fix: add Windows support with entry_points and os.replace

- Replace os.rename() with os.replace() for atomic file operations
  on Windows (os.rename fails if destination exists on Windows)
- Add entry_points console_scripts for proper .exe generation on Windows
- Create github_backup/cli.py with main() entry point
- Add github_backup/__main__.py for python -m github_backup support
- Keep bin/github-backup as thin wrapper for backwards compatibility

Closes #112

bin/github-backup

@@ -1,76 +1,18 @@
 #!/usr/bin/env python
+"""
+Backwards-compatible wrapper script.
+
+The recommended way to run github-backup is via the installed command
+(pip install github-backup) or python -m github_backup.
+
+This script is kept for backwards compatibility with existing installations
+that may reference this path directly.
+"""
 
-import logging
-import os
 import sys
 
-from github_backup.github_backup import (
-    backup_account,
-    backup_repositories,
-    check_git_lfs_install,
-    filter_repositories,
-    get_auth,
-    get_authenticated_user,
-    logger,
-    mkdir_p,
-    parse_args,
-    retrieve_repositories,
-)
-
-# INFO and DEBUG go to stdout, WARNING and above go to stderr
-log_format = logging.Formatter(
-    fmt="%(asctime)s.%(msecs)03d: %(message)s",
-    datefmt="%Y-%m-%dT%H:%M:%S",
-)
-
-stdout_handler = logging.StreamHandler(sys.stdout)
-stdout_handler.setLevel(logging.DEBUG)
-stdout_handler.addFilter(lambda r: r.levelno < logging.WARNING)
-stdout_handler.setFormatter(log_format)
-
-stderr_handler = logging.StreamHandler(sys.stderr)
-stderr_handler.setLevel(logging.WARNING)
-stderr_handler.setFormatter(log_format)
-
-logging.basicConfig(level=logging.INFO, handlers=[stdout_handler, stderr_handler])
-
-
-def main():
-    args = parse_args()
-
-    if args.private and not get_auth(args):
-        logger.warning(
-            "The --private flag has no effect without authentication. "
-            "Use -t/--token, -f/--token-fine, or -u/--username to authenticate."
-        )
-
-    if args.quiet:
-        logger.setLevel(logging.WARNING)
-
-    output_directory = os.path.realpath(args.output_directory)
-    if not os.path.isdir(output_directory):
-        logger.info("Create output directory {0}".format(output_directory))
-        mkdir_p(output_directory)
-
-    if args.lfs_clone:
-        check_git_lfs_install()
-
-    if args.log_level:
-        log_level = logging.getLevelName(args.log_level.upper())
-        if isinstance(log_level, int):
-            logger.root.setLevel(log_level)
-
-    if not args.as_app:
-        logger.info("Backing up user {0} to {1}".format(args.user, output_directory))
-        authenticated_user = get_authenticated_user(args)
-    else:
-        authenticated_user = {"login": None}
-
-    repositories = retrieve_repositories(args, authenticated_user)
-    repositories = filter_repositories(args, repositories)
-    backup_repositories(args, output_directory, repositories)
-    backup_account(args, output_directory)
-
+from github_backup.cli import main
+from github_backup.github_backup import logger
 
 if __name__ == "__main__":
     try: