Add CSV format support

Closes #5

redmine_reporter/cli.py

@@ -7,6 +7,7 @@ from .config import Config
 from .client import fetch_issues_with_spent_time
 from .formatter import format_compact, format_table
 from .formatter_odt import format_odt
+from .formatter_csv import format_csv
 
 
 def parse_date_range(date_arg: str) -> tuple[str, str]:
@@ -75,25 +76,35 @@ def main(argv: Optional[List[str]] = None) -> int:
     print(f"✅ Total issues: {len(issue_hours)} [{args.date}]")
 
     if args.output:
-        if not args.output.endswith(".odt"):
-            print("❌ Output file must end with .odt", file=sys.stderr)
+        if not (args.output.endswith(".odt") or args.output.endswith(".csv")):
+            print("❌ Output file must end with .odt or .csv", file=sys.stderr)
             return 1
-        try:
-            doc = format_odt(
-                issue_hours,
-                author=Config.get_author(args.author),
-                from_date=from_date,
-                to_date=to_date,
-                fill_time=not args.no_time
-            )
 
-            doc.save(args.output)
+        try:
+            if args.output.endswith(".odt"):
+                doc = format_odt(
+                    issue_hours,
+                    author=Config.get_author(args.author),
+                    from_date=from_date,
+                    to_date=to_date,
+                    fill_time=not args.no_time
+                )
+                doc.save(args.output)
+            elif args.output.endswith(".csv"):
+                csv_content = format_csv(issue_hours, fill_time=not args.no_time)
+                with open(args.output, "w", encoding="utf-8", newline="") as f:
+                    f.write(csv_content)
+
             print(f"✅ Report saved to {args.output}")
-        except ImportError:
-            print("❌ odfpy is not installed. Install with: pip install odfpy", file=sys.stderr)
+        except ImportError as e:
+            if args.output.endswith(".odt"):
+                print("❌ odfpy is not installed. Install with: pip install odfpy", file=sys.stderr)
+            else:
+                print(f"❌ Import error: {e}", file=sys.stderr)
             return 1
         except Exception as e:
-            print(f"❌ ODT export error: {e}", file=sys.stderr)
+            fmt = "ODT" if args.output.endswith(".odt") else "CSV"
+            print(f"❌ {fmt} export error: {e}", file=sys.stderr)
             return 1
     else:
         try: