Fixed the styles of the negative numbers in the reports with red and braced absolute values.

src/accounting/report/template_filters.py

@@ -0,0 +1,37 @@
+# The Mia! Accounting Flask Project.
+# Author: imacat@mail.imacat.idv.tw (imacat), 2023/3/7
+
+#  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 template filters for the reports.
+
+"""
+from decimal import Decimal
+
+from accounting.template_filters import format_amount as core_format_amount
+
+
+def format_amount(value: Decimal | None) -> str | None:
+    """Formats an amount for the report.
+
+    :param value: The amount.
+    :return: The formatted amount text.
+    """
+    if value is None:
+        return ""
+    is_negative: bool = value < 0
+    formatted: str = core_format_amount(abs(value))
+    if is_negative:
+        formatted = f"({formatted})"
+    return formatted

src/accounting/report/views.py

@@ -24,9 +24,11 @@ from accounting.utils.permission import has_permission, can_view
 from .period import Period
 from .reports import Journal, Ledger, IncomeExpenses, TrialBalance, \
     IncomeStatement, BalanceSheet
+from .template_filters import format_amount
 
 bp: Blueprint = Blueprint("report", __name__)
 """The view blueprint for the reports."""
+bp.add_app_template_filter(format_amount, "accounting_report_format_amount")
 
 
 @bp.get("journal", endpoint="journal-default")