#!/usr/bin/env python3

"""
Traversing directories and archives with AVFS/fuse
"""

import os
import os.path
import subprocess
import stat

avfs_sys_mount = os.environ['HOME'] + '/.avfs'	
avfs_started = False

def sys_name(fpath):
	global avfs_started
	if not avfs_started:
		subprocess.check_call(['mountavfs'])
		avfs_started = True
	return avfs_sys_mount + os.path.abspath(fpath)

def exists(fpath):
	return os.path.exists(sys_name(fpath))

def isdir(fpath):
	return os.path.isdir(sys_name(fpath))

orig_open = open
def open(fpath, *pargs, **kwargs):
	return orig_open(sys_name(fpath), *pargs, **kwargs)

# AVFS has its own automatic view selection using file extensions, but it
# includes plugins (like #patch) that will lead us into an infinite loop
# if we try to do a directory traversal.  Also, there are a few
# extensions we want to add.

avfscmds = {
	('.gz', '#ugz'),
	('.tgz', '#ugz#utar'),
	('.tar.bz2', '#ubz2#utar'),
	('.bz2', '#ubz2'),
	('.bz', '#ubz2'),
	('.tbz2', '#ubz2#utar'),
	('.tbz', '#ubz2#utar'),
	('.Z', '#uz'),
	('.tpz', '#uz#utar'),
	('.tz', '#uz#utar'),
	('.taz', '#uz#utar'),
	('.a', '#uar'),
	('.deb', '#uar'),
	('.tar', '#utar'),
	('.gem', '#utar'),    # Add upstream
	('.rar', '#urar'),
	('.sfx', '#urar'),
	('.zip', '#uzip'),
	('.jar', '#uzip'),
	('.ear', '#uzip'),
	('.war', '#uzip'),
	('.nupkg', '#uzip'),  # Add upstream
	('.whl', '#uzip'),    # Add upstream
	('.7z', '#u7z'),
	('.zoo', '#uzoo'),
	('.lha', '#ulha'),
	('.lhz', '#ulha'),
	('.arj', '#uarj'),
	('.cpio', '#ucpio'),
	('.rpm', '#rpm'),
	('.tar.xz', '#uxze#utar'),
	('.txz', '#uxze#utar'),
	('.xz', '#uxze'),
	('.lzma', '#uxze'),
}

def guesscmd(filename):
	for ext, cmd in avfscmds:
		if filename.endswith(ext):
			return cmd + guesscmd(filename[:-len(ext)])
	return ''

def get_lstat_mode(filename):
	"""
	Get the st_mode stat value of the given file, or None if the stat fails
	(doesn't exist, I/O error)
	"""
	try:
		return os.lstat(filename).st_mode
	except:
		return None

def find(path, excludes):
	"""
	Recursively list all files under path, including files in archives
	supported by AVFS.
	"""
	sys_path = sys_name(path)
	name = os.path.basename(path)
	mode = get_lstat_mode(sys_path)

	if name in excludes:
		return

	# If AVFS provides a cooked view of the file, substitute the view
	# for the original file.
	if stat.S_ISREG(mode):
		cmd = guesscmd(name)
		if cmd:
			cmd_mode = get_lstat_mode(sys_path + cmd)
			if cmd_mode is not None:
				path = path + cmd
				sys_path = sys_path + cmd
				name = name + cmd
				mode = cmd_mode

	if stat.S_ISDIR(mode):
		for entry in os.listdir(sys_path):
			yield from find(path + '/' + entry, excludes)
	elif stat.S_ISREG(mode):
		yield path

if __name__ == "__main__":
	import sys
	for f in find(sys.argv[1], {'.git'}):
		print(f)