#!/usr/bin/python

# Copyright (c) 2010 Benjamin Drung <bdrung@ubuntu.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

import getopt
import os
import subprocess
import sys

# error codes
COMMAND_LINE_SYNTAX_ERROR = 1

def remove_recursive(path):
	"""equivalent to rm -rf path"""
	if os.path.exists(path):
		for i in os.listdir(path):
			full_path = os.path.join(path, i)
			if os.path.isdir(full_path):
				remove_recursive(full_path)
			else:
				os.remove(full_path)
		os.rmdir(path)

def repack_xpi(script_name, package, upstream_version, xpi_file, verbose):
	# extract xpi file
	tmp_dir = "/tmp"
	extract_dir = package + "-" + upstream_version
	full_extract_dir = os.path.join(tmp_dir, extract_dir)
	remove_recursive(full_extract_dir)
	subprocess.check_call(["xpi-unpack", xpi_file, full_extract_dir])

	# check, if source 3.0 (quilt) format is used
	extension = ".gz"
	if os.path.isfile("debian/source/format"):
		source_format = open("debian/source/format").readline().strip()
		if source_format == "3.0 (quilt)":
			extension = ".bz2"

	# pack source
	tar_file = package + "_" + upstream_version + ".orig.tar"
	full_tar_file = os.path.realpath(os.path.join(os.path.dirname(xpi_file), tar_file))
	cmd = ["tar", "-ca", "-C", tmp_dir, "-f", full_tar_file + extension, extract_dir]
	if verbose:
		print " ".join(cmd)
	subprocess.check_call(cmd)

	# remove temporary directory
	remove_recursive(full_extract_dir)

def get_source_package_name():
	lines = open("debian/control").readlines()
	package_lines = filter(lambda x: x.find("Source:") >= 0, lines)
	packages = map(lambda x: x[x.find(":")+1:].strip(), package_lines)
	return packages[0]

def usage(output):
	print >> output, """Usage: %s [options] <xpi-file>

Options:
  -p, --package=<value>              specify source package name
  -u, --upstream-version=<version>   specify the upstream version

General options:
  -h, --help                   display this help and exit
  -v, --verbose                print more information

See %s(1) for more info.""" % (os.path.basename(sys.argv[0]), os.path.basename(sys.argv[0]))

if __name__ == "__main__":
	try:
		long_opts = ["help", "package=", "upstream-version=", "verbose"]
		opts, args = getopt.gnu_getopt(sys.argv[1:], "hp:u:v", long_opts)
	except getopt.GetoptError, e:
		# will print something like "option -a not recognized"
		print >> sys.stderr, str(e)
		usage(sys.stderr)
		sys.exit(COMMAND_LINE_SYNTAX_ERROR)

	package = None
	upstream_version = None
	verbose = False

	for o, a in opts:
		if o in ("-h", "--help"):
			usage(sys.stdout)
			sys.exit()
		elif o in ("-u", "--upstream-version"):
			upstream_version = a
		elif o in ("-p", "--package"):
			package = a
		elif o in ("-v", "--verbose"):
			verbose = True
		else:
			assert False, "unhandled option"

	if package is None:
		package = get_source_package_name()

	script_name = os.path.basename(sys.argv[0])

	if len(args) == 0:
		print >> sys.stderr, "%s: Error: No xpi file specified." % (script_name)
		sys.exit(COMMAND_LINE_SYNTAX_ERROR)
	elif len(args) > 1:
		print >> sys.stderr, script_name + ": Error: Multiple xpi files specified: " + ", ".join(args)
		sys.exit(COMMAND_LINE_SYNTAX_ERROR)

	repack_xpi(script_name, package, upstream_version, args[0], verbose)