-order-{{ account.id }}-no" type="hidden" name="{{ account.id }}-no" value="{{ loop.index }}">
           <div>
-            <span id="account-order-{{ account.id }}-code">{{ account.code }}</span>
+            <span id="accounting-order-{{ account.id }}-code">{{ account.code }}</span>
             {{ account.title }}
           </div>
           <i class="fa-solid fa-bars"></i>
@@ -63,7 +63,7 @@ First written: 2023/2/2
       </button>
     </div>
 
-    <div class="d-md-none material-fab">
+    <div class="d-md-none accounting-material-fab">
       <button class="btn btn-primary" type="submit">
         <i class="fa-solid fa-floppy-disk"></i>
       </button>

src/accounting/templates/accounting/base-account/detail.html

@@ -26,19 +26,19 @@ First written: 2023/2/1
 {% block content %}
 
 <div class="btn-group mb-3">
-  <a class="btn btn-primary" href="{{ url_for("accounting.account.list")|or_next }}">
+  <a class="btn btn-primary" href="{{ url_for("accounting.account.list")|accounting_or_next }}">
     <i class="fa-solid fa-circle-chevron-left"></i>
     {{ A_("Back") }}
   </a>
 </div>
 
-<div class="account col-sm-6">
-  <div class="account-title">{{ obj.title }}</div>
-  <div class="account-code">{{ obj.code }}</div>
+<div class="accounting-card col-sm-6">
+  <div class="accounting-card-title">{{ obj.title }}</div>
+  <div class="accounting-card-code">{{ obj.code }}</div>
   {% if obj.accounts %}
     <div>
     {% for account in obj.accounts %}
-      <a class="btn btn-primary" href="{{ url_for("accounting.account.detail", account=account)|append_next }}">
+      <a class="btn btn-primary" href="{{ url_for("accounting.account.detail", account=account)|accounting_append_next }}">
         {{ account }}
       </a>
     {% endfor %}

src/accounting/templates/accounting/base-account/list.html

@@ -21,14 +21,14 @@ First written: 2023/1/26
 #}
 {% extends "accounting/base.html" %}
 
-{% block header %}{% block title %}{{ A_("Base Account Managements") }}{% endblock %}{% endblock %}
+{% block header %}{% block title %}{% if "q" in request.args %}{{ A_("Search Result for \"%(query)s\"", query=request.args["q"]) }}{% else %}{{ A_("Base Account Managements") }}{% endif %}{% endblock %}{% endblock %}
 
 {% block content %}
 
 <div class="btn-group mb-2">
   <form class="btn btn-primary d-flex input-group" action="{{ url_for("accounting.base-account.list") }}" method="get" role="search">
-    <input id="search-input" class="form-control form-control-sm search-input" type="search" name="q" value="{{ request.args["q"] if "q" in request.args else "" }}" placeholder=" " required="required" aria-label="Search">
-    <label for="search-input" class="search-label">
+    <input id="accounting-search" class="form-control form-control-sm accounting-search-input" type="search" name="q" value="{{ request.args["q"] if "q" in request.args else "" }}" placeholder=" " required="required" aria-label="Search">
+    <label for="accounting-search" class="accounting-search-label">
       <button type="submit">
         <i class="fa-solid fa-magnifying-glass"></i>
         {{ A_("Search") }}
@@ -42,7 +42,7 @@ First written: 2023/1/26
 
   <div class="list-group">
     {% for item in list %}
-      <a class="list-group-item list-group-item-action" href="{{ url_for("accounting.base-account.detail", account=item)|append_next }}">
+      <a class="list-group-item list-group-item-action" href="{{ url_for("accounting.base-account.detail", account=item)|accounting_append_next }}">
         {{ item }}
       </a>
     {% endfor %}

src/accounting/templates/accounting/currency/create.html

@@ -0,0 +1,28 @@
+{#
+The Mia! Accounting Flask Project
+create.html: The currency creation form
+
+ Copyright (c) 2023 imacat.
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+Author: imacat@mail.imacat.idv.tw (imacat)
+First written: 2023/2/6
+#}
+{% extends "accounting/currency/include/form.html" %}
+
+{% block header %}{% block title %}{{ A_("Add a New Currency") }}{% endblock %}{% endblock %}
+
+{% block back_url %}{{ request.args.get("next") or url_for("accounting.currency.list") }}{% endblock %}
+
+{% block action_url %}{{ url_for("accounting.currency.store") }}{% endblock %}

src/accounting/templates/accounting/currency/detail.html

@@ -0,0 +1,90 @@
+{#
+The Mia! Accounting Flask Project
+detail.html: The currency detail
+
+ Copyright (c) 2023 imacat.
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+Author: imacat@mail.imacat.idv.tw (imacat)
+First written: 2023/2/6
+#}
+{% extends "accounting/base.html" %}
+
+{% block header %}{% block title %}{{ obj }}{% endblock %}{% endblock %}
+
+{% block content %}
+
+<div class="btn-group mb-3">
+  <a class="btn btn-primary" href="{{ url_for("accounting.currency.list")|accounting_or_next }}">
+    <i class="fa-solid fa-circle-chevron-left"></i>
+    {{ A_("Back") }}
+  </a>
+  {% if accounting_can_edit() %}
+    <a class="btn btn-primary d-none d-md-inline" href="{{ url_for("accounting.currency.edit", currency=obj)|accounting_inherit_next }}">
+      <i class="fa-solid fa-gear"></i>
+      {{ A_("Settings") }}
+    </a>
+  {% endif %}
+  {% if accounting_can_edit() %}
+    <button class="btn btn-danger" type="button" data-bs-toggle="modal" data-bs-target="#accounting-delete-modal">
+      <i class="fa-solid fa-trash"></i>
+      {{ A_("Delete") }}
+    </button>
+  {% endif %}
+</div>
+
+{% if accounting_can_edit() %}
+  <div class="d-md-none accounting-material-fab">
+    <a class="btn btn-primary" href="{{ url_for("accounting.currency.edit", currency=obj)|accounting_inherit_next }}">
+      <i class="fa-solid fa-pen-to-square"></i>
+    </a>
+  </div>
+{% endif %}
+
+{% if accounting_can_edit() %}
+  <form action="{{ url_for("accounting.currency.delete", currency=obj) }}" method="post">
+    <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
+    {% if "next" in request.args %}
+      <input type="hidden" name="next" value="{{ request.args["next"] }}">
+    {% endif %}
+    <div class="modal fade" id="accounting-delete-modal" tabindex="-1" aria-labelledby="accounting-delete-model-label" aria-hidden="true">
+      <div class="modal-dialog">
+        <div class="modal-content">
+          <div class="modal-header">
+            <h1 class="modal-title fs-5" id="accounting-delete-model-label">{{ A_("Delete Currency Confirmation") }}</h1>
+            <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
+          </div>
+          <div class="modal-body">
+            {{ A_("Do you really want to delete this currency?") }}
+          </div>
+          <div class="modal-footer">
+            <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">{{ A_("Cancel") }}</button>
+            <button type="submit" class="btn btn-danger">{{ A_("Confirm") }}</button>
+          </div>
+        </div>
+      </div>
+    </div>
+  </form>
+{% endif %}
+
+<div class="accounting-card col-sm-6">
+  <div class="accounting-card-title">{{ obj.name }}</div>
+  <div class="accounting-card-code">{{ obj.code }}</div>
+  <div class="small text-secondary fst-italic">
+    <div>{{ A_("Created") }} {{ obj.created_at }} {{ obj.created_by }}</div>
+    <div>{{ A_("Updated") }} {{ obj.updated_at }} {{ obj.updated_by }}</div>
+  </div>
+</div>
+
+{% endblock %}

src/accounting/templates/accounting/currency/edit.html

@@ -0,0 +1,30 @@
+{#
+The Mia! Accounting Flask Project
+edit.html: The currency edit form
+
+ Copyright (c) 2023 imacat.
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+Author: imacat@mail.imacat.idv.tw (imacat)
+First written: 2023/2/6
+#}
+{% extends "accounting/currency/include/form.html" %}
+
+{% block header %}{% block title %}{{ A_("%(currency)s Settings", currency=currency) }}{% endblock %}{% endblock %}
+
+{% block back_url %}{{ url_for("accounting.currency.detail", currency=currency)|accounting_inherit_next }}{% endblock %}
+
+{% block action_url %}{{ url_for("accounting.currency.update", currency=currency) }}{% endblock %}
+
+{% block original_code %}{{ currency.code }}{% endblock %}

src/accounting/templates/accounting/currency/include/form.html

@@ -0,0 +1,68 @@
+{#
+The Mia! Accounting Flask Project
+form.html: The currency form
+
+ Copyright (c) 2023 imacat.
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+Author: imacat@mail.imacat.idv.tw (imacat)
+First written: 2023/2/6
+#}
+{% extends "accounting/base.html" %}
+
+{% block accounting_scripts %}
+  <script src="{{ url_for("accounting.static", filename="js/currency-form.js") }}"></script>
+{% endblock %}
+
+{% block content %}
+
+<div class="btn-group btn-actions mb-3">
+  <a class="btn btn-primary" role="button" href="{% block back_url %}{% endblock %}">
+    <i class="fa-solid fa-circle-chevron-left"></i>
+    {{ A_("Back") }}
+  </a>
+</div>
+
+<form id="accounting-form" action="{% block action_url %}{% endblock %}" method="post">
+  {{ form.csrf_token }}
+  {% if "next" in request.args %}
+    <input type="hidden" name="next" value="{{ request.args["next"] }}">
+  {% endif %}
+  <div class="form-floating mb-3">
+    <input id="accounting-code" class="form-control {% if form.code.errors %} is-invalid {% endif %}" type="text" name="code" value="{{ "" if form.code.data is none else form.code.data }}" placeholder=" " required="required" data-exists-url="{{ url_for("accounting.currency-api.exists") }}" data-original="{% block original_code %}{% endblock %}" data-blocklist="{{ form.CODE_BLOCKLIST|tojson|forceescape }}">
+    <label class="form-label" for="accounting-code">{{ A_("Code") }}</label>
+    <div id="accounting-code-error" class="invalid-feedback">{% if form.code.errors %}{{ form.code.errors[0] }}{% endif %}</div>
+  </div>
+
+  <div class="form-floating mb-3">
+    <input id="accounting-name" class="form-control {% if form.name.errors %} is-invalid {% endif %}" type="text" name="name" value="{{ "" if form.name.data is none else form.name.data }}" placeholder=" " required="required">
+    <label class="form-label" for="accounting-name">{{ A_("Name") }}</label>
+    <div id="accounting-name-error" class="invalid-feedback">{% if form.name.errors %}{{ form.name.errors[0] }}{% endif %}</div>
+  </div>
+
+  <div class="d-none d-md-block">
+    <button class="btn btn-primary" type="submit">
+      <i class="fa-solid fa-floppy-disk"></i>
+      {{ A_("Save") }}
+    </button>
+  </div>
+
+  <div class="d-md-none accounting-material-fab">
+    <button class="btn btn-primary" type="submit">
+      <i class="fa-solid fa-floppy-disk"></i>
+    </button>
+  </div>
+</form>
+
+{% endblock %}

src/accounting/templates/accounting/currency/list.html

@@ -0,0 +1,68 @@
+{#
+The Mia! Accounting Flask Project
+list.html: The currency list
+
+ Copyright (c) 2023 imacat.
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+Author: imacat@mail.imacat.idv.tw (imacat)
+First written: 2023/2/6
+#}
+{% extends "accounting/base.html" %}
+
+{% block header %}{% block title %}{% if "q" in request.args %}{{ A_("Search Result for \"%(query)s\"", query=request.args["q"]) }}{% else %}{{ A_("Currency Management") }}{% endif %}{% endblock %}{% endblock %}
+
+{% block content %}
+
+<div class="btn-group mb-2">
+  {% if accounting_can_edit() %}
+    <a class="btn btn-primary text-nowrap d-none d-md-block" href="{{ url_for("accounting.currency.create")|accounting_append_next }}">
+      <i class="fa-solid fa-plus"></i>
+      {{ A_("New") }}
+    </a>
+  {% endif %}
+  <form class="btn btn-primary d-flex input-group" action="{{ url_for("accounting.currency.list") }}" method="get" role="search">
+    <input id="accounting-search" class="form-control form-control-sm accounting-search-input" type="search" name="q" value="{{ request.args["q"] if "q" in request.args else "" }}" placeholder=" " required="required" aria-label="Search">
+    <label for="accounting-search" class="accounting-search-label">
+      <button type="submit">
+        <i class="fa-solid fa-magnifying-glass"></i>
+        {{ A_("Search") }}
+      </button>
+    </label>
+  </form>
+</div>
+
+{% if accounting_can_edit() %}
+  <div class="d-md-none accounting-material-fab">
+    <a class="btn btn-primary" href="{{ url_for("accounting.currency.create")|accounting_append_next }}">
+      <i class="fa-solid fa-plus"></i>
+    </a>
+  </div>
+{% endif %}
+
+{% if list %}
+  {% include "accounting/include/pagination.html" %}
+
+  <div class="list-group">
+  {% for item in list %}
+    <a class="list-group-item list-group-item-action" href="{{ url_for("accounting.currency.detail", currency=item)|accounting_append_next }}">
+      {{ item }}
+    </a>
+  {% endfor %}
+  </div>
+{% else %}
+  <p>{{ A_("There is no data.") }}</p>
+{% endif %}
+
+{% endblock %}

