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#!/usr/bin/env python
import argparse
from fontTools import ttLib
def update_font_revision(font, revisionSpec):
if revisionSpec.startswith('+'):
font['head'].fontRevision += float(revisionSpec[1:])
else:
font['head'].fontRevision = float(revisionSpec)
def main():
args_parser = argparse.ArgumentParser(description='Update font file metadata')
args_parser.add_argument('--input', help='Input otf/ttf font file.')
args_parser.add_argument('--output', help='Output file for updated font file.')
args_parser.add_argument('--revision', help='Updated font revision. Use + to update revision based on the current revision')
args = args_parser.parse_args()
font = ttLib.TTFont(args.input)
update_font_revision(font, args.revision)
font.save(args.output)
if __name__ == "__main__":
main()
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