🩹 fix(changelog): prepend new changelog entries if file exists

Author: Jannchie

CHANGELOG.md

@@ -1,3 +1,15 @@
+## v0.14.0
+
+[v0.13.2...v0.14.0](https://github.com/Jannchie/tgit/compare/v0.13.2...v0.14.0)
+
+### :sparkles: Features
+
+- **changelog**: add incremental changelog generation && support appending to existing file - By [Jianqi Pan](mailto:[email protected]) in [2d193a5](https://github.com/Jannchie/tgit/commit/2d193a5)
+
+### :adhesive_bandage: Fixes
+
+- **changelog**: remove head from default changelog range && update changelog entries - By [Jianqi Pan](mailto:[email protected]) in [f6509e3](https://github.com/Jannchie/tgit/commit/f6509e3)
+
 ## v0.13.2
 
 [v0.13.1...v0.13.2](https://github.com/Jannchie/tgit/compare/v0.13.1...v0.13.2)

tgit/changelog.py

@@ -288,9 +288,15 @@ def handle_changelog(args: ChangelogArgs) -> None:
                 changelogs += changelog
                 progress.update(task, advance=1)
         if changelogs:
-            mode = "a" if latest_tag_in_file else "w"
-            with Path(args.output).open(mode, encoding="utf-8") as output_file:
-                output_file.write(changelogs.strip("\n") + "\n")
+            if latest_tag_in_file:
+                # prepend: 新内容写在最前面
+                with Path(args.output).open("r", encoding="utf-8") as f:
+                    old_content = f.read()
+                with Path(args.output).open("w", encoding="utf-8") as f:
+                    f.write(changelogs.strip("\n") + "\n\n" + old_content)
+            else:
+                with Path(args.output).open("w", encoding="utf-8") as output_file:
+                    output_file.write(changelogs.strip("\n") + "\n")
         print()
         print(changelogs.strip("\n"))
         return