CSV取込機能を実装し、Expenseモデルと関連するStore・ExpenseCategoryモデルを追加。CSVパーサーを作成し、出光CSVに対応。明細編集画面のAJAX保存機能を実装し、取込結果を表示する機能を追加。作業ログをdiary.mdに追記。

expenses/csv_parsers/__init__.py

@@ -0,0 +1,7 @@
+from .factory import get_parser
+from .idemitsu import IdemitsuParser
+
+__all__ = [
+    'get_parser',
+    'IdemitsuParser',
+]

expenses/csv_parsers/base.py

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+from __future__ import annotations
+
+from dataclasses import dataclass
+from datetime import date
+from typing import Iterable
+
+
+@dataclass(frozen=True)
+class ExpenseRow:
+    use_date: date
+    description: str
+    amount: int
+    note: str
+    source: str
+    source_hash: str
+
+
+class CSVParserBase:
+    source: str = ''
+
+    def detect(self, header_line: str) -> bool:
+        raise NotImplementedError
+
+    def parse(self, lines: Iterable[str]) -> list[ExpenseRow]:
+        raise NotImplementedError

expenses/csv_parsers/factory.py

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+from __future__ import annotations
+
+from typing import Iterable
+
+from .base import CSVParserBase
+from .idemitsu import IdemitsuParser
+
+
+PARSERS: list[CSVParserBase] = [
+    IdemitsuParser(),
+]
+
+
+def detect_parser(lines: Iterable[str]) -> CSVParserBase | None:
+    for line in lines:
+        for parser in PARSERS:
+            if parser.detect(line):
+                return parser
+    return None
+
+
+def get_parser(lines: Iterable[str]) -> CSVParserBase:
+    parser = detect_parser(lines)
+    if parser is None:
+        raise ValueError('CSVブランドを判定できませんでした。')
+    return parser

expenses/csv_parsers/idemitsu.py

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+from __future__ import annotations
+
+import csv
+import hashlib
+from datetime import datetime
+from typing import Iterable
+
+from .base import CSVParserBase, ExpenseRow
+
+
+class IdemitsuParser(CSVParserBase):
+    source = 'idemitsu'
+
+    def detect(self, header_line: str) -> bool:
+        return '出光' in header_line or 'ａｐｏｌｌｏｓｔａｔｉｏｎ' in header_line
+
+    def parse(self, lines: Iterable[str]) -> list[ExpenseRow]:
+        rows: list[ExpenseRow] = []
+        reader = csv.reader(lines)
+        last_row_index: int | None = None
+        for columns in reader:
+            if not columns:
+                continue
+            head = columns[0].strip()
+            if head in ('カード名称', 'お支払日', '今回ご請求額'):
+                continue
+            if head == '利用日':
+                continue
+            if not head:
+                if last_row_index is not None:
+                    extra_desc = columns[1].strip() if len(columns) > 1 else ''
+                    extra_note = columns[6].strip() if len(columns) > 6 else ''
+                    if extra_desc:
+                        rows[last_row_index].description += f' {extra_desc}'
+                    if extra_note:
+                        if rows[last_row_index].note:
+                            rows[last_row_index].note += f' {extra_note}'
+                        else:
+                            rows[last_row_index].note = extra_note
+                continue
+            if len(columns) < 6:
+                continue
+            try:
+                use_date = datetime.strptime(head, '%Y/%m/%d').date()
+            except ValueError:
+                continue
+            description = columns[1].strip()
+            amount_text = columns[5].replace(',', '').strip()
+            note = columns[6].strip() if len(columns) > 6 else ''
+            try:
+                amount = int(amount_text)
+            except ValueError:
+                continue
+            raw = f"{use_date.isoformat()}|{description}|{amount}|{note}|{self.source}"
+            source_hash = hashlib.sha256(raw.encode('utf-8')).hexdigest()
+            rows.append(
+                ExpenseRow(
+                    use_date=use_date,
+                    description=description,
+                    amount=amount,
+                    note=note,
+                    source=self.source,
+                    source_hash=source_hash,
+                )
+            )
+            last_row_index = len(rows) - 1
+        return rows