src/accounting/templates/accounting/include/nav.html

@@ -19,7 +19,7 @@ nav.html: The navigation menu for the accounting application.
 Author: imacat@mail.imacat.idv.tw (imacat)
 First written: 2023/1/26
 #}
-{% if can_view_accounting() %}
+{% if accounting_can_view() %}
   <li class="nav-item dropdown">
     <span class="nav-link dropdown-toggle" data-bs-toggle="dropdown">
       <i class="fa-solid fa-gear"></i>
@@ -38,6 +38,12 @@ First written: 2023/1/26
           {{ A_("Base Accounts") }}
         </a>
       </li>
+      <li>
+        <a class="dropdown-item {% if request.endpoint.startswith("accounting.currency.") %} active {% endif %}" href="{{ url_for("accounting.currency.list") }}">
+          <i class="fa-solid fa-money-bill-wave"></i>
+          {{ A_("Currencies") }}
+        </a>
+      </li>
     </ul>
   </li>
 {% endif %}

src/accounting/templates/accounting/include/pagination.html

@@ -19,10 +19,10 @@ pagination.html: The pagination navigation bar.
 Author: imacat@mail.imacat.idv.tw (imacat)
 First written: 2023/1/26
 #}
-{% if pagination.is_needed %}
+{% if pagination.is_paged %}
   <nav aria-label="Page navigation">
     <ul class="pagination">
-      {% for link in pagination.page_links %}
+      {% for link in pagination.pages %}
         {% if link.uri is none %}
           <li class="page-item disabled {% if not link.is_for_mobile %} d-none d-md-inline {% endif %}">
             <span class="page-link">
@@ -42,7 +42,7 @@ First written: 2023/1/26
           {{ pagination.page_size }}
         </div>
         <ul class="dropdown-menu">
-          {% for link in pagination.page_sizes %}
+          {% for link in pagination.page_size_options %}
             <li>
               <a class="dropdown-item {% if link.is_current %} active {% endif %}" href="{{ link.uri }}">
                 {{ link.text }}

src/accounting/translations/zh_Hant/LC_MESSAGES/accounting.po

@@ -8,8 +8,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Mia! Accounting Flask 0.0.0\n"
 "Report-Msgid-Bugs-To: imacat@mail.imacat.idv.tw\n"
-"POT-Creation-Date: 2023-02-03 10:15+0800\n"
-"PO-Revision-Date: 2023-02-03 10:16+0800\n"
+"POT-Creation-Date: 2023-02-07 16:22+0800\n"
+"PO-Revision-Date: 2023-02-07 18:04+0800\n"
 "Last-Translator: imacat <imacat@mail.imacat.idv.tw>\n"
 "Language: zh_Hant\n"
 "Language-Team: zh_Hant <imacat@mail.imacat.idv.tw>\n"
@@ -23,17 +23,21 @@ msgstr ""
 msgid "The base account does not exist."
 msgstr "沒有這個基本科目。"
 
-#: src/accounting/account/forms.py:50
+#: src/accounting/account/forms.py:52
+msgid "The base account is not available."
+msgstr "不能選這個基本科目。"
+
+#: src/accounting/account/forms.py:61
 #: src/accounting/static/js/account-form.js:110
 msgid "Please select the base account."
 msgstr "請選擇基本科目。"
 
-#: src/accounting/account/forms.py:55
+#: src/accounting/account/forms.py:67
 msgid "Please fill in the title"
 msgstr "請填上標題。"
 
 #: src/accounting/account/query.py:50
-#: src/accounting/templates/accounting/account/detail.html:88
+#: src/accounting/templates/accounting/account/detail.html:90
 #: src/accounting/templates/accounting/account/list.html:62
 msgid "Offset needed"
 msgstr "逐筆核銷"
@@ -50,18 +54,59 @@ msgstr "科目未異動。"
 msgid "The account is updated successfully."
 msgstr "科目存好了。"
 
-#: src/accounting/account/views.py:167
+#: src/accounting/account/views.py:165
 msgid "The account is deleted successfully."
 msgstr "科目刪掉了"
 
-#: src/accounting/account/views.py:194
+#: src/accounting/account/views.py:192
 msgid "The order was not modified."
 msgstr "順序未異動。"
 
-#: src/accounting/account/views.py:197
+#: src/accounting/account/views.py:195
 msgid "The order is updated successfully."
 msgstr "順序存好了。"
 
+#: src/accounting/currency/forms.py:47
+#: src/accounting/static/js/currency-form.js:136
+msgid "Code conflicts with another currency."
+msgstr "代碼與其它貨幣重複。"
+
+#: src/accounting/currency/forms.py:52
+#: src/accounting/static/js/currency-form.js:92
+msgid "Please fill in the code."
+msgstr "請填上代碼。"
+
+#: src/accounting/currency/forms.py:54
+#: src/accounting/static/js/currency-form.js:103
+msgid "Code can only be composed of 3 upper-cased letters."
+msgstr "代碼限為三個大寫英文字母。"
+
+#: src/accounting/currency/forms.py:57
+#: src/accounting/static/js/currency-form.js:98
+msgid "This code is not available."
+msgstr "不能用這個代碼。"
+
+#: src/accounting/currency/forms.py:63
+#: src/accounting/static/js/currency-form.js:168
+msgid "Please fill in the name."
+msgstr "請填上名稱。"
+
+#: src/accounting/currency/views.py:90
+msgid "The currency is added successfully"
+msgstr "貨幣加好了。"
+
+#: src/accounting/currency/views.py:146
+msgid "The currency was not modified."
+msgstr "貨幣未異動。"
+
+#: src/accounting/currency/views.py:151
+msgid "The currency is updated successfully."
+msgstr "貨幣存好了。"
+
+#: src/accounting/currency/views.py:167
+msgid "The currency is deleted successfully."
+msgstr "貨幣刪掉了"
+
 #: src/accounting/static/js/account-form.js:130
 msgid "Please fill in the title."
 msgstr "請填上標題。"
@@ -74,43 +119,51 @@ msgstr "新增科目"
 #: src/accounting/templates/accounting/account/include/form.html:33
 #: src/accounting/templates/accounting/account/order.html:36
 #: src/accounting/templates/accounting/base-account/detail.html:31
+#: src/accounting/templates/accounting/currency/detail.html:31
+#: src/accounting/templates/accounting/currency/include/form.html:33
 msgid "Back"
 msgstr "回上頁"
 
 #: src/accounting/templates/accounting/account/detail.html:36
+#: src/accounting/templates/accounting/currency/detail.html:36
 msgid "Settings"
 msgstr "設定"
 
-#: src/accounting/templates/accounting/account/detail.html:40
+#: src/accounting/templates/accounting/account/detail.html:41
 msgid "Order"
 msgstr "次序"
 
-#: src/accounting/templates/accounting/account/detail.html:44
+#: src/accounting/templates/accounting/account/detail.html:46
+#: src/accounting/templates/accounting/currency/detail.html:42
 msgid "Delete"
 msgstr "刪除"
 
-#: src/accounting/templates/accounting/account/detail.html:67
+#: src/accounting/templates/accounting/account/detail.html:69
 msgid "Delete Account Confirmation"
 msgstr "科目刪除確認"
 
-#: src/accounting/templates/accounting/account/detail.html:71
+#: src/accounting/templates/accounting/account/detail.html:73
 msgid "Do you really want to delete this account?"
 msgstr "你確定要刪掉這個科目嗎？"
 
-#: src/accounting/templates/accounting/account/detail.html:74
+#: src/accounting/templates/accounting/account/detail.html:76
 #: src/accounting/templates/accounting/account/include/form.html:111
+#: src/accounting/templates/accounting/currency/detail.html:72
 msgid "Cancel"
 msgstr "取消"
 
-#: src/accounting/templates/accounting/account/detail.html:75
+#: src/accounting/templates/accounting/account/detail.html:77
+#: src/accounting/templates/accounting/currency/detail.html:73
 msgid "Confirm"
 msgstr "確定"
 
-#: src/accounting/templates/accounting/account/detail.html:92
+#: src/accounting/templates/accounting/account/detail.html:94
+#: src/accounting/templates/accounting/currency/detail.html:85
 msgid "Created"
 msgstr "建檔"
 
-#: src/accounting/templates/accounting/account/detail.html:93
+#: src/accounting/templates/accounting/account/detail.html:95
+#: src/accounting/templates/accounting/currency/detail.html:86
 msgid "Updated"
 msgstr "更新"
 
@@ -119,22 +172,33 @@ msgstr "更新"
 msgid "%(account)s Settings"
 msgstr "%(account)s設定"
 
+#: src/accounting/templates/accounting/account/list.html:24
+#: src/accounting/templates/accounting/base-account/list.html:24
+#: src/accounting/templates/accounting/currency/list.html:24
+#, python-format
+msgid "Search Result for \"%(query)s\""
+msgstr "「%(query)s」搜尋結果"
+
 #: src/accounting/templates/accounting/account/list.html:24
 msgid "Account Management"
 msgstr "科目管理"
 
 #: src/accounting/templates/accounting/account/list.html:32
+#: src/accounting/templates/accounting/currency/list.html:32
 msgid "New"
 msgstr "新增"
 
 #: src/accounting/templates/accounting/account/include/form.html:98
 #: src/accounting/templates/accounting/account/list.html:40
 #: src/accounting/templates/accounting/base-account/list.html:34
+#: src/accounting/templates/accounting/currency/list.html:40
 msgid "Search"
 msgstr "搜尋"
 
 #: src/accounting/templates/accounting/account/list.html:68
+#: src/accounting/templates/accounting/account/order.html:81
 #: src/accounting/templates/accounting/base-account/list.html:51
+#: src/accounting/templates/accounting/currency/list.html:57
 msgid "There is no data."
 msgstr "沒有資料。"
 
@@ -144,7 +208,8 @@ msgid "The Accounts of %(base)s"
 msgstr "%(base)s下的科目"
 
 #: src/accounting/templates/accounting/account/include/form.html:75
-#: src/accounting/templates/accounting/account/order.html:61
+#: src/accounting/templates/accounting/account/order.html:62
+#: src/accounting/templates/accounting/currency/include/form.html:57
 msgid "Save"
 msgstr "儲存"
 
@@ -177,6 +242,35 @@ msgstr "清除"
 msgid "Base Account Managements"
 msgstr "基本科目管理"
 
+#: src/accounting/templates/accounting/currency/create.html:24
+msgid "Add a New Currency"
+msgstr "新增貨幣"
+
+#: src/accounting/templates/accounting/currency/detail.html:65
+msgid "Delete Currency Confirmation"
+msgstr "貨幣刪除確認"
+
+#: src/accounting/templates/accounting/currency/detail.html:69
+msgid "Do you really want to delete this currency?"
+msgstr "你確定要刪掉這個貨幣嗎？"
+
+#: src/accounting/templates/accounting/currency/edit.html:24
+#, python-format
+msgid "%(currency)s Settings"
+msgstr "%(currency)s設定"
+
+#: src/accounting/templates/accounting/currency/list.html:24
+msgid "Currency Management"
+msgstr "貨幣管理"
+
+#: src/accounting/templates/accounting/currency/include/form.html:44
+msgid "Code"
+msgstr "代碼"
+
+#: src/accounting/templates/accounting/currency/include/form.html:50
+msgid "Name"
+msgstr "名稱"
+
 #: src/accounting/templates/accounting/include/nav.html:26
 msgid "Accounting"
 msgstr "記帳"
@@ -189,11 +283,17 @@ msgstr "科目"
 msgid "Base Accounts"
 msgstr "基本科目"
 
-#: src/accounting/utils/pagination.py:146
-msgid "Previous"
-msgstr "前一頁"
+#: src/accounting/templates/accounting/include/nav.html:44
+msgid "Currencies"
+msgstr "貨幣"
 
-#: src/accounting/utils/pagination.py:194
+#: src/accounting/utils/pagination.py:206
+msgctxt "Pagination|"
+msgid "Previous"
+msgstr "上一頁"
+
+#: src/accounting/utils/pagination.py:255
+msgctxt "Pagination|"
 msgid "Next"
 msgstr "下一頁"
 

src/accounting/utils/next_url.py

@@ -22,7 +22,7 @@ This module should not import any other module from the application.
 from urllib.parse import urlparse, parse_qsl, ParseResult, urlencode, \
     urlunparse
 
-from flask import request
+from flask import request, Blueprint
 
 
 def append_next(uri: str) -> str:
@@ -73,3 +73,14 @@ def __set_next(uri: str, next_uri: str) -> str:
     parts: list[str] = list(uri_p)
     parts[4] = urlencode(params)
     return urlunparse(parts)
+
+
+def init_app(bp: Blueprint) -> None:
+    """Initializes the application.
+
+    :param bp: The blueprint of the accounting application.
+    :return: None.
+    """
+    bp.add_app_template_filter(append_next, "accounting_append_next")
+    bp.add_app_template_filter(inherit_next, "accounting_inherit_next")
+    bp.add_app_template_filter(or_next, "accounting_or_next")

src/accounting/utils/pagination.py

@@ -24,12 +24,13 @@ from urllib.parse import urlparse, parse_qsl, urlencode, urlunparse, \
     ParseResult
 
 from flask import request
+from werkzeug.routing import RequestRedirect
 
-from accounting.locale import gettext
+from accounting.locale import gettext, pgettext
 
 
-class PageLink:
-    """A link in the pagination."""
+class Link:
+    """A link."""
 
     def __init__(self, text: str, uri: str | None = None,
                  is_current: bool = False, is_for_mobile: bool = False):
@@ -52,15 +53,20 @@ class PageLink:
         """Whether the link should be shown on mobile screens."""
 
 
+class Redirection(RequestRedirect):
+    """The redirection."""
+    code = 302
+    """The HTTP code."""
+
+
+DEFAULT_PAGE_SIZE: int = 10
+"""The default page size."""
+
 T = t.TypeVar("T")
 
 
 class Pagination(t.Generic[T]):
-    """The pagination utilities"""
-    AVAILABLE_PAGE_SIZES: list[int] = [10, 100, 200]
-    """The available page sizes."""
-    DEFAULT_PAGE_SIZE: int = 10
-    """The default page size."""
+    """The pagination utility."""
 
     def __init__(self, items: list[T], is_reversed: bool = False):
         """Constructs the pagination.
@@ -68,130 +74,186 @@ class Pagination(t.Generic[T]):
         :param items: The items.
         :param is_reversed: True if the default page is the last page, or False
             otherwise.
+        :raise Redirection: When the pagination parameters are malformed.
         """
-        self.__items: list[T] = items
-        """All the items."""
-        self.__is_reversed: bool = is_reversed
-        """Whether the default page is the last page."""
-        self.page_size: int = int(request.args.get("page-size",
-                                                   self.DEFAULT_PAGE_SIZE))
-        """The number of items in a page."""
-        self.__total_pages: int = 0 if len(items) == 0 \
-            else int((len(items) - 1) / self.page_size) + 1
-        """The total number of pages."""
-        self.is_needed: bool = self.__total_pages > 1
+        pagination: AbstractPagination[T] = EmptyPagination[T]() \
+            if len(items) == 0 \
+            else NonEmptyPagination[T](items, is_reversed)
+        self.is_paged: bool = pagination.is_paged
+        """Whether there should be pagination."""
+        self.list: list[T] = pagination.list
+        """The items shown in the list"""
+        self.pages: list[Link] = pagination.pages
+        """The pages."""
+        self.page_size: int = pagination.page_size
+        """The number of items in a page."""
+        self.page_size_options: list[Link] = pagination.page_size_options
+        """The options to the number of items in a page."""
+
+
+class AbstractPagination(t.Generic[T]):
+    """An abstract pagination."""
+
+    def __init__(self):
+        """Constructs an empty pagination."""
+        self.page_size: int = DEFAULT_PAGE_SIZE
+        """The number of items in a page."""
+        self.is_paged: bool = False
         """Whether there should be pagination."""
-        self.__default_page_no: int = 0
-        """The default page number."""
-        self.page_no: int = 0
-        """The current page number."""
         self.list: list[T] = []
         """The items shown in the list"""
-        if self.__total_pages > 0:
-            self.__set_list()
+        self.pages: list[Link] = []
+        """The pages."""
+        self.page_size_options: list[Link] = []
+        """The options to the number of items in a page."""
+
+
+class EmptyPagination(AbstractPagination[T]):
+    """The pagination from empty data."""
+    pass
+
+
+class NonEmptyPagination(AbstractPagination[T]):
+    """The pagination with real data."""
+    PAGE_SIZE_OPTIONS: list[int] = [10, 100, 200]
+    """The page size options."""
+
+    def __init__(self, items: list[T], is_reversed: bool = False):
+        """Constructs the pagination.
+
+        :param items: The items.
+        :param is_reversed: True if the default page is the last page, or False
+            otherwise.
+        :raise Redirection: When the pagination parameters are malformed.
+        """
+        super().__init__()
         self.__current_uri: str = request.full_path if request.query_string \
             else request.path
         """The current URI."""
-        self.__base_uri_params: tuple[list[str], list[tuple[str, str]]] \
-            = self.__get_base_uri_params()
-        """The base URI parameters."""
-        self.page_links: list[PageLink] = self.__get_page_links()
-        """The pagination links."""
-        self.page_sizes: list[PageLink] = self.__get_page_sizes()
-        """The links to switch the number of items in a page."""
-
-    def __set_list(self) -> None:
-        """Sets the items to show in the list.
-
-        :return: None.
-        """
-        self.__default_page_no = self.__total_pages if self.__is_reversed \
-            else 1
-        self.page_no = int(request.args.get("page-no",
-                                            self.__default_page_no))
-        if self.page_no < 1:
-            self.page_no = 1
-        if self.page_no > self.__total_pages:
-            self.page_no = self.__total_pages
-        lower_bound: int = (self.page_no - 1) * self.page_size
+        self.__is_reversed: bool = is_reversed
+        """Whether the default page is the last page."""
+        self.page_size = self.__get_page_size()
+        self.__total_pages: int = int((len(items) - 1) / self.page_size) + 1
+        """The total number of pages."""
+        self.is_paged = self.__total_pages > 1
+        self.__default_page_no: int = self.__total_pages \
+            if self.__is_reversed else 1
+        """The default page number."""
+        self.__page_no: int = self.__get_page_no()
+        """The current page number."""
+        lower_bound: int = (self.__page_no - 1) * self.page_size
         upper_bound: int = lower_bound + self.page_size
-        if upper_bound > len(self.__items):
-            upper_bound = len(self.__items)
-        self.list = self.__items[lower_bound:upper_bound]
+        if upper_bound > len(items):
+            upper_bound = len(items)
+        self.list = items[lower_bound:upper_bound]
+        self.pages = self.__get_pages()
+        self.page_size_options = self.__get_page_size_options()
 
-    def __get_base_uri_params(self) -> tuple[list[str], list[tuple[str, str]]]:
-        """Returns the base URI and its parameters, with the "page-no" and
-        "page-size" parameters removed.
+    def __get_page_size(self) -> int:
+        """Returns the page size.
 
-        :return: The URI parts and the cleaned-up query parameters.
+        :return: The page size.
+        :raise Redirection: When the page size is malformed.
         """
-        uri_p: ParseResult = urlparse(self.__current_uri)
-        params: list[tuple[str, str]] = parse_qsl(uri_p.query)
-        params = [x for x in params if x[0] not in ["page-no", "page-size"]]
-        parts: list[str] = list(uri_p)
-        return parts, params
+        if "page-size" not in request.args:
+            return DEFAULT_PAGE_SIZE
+        try:
+            page_size: int = int(request.args["page-size"])
+        except ValueError:
+            raise Redirection(self.__uri_set("page-size", None))
+        if page_size == DEFAULT_PAGE_SIZE or page_size < 1:
+            raise Redirection(self.__uri_set("page-size", None))
+        return page_size
 
-    def __get_page_links(self) -> list[PageLink]:
+    def __get_page_no(self) -> int:
+        """Returns the page number.
+
+        :return: The page number.
+        :raise Redirection: When the page number is malformed.
+        """
+        if "page-no" not in request.args:
+            return self.__default_page_no
+        try:
+            page_no: int = int(request.args["page-no"])
+        except ValueError:
+            raise Redirection(self.__uri_set("page-no", None))
+        if page_no == self.__default_page_no:
+            raise Redirection(self.__uri_set("page-no", None))
+        if page_no < 1:
+            if not self.__is_reversed:
+                raise Redirection(self.__uri_set("page-no", None))
+            raise Redirection(self.__uri_set("page-no", "1"))
+        if page_no > self.__total_pages:
+            if self.__is_reversed:
+                raise Redirection(self.__uri_set("page-no", None))
+            raise Redirection(self.__uri_set("page-no",
+                                             str(self.__total_pages)))
+        return page_no
+
+    def __get_pages(self) -> list[Link]:
         """Returns the page links in the pagination navigation.
 
         :return: The page links in the pagination navigation.
         """
-        if self.__total_pages < 2:
+        if not self.is_paged:
             return []
         uri: str | None
-        links: list[PageLink] = []
+        links: list[Link] = []
 
         # The previous page.
-        uri = None if self.page_no == 1 else self.__uri_page(self.page_no - 1)
-        links.append(PageLink(gettext("Previous"), uri, is_for_mobile=True))
+        uri = None if self.__page_no == 1 \
+            else self.__uri_page(self.__page_no - 1)
+        links.append(Link(pgettext("Pagination|", "Previous"), uri,
+                          is_for_mobile=True))
 
         # The first page.
-        if self.page_no > 1:
-            links.append(PageLink("1", self.__uri_page(1)))
+        if self.__page_no > 1:
+            links.append(Link("1", self.__uri_page(1)))
 
         # The eclipse of the previous pages.
-        if self.page_no - 3 == 2:
-            links.append(PageLink(str(self.page_no - 3),
-                                  self.__uri_page(self.page_no - 3)))
-        elif self.page_no - 3 > 2:
-            links.append(PageLink("…"))
+        if self.__page_no - 3 == 2:
+            links.append(Link(str(self.__page_no - 3),
+                              self.__uri_page(self.__page_no - 3)))
+        elif self.__page_no - 3 > 2:
+            links.append(Link("…"))
 
         # The previous two pages.
-        if self.page_no - 2 > 1:
-            links.append(PageLink(str(self.page_no - 2),
-                                  self.__uri_page(self.page_no - 2)))
-        if self.page_no - 1 > 1:
-            links.append(PageLink(str(self.page_no - 1),
-                                  self.__uri_page(self.page_no - 1)))
+        if self.__page_no - 2 > 1:
+            links.append(Link(str(self.__page_no - 2),
+                              self.__uri_page(self.__page_no - 2)))
+        if self.__page_no - 1 > 1:
+            links.append(Link(str(self.__page_no - 1),
+                              self.__uri_page(self.__page_no - 1)))
 
         # The current page.
-        links.append(PageLink(str(self.page_no), self.__uri_page(self.page_no),
+        links.append(Link(str(self.__page_no), self.__uri_page(self.__page_no),
                           is_current=True))
 
         # The next two pages.
-        if self.page_no + 1 < self.__total_pages:
-            links.append(PageLink(str(self.page_no + 1),
-                                  self.__uri_page(self.page_no + 1)))
-        if self.page_no + 2 < self.__total_pages:
-            links.append(PageLink(str(self.page_no + 2),
-                                  self.__uri_page(self.page_no + 2)))
+        if self.__page_no + 1 < self.__total_pages:
+            links.append(Link(str(self.__page_no + 1),
+                              self.__uri_page(self.__page_no + 1)))
+        if self.__page_no + 2 < self.__total_pages:
+            links.append(Link(str(self.__page_no + 2),
+                              self.__uri_page(self.__page_no + 2)))
 
         # The eclipse of the next pages.
-        if self.page_no + 3 == self.__total_pages - 1:
-            links.append(PageLink(str(self.page_no + 3),
-                                  self.__uri_page(self.page_no + 3)))
-        elif self.page_no + 3 < self.__total_pages - 1:
-            links.append(PageLink("…"))
+        if self.__page_no + 3 == self.__total_pages - 1:
+            links.append(Link(str(self.__page_no + 3),
+                              self.__uri_page(self.__page_no + 3)))
+        elif self.__page_no + 3 < self.__total_pages - 1:
+            links.append(Link("…"))
 
         # The last page.
-        if self.page_no < self.__total_pages:
-            links.append(PageLink(str(self.__total_pages),
+        if self.__page_no < self.__total_pages:
+            links.append(Link(str(self.__total_pages),
                               self.__uri_page(self.__total_pages)))
 
         # The next page.
-        uri = None if self.page_no == self.__total_pages \
-            else self.__uri_page(self.page_no + 1)
-        links.append(PageLink(gettext("Next"), uri, is_for_mobile=True))
+        uri = None if self.__page_no == self.__total_pages \
+            else self.__uri_page(self.__page_no + 1)
+        links.append(Link(pgettext("Pagination|", "Next"), uri,
+                          is_for_mobile=True))
 
         return links
 
@@ -201,21 +263,22 @@ class Pagination(t.Generic[T]):
         :param page_no: The page number.
         :return: The URI of the page.
         """
-        params: list[tuple[str, str]] = []
-        if page_no != self.__default_page_no:
-            params.append(("page-no", str(page_no)))
-        if self.page_size != self.DEFAULT_PAGE_SIZE:
-            params.append(("page-size", str(self.page_size)))
-        return self.__uri_set_params(params)
+        if page_no == self.__page_no:
+            return self.__current_uri
+        if page_no == self.__default_page_no:
+            return self.__uri_set("page-no", None)
+        return self.__uri_set("page-no", str(page_no))
 
-    def __get_page_sizes(self) -> list[PageLink]:
-        """Returns the available page sizes.
+    def __get_page_size_options(self) -> list[Link]:
+        """Returns the page size options.
 
-        :return: The available page sizes.
+        :return: The page size options.
         """
-        return [PageLink(str(x), self.__uri_size(x),
+        if not self.is_paged:
+            return []
+        return [Link(str(x), self.__uri_size(x),
                      is_current=x == self.page_size)
-                for x in self.AVAILABLE_PAGE_SIZES]
+                for x in self.PAGE_SIZE_OPTIONS]
 
     def __uri_size(self, page_size: int) -> str:
         """Returns the URI of a page size.
@@ -225,16 +288,34 @@ class Pagination(t.Generic[T]):
         """
         if page_size == self.page_size:
             return self.__current_uri
-        return self.__uri_set_params([("page-size", str(page_size))])
+        if page_size == DEFAULT_PAGE_SIZE:
+            return self.__uri_set("page-size", None)
+        return self.__uri_set("page-size", str(page_size))
 
-    def __uri_set_params(self, params: list[tuple[str, str]]) -> str:
-        """Returns the URI with the query parameters set.
+    def __uri_set(self, name: str, value: str | None) -> str:
+        """Raises current URI with a parameter set.
 
-        :param params: The query parameters.
-        :return: The URI with the query parameters set.
+        :param name: The name of the parameter.
+        :param value: The value, or None to remove the parameter.
+        :return: The URI with the parameter set.
         """
-        cur_params: list[tuple[str, str]] = self.__base_uri_params[1].copy()
-        cur_params.extend(params)
-        parts: list[str] = self.__base_uri_params[0].copy()
-        parts[4] = urlencode(cur_params)
+        uri_p: ParseResult = urlparse(self.__current_uri)
+        params: list[tuple[str, str]] = parse_qsl(uri_p.query)
+
+        # Try to keep the position of the parameter.
+        i: int = 0
+        is_found: bool = False
+        while i < len(params):
+            if params[i][0] == name:
+                if is_found or value is None:
+                    params = params[:i] + params[i + 1:]
+                    continue
+                params[i] = (name, value)
+                is_found = True
+            i = i + 1
+        if not is_found and value is not None:
+            params.append((name, value))
+
+        parts: list[str] = list(uri_p)
+        parts[4] = urlencode(params)
         return urlunparse(parts)

src/accounting/utils/permission.py

@@ -21,7 +21,9 @@ This module should not import any other module from the application.
 """
 import typing as t
 
-from flask import Flask, abort
+from flask import abort, Blueprint
+
+from accounting.utils.user import get_current_user
 
 
 def has_permission(rule: t.Callable[[], bool]) -> t.Callable:
@@ -75,17 +77,22 @@ def can_view() -> bool:
 def can_edit() -> bool:
     """Returns whether the current user can edit the account data.
 
+    The user has to log in.
+
     :return: True if the current user can edit the accounting data, or False
         otherwise.
     """
+    if get_current_user() is None:
+        return False
     return __can_edit_func()
 
 
-def init_app(app: Flask, can_view_func: t.Callable[[], bool] | None = None,
+def init_app(bp: Blueprint,
+             can_view_func: t.Callable[[], bool] | None = None,
              can_edit_func: t.Callable[[], bool] | None = None) -> None:
     """Initializes the application.
 
-    :param app: The Flask application.
+    :param bp: The blueprint of the accounting application.
     :param can_view_func: A callback that returns whether the current user can
         view the accounting data.
     :param can_edit_func: A callback that returns whether the current user can
@@ -97,5 +104,5 @@ def init_app(app: Flask, can_view_func: t.Callable[[], bool] | None = None,
         __can_view_func = can_view_func
     if can_edit_func is not None:
         __can_edit_func = can_edit_func
-    app.jinja_env.globals["can_view_accounting"] = __can_view_func
-    app.jinja_env.globals["can_edit_accounting"] = __can_edit_func
+    bp.add_app_template_global(can_view, "accounting_can_view")
+    bp.add_app_template_global(can_edit, "accounting_can_edit")

src/accounting/utils/query.py

@@ -34,11 +34,22 @@ def parse_query_keywords(q: str | None) -> list[str]:
     if q == "":
         return []
     keywords: list[str] = []
-    while q is not None:
-        m: re.Match = re.match(r"(?:\"([^\"]+)\"|(\S+))(?:\s+(.+)|)$", q)
-        if m.group(1) is not None:
+    while True:
+        m: re.Match
+        m = re.match(r"\"([^\"]+)\"\s+(.+)$", q)
+        if m is not None:
             keywords.append(m.group(1))
-        else:
-            keywords.append(m.group(2))
-        q = m.group(3)
+            q = m.group(2)
+            continue
+        m = re.match(r"\"([^\"]+)\"?$", q)
+        if m is not None:
+            keywords.append(m.group(1))
+            break
+        m = re.match(r"(\S+)\s+(.+)$", q)
+        if m is not None:
+            keywords.append(m.group(1))
+            q = m.group(2)
+            continue
+        keywords.append(q)
+        break
     return keywords

src/accounting/utils/user.py

@@ -23,6 +23,7 @@ import typing as t
 from abc import ABC, abstractmethod
 
 import sqlalchemy as sa
+from flask import g
 from flask_sqlalchemy.model import Model
 
 T = t.TypeVar("T", bound=Model)
@@ -49,10 +50,11 @@ class AbstractUserUtils(t.Generic[T], ABC):
 
     @property
     @abstractmethod
-    def current_user(self) -> T:
-        """Returns the current user.
+    def current_user(self) -> T | None:
+        """Returns the currently logged-in user.
 
-        :return: The current user.
+        :return: The currently logged-in user, or None if the user has not
+            logged in
         """
 
     @abstractmethod
@@ -72,9 +74,9 @@ class AbstractUserUtils(t.Generic[T], ABC):
 
 __user_utils: AbstractUserUtils
 """The user utilities."""
-user_cls: t.Type[Model]
+user_cls: t.Type[Model] = Model
 """The user class."""
-user_pk_column: sa.Column
+user_pk_column: sa.Column = sa.Column(sa.Integer)
 """The primary key column of the user class."""
 
 
@@ -95,7 +97,7 @@ def get_current_user_pk() -> int:
 
     :return: The primary key value of the currently logged-in user.
     """
-    return __user_utils.get_pk(__user_utils.current_user)
+    return __user_utils.get_pk(get_current_user())
 
 
 def has_user(username: str) -> bool:
@@ -114,3 +116,14 @@ def get_user_pk(username: str) -> int:
     :return: The primary key value of the user by the username.
     """
     return __user_utils.get_pk(__user_utils.get_by_username(username))
+
+
+def get_current_user() -> user_cls | None:
+    """Returns the currently logged-in user.  The result is cached in the
+    current request.
+
+    :return: The currently logged-in user.
+    """
+    if not hasattr(g, "_accounting_user"):
+        setattr(g, "_accounting_user", __user_utils.current_user)
+    return getattr(g, "_accounting_user")

tests/test_account.py

@@ -14,10 +14,10 @@
 #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
-
 """The test for the account management.
 
 """
+import time
 import unittest
 
 import httpx
@@ -26,8 +26,40 @@ from click.testing import Result
 from flask import Flask
 from flask.testing import FlaskCliRunner
 
-from testlib import UserClient, get_user_client
 from test_site import create_app
+from testlib import get_client, set_locale
+
+
+class AccountData:
+    """The account data."""
+
+    def __init__(self, base_code: str, no: int, title: str):
+        """Constructs the account data.
+
+        :param base_code: The base code.
+        :param no: The number.
+        :param title: The title.
+        """
+        self.base_code: str = base_code
+        """The base code."""
+        self.no: int = no
+        """The number."""
+        self.title: str = title
+        """The title."""
+        self.code: str = f"{self.base_code}-{self.no:03d}"
+        """The code."""
+
+
+cash: AccountData = AccountData("1111", 1, "Cash")
+"""The cash account."""
+bank: AccountData = AccountData("1113", 1, "Bank")
+"""The bank account."""
+stock: AccountData = AccountData("1121", 1, "Stock")
+"""The stock account."""
+loan: AccountData = AccountData("2112", 1, "Loan")
+"""The loan account."""
+PREFIX: str = "/accounting/accounts"
+"""The URL prefix of the currency management."""
 
 
 class AccountCommandTestCase(unittest.TestCase):
@@ -109,26 +141,24 @@ class AccountTestCase(unittest.TestCase):
             Account.query.delete()
             db.session.commit()
 
-        editor: UserClient = get_user_client(self, self.app, "editor")
-        self.client: httpx.Client = editor.client
-        self.csrf_token: str = editor.csrf_token
+        self.client, self.csrf_token = get_client(self, self.app, "editor")
         response: httpx.Response
 
-        response = self.client.post("/accounting/accounts/store",
+        response = self.client.post(f"{PREFIX}/store",
                                     data={"csrf_token": self.csrf_token,
-                                          "base_code": "1111",
-                                          "title": "1111 title"})
+                                          "base_code": cash.base_code,
+                                          "title": cash.title})
         self.assertEqual(response.status_code, 302)
         self.assertEqual(response.headers["Location"],
-                         "/accounting/accounts/1111-001")
+                         f"{PREFIX}/{cash.code}")
 
-        response = self.client.post("/accounting/accounts/store",
+        response = self.client.post(f"{PREFIX}/store",
                                     data={"csrf_token": self.csrf_token,
-                                          "base_code": "1112",
-                                          "title": "1112 title"})
+                                          "base_code": bank.base_code,
+                                          "title": bank.title})
         self.assertEqual(response.status_code, 302)
         self.assertEqual(response.headers["Location"],
-                         "/accounting/accounts/1112-001")
+                         f"{PREFIX}/{bank.code}")
 
     def test_nobody(self) -> None:
         """Test the permission as nobody.
@@ -136,47 +166,47 @@ class AccountTestCase(unittest.TestCase):
         :return: None.
         """
         from accounting.models import Account
+        client, csrf_token = get_client(self, self.app, "nobody")
         response: httpx.Response
-        nobody: UserClient = get_user_client(self, self.app, "nobody")
 
-        response = nobody.client.get("/accounting/accounts")
+        response = client.get(PREFIX)
         self.assertEqual(response.status_code, 403)
 
-        response = nobody.client.get("/accounting/accounts/1111-001")
+        response = client.get(f"{PREFIX}/{cash.code}")
         self.assertEqual(response.status_code, 403)
 
-        response = nobody.client.get("/accounting/accounts/create")
+        response = client.get(f"{PREFIX}/create")
         self.assertEqual(response.status_code, 403)
 
-        response = nobody.client.post("/accounting/accounts/store",
-                                      data={"csrf_token": nobody.csrf_token,
-                                            "base_code": "1113",
-                                            "title": "1113 title"})
+        response = client.post(f"{PREFIX}/store",
+                               data={"csrf_token": csrf_token,
+                                     "base_code": stock.base_code,
+                                     "title": stock.title})
         self.assertEqual(response.status_code, 403)
 
-        response = nobody.client.get("/accounting/accounts/1111-001/edit")
+        response = client.get(f"{PREFIX}/{cash.code}/edit")
         self.assertEqual(response.status_code, 403)
 
-        response = nobody.client.post("/accounting/accounts/1111-001/update",
-                                      data={"csrf_token": nobody.csrf_token,
-                                            "base_code": "1111",
-                                            "title": "1111 title #2"})
+        response = client.post(f"{PREFIX}/{cash.code}/update",
+                               data={"csrf_token": csrf_token,
+                                     "base_code": cash.base_code,
+                                     "title": f"{cash.title}-2"})
         self.assertEqual(response.status_code, 403)
 
-        response = nobody.client.post("/accounting/accounts/1111-001/delete",
-                                      data={"csrf_token": nobody.csrf_token})
+        response = client.post(f"{PREFIX}/{cash.code}/delete",
+                               data={"csrf_token": csrf_token})
         self.assertEqual(response.status_code, 403)
 
-        response = nobody.client.get("/accounting/accounts/bases/1111")
+        response = client.get(f"{PREFIX}/bases/{cash.base_code}")
         self.assertEqual(response.status_code, 403)
 
         with self.app.app_context():
-            account_id: int = Account.find_by_code("1112-001").id
+            bank_id: int = Account.find_by_code(bank.code).id
 
-        response = nobody.client.post("/accounting/accounts/bases/1112",
-                                      data={"csrf_token": nobody.csrf_token,
+        response = client.post(f"{PREFIX}/bases/{bank.base_code}",
+                               data={"csrf_token": csrf_token,
                                      "next": "/next",
-                                            f"{account_id}-no": "5"})
+                                     f"{bank_id}-no": "5"})
         self.assertEqual(response.status_code, 403)
 
     def test_viewer(self) -> None:
@@ -185,47 +215,47 @@ class AccountTestCase(unittest.TestCase):
         :return: None.
         """
         from accounting.models import Account
+        client, csrf_token = get_client(self, self.app, "viewer")
         response: httpx.Response
-        viewer: UserClient = get_user_client(self, self.app, "viewer")
 
-        response = viewer.client.get("/accounting/accounts")
+        response = client.get(PREFIX)
         self.assertEqual(response.status_code, 200)
 
-        response = viewer.client.get("/accounting/accounts/1111-001")
+        response = client.get(f"{PREFIX}/{cash.code}")
         self.assertEqual(response.status_code, 200)
 
-        response = viewer.client.get("/accounting/accounts/create")
+        response = client.get(f"{PREFIX}/create")
         self.assertEqual(response.status_code, 403)
 
-        response = viewer.client.post("/accounting/accounts/store",
-                                      data={"csrf_token": viewer.csrf_token,
-                                            "base_code": "1113",
-                                            "title": "1113 title"})
+        response = client.post(f"{PREFIX}/store",
+                               data={"csrf_token": csrf_token,
+                                     "base_code": stock.base_code,
+                                     "title": stock.title})
         self.assertEqual(response.status_code, 403)
 
-        response = viewer.client.get("/accounting/accounts/1111-001/edit")
+        response = client.get(f"{PREFIX}/{cash.code}/edit")
         self.assertEqual(response.status_code, 403)
 
