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#!/usr/bin/env python
"""
# OpenWrt download directory cleanup utility.
# Delete all but the very last version of the program tarballs.
#
# Copyright (C) 2010 Michael Buesch <mb@bu3sch.de>
# Copyright (C) 2013 OpenWrt.org
"""

import sys
import os
import re
import getopt

# Commandline options
opt_dryrun = False


def parseVer_1234(match, filepath):
	progname = match.group(1)
	progversion = (int(match.group(2)) << 64) |\
		      (int(match.group(3)) << 48) |\
		      (int(match.group(4)) << 32) |\
		      (int(match.group(5)) << 16)
	return (progname, progversion)

def parseVer_123(match, filepath):
	progname = match.group(1)
	try:
		patchlevel = match.group(5)
	except (IndexError), e:
		patchlevel = None
	if patchlevel:
		patchlevel = ord(patchlevel[0])
	else:
		patchlevel = 0
	progversion = (int(match.group(2)) << 64) |\
		      (int(match.group(3)) << 48) |\
		      (int(match.group(4)) << 32) |\
		      patchlevel
	return (progname, progversion)

def parseVer_12(match, filepath):
	progname = match.group(1)
	try:
		patchlevel = match.group(4)
	except (IndexError), e:
		patchlevel = None
	if patchlevel:
		patchlevel = ord(patchlevel[0])
	else:
		patchlevel = 0
	progversion = (int(match.group(2)) << 64) |\
		      (int(match.group(3)) << 48) |\
		      patchlevel
	return (progname, progversion)

def parseVer_r(match, filepath):
	progname = match.group(1)
	progversion = (int(match.group(2)) << 64)
	return (progname, progversion)

def parseVer_ymd(match, filepath):
	progname = match.group(1)
	progversion = (int(match.group(2)) << 64) |\
		      (int(match.group(3)) << 48) |\
		      (int(match.group(4)) << 32)
	return (progname, progversion)

def parseVer_GIT(match, filepath):
	progname = match.group(1)
	st = os.stat(filepath)
	progversion = int(st.st_mtime) << 64
	return (progname, progversion)

extensions = (
	".tar.gz",
	".tar.bz2",
	".tar.xz",
	".orig.tar.gz",
	".orig.tar.bz2",
	".orig.tar.xz",
	".zip",
	".tgz",
	".tbz",
	".txz",
)

versionRegex = (
	(re.compile(r"(.+)[-_](\d+)\.(\d+)\.(\d+)\.(\d+)"), parseVer_1234),	# xxx-1.2.3.4
	(re.compile(r"(.+)[-_](\d\d\d\d)-?(\d\d)-?(\d\d)"), parseVer_ymd),	# xxx-YYYY-MM-DD
	(re.compile(r"(.+)[-_]([0-9a-fA-F]{40,40})"), parseVer_GIT),		# xxx-GIT_SHASUM
	(re.compile(r"(.+)[-_](\d+)\.(\d+)\.(\d+)(\w?)"), parseVer_123),	# xxx-1.2.3a
	(re.compile(r"(.+)[-_](\d+)_(\d+)_(\d+)"), parseVer_123),		# xxx-1_2_3
	(re.compile(r"(.+)[-_](\d+)\.(\d+)(\w?)"), parseVer_12),		# xxx-1.2a
	(re.compile(r"(.+)[-_]r?(\d+)"), parseVer_r),				# xxx-r1111
)

blacklist = [
	("linux",		re.compile(r"linux-.*")),
	("gcc",			re.compile(r"gcc-.*")),
	("wl_apsta",		re.compile(r"wl_apsta.*")),
	(".fw",			re.compile(r".*\.fw")),
	(".arm",		re.compile(r".*\.arm")),
	(".bin",		re.compile(r".*\.bin")),
	("rt-firmware",		re.compile(r"RT[\d\w]+_Firmware.*")),
]

class EntryParseError(Exception): pass

class Entry:
	def __init__(self, directory, filename):
		self.directory = directory
		self.filename = filename
		self.progname = ""
		self.fileext = ""

		for ext in extensions:
			if filename.endswith(ext):
				filename = filename[0:0-len(ext)]
				self.fileext = ext
				break
		else:
			print self.filename, "has an unknown file-extension"
			raise EntryParseError("ext")
		for (regex, parseVersion) in versionRegex: