Tighten configuration and export handling

redmine_reporter/cli.py

@@ -1,12 +1,14 @@
-import os
-import sys
 import argparse
+import os
+import re
+import sys
+from datetime import datetime
 from typing import List, Optional
 
-from .config import Config
 from .client import fetch_issues_with_spent_time
+from .config import Config
+from .formatters.factory import get_console_formatter, get_formatter_by_extension
 from .report_builder import build_grouped_report
-from .formatters.factory import get_formatter_by_extension, get_console_formatter
 
 
 def parse_date_range(date_arg: str) -> tuple[str, str]:
@@ -15,7 +17,22 @@ def parse_date_range(date_arg: str) -> tuple[str, str]:
     parts = date_arg.split("--", 1)
     if len(parts) != 2:
         raise ValueError("Invalid date range format")
-    return parts[0].strip(), parts[1].strip()
+
+    from_date, to_date = parts[0].strip(), parts[1].strip()
+    date_pattern = r"\d{4}-\d{2}-\d{2}"
+    if not re.fullmatch(date_pattern, from_date) or not re.fullmatch(date_pattern, to_date):
+        raise ValueError("Date range must be in format YYYY-MM-DD--YYYY-MM-DD")
+
+    try:
+        start = datetime.strptime(from_date, "%Y-%m-%d").date()
+        end = datetime.strptime(to_date, "%Y-%m-%d").date()
+    except ValueError as e:
+        raise ValueError("Date range contains invalid calendar date") from e
+
+    if start > end:
+        raise ValueError("Date range start must be less than or equal to end")
+
+    return start.isoformat(), end.isoformat()
 
 
 def main(argv: Optional[List[str]] = None) -> int:
@@ -36,7 +53,7 @@ def main(argv: Optional[List[str]] = None) -> int:
     )
     parser.add_argument(
         "--output",
-        help="Path to output .odt file (e.g., report.odt). If omitted, prints to stdout.",
+        help="Path to output file (.odt, .csv, .md, .html). If omitted, prints to stdout.",
     )
     parser.add_argument(
         "--author", default="", help="Override author name from .env (REDMINE_AUTHOR)"