Running pip without creating process

pip_hooker.py

'''
MIT License
Copyright (c) 2021 Pixelsuft
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
'''


import sys
from pip._internal.cli.main import main as pip_main


backup = (sys.argv, sys.exit)


def fake_exit(*args, **kwargs) -> None:
    pass


def hook_sys(args: tuple) -> None:
    sys.argv = list(args)
    sys.exit = fake_exit


def unhook_sys() -> None:
    sys.argv = backup[0]
    sys.exit = backup[1]


def parse_args(cmd_string: str) -> list:
    result_str = ''
    work = str(cmd_string).strip()
    can_pass_space = False
    for i in range(len(work)):
        if work[i] == '\"':
            if can_pass_space == False:
                can_pass_space = True
                result_str += '\n'
            else:
                can_pass_space = False
        elif work[i] == ' ':
            if can_pass_space == False:
                result_str += '\n'
            else:
                result_str += ' '
        else:
            result_str += work[i]
    result = []
    for i in result_str.split('\n'):
        if not i == '':
            result.append(i)
    return result


def check_cmd(cmd: list) -> list:
    result = cmd
    return result


def run_pip_command(cmd) -> any:
    if not cmd:
        return True
    if type(cmd) == str:
        cmd = parse_args(cmd)
    cmd = tuple(check_cmd(list(cmd)))
    hook_sys(cmd)
    error = None
    try:
        pip_main()
    except Exception as e:
        error = e
    unhook_sys()
    return error if error else False


def main() -> bool:
    try:
        while True:
            print('>>> ', end='')
            cmd = input()
            if not cmd.lower().strip():
                break
            result = run_pip_command(cmd)
            if result and not type(result) == bool:
                print(f'Error: {result}')
        return False
    except KeyboardInterrupt:
        return True


if __name__ == '__main__':
    print('Pip hooker by pixelsuft')
    if main():
        print('Ctrl+C Pressed, aborting...\n', end='')