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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
"""A generic script to add entries to a file
if the entry does not already exist.
Usage: buildlist.py <filename> <entry> [<entry> ...]
"""
import io
import os
import sys
from mozbuild.dirutils import ensureParentDir
from mozbuild.lock import lock_file
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."""
ensureParentDir(listFile)
lock = lock_file(listFile + ".lck")
try:
if os.path.exists(listFile):
f = io.open(listFile)
existing = set(x.strip() for x in f.readlines())
f.close()
else:
existing = set()
for e in entries:
if e not in existing:
existing.add(e)
with io.open(listFile, "w", newline="\n") as f:
f.write("\n".join(sorted(existing)) + "\n")
finally:
del lock # Explicitly release the lock_file to free it
def main(args):
if len(args) < 2:
print("Usage: buildlist.py <list file> <entry> [<entry> ...]", file=sys.stderr)
return 1
return addEntriesToListFile(args[0], args[1:])
if __name__ == "__main__":
sys.exit(main(sys.argv[1:]))