add commit messages

[feat] add new messages and then get then store them as commit templates

git_changes.py

@@ -1,7 +1,93 @@
 from __future__ import annotations
 
+import argparse
+import os
+import stat
+import sys
+from pathlib import Path
+
+
+GIT_DIR = Path('.git')
+GIT_COMMIT_MSG_FILE = GIT_DIR / 'current_message.txt'
+GIT_COMMIT_MSG_FILE_BK = GIT_DIR / 'current_message.txt.bk'
+GIT_POST_COMMIT_FILE = GIT_DIR / 'hooks/post-commit'
+
+COMMIT_TYPES = [
+    'feat',
+    'fix',
+    'docs',
+    'style',
+    'refactor',
+    'perf',
+    'test',
+    'build',
+    'ci',
+    'chore',
+    'revert',
+]
+
+
+def _write_post_commit_file() -> None:
+    with open(GIT_POST_COMMIT_FILE, 'w') as f:
+        f.write('#!/bin/env bash\ngitc --reset')
+
+    os.chmod(GIT_POST_COMMIT_FILE, os.stat(GIT_POST_COMMIT_FILE).st_mode | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)
+
+
+def _init() -> None:
+    GIT_COMMIT_MSG_FILE.touch()
+    _write_post_commit_file()
+
+
+def _add_msg_to_file(message: str, type: str) -> str:
+    msg = f'[{type}] {message}'
+    with open(GIT_COMMIT_MSG_FILE, 'a') as f:
+        f.write(f'{msg}\n')
+
+    return msg
+
+
+def _print_commit_msg() -> None:
+    with open(GIT_COMMIT_MSG_FILE, 'r') as f:
+        print(f.read().strip() or 'No commit messages yet!.. To add new message run\ngitc <message> [--type]')
+
+
+def _reset_commit_msg_file() -> None:
+    GIT_COMMIT_MSG_FILE.write_text('')
+
 
 def main() -> int:
-    print('Hello world')
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument('message', help='message for the change', nargs='?')
+
+    grp = parser.add_mutually_exclusive_group()
+    grp.add_argument('--type', choices=COMMIT_TYPES, default='feat', help='The type of the change')
+    grp.add_argument('--init', action='store_true', help='Initialize everything')
+    grp.add_argument('--show-msg', action='store_true', help='Show the current commit message')
+    grp.add_argument('--reset', action='store_true', help='reset commit messages')
+
+    args = parser.parse_args()
+
+    if not GIT_DIR.exists() or not GIT_DIR.is_dir():
+        print('error: not a git repository', file=sys.stderr)
+        return 1
+
+    if args.init:
+        _init()
+        os.execvp('git', ('git', 'config', '--local', 'commit.template', GIT_COMMIT_MSG_FILE))
+
+    if args.show_msg:
+        _print_commit_msg()
+        return 0
+
+    if args.reset:
+        _reset_commit_msg_file()
+        return 0
+
+    _init()
+
+    if args.message:
+        print(_add_msg_to_file(args.message, args.type))
 
     return 0