font/py/build_font.py

#!/usr/bin/env fontforge
"""
Build aifont.ttf:
- Base: Meslo LGS NF Regular
- Replace A-Z with arch-cut versions
- Replace 0-9 with arch-cut versions
- Replace a, i, o, s with custom ai-world designs
- Keep everything else (other lowercase, symbols, nerd font icons)
"""
import fontforge
import os

BASE_FONT = "/tmp/MesloLGS NF Regular.ttf"
UPPER_DIR = "/tmp/aifont_build/upper"
DIGIT_DIR = "/tmp/aifont_build/digit"
LOWER_DIR = "/tmp/aifont_build/lower"
OUTPUT = "/tmp/aifont.ttf"

font = fontforge.open(BASE_FONT)

# Replace uppercase A-Z
for c in range(ord('A'), ord('Z')+1):
    g = chr(c)
    svg = os.path.join(UPPER_DIR, g + ".svg")
    if os.path.exists(svg):
        glyph = font[c]
        w = glyph.width
        glyph.clear()
        glyph.importOutlines(svg)
        glyph.width = w
        glyph.correctDirection()
        print("Upper: " + g)

# Replace digits 0-9
for c in range(ord('0'), ord('9')+1):
    g = chr(c)
    svg = os.path.join(DIGIT_DIR, g + ".svg")
    if os.path.exists(svg):
        glyph = font[c]
        w = glyph.width
        glyph.clear()
        glyph.importOutlines(svg)
        glyph.width = w
        glyph.correctDirection()
        print("Digit: " + g)

# Replace lowercase a, i, o, s
# These have different coordinate systems, so center them after import
import psMat

for g in ['a', 'i']:
    c = ord(g)
    svg = os.path.join(LOWER_DIR, g + ".svg")
    if os.path.exists(svg):
        glyph = font[c]
        target_w = glyph.width
        glyph.clear()
        glyph.importOutlines(svg)
        glyph.removeOverlap()
        glyph.correctDirection()
        glyph.simplify()
        glyph.round()

        # Get bounding box and center horizontally
        bb = glyph.boundingBox()
        xmin, ymin, xmax, ymax = bb
        glyph_w = xmax - xmin
        glyph_h = ymax - ymin

        # Scale per glyph
        if g == 'i':
            target_h = 1500
        elif g == 'a':
            target_h = 1400
        else:
            target_h = 1200
        if glyph_h > 0:
            scale = target_h / glyph_h
            glyph.transform(psMat.scale(scale))
            bb = glyph.boundingBox()
            xmin, ymin, xmax, ymax = bb
            glyph_w = xmax - xmin

        # For 'i': slight horizontal stretch to reduce side margins
        if g == 'i' and glyph_w > 0:
            stretch = (target_w * 0.3) / glyph_w
            if stretch > 1.0:
                cx = (xmin + xmax) / 2.0
                glyph.transform(psMat.compose(
                    psMat.translate(-cx, 0),
                    psMat.compose(
                        psMat.scale(stretch, 1.0),
                        psMat.translate(cx, 0)
                    )
                ))
                bb = glyph.boundingBox()
                xmin, ymin, xmax, ymax = bb
                glyph_w = xmax - xmin

        # Center horizontally within the glyph width
        x_offset = (target_w - glyph_w) / 2.0 - xmin
        # Align baseline
        y_offset = -ymin
        glyph.transform(psMat.translate(x_offset, y_offset))
        glyph.width = target_w

        # Thin down a, o, s (not i) - scale horizontally to 75%
        if g in ['a', 'o', 's']:
            bb = glyph.boundingBox()
            xmin, ymin, xmax, ymax = bb
            cx = (xmin + xmax) / 2.0
            # Scale X to 75%, keep Y
            glyph.transform(psMat.compose(
                psMat.translate(-cx, 0),
                psMat.compose(
                    psMat.scale(0.75, 1.0),
                    psMat.translate(cx, 0)
                )
            ))
            # Re-center
            bb = glyph.boundingBox()
            xmin, ymin, xmax, ymax = bb
            glyph_w = xmax - xmin
            x_offset = (target_w - glyph_w) / 2.0 - xmin
            glyph.transform(psMat.translate(x_offset, 0))
            glyph.width = target_w

        print("Lower: " + g)

# Re-import custom icons at E001-E003 (same approach as original aifont.py)
# Build icon font separately, then merge
ICON_DIR = "/tmp/aifont_build"
scale = 200  # same as original

icons_font = fontforge.font()
icons_font.em = 1024

for cp, name, has_yshift in [(0xE001, "ai.svg", False), (0xE002, "syui.svg", False), (0xE003, "bluesky.svg", True)]:
    svg = os.path.join(ICON_DIR, name)
    if os.path.exists(svg):
        glyph = icons_font.createChar(cp, name.replace(".svg", ""))
        glyph.importOutlines(svg)
        if has_yshift:
            bb = glyph.boundingBox()
            yshift = -bb[1]
            glyph.transform((1, 0, 0, 1, 0, yshift))
        s = scale / 100.0
        glyph.transform((s, 0, 0, s, 0, 0))
        glyph.width = 1024
        print("Icon: " + name)

icons_font.generate("/tmp/aifont_icons.ttf")
icons_font.close()

# Clear existing icon slots and merge
for cp in [0xE001, 0xE002, 0xE003]:
    font.selection.select(cp)
    font.clear()
font.selection.none()
font.mergeFonts("/tmp/aifont_icons.ttf")

# Set font metadata
font.fontname = "aifont"
font.familyname = "aifont"
font.fullname = "aifont"
font.appendSFNTName("English (US)", "Family", "aifont")
font.appendSFNTName("English (US)", "SubFamily", "Regular")
font.appendSFNTName("English (US)", "UniqueID", "aifont-regular")
font.appendSFNTName("English (US)", "Fullname", "aifont")
font.appendSFNTName("English (US)", "PostScriptName", "aifont")
font.appendSFNTName("English (US)", "Preferred Family", "aifont")
font.appendSFNTName("English (US)", "Preferred Styles", "Regular")

font.generate(OUTPUT)
print("\nDone: " + OUTPUT)