buildlist.py
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buildlist.py
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	# This Source Code Form is subject to the terms of the Mozilla Public
	# License, v. 2.0. If a copy of the MPL was not distributed with this
	# file, You can obtain one at http://mozilla.org/MPL/2.0/.

	'''A generic script to add entries to a file
	if the entry does not already exist.

	Usage: buildlist.py <filename> <entry> [<entry> ...]
	'''
	from __future__ import print_function

	import sys
	import os
	from utils import lockFile

	def addEntriesToListFile(listFile, entries):
	"""Given a file \|listFile\| containing one entry per line,
	add each entry in \|entries\| to the file, unless it is already
	present."""
	lock = lockFile(listFile + ".lck")
	try:
	if os.path.exists(listFile):
	f = open(listFile)
	existing = set(x.strip() for x in f.readlines())
	f.close()
	else:
	existing = set()
	f = open(listFile, 'a')
	for e in entries:
	if e not in existing:
	f.write("{0}\n".format(e))
	existing.add(e)
	f.close()
	finally:
	lock = None

	if __name__ == '__main__':
	if len(sys.argv) < 3:
	print("Usage: buildlist.py <list file> <entry> [<entry> ...]",
	file=sys.stderr)
	sys.exit(1)
	addEntriesToListFile(sys.argv[1], sys.argv[2:])