bash completion not working in git-for-windows

[liooil]

Environment:

• Python version: 3.8.10
• Click version: 8.1.3
• Git for Windows version: 2.39.2
• Bash version: 5.2.12(1)-release

Step to replicate:

1. build a command line executable aaa.exe with click
2. add eval "$(_CCM_COMPLETE=bash_source ccm)" to ~/.bashrc
3. start a new bash session
4. see error reported

Error reported:

e/bin/bash: -c: line 0: syntax error near unexpected token `('
/bin/bash: -c: line 0: `echo 5.2.12(1)-release'
Traceback (most recent call last):
  File "C:\Python38\lib\runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Python38\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Python38\Scripts\aaa.exe\__main__.py", line 7, in <module>
  File "C:\Python38\lib\site-packages\click\core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File "C:\Python38\lib\site-packages\click\core.py", line 1050, in main
    self._main_shell_completion(extra, prog_name, complete_var)
  File "C:\Python38\lib\site-packages\click\core.py", line 1125, in _main_shell_completion
    rv = shell_complete(self, ctx_args, prog_name, complete_var, instruction)
  File "C:\Python38\lib\site-packages\click\shell_completion.py", line 45, in shell_complete
    echo(comp.source())
  File "C:\Python38\lib\site-packages\click\shell_completion.py", line 326, in source
    self._check_version()
  File "C:\Python38\lib\site-packages\click\shell_completion.py", line 321, in _check_version
    raise RuntimeError(
RuntimeError: Couldn't detect Bash version, shell completion is not supported.

[davidism]

Nice catch, and thanks for the PR.