-        response = viewer.client.post("/accounting/accounts/1111-001/update",
-                                      data={"csrf_token": viewer.csrf_token,
-                                            "base_code": "1111",
-                                            "title": "1111 title #2"})
+        response = client.post(f"{PREFIX}/{cash.code}/update",
+                               data={"csrf_token": csrf_token,
+                                     "base_code": cash.base_code,
+                                     "title": f"{cash.title}-2"})
         self.assertEqual(response.status_code, 403)
 
-        response = viewer.client.post("/accounting/accounts/1111-001/delete",
-                                      data={"csrf_token": viewer.csrf_token})
+        response = client.post(f"{PREFIX}/{cash.code}/delete",
+                               data={"csrf_token": csrf_token})
         self.assertEqual(response.status_code, 403)
 
-        response = viewer.client.get("/accounting/accounts/bases/1111")
+        response = client.get(f"{PREFIX}/bases/{cash.base_code}")
         self.assertEqual(response.status_code, 200)
 
         with self.app.app_context():
-            account_id: int = Account.find_by_code("1112-001").id
+            bank_id: int = Account.find_by_code(bank.code).id
 
-        response = viewer.client.post("/accounting/accounts/bases/1112",
-                                      data={"csrf_token": viewer.csrf_token,
+        response = client.post(f"{PREFIX}/bases/{bank.base_code}",
+                               data={"csrf_token": csrf_token,
                                      "next": "/next",
-                                            f"{account_id}-no": "5"})
+                                     f"{bank_id}-no": "5"})
         self.assertEqual(response.status_code, 403)
 
     def test_editor(self) -> None:
@@ -236,107 +266,382 @@ class AccountTestCase(unittest.TestCase):
         from accounting.models import Account
         response: httpx.Response
 
-        response = self.client.get("/accounting/accounts")
+        response = self.client.get(PREFIX)
         self.assertEqual(response.status_code, 200)
 
-        response = self.client.get("/accounting/accounts/1111-001")
+        response = self.client.get(f"{PREFIX}/{cash.code}")
         self.assertEqual(response.status_code, 200)
 
-        response = self.client.get("/accounting/accounts/create")
+        response = self.client.get(f"{PREFIX}/create")
         self.assertEqual(response.status_code, 200)
 
-        response = self.client.post("/accounting/accounts/store",
+        response = self.client.post(f"{PREFIX}/store",
                                     data={"csrf_token": self.csrf_token,
-                                          "base_code": "1113",
-                                          "title": "1113 title"})
+                                          "base_code": stock.base_code,
+                                          "title": stock.title})
         self.assertEqual(response.status_code, 302)
         self.assertEqual(response.headers["Location"],
-                         "/accounting/accounts/1113-001")
+                         f"{PREFIX}/{stock.code}")
 
-        response = self.client.get("/accounting/accounts/1111-001/edit")
+        response = self.client.get(f"{PREFIX}/{cash.code}/edit")
         self.assertEqual(response.status_code, 200)
 
-        response = self.client.post("/accounting/accounts/1111-001/update",
+        response = self.client.post(f"{PREFIX}/{cash.code}/update",
                                     data={"csrf_token": self.csrf_token,
-                                          "base_code": "1111",
-                                          "title": "1111 title #2"})
+                                          "base_code": cash.base_code,
+                                          "title": f"{cash.title}-2"})
         self.assertEqual(response.status_code, 302)
-        self.assertEqual(response.headers["Location"],
-                         "/accounting/accounts/1111-001")
+        self.assertEqual(response.headers["Location"], f"{PREFIX}/{cash.code}")
 
-        response = self.client.post("/accounting/accounts/1111-001/delete",
+        response = self.client.post(f"{PREFIX}/{cash.code}/delete",
                                     data={"csrf_token": self.csrf_token})
         self.assertEqual(response.status_code, 302)
-        self.assertEqual(response.headers["Location"],
-                         "/accounting/accounts")
+        self.assertEqual(response.headers["Location"], PREFIX)
 
-        response = self.client.get("/accounting/accounts/bases/1111")
+        response = self.client.get(f"{PREFIX}/bases/{cash.base_code}")
         self.assertEqual(response.status_code, 200)
 
         with self.app.app_context():
-            account_id: int = Account.find_by_code("1112-001").id
+            bank_id: int = Account.find_by_code(bank.code).id
 
-        response = self.client.post("/accounting/accounts/bases/1112",
+        response = self.client.post(f"{PREFIX}/bases/{bank.base_code}",
                                     data={"csrf_token": self.csrf_token,
                                           "next": "/next",
-                                          f"{account_id}-no": "5"})
+                                          f"{bank_id}-no": "5"})
         self.assertEqual(response.status_code, 302)
         self.assertEqual(response.headers["Location"], "/next")
 
-    def test_change_base(self) -> None:
-        """Tests to change the base account.
+    def test_add(self) -> None:
+        """Tests to add the currencies.
 
         :return: None.
         """
         from accounting.database import db
         from accounting.models import Account
+        create_uri: str = f"{PREFIX}/create"
+        store_uri: str = f"{PREFIX}/store"
+        detail_uri: str = f"{PREFIX}/{stock.code}"
         response: httpx.Response
 
-        response = self.client.post("/accounting/accounts/store",
-                                    data={"csrf_token": self.csrf_token,
-                                          "base_code": "1111",
-                                          "title": "Title #1"})
-        self.assertEqual(response.status_code, 302)
-        self.assertEqual(response.headers["Location"],
-                         "/accounting/accounts/1111-002")
+        with self.app.app_context():
+            self.assertEqual({x.code for x in Account.query.all()},
+                             {cash.code, bank.code})
 
-        response = self.client.post("/accounting/accounts/store",
-                                    data={"csrf_token": self.csrf_token,
-                                          "base_code": "1111",
-                                          "title": "Title #1"})
-        self.assertEqual(response.status_code, 302)
-        self.assertEqual(response.headers["Location"],
-                         "/accounting/accounts/1111-003")
+        # Missing CSRF token
+        response = self.client.post(store_uri,
+                                    data={"base_code": stock.base_code,
+                                          "title": stock.title})
+        self.assertEqual(response.status_code, 400)
 
-        response = self.client.post("/accounting/accounts/store",
+        # CSRF token mismatch
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": f"{self.csrf_token}-2",
+                                          "base_code": stock.base_code,
+                                          "title": stock.title})
+        self.assertEqual(response.status_code, 400)
+
+        # Empty base account code
+        response = self.client.post(store_uri,
                                     data={"csrf_token": self.csrf_token,
-                                          "base_code": "1112",
-                                          "title": "Title #1"})
+                                          "base_code": " ",
+                                          "title": stock.title})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], create_uri)
+
+        # Non-existing base account
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": "9999",
+                                          "title": stock.title})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], create_uri)
+
+        # Unavailable base account
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": "1",
+                                          "title": stock.title})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], create_uri)
+
+        # Empty name
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": stock.base_code,
+                                          "title": " "})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], create_uri)
+
+        # Success, with spaces to be stripped
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": f" {stock.base_code} ",
+                                          "title": f" {stock.title} "})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        # Success under the same base
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": stock.base_code,
+                                          "title": stock.title})
         self.assertEqual(response.status_code, 302)
         self.assertEqual(response.headers["Location"],
-                         "/accounting/accounts/1112-002")
+                         f"{PREFIX}/{stock.base_code}-002")
+
+        # Success under the same base, with order in a mess.
+        with self.app.app_context():
+            stock_2: Account = Account.find_by_code(f"{stock.base_code}-002")
+            stock_2.no = 66
+            db.session.commit()
+
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": stock.base_code,
+                                          "title": stock.title})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"],
+                         f"{PREFIX}/{stock.base_code}-067")
 
         with self.app.app_context():
-            id_1: int = Account.find_by_code("1111-001").id
-            id_2: int = Account.find_by_code("1111-002").id
-            id_3: int = Account.find_by_code("1111-003").id
-            id_4: int = Account.find_by_code("1112-001").id
-            id_5: int = Account.find_by_code("1112-002").id
+            self.assertEqual({x.code for x in Account.query.all()},
+                             {cash.code, bank.code, stock.code,
+                              f"{stock.base_code}-066",
+                              f"{stock.base_code}-067"})
 
-        response = self.client.post("/accounting/accounts/1111-002/update",
+            stock_account: Account = Account.find_by_code(stock.code)
+            self.assertEqual(stock_account.base_code, stock.base_code)
+            self.assertEqual(stock_account.title_l10n, stock.title)
+
+    def test_basic_update(self) -> None:
+        """Tests the basic rules to update a user.
+
+        :return: None.
+        """
+        from accounting.models import Account
+        detail_uri: str = f"{PREFIX}/{cash.code}"
+        edit_uri: str = f"{PREFIX}/{cash.code}/edit"
+        update_uri: str = f"{PREFIX}/{cash.code}/update"
+        detail_c_uri: str = f"{PREFIX}/{stock.code}"
+        response: httpx.Response
+
+        # Success, with spaces to be stripped
+        response = self.client.post(update_uri,
                                     data={"csrf_token": self.csrf_token,
-                                          "base_code": "1112",
-                                          "title": "Account #1"})
+                                          "base_code": f" {cash.base_code} ",
+                                          "title": f" {cash.title}-1 "})
         self.assertEqual(response.status_code, 302)
-        self.assertEqual(response.headers["Location"],
-                         "/accounting/accounts/1112-003")
+        self.assertEqual(response.headers["Location"], detail_uri)
 
         with self.app.app_context():
-            self.assertEqual(db.session.get(Account, id_1).code, "1111-001")
-            self.assertEqual(db.session.get(Account, id_2).code, "1112-003")
-            self.assertEqual(db.session.get(Account, id_3).code, "1111-002")
-            self.assertEqual(db.session.get(Account, id_4).code, "1112-001")
-            self.assertEqual(db.session.get(Account, id_5).code, "1112-002")
+            cash_account: Account = Account.find_by_code(cash.code)
+            self.assertEqual(cash_account.base_code, cash.base_code)
+            self.assertEqual(cash_account.title_l10n, f"{cash.title}-1")
+
+        # Empty base account code
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": " ",
+                                          "title": stock.title})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], edit_uri)
+
+        # Non-existing base account
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": "9999",
+                                          "title": stock.title})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], edit_uri)
+
+        # Unavailable base account
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": "1",
+                                          "title": stock.title})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], edit_uri)
+
+        # Empty name
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": stock.base_code,
+                                          "title": " "})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], edit_uri)
+
+        # Change the base account
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": stock.base_code,
+                                          "title": stock.title})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_c_uri)
+
+        response = self.client.get(detail_uri)
+        self.assertEqual(response.status_code, 404)
+
+        response = self.client.get(detail_c_uri)
+        self.assertEqual(response.status_code, 200)
+
+    def test_update_not_modified(self) -> None:
+        """Tests that the data is not modified.
+
+        :return: None.
+        """
+        from accounting.models import Account
+        detail_uri: str = f"{PREFIX}/{cash.code}"
+        update_uri: str = f"{PREFIX}/{cash.code}/update"
+        response: httpx.Response
+        time.sleep(1)
+
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": f" {cash.base_code} ",
+                                          "title": f" {cash.title} "})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        with self.app.app_context():
+            cash_account: Account = Account.find_by_code(cash.code)
+            self.assertIsNotNone(cash_account)
+            self.assertEqual(cash_account.created_at, cash_account.updated_at)
+
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": cash.base_code,
+                                          "title": stock.title})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        with self.app.app_context():
+            cash_account: Account = Account.find_by_code(cash.code)
+            self.assertIsNotNone(cash_account)
+            self.assertNotEqual(cash_account.created_at,
+                                cash_account.updated_at)
+
+    def test_created_updated_by(self) -> None:
+        """Tests the created-by and updated-by record.
+
+        :return: None.
+        """
+        from accounting.models import Account
+        editor_username, editor2_username = "editor", "editor2"
+        client, csrf_token = get_client(self, self.app, editor2_username)
+        detail_uri: str = f"{PREFIX}/{cash.code}"
+        update_uri: str = f"{PREFIX}/{cash.code}/update"
+        response: httpx.Response
+
+        with self.app.app_context():
+            cash_account: Account = Account.find_by_code(cash.code)
+            self.assertEqual(cash_account.created_by.username, editor_username)
+            self.assertEqual(cash_account.updated_by.username, editor_username)
+
+        response = client.post(update_uri,
+                               data={"csrf_token": csrf_token,
+                                     "base_code": cash.base_code,
+                                     "title": f"{cash.title}-2"})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        with self.app.app_context():
+            cash_account: Account = Account.find_by_code(cash.code)
+            self.assertEqual(cash_account.created_by.username,
+                             editor_username)
+            self.assertEqual(cash_account.updated_by.username,
+                             editor2_username)
+
+    def test_l10n(self) -> None:
+        """Tests the localization.
+
+        :return: None
+        """
+        from accounting.models import Account
+        detail_uri: str = f"{PREFIX}/{cash.code}"
+        update_uri: str = f"{PREFIX}/{cash.code}/update"
+        response: httpx.Response
+
+        with self.app.app_context():
+            cash_account: Account = Account.find_by_code(cash.code)
+            self.assertEqual(cash_account.title_l10n, cash.title)
+            self.assertEqual(cash_account.l10n, [])
+
+        set_locale(self, self.client, self.csrf_token, "zh_Hant")
+
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": cash.base_code,
+                                          "title": f"{cash.title}-zh_Hant"})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        with self.app.app_context():
+            cash_account: Account = Account.find_by_code(cash.code)
+            self.assertEqual(cash_account.title_l10n, cash.title)
+            self.assertEqual({(x.locale, x.title) for x in cash_account.l10n},
+                             {("zh_Hant", f"{cash.title}-zh_Hant")})
+
+        set_locale(self, self.client, self.csrf_token, "en")
+
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": cash.base_code,
+                                          "title": f"{cash.title}-2"})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        with self.app.app_context():
+            cash_account: Account = Account.find_by_code(cash.code)
+            self.assertEqual(cash_account.title_l10n, f"{cash.title}-2")
+            self.assertEqual({(x.locale, x.title) for x in cash_account.l10n},
+                             {("zh_Hant", f"{cash.title}-zh_Hant")})
+
+        set_locale(self, self.client, self.csrf_token, "zh_Hant")
+
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "base_code": cash.base_code,
+                                          "title": f"{cash.title}-zh_Hant-2"})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        with self.app.app_context():
+            cash_account: Account = Account.find_by_code(cash.code)
+            self.assertEqual(cash_account.title_l10n, f"{cash.title}-2")
+            self.assertEqual({(x.locale, x.title) for x in cash_account.l10n},
+                             {("zh_Hant", f"{cash.title}-zh_Hant-2")})
+
+    def test_delete(self) -> None:
+        """Tests to delete a currency.
+
+        :return: None.
+        """
+        from accounting.models import Account
+        detail_uri: str = f"{PREFIX}/{cash.code}"
+        delete_uri: str = f"{PREFIX}/{cash.code}/delete"
+        list_uri: str = PREFIX
+        response: httpx.Response
+
+        with self.app.app_context():
+            self.assertEqual({x.code for x in Account.query.all()},
+                             {cash.code, bank.code})
+
+        response = self.client.get(detail_uri)
+        self.assertEqual(response.status_code, 200)
+        response = self.client.post(delete_uri,
+                                    data={"csrf_token": self.csrf_token})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], list_uri)
+
+        with self.app.app_context():
+            self.assertEqual({x.code for x in Account.query.all()},
+                             {bank.code})
+
+        response = self.client.get(detail_uri)
+        self.assertEqual(response.status_code, 404)
+        response = self.client.post(delete_uri,
+                                    data={"csrf_token": self.csrf_token})
+        self.assertEqual(response.status_code, 404)
 
     def test_reorder(self) -> None:
         """Tests to reorder the accounts under a same base account.
@@ -348,13 +653,13 @@ class AccountTestCase(unittest.TestCase):
         response: httpx.Response
 
         for i in range(2, 6):
-            response = self.client.post("/accounting/accounts/store",
+            response = self.client.post(f"{PREFIX}/store",
                                         data={"csrf_token": self.csrf_token,
                                               "base_code": "1111",
                                               "title": "Title"})
             self.assertEqual(response.status_code, 302)
             self.assertEqual(response.headers["Location"],
-                             f"/accounting/accounts/1111-00{i}")
+                             f"{PREFIX}/1111-00{i}")
 
         # Normal reorder
         with self.app.app_context():
@@ -364,7 +669,7 @@ class AccountTestCase(unittest.TestCase):
             id_4: int = Account.find_by_code("1111-004").id
             id_5: int = Account.find_by_code("1111-005").id
 
-        response = self.client.post("/accounting/accounts/bases/1111",
+        response = self.client.post(f"{PREFIX}/bases/1111",
                                     data={"csrf_token": self.csrf_token,
                                           "next": "/next",
                                           f"{id_1}-no": "4",
@@ -391,7 +696,7 @@ class AccountTestCase(unittest.TestCase):
             db.session.get(Account, id_5).no = 9
             db.session.commit()
 
-        response = self.client.post("/accounting/accounts/bases/1111",
+        response = self.client.post(f"{PREFIX}/bases/1111",
                                     data={"csrf_token": self.csrf_token,
                                           "next": "/next",
                                           f"{id_2}-no": "3a",

tests/test_base_account.py

@@ -14,7 +14,6 @@
 #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
-
 """The test for the base account management.
 
 """
@@ -25,8 +24,8 @@ from click.testing import Result
 from flask import Flask
 from flask.testing import FlaskCliRunner
 
-from testlib import UserClient, get_user_client
 from test_site import create_app
+from testlib import get_client
 
 
 class BaseAccountCommandTestCase(unittest.TestCase):
@@ -88,22 +87,18 @@ class BaseAccountTestCase(unittest.TestCase):
                 result = runner.invoke(args="accounting-init-base")
                 self.assertEqual(result.exit_code, 0)
 
-        self.viewer: UserClient = get_user_client(self, self.app, "viewer")
-        self.editor: UserClient = get_user_client(self, self.app, "editor")
-        self.nobody: UserClient = get_user_client(self, self.app, "nobody")
-
     def test_nobody(self) -> None:
         """Test the permission as nobody.
 
         :return: None.
         """
+        client, csrf_token = get_client(self, self.app, "nobody")
         response: httpx.Response
-        nobody: UserClient = get_user_client(self, self.app, "nobody")
 
-        response = nobody.client.get("/accounting/base-accounts")
+        response = client.get("/accounting/base-accounts")
         self.assertEqual(response.status_code, 403)
 
-        response = nobody.client.get("/accounting/base-accounts/1111")
+        response = client.get("/accounting/base-accounts/1111")
         self.assertEqual(response.status_code, 403)
 
     def test_viewer(self) -> None:
@@ -111,13 +106,13 @@ class BaseAccountTestCase(unittest.TestCase):
 
         :return: None.
         """
+        client, csrf_token = get_client(self, self.app, "viewer")
         response: httpx.Response
-        viewer: UserClient = get_user_client(self, self.app, "viewer")
 
-        response = viewer.client.get("/accounting/base-accounts")
+        response = client.get("/accounting/base-accounts")
         self.assertEqual(response.status_code, 200)
 
-        response = viewer.client.get("/accounting/base-accounts/1111")
+        response = client.get("/accounting/base-accounts/1111")
         self.assertEqual(response.status_code, 200)
 
     def test_editor(self) -> None:
@@ -125,11 +120,11 @@ class BaseAccountTestCase(unittest.TestCase):
 
         :return: None.
         """
+        client, csrf_token = get_client(self, self.app, "editor")
         response: httpx.Response
-        editor: UserClient = get_user_client(self, self.app, "editor")
 
-        response = editor.client.get("/accounting/base-accounts")
+        response = client.get("/accounting/base-accounts")
         self.assertEqual(response.status_code, 200)
 
-        response = editor.client.get("/accounting/base-accounts/1111")
+        response = client.get("/accounting/base-accounts/1111")
         self.assertEqual(response.status_code, 200)

