#!/usr/bin/env python3

"""\
List all those script files that have executable bits and require shebang or
have shebang and require executable bits.

Usage: findnoshebang.py file-or-dir1 [file-or-dir2...]
"""

__author__ = 'Serhiy Storchaka'

import os
import re
import stat
import sys

suffixes = ('.py', '.pyw', '.sh')
shebang = b'#!'
execmode = stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH
is_text = re.compile(b'^[\t\n\v\f\r -\xff]+$').match
is_ignored_dir = re.compile(r'^\..+|^CVS$').match

def walk_scripts(paths):
    for path in paths:
        if os.path.isfile(path):
            yield path
        elif os.path.isdir(path):
            for root, dirs, files in os.walk(path):
                if is_ignored_dir(os.path.basename(root)):
                    del dirs[:]
                    continue
                for filename in files:
                    yield os.path.join(root, filename)

if __name__ == "__main__":
    for path in walk_scripts(sys.argv[1:]):
        try:
            mode = os.stat(path).st_mode
            with open(path, 'rb') as f:
                data = f.read(512)
        except OSError:
            pass
        hasshebang = data.startswith(shebang)
        if mode & execmode:
            if not hasshebang and is_text(data):
                print('x', path)
                pass
        else:
            if hasshebang and path.endswith(suffixes):
                print('-', path)