font patcher

rename_font_fam.py

from fontTools.ttLib import TTFont
import os


def rename_font_family(input_path, output_path, old_family="M+1", new_family="M+11"):
    font = TTFont(input_path)
    name_table = font["name"]

    print(name_table)

    for record in name_table.names:
        old_value = record.string.decode(record.getEncoding(), errors="replace")

        if old_family in old_value:
            new_value = old_value.replace(old_family, new_family)
            record.string = new_value.encode(record.getEncoding())
            print(f"Updated: {old_value} → {new_value}")

    # Update filename
    os.makedirs(os.path.dirname(output_path), exist_ok=True)
    font.save(output_path)
    font.close()
    print(f"Saved renamed font to: {output_path}")


def bulk_rename_fonts(input_dir, output_dir, old_family="M+1", new_family="M+11"):
    for root, _, files in os.walk(input_dir):
        for filename in files:
            if filename.lower().endswith((".ttf", ".otf")):
                input_path = os.path.join(root, filename)
                rel_path = os.path.relpath(input_path, input_dir)
                output_path = os.path.join(output_dir, rel_path)
                rename_font_family(input_path, output_path, old_family, new_family)


# Example usage:
input_folder = "/Users/darksied/Downloads/MPlus/M+11"
output_folder = f"{input_folder}/renames"
bulk_rename_fonts(input_folder, output_folder)