tests/test_currency.py

@@ -0,0 +1,595 @@
+# The Mia! Accounting Flask Project.
+# Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/1
+
+#  Copyright (c) 2023 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+"""The test for the currency management.
+
+"""
+import time
+import unittest
+
+import httpx
+from click.testing import Result
+from flask import Flask
+from flask.testing import FlaskCliRunner
+
+from test_site import create_app
+from testlib import get_client, set_locale
+
+
+class CurrencyData:
+    """The currency data."""
+
+    def __init__(self, code: str, name: str):
+        """Constructs the currency data.
+
+        :param code: The code.
+        :param name: The name.
+        """
+        self.code: str = code
+        """The code."""
+        self.name: str = name
+        """The name."""
+
+
+zza: CurrencyData = CurrencyData("ZZA", "Testing Dollar #A")
+"""The first test currency."""
+zzb: CurrencyData = CurrencyData("ZZB", "Testing Dollar #B")
+"""The second test currency."""
+zzc: CurrencyData = CurrencyData("ZZC", "Testing Dollar #C")
+"""The third test currency."""
+zzd: CurrencyData = CurrencyData("ZZD", "Testing Dollar #D")
+"""The fourth test currency."""
+PREFIX: str = "/accounting/currencies"
+"""The URL prefix of the currency management."""
+
+
+class CurrencyCommandTestCase(unittest.TestCase):
+    """The account console command test case."""
+
+    def setUp(self) -> None:
+        """Sets up the test.
+        This is run once per test.
+
+        :return: None.
+        """
+        self.app: Flask = create_app(is_testing=True)
+
+        runner: FlaskCliRunner = self.app.test_cli_runner()
+        with self.app.app_context():
+            from accounting.database import db
+            from accounting.models import Currency, CurrencyL10n
+            result: Result
+            result = runner.invoke(args="init-db")
+            self.assertEqual(result.exit_code, 0)
+            CurrencyL10n.query.delete()
+            Currency.query.delete()
+            db.session.commit()
+
+    def test_init(self) -> None:
+        """Tests the "accounting-init-currencies" console command.
+
+        :return: None.
+        """
+        from accounting.models import Currency, CurrencyL10n
+        runner: FlaskCliRunner = self.app.test_cli_runner()
+        with self.app.app_context():
+            result: Result = runner.invoke(
+                args=["accounting-init-currencies", "-u", "editor"])
+            self.assertEqual(result.exit_code, 0)
+            currencies: list[Currency] = Currency.query.all()
+            l10n: list[CurrencyL10n] = CurrencyL10n.query.all()
+        self.assertEqual(len(currencies), 2)
+        self.assertEqual(len(l10n), 2 * 2)
+        l10n_keys: set[str] = {f"{x.currency_code}-{x.locale}" for x in l10n}
+        for currency in currencies:
+            self.assertIn(f"{currency.code}-zh_Hant", l10n_keys)
+            self.assertIn(f"{currency.code}-zh_Hant", l10n_keys)
+
+
+class CurrencyTestCase(unittest.TestCase):
+    """The currency test case."""
+
+    def setUp(self) -> None:
+        """Sets up the test.
+        This is run once per test.
+
+        :return: None.
+        """
+        self.app: Flask = create_app(is_testing=True)
+
+        runner: FlaskCliRunner = self.app.test_cli_runner()
+        with self.app.app_context():
+            from accounting.database import db
+            from accounting.models import Currency, CurrencyL10n
+            result: Result
+            result = runner.invoke(args="init-db")
+            self.assertEqual(result.exit_code, 0)
+            CurrencyL10n.query.delete()
+            Currency.query.delete()
+            db.session.commit()
+
+        self.client, self.csrf_token = get_client(self, self.app, "editor")
+        response: httpx.Response
+
+        response = self.client.post(f"{PREFIX}/store",
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": zza.code,
+                                          "name": zza.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], f"{PREFIX}/{zza.code}")
+
+        response = self.client.post(f"{PREFIX}/store",
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": zzb.code,
+                                          "name": zzb.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], f"{PREFIX}/{zzb.code}")
+
+    def test_nobody(self) -> None:
+        """Test the permission as nobody.
+
+        :return: None.
+        """
+        client, csrf_token = get_client(self, self.app, "nobody")
+        response: httpx.Response
+
+        response = client.get(PREFIX)
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/{zza.code}")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/create")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.post(f"{PREFIX}/store",
+                               data={"csrf_token": csrf_token,
+                                     "code": zzc.code,
+                                     "name": zzc.name})
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/{zza.code}/edit")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.post(f"{PREFIX}/{zza.code}/update",
+                               data={"csrf_token": csrf_token,
+                                     "code": zzd.code,
+                                     "name": zzd.name})
+        self.assertEqual(response.status_code, 403)
+
+        response = client.post(f"{PREFIX}/{zzb.code}/delete",
+                               data={"csrf_token": csrf_token})
+        self.assertEqual(response.status_code, 403)
+
+    def test_viewer(self) -> None:
+        """Test the permission as viewer.
+
+        :return: None.
+        """
+        client, csrf_token = get_client(self, self.app, "viewer")
+        response: httpx.Response
+
+        response = client.get(PREFIX)
+        self.assertEqual(response.status_code, 200)
+
+        response = client.get(f"{PREFIX}/{zza.code}")
+        self.assertEqual(response.status_code, 200)
+
+        response = client.get(f"{PREFIX}/create")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.post(f"{PREFIX}/store",
+                               data={"csrf_token": csrf_token,
+                                     "code": zzc.code,
+                                     "name": zzc.name})
+        self.assertEqual(response.status_code, 403)
+
+        response = client.get(f"{PREFIX}/{zza.code}/edit")
+        self.assertEqual(response.status_code, 403)
+
+        response = client.post(f"{PREFIX}/{zza.code}/update",
+                               data={"csrf_token": csrf_token,
+                                     "code": zzd.code,
+                                     "name": zzd.name})
+        self.assertEqual(response.status_code, 403)
+
+        response = client.post(f"{PREFIX}/{zzb.code}/delete",
+                               data={"csrf_token": csrf_token})
+        self.assertEqual(response.status_code, 403)
+
+    def test_editor(self) -> None:
+        """Test the permission as editor.
+
+        :return: None.
+        """
+        response: httpx.Response
+
+        response = self.client.get(PREFIX)
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/{zza.code}")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.get(f"{PREFIX}/create")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.post(f"{PREFIX}/store",
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": zzc.code,
+                                          "name": zzc.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], f"{PREFIX}/{zzc.code}")
+
+        response = self.client.get(f"{PREFIX}/{zza.code}/edit")
+        self.assertEqual(response.status_code, 200)
+
+        response = self.client.post(f"{PREFIX}/{zza.code}/update",
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": zzd.code,
+                                          "name": zzd.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], f"{PREFIX}/{zzd.code}")
+
+        response = self.client.post(f"{PREFIX}/{zzb.code}/delete",
+                                    data={"csrf_token": self.csrf_token})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], PREFIX)
+
+    def test_add(self) -> None:
+        """Tests to add the currencies.
+
+        :return: None.
+        """
+        from accounting.models import Currency
+        from test_site import db
+        create_uri: str = f"{PREFIX}/create"
+        store_uri: str = f"{PREFIX}/store"
+        detail_uri: str = f"{PREFIX}/{zzc.code}"
+        response: httpx.Response
+
+        with self.app.app_context():
+            self.assertEqual({x.code for x in Currency.query.all()},
+                             {zza.code, zzb.code})
+
+        # Missing CSRF token
+        response = self.client.post(store_uri,
+                                    data={"code": zzc.code,
+                                          "name": zzc.name})
+        self.assertEqual(response.status_code, 400)
+
+        # CSRF token mismatch
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": f"{self.csrf_token}-2",
+                                          "code": zzc.code,
+                                          "name": zzc.name})
+        self.assertEqual(response.status_code, 400)
+
+        # Empty code
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": " ",
+                                          "name": zzc.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], create_uri)
+
+        # Blocked code, with spaces to be stripped
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": " create ",
+                                          "name": zzc.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], create_uri)
+
+        # Bad code
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": " zzc ",
+                                          "name": zzc.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], create_uri)
+
+        # Empty name
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": zzc.code,
+                                          "name": " "})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], create_uri)
+
+        # Success, with spaces to be stripped
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": f" {zzc.code} ",
+                                          "name": f" {zzc.name} "})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        # Duplicated code
+        response = self.client.post(store_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": zzc.code,
+                                          "name": zzc.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], create_uri)
+
+        with self.app.app_context():
+            self.assertEqual({x.code for x in Currency.query.all()},
+                             {zza.code, zzb.code, zzc.code})
+
+            zzc_currency: Currency = db.session.get(Currency, zzc.code)
+            self.assertEqual(zzc_currency.code, zzc.code)
+            self.assertEqual(zzc_currency.name_l10n, zzc.name)
+
+    def test_basic_update(self) -> None:
+        """Tests the basic rules to update a user.
+
+        :return: None.
+        """
+        from accounting.models import Currency
+        from test_site import db
+        detail_uri: str = f"{PREFIX}/{zza.code}"
+        edit_uri: str = f"{PREFIX}/{zza.code}/edit"
+        update_uri: str = f"{PREFIX}/{zza.code}/update"
+        detail_c_uri: str = f"{PREFIX}/{zzc.code}"
+        response: httpx.Response
+
+        # Success, with spaces to be stripped
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": f" {zza.code} ",
+                                          "name": f" {zza.name}-1 "})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        with self.app.app_context():
+            zza_currency: Currency = db.session.get(Currency, zza.code)
+            self.assertEqual(zza_currency.code, zza.code)
+            self.assertEqual(zza_currency.name_l10n, f"{zza.name}-1")
+
+        # Empty code
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": " ",
+                                          "name": zzc.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], edit_uri)
+
+        # Blocked code, with spaces to be stripped
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": " create ",
+                                          "name": zzc.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], edit_uri)
+
+        # Bad code
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": "abc/def",
+                                          "name": zzc.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], edit_uri)
+
+        # Empty name
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": zzc.code,
+                                          "name": " "})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], edit_uri)
+
+        # Duplicated code
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": zzb.code,
+                                          "name": zzc.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], edit_uri)
+
+        # Change code
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": zzc.code,
+                                          "name": zzc.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_c_uri)
+
+        response = self.client.get(detail_uri)
+        self.assertEqual(response.status_code, 404)
+
+        response = self.client.get(detail_c_uri)
+        self.assertEqual(response.status_code, 200)
+
+    def test_update_not_modified(self) -> None:
+        """Tests that the data is not modified.
+
+        :return: None.
+        """
+        from accounting.models import Currency
+        from test_site import db
+        detail_uri: str = f"{PREFIX}/{zza.code}"
+        update_uri: str = f"{PREFIX}/{zza.code}/update"
+        response: httpx.Response
+        time.sleep(1)
+
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": f" {zza.code} ",
+                                          "name": f" {zza.name} "})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        with self.app.app_context():
+            zza_currency: Currency = db.session.get(Currency, zza.code)
+            self.assertIsNotNone(zza_currency)
+            self.assertEqual(zza_currency.created_at, zza_currency.updated_at)
+
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": zza.code,
+                                          "name": zzc.name})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        with self.app.app_context():
+            zza_currency: Currency = db.session.get(Currency, zza.code)
+            self.assertIsNotNone(zza_currency)
+            self.assertNotEqual(zza_currency.created_at,
+                                zza_currency.updated_at)
+
+    def test_created_updated_by(self) -> None:
+        """Tests the created-by and updated-by record.
+
+        :return: None.
+        """
+        from accounting.models import Currency
+        from test_site import db
+        editor_username, editor2_username = "editor", "editor2"
+        client, csrf_token = get_client(self, self.app, editor2_username)
+        detail_uri: str = f"{PREFIX}/{zza.code}"
+        update_uri: str = f"{PREFIX}/{zza.code}/update"
+        response: httpx.Response
+
+        with self.app.app_context():
+            zza_currency: Currency = db.session.get(Currency, zza.code)
+            self.assertEqual(zza_currency.created_by.username, editor_username)
+            self.assertEqual(zza_currency.updated_by.username, editor_username)
+
+        response = client.post(update_uri,
+                               data={"csrf_token": csrf_token,
+                                     "code": zza.code,
+                                     "name": f"{zza.name}-2"})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        with self.app.app_context():
+            zza_currency: Currency = db.session.get(Currency, zza.code)
+            self.assertEqual(zza_currency.created_by.username, editor_username)
+            self.assertEqual(zza_currency.updated_by.username, editor2_username)
+
+    def test_api_exists(self) -> None:
+        """Tests the API to check if a code exists.
+
+        :return: None.
+        """
+        response: httpx.Response
+
+        response = self.client.get(
+            f"/accounting/api/currencies/exists-code?q={zza.code}")
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        self.assertEqual(set(data.keys()), {"exists"})
+        self.assertTrue(data["exists"])
+
+        response = self.client.get(
+            f"/accounting/api/currencies/exists-code?q={zza.code}-1")
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        self.assertEqual(set(data.keys()), {"exists"})
+        self.assertFalse(data["exists"])
+
+    def test_l10n(self) -> None:
+        """Tests the localization.
+
+        :return: None
+        """
+        from accounting.models import Currency
+        from test_site import db
+        detail_uri: str = f"{PREFIX}/{zza.code}"
+        update_uri: str = f"{PREFIX}/{zza.code}/update"
+        response: httpx.Response
+
+        with self.app.app_context():
+            zza_currency: Currency = db.session.get(Currency, zza.code)
+            self.assertEqual(zza_currency.name_l10n, zza.name)
+            self.assertEqual(zza_currency.l10n, [])
+
+        set_locale(self, self.client, self.csrf_token, "zh_Hant")
+
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": zza.code,
+                                          "name": f"{zza.name}-zh_Hant"})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        with self.app.app_context():
+            zza_currency: Currency = db.session.get(Currency, zza.code)
+            self.assertEqual(zza_currency.name_l10n, zza.name)
+            self.assertEqual({(x.locale, x.name) for x in zza_currency.l10n},
+                             {("zh_Hant", f"{zza.name}-zh_Hant")})
+
+        set_locale(self, self.client, self.csrf_token, "en")
+
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": zza.code,
+                                          "name": f"{zza.name}-2"})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        with self.app.app_context():
+            zza_currency: Currency = db.session.get(Currency, zza.code)
+            self.assertEqual(zza_currency.name_l10n, f"{zza.name}-2")
+            self.assertEqual({(x.locale, x.name) for x in zza_currency.l10n},
+                             {("zh_Hant", f"{zza.name}-zh_Hant")})
+
+        set_locale(self, self.client, self.csrf_token, "zh_Hant")
+
+        response = self.client.post(update_uri,
+                                    data={"csrf_token": self.csrf_token,
+                                          "code": zza.code,
+                                          "name": f"{zza.name}-zh_Hant-2"})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], detail_uri)
+
+        with self.app.app_context():
+            zza_currency: Currency = db.session.get(Currency, zza.code)
+            self.assertEqual(zza_currency.name_l10n, f"{zza.name}-2")
+            self.assertEqual({(x.locale, x.name) for x in zza_currency.l10n},
+                             {("zh_Hant", f"{zza.name}-zh_Hant-2")})
+
+    def test_delete(self) -> None:
+        """Tests to delete a currency.
+
+        :return: None.
+        """
+        from accounting.models import Currency
+        detail_uri: str = f"{PREFIX}/{zza.code}"
+        delete_uri: str = f"{PREFIX}/{zza.code}/delete"
+        list_uri: str = PREFIX
+        response: httpx.Response
+
+        with self.app.app_context():
+            self.assertEqual({x.code for x in Currency.query.all()},
+                             {zza.code, zzb.code})
+
+        response = self.client.get(detail_uri)
+        self.assertEqual(response.status_code, 200)
+        response = self.client.post(delete_uri,
+                                    data={"csrf_token": self.csrf_token})
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"], list_uri)
+
+        with self.app.app_context():
+            self.assertEqual({x.code for x in Currency.query.all()},
+                             {zzb.code})
+
+        response = self.client.get(detail_uri)
+        self.assertEqual(response.status_code, 404)
+        response = self.client.post(delete_uri,
+                                    data={"csrf_token": self.csrf_token})
+        self.assertEqual(response.status_code, 404)

tests/test_site/__init__.py

@@ -80,7 +80,7 @@ def create_app(is_testing: bool = False) -> Flask:
             return auth.User.id
 
         @property
-        def current_user(self) -> auth.User:
+        def current_user(self) -> auth.User | None:
             return auth.current_user()
 
         def get_by_username(self, username: str) -> auth.User | None:
@@ -91,9 +91,9 @@ def create_app(is_testing: bool = False) -> Flask:
             return user.id
 
     can_view: t.Callable[[], bool] = lambda: auth.current_user() is not None \
-        and auth.current_user().username in ["viewer", "editor"]
+        and auth.current_user().username in ["viewer", "editor", "editor2"]
     can_edit: t.Callable[[], bool] = lambda: auth.current_user() is not None \
-        and auth.current_user().username == "editor"
+        and auth.current_user().username in ["editor", "editor2"]
     accounting.init_app(app, user_utils=UserUtils(),
                         can_view_func=can_view, can_edit_func=can_edit)
 
@@ -106,7 +106,7 @@ def init_db_command() -> None:
     """Initializes the database."""
     db.create_all()
     from .auth import User
-    for username in ["viewer", "editor", "nobody"]:
+    for username in ["viewer", "editor", "editor2", "nobody"]:
         if User.query.filter(User.username == username).first() is None:
             db.session.add(User(username=username))
     db.session.commit()

tests/test_site/auth.py

@@ -58,7 +58,8 @@ def login() -> redirect:
 
     :return: The redirection to the home page.
     """
-    if request.form.get("username") not in ["viewer", "editor", "nobody"]:
+    if request.form.get("username") not in ["viewer", "editor", "editor2",
+                                            "nobody"]:
         return redirect(url_for("auth.login"))
     session["user"] = request.form.get("username")
     return redirect(url_for("home.home"))

tests/test_site/templates/login.html

@@ -29,6 +29,7 @@ First written: 2023/1/27
   <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
   <button class="btn btn-primary" type="submit" name="username" value="viewer">{{ _("Viewer") }}</button>
   <button class="btn btn-primary" type="submit" name="username" value="editor">{{ _("Editor") }}</button>
+  <button class="btn btn-primary" type="submit" name="username" value="editor2">{{ _("Editor2") }}</button>
   <button class="btn btn-primary" type="submit" name="username" value="nobody">{{ _("Nobody") }}</button>
 </form>
 

tests/test_site/translations/zh_Hant/LC_MESSAGES/messages.po

@@ -9,8 +9,8 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Mia! Accounting Flask Demonstration 0.0.0\n"
 "Report-Msgid-Bugs-To: imacat@mail.imacat.idv.tw\n"
-"POT-Creation-Date: 2023-01-28 13:42+0800\n"
-"PO-Revision-Date: 2023-01-28 13:42+0800\n"
+"POT-Creation-Date: 2023-02-06 23:25+0800\n"
+"PO-Revision-Date: 2023-02-06 23:26+0800\n"
 "Last-Translator: imacat <imacat@mail.imacat.idv.tw>\n"
 "Language: zh_Hant\n"
 "Language-Team: zh_Hant <imacat@mail.imacat.idv.tw>\n"
@@ -51,6 +51,10 @@ msgid "Editor"
 msgstr "記帳者"
 
