#!/usr/bin/python
import ast
import os
import pipes
import re
import sys

first_arg_only_calls = {'read', 'write'}

re_filename = re.compile(r'"((?:[^"]|\\")*)"|\d<(.*?)>[,)]')

if len(sys.argv) <= 1 or sys.argv[1:] in (['--help'], ['-h']):
    sys.stderr.write('''\
usage: %s COMMAND

Shows all paths access by a command. Relative paths are resolved
relative to the working directory of tracepath, not actual command,
and are thus not guaranteed to be accurate if command changes directory.
''' % os.path.basename(sys.argv[0]))
    sys.exit(1)

if sys.argv[1:] == ['--internal-parse']:
    results = set()
    for line in sys.stdin:
        pid, line = line.split(None, 1)
        call, _, args = line.partition('(')
        if call in first_arg_only_calls:
            matches = [re_filename.search(args)]
        else:
            matches = re_filename.finditer(args)
        for m in matches:
            escaped = '"%s"' % (m.group(1) or m.group(2))
            try:
                string = ast.literal_eval(escaped)
                path = os.path.realpath(string)
            except Exception:
                results.add('%s: %s?!' % (call, escaped))
            else:
                results.add(path)
                #results.add('%s: %s' % (call, path))
    for path in sorted(results):
        sys.stderr.write('%s\n' % path)
    sys.exit(0)

cmd = 'strace -y -e trace=file,desc -e verbose=none -f'
cmd += ' -o %s' % pipes.quote('|%s --internal-parse' % pipes.quote(sys.argv[0]))
cmd += ' ' + ' '.join(map(pipes.quote, sys.argv[1:]))
sys.exit(os.system(cmd))