Create a custom font file and copy missing glyphs from source font.

merge_fonts.py

import fontforge

# Open the source and target fonts
source_font = fontforge.open("fa-brands-400.ttf")
target_font = fontforge.open("original.ttf")

# Define the list of missing glyphs (for simplicity, you can define them manually)
missing_glyphs = ["x-twitter", "square-x-twitter"]  # Add your missing glyphs here

# Iterate over each missing glyph
for glyph_name in missing_glyphs:
    # Check if the glyph exists in the source font
    if glyph_name in source_font:
        source_glyph = source_font[glyph_name]

        # Check if the glyph exists in the target font
        if glyph_name not in target_font:
            # Create new character in target font if it doesn't exist
            target_font.createChar(source_glyph.unicode, glyph_name)

        # Now we ensure the glyph exists in the target font
        target_glyph = target_font[glyph_name]

        # Clear existing outlines in the target glyph (if any)
        target_glyph.clear()

        source_glyph.export(f"{glyph_name}.svg")

        # Copy outlines from the source glyph to the target glyph
        target_glyph.importOutlines(
            f"{glyph_name}.svg"
        )  # Export source glyph to SVG, then import

        print(f"Glyph {glyph_name} fully added/updated in target font.")

# Save the target font with updated glyphs
target_font.save("FontAwesome.font")
final_font = fontforge.open("FontAwesome.font")
final_font.generate("FontAwesome.ttf")
print("Generated FontAwesome.ttf with added glyphs.")

# Close the fonts
source_font.close()
target_font.close()
final_font.close()

notes.md

Notes

fontforge -lang=py -c "
import fontforge

# Open the font file
font = fontforge.open('FontAwesome.ttf')

# List of glyph names to filter
target_glyphs = ['x-twitter', 'square-x-twitter']

# Loop over all glyphs
for glyph in font.glyphs():
    name = glyph.glyphname  # Get the name of the current glyph
    if name in target_glyphs:  # Check if the name matches one of the target names
        unicode = glyph.unicode  # Get the Unicode of the current glyph
        if unicode != -1:  # Only process glyphs that have a Unicode value
            print(f'Glyph {name} has Unicode U+{unicode:04X}')  # Print name and Unicode in hexadecimal

# Close the font
font.close()
"


fontforge -lang=py -script merge_fonts.py