 #: tests/test_site/templates/login.html:32
+msgid "Editor2"
+msgstr "記帳者2"
+
+#: tests/test_site/templates/login.html:33
 msgid "Nobody"
 msgstr "沒有權限者"
 

tests/test_utils.py

@@ -0,0 +1,310 @@
+# The Mia! Accounting Flask Project.
+# Author: imacat@mail.imacat.idv.tw (imacat), 2023/2/3
+
+#  Copyright (c) 2023 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+"""The test for the independent utilities.
+
+"""
+import unittest
+from urllib.parse import quote_plus
+
+import httpx
+from flask import Flask, request
+
+from accounting.utils.next_url import append_next, inherit_next, or_next
+from accounting.utils.pagination import Pagination, DEFAULT_PAGE_SIZE
+from accounting.utils.query import parse_query_keywords
+from test_site import create_app, csrf
+
+
+class NextUriTestCase(unittest.TestCase):
+    """The test case for the next URI utilities."""
+
+    def test_next_uri(self) -> None:
+        """Tests the next URI utilities.
+
+        :return: None.
+        """
+        app: Flask = create_app(is_testing=True)
+        target: str = "/target"
+
+        @app.route("/test-next", methods=["GET", "POST"])
+        @csrf.exempt
+        def test_next_view() -> str:
+            """The test view with the next URI."""
+            current_uri: str = request.full_path if request.query_string \
+                else request.path
+            self.assertEqual(append_next(target),
+                             f"{target}?next={quote_plus(current_uri)}")
+            next_uri: str = request.form["next"] if request.method == "POST" \
+                else request.args["next"]
+            self.assertEqual(inherit_next(target),
+                             f"{target}?next={quote_plus(next_uri)}")
+            self.assertEqual(or_next(target), next_uri)
+            return ""
+
+        @app.route("/test-no-next", methods=["GET", "POST"])
+        @csrf.exempt
+        def test_no_next_view() -> str:
+            """The test view without the next URI."""
+            current_uri: str = request.full_path if request.query_string \
+                else request.path
+            self.assertEqual(append_next(target),
+                             f"{target}?next={quote_plus(current_uri)}")
+            self.assertEqual(inherit_next(target), target)
+            self.assertEqual(or_next(target), target)
+            return ""
+
+        client: httpx.Client = httpx.Client(app=app,
+                                            base_url="https://testserver")
+        client.headers["Referer"] = "https://testserver"
+        response: httpx.Response
+
+        # With the next URI
+        response = client.get("/test-next?next=/next&q=abc&page-no=4")
+        self.assertEqual(response.status_code, 200)
+        response = client.post("/test-next", data={"next": "/next",
+                                                   "name": "viewer"})
+        self.assertEqual(response.status_code, 200)
+
+        # Without the next URI
+        response = client.get("/test-no-next?q=abc&page-no=4")
+        self.assertEqual(response.status_code, 200)
+        response = client.post("/test-no-next", data={"name": "viewer"})
+        self.assertEqual(response.status_code, 200)
+
+
+class QueryKeywordParserTestCase(unittest.TestCase):
+    """The test case for the query keyword parser."""
+
+    def test_default(self) -> None:
+        """Tests the query keyword parser.
+
+        :return: None.
+        """
+        self.assertEqual(parse_query_keywords("coffee"), ["coffee"])
+        self.assertEqual(parse_query_keywords("coffee tea"), ["coffee", "tea"])
+        self.assertEqual(parse_query_keywords("\"coffee\" \"tea cake\""),
+                         ["coffee", "tea cake"])
+        self.assertEqual(parse_query_keywords("\"coffee tea\" cheese "
+                                              "\"cake candy\" sugar"),
+                         ["coffee tea", "cheese", "cake candy", "sugar"])
+
+    def test_malformed(self) -> None:
+        """Tests the malformed query.
+
+        :return: None.
+        """
+        self.assertEqual(parse_query_keywords("coffee \"tea cake"),
+                         ["coffee", "tea cake"])
+        self.assertEqual(parse_query_keywords("coffee te\"a ca\"ke"),
+                         ["coffee", "te\"a", "ca\"ke"])
+        self.assertEqual(parse_query_keywords("coffee\" tea cake\""),
+                         ["coffee\"", "tea", "cake\""])
+
+    def test_empty(self) -> None:
+        """Tests the empty query.
+
+        :return: None.
+        """
+        self.assertEqual(parse_query_keywords(None), [])
+        self.assertEqual(parse_query_keywords(""), [])
+
+
+class PaginationTestCase(unittest.TestCase):
+    """The test case for pagination."""
+
+    class Params:
+        """The testing parameters."""
+
+        def __init__(self, items: list[int], is_reversed: bool | None,
+                     result: list[int], is_paged: bool):
+            """Constructs the expected pagination.
+
+            :param items: All the items in the list.
+            :param is_reversed: Whether the default page is the last page.
+            :param result: The expected items on the page.
+            :param is_paged: Whether the pagination is needed.
+            """
+            self.items: list[int] = items
+            self.is_reversed: bool | None = is_reversed
+            self.result: list[int] = result
+            self.is_paged: bool = is_paged
+
+    def setUp(self) -> None:
+        """Sets up the test.
+        This is run once per test.
+
+        :return: None.
+        """
+        self.app: Flask = create_app(is_testing=True)
+        self.params = self.Params([], None, [], True)
+
+        @self.app.get("/test-pagination")
+        def test_pagination_view() -> str:
+            """The test view with the pagination."""
+            pagination: Pagination
+            if self.params.is_reversed is not None:
+                pagination = Pagination[int](
+                    self.params.items, is_reversed=self.params.is_reversed)
+            else:
+                pagination = Pagination[int](self.params.items)
+            self.assertEqual(pagination.is_paged, self.params.is_paged)
+            self.assertEqual(pagination.list, self.params.result)
+            return ""
+
+        self.client = httpx.Client(app=self.app, base_url="https://testserver")
+        self.client.headers["Referer"] = "https://testserver"
+
+    def __test_success(self, query: str, items: range,
+                       result: range, is_paged: bool = True,
+                       is_reversed: bool | None = None) -> None:
+        """Tests the pagination.
+
+        :param query: The query string.
+        :param items: The original items.
+        :param result: The expected page content.
+        :param is_paged: Whether the pagination is needed.
+        :param is_reversed: Whether the list is reversed.
+        :return: None.
+        """
+        target: str = "/test-pagination"
+        if query != "":
+            target = f"{target}?{query}"
+        self.params = self.Params(list(items), is_reversed,
+                                  list(result), is_paged)
+        response: httpx.Response = self.client.get(target)
+        self.assertEqual(response.status_code, 200)
+
+    def __test_malformed(self, query: str, items: range, redirect_to: str,
+                         is_reversed: bool | None = None) -> None:
+        """Tests the pagination.
+
+        :param query: The query string.
+        :param items: The original items.
+        :param redirect_to: The expected target query of the redirection.
+        :param is_reversed: Whether the list is reversed.
+        :return: None.
+        """
+        target: str = "/test-pagination"
+        self.params = self.Params(list(items), is_reversed, [], True)
+        response: httpx.Response = self.client.get(f"{target}?{query}")
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(response.headers["Location"],
+                         f"{target}?{redirect_to}")
+
+    def test_default(self) -> None:
+        """Tests the default pagination.
+
+        :return: None.
+        """
+        # The default first page
+        self.__test_success("", range(1, 687), range(1, 11))
+        # Some page in the middle
+        self.__test_success("page-no=37", range(1, 687), range(361, 371))
+        # The last page
+        self.__test_success("page-no=69", range(1, 687), range(681, 687))
+
+    def test_page_size(self) -> None:
+        """Tests the pagination with a different page size.
+
+        :return: None.
+        """
+        # The default page with a different page size
+        self.__test_success("page-size=15", range(1, 687), range(1, 16))
+        # Some page with a different page size
+        self.__test_success("page-no=37&page-size=15", range(1, 687),
+                            range(541, 556))
+        # The last page with a different page size.
+        self.__test_success("page-no=46&page-size=15", range(1, 687),
+                            range(676, 687))
+
+    def test_not_needed(self) -> None:
+        """Tests the pagination that is not needed.
+
+        :return: None.
+        """
+        # Empty list
+        self.__test_success("", range(0, 0), range(0, 0), is_paged=False)
+        # A list that fits in one page
+        self.__test_success("", range(1, 4), range(1, 4), is_paged=False)
+        # A large page size that fits in everything
+        self.__test_success("page-size=1000", range(1, 687), range(1, 687),
+                            is_paged=False)
+
+    def test_reversed(self) -> None:
+        """Tests the default page on a reversed list.
+
+        :return: None.
+        """
+        # The default page
+        self.__test_success("", range(1, 687), range(681, 687),
+                            is_reversed=True)
+        # The default page with a different page size
+        self.__test_success("page-size=15", range(1, 687), range(676, 687),
+                            is_reversed=True)
+
+    def test_last_page(self) -> None:
+        """Tests the calculation of the items on the last page.
+
+        :return: None.
+        """
+        # The last page that fits in one page
+        self.__test_success("page-no=69", range(1, 691), range(681, 691))
+        # A danging item in the last page
+        self.__test_success("page-no=70", range(1, 692), range(691, 692))
+
+    def test_malformed(self) -> None:
+        """Tests the malformed pagination parameters.
+
+        :return: None.
+        """
+        # A malformed page size
+        self.__test_malformed("q=word&page-size=100a&page-no=37&next=%2F",
+                              range(1, 691), "q=word&page-no=37&next=%2F")
+        # A default page size
+        self.__test_malformed(f"q=word&page-size={DEFAULT_PAGE_SIZE}"
+                              "&page-no=37&next=%2F",
+                              range(1, 691), "q=word&page-no=37&next=%2F")
+        # An invalid page size
+        self.__test_malformed("q=word&page-size=0&page-no=37&next=%2F",
+                              range(1, 691), "q=word&page-no=37&next=%2F")
+        # A malformed page number
+        self.__test_malformed("q=word&page-size=15&page-no=37a&next=%2F",
+                              range(1, 691), "q=word&page-size=15&next=%2F")
+        # A default page number
+        self.__test_malformed("q=word&page-size=15&page-no=1&next=%2F",
+                              range(1, 691), "q=word&page-size=15&next=%2F")
+        # A default page number, on a reversed list
+        self.__test_malformed("q=word&page-size=15&page-no=46&next=%2F",
+                              range(1, 691), "q=word&page-size=15&next=%2F",
+                              is_reversed=True)
+        # A page number beyond the last page
+        self.__test_malformed("q=word&page-size=15&page-no=100&next=%2F",
+                              range(1, 691),
+                              "q=word&page-size=15&page-no=46&next=%2F")
+        # A page number beyond the last page, on a reversed list
+        self.__test_malformed("q=word&page-size=15&page-no=100&next=%2F",
+                              range(1, 691),
+                              "q=word&page-size=15&next=%2F", is_reversed=True)
+        # A page number before the first page
+        self.__test_malformed("q=word&page-size=15&page-no=0&next=%2F",
+                              range(1, 691),
+                              "q=word&page-size=15&next=%2F")
+        # A page number before the first page, on a reversed list
+        self.__test_malformed("q=word&page-size=15&page-no=0&next=%2F",
+                              range(1, 691),
+                              "q=word&page-size=15&page-no=1&next=%2F",
+                              is_reversed=True)

tests/testlib.py

@@ -17,6 +17,7 @@
 """The common test libraries.
 
 """
+import typing as t
 from html.parser import HTMLParser
 from unittest import TestCase
 
@@ -24,27 +25,14 @@ import httpx
 from flask import Flask
 
 
-class UserClient:
-    """A user client."""
-
-    def __init__(self, client: httpx.Client, csrf_token: str):
-        """Constructs a user client.
-
-        :param client: The client.
-        :param csrf_token: The CSRF token.
-        """
-        self.client: httpx.Client = client
-        self.csrf_token: str = csrf_token
-
-
-def get_user_client(test_case: TestCase, app: Flask, username: str) \
-        -> UserClient:
+def get_client(test_case: TestCase, app: Flask, username: str) \
+        -> tuple[httpx.Client, str]:
     """Returns a user client.
 
     :param test_case: The test case.
     :param app: The Flask application.
     :param username: The username.
-    :return: The user client.
+    :return: A tuple of the client and the CSRF token.
     """
     client: httpx.Client = httpx.Client(app=app, base_url="https://testserver")
     client.headers["Referer"] = "https://testserver"
@@ -54,7 +42,7 @@ def get_user_client(test_case: TestCase, app: Flask, username: str) \
                                                  "username": username})
     test_case.assertEqual(response.status_code, 302)
     test_case.assertEqual(response.headers["Location"], "/")
-    return UserClient(client, csrf_token)
+    return client, csrf_token
 
 
 def get_csrf_token(test_case: TestCase, client: httpx.Client, uri: str) -> str:
@@ -88,3 +76,21 @@ def get_csrf_token(test_case: TestCase, client: httpx.Client, uri: str) -> str:
     parser.feed(response.text)
     test_case.assertIsNotNone(parser.csrf_token)
     return parser.csrf_token
+
+
+def set_locale(test_case: TestCase, client: httpx.Client, csrf_token: str,
+               locale: t.Literal["en", "zh_Hant", "zh_Hans"]) -> None:
+    """Sets the current locale.
+
+    :param test_case: The test case.
+    :param client: The test client.
+    :param csrf_token: The CSRF token.
+    :param locale: The locale.
+    :return: None.
+    """
+    response: httpx.Response = client.post("/locale",
+                                           data={"csrf_token": csrf_token,
+                                                 "locale": locale,
+                                                 "next": "/next"})
+    test_case.assertEqual(response.status_code, 302)
+    test_case.assertEqual(response.headers["Location"], "/next")