#!/usr/bin/python
# Remove older versions of things from garchive directories.

import os, stat, re, sys, getopt
from garstowlib.utils import *

arc_re = re.compile(r'^([A-Za-z0-9_+-]+)-([0-9\.]+[0-9a-z]*(?:-rc[0-9]+)?)\.(?:tar\.gz|tar\.bz2|zip)$')
sig_re = re.compile(r'^(.*)\.(?:sig|asc|sign)$')
def garchive_clean(dir, dryrun):
	files = {}
	for entry in os.listdir(dir):
		if stat.S_ISREG(os.stat(dir + "/" + entry).st_mode):
			files[entry] = True
	remove = {}

	# Find files where a newer version exists.
	found = {}
	for entry in files.keys():
		m = arc_re.match(entry)
		if not m:
			continue
		(name, version) = m.group(1, 2)
		version = parse_version(version)
		l = found.setdefault(name, [])
		l.append((version, entry))
	for l in found.values():
		l.sort()
		for (version, entry) in l[:-1]:
			remove[entry] = l[-1][1] + " is newer"

	# Look for signature files where the file they sign no longer exists.
	for entry in files.keys():
		m = sig_re.match(entry)
		if not m:
			continue
		sentry = m.group(1)
		if (sentry not in files) or (sentry in remove):
			remove[entry] = sentry + " does not exist"

	rentries = remove.keys()
	rentries.sort()
	for entry in rentries:
		if dryrun:
			action = "Would remove"
		else:
			action = "Removed"
			os.unlink(dir + "/" + entry)
		print action + " " + entry + " because " + remove[entry]

if __name__ == "__main__":
	dryrun = False

	(opts, args) = getopt.getopt(sys.argv[1:], "n")
	for (o, a) in opts:
		if o == "-n":
			dryrun = True
		else:
			die("unknown argument: " + o)

	for dir in args:
		garchive_clean(dir, dryrun)