remove-katakana-glyphs.py

import fontforge
import argparse

KATAKANA_LOWER_BOUND = 0x30A0
KATAKANA_UPPER_BOUND = 0x30FF


def remove_katakana_glyphs(input: str, output: str):
    font = fontforge.open(input)
    for glyph in font.glyphs():
        point: int = glyph.unicode
        if KATAKANA_LOWER_BOUND <= point <= KATAKANA_UPPER_BOUND:
            font.removeGlyph(glyph)

    font.fontname += '-Without-Katakana'
    font.fullname += ' Without Katakana'

    font.generate(output)
    font.close()


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('input', nargs=1, help='path to input font file')
    parser.add_argument('output', nargs=1, help='path to output font file')
    args = parser.parse_args()
    input_file_path = args.input[0]
    output_file_path = args.output[0]

    remove_katakana_glyphs(input_file_path, output_file_path)

Example usage

 for file in *.otf; do python3 remove-katakana-glyphs.py ${file} modified/${file%.*}-Without-Katakana.otf &; done