whatstyle.py 文件源码

def which(program):
    # type: (str) -> Optional[str]
    program = exename(program)
    fpath, _ = os.path.split(program)
    if fpath:
        if is_executable(program):
            return program
    else:
        for path in [os.path.abspath(os.curdir)] + os.environ['PATH'].split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(unifilename(path), unifilename(program))
            if is_executable(exe_file):
                return exe_file

    return None

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