add zipapp support

[asottile]

seems to work!

$ ./pre-commit-2.7.1.pyz run flake8 --all-files
flake8...................................................................Passed

[asottile]

doesn't quite work on windows yet -- I probably need the shebang code here as well:

C:\Users\Anthony\workspace\babi>python E:\VMs\Ubuntu20.04_shared\pre-commit-2.7.1.pyz run --all-files
[INFO] Initializing environment for https://gitlab.com/pycqa/flake8.
[INFO] Initializing environment for https://gitlab.com/pycqa/flake8:flake8-typing-imports==1.7.0.
[INFO] Initializing environment for https://github.com/pre-commit/mirrors-autopep8.
[INFO] Initializing environment for https://github.com/asottile/reorder_python_imports.
[INFO] Initializing environment for https://github.com/asottile/pyupgrade.
[INFO] Initializing environment for https://github.com/asottile/setup-cfg-fmt.
[INFO] Installing environment for https://gitlab.com/pycqa/flake8.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
An unexpected error has occurred: CalledProcessError: command: ('C:\\Users\\Anthony\\.cache\\pre-commit-zipapp\\SuNk3yXatwvuqrztl46R2--u3qyqevT15p2e3M1XeSM\\fakepython', '-mvirtualenv', 'C:\\Users\\Anthony\\.cache\\pre-commit\\repo0di586bv\\py_env-python3.7', '-p', 'C:\\Users\\Anthony\\.cache\\pre-commit-zipapp\\SuNk3yXatwvuqrztl46R2--u3qyqevT15p2e3M1XeSM\\fakepython')
return code: 1
expected return code: 0
stdout:
    Executable `python3` not found
stderr: (none)
Check the log at C:\Users\Anthony\.cache\pre-commit\pre-commit.log

[asottile]

looks like this is going to need #1617 on windows :(

[asottile]

windows needs more work as well, probably need to write a shim python.bat (I couldn't get python.py via python to work for whatever reason -- though it works from cmd.exe)

[asottile]

looks like a .bat isn't going to work either, so I should probably attempt to do this with a .exe :(

almost everything works, like out.pyz run --all-files works fine and dandy

but running from git commit does not work on windows:

C:\Users\Anthony\workspace\babi>git commit -m "foo"
Traceback (most recent call last):
  File ".git/hooks/pre-commit", line 42, in <module>
    raise SystemExit(subprocess.call(CMD))
  File "C:\Python37\lib\subprocess.py", line 323, in call
    with Popen(*popenargs, **kwargs) as p:
  File "C:\Python37\lib\subprocess.py", line 775, in __init__
    restore_signals, start_new_session)
  File "C:\Python37\lib\subprocess.py", line 1178, in _execute_child
    startupinfo)
OSError: [WinError 193] %1 is not a valid Win32 application

and I feel like that's kinda important :)

[asottile]

made a shim .exe and it seems to work!