Interrofont: Show various data about a font from the command line

interrofont.py

#!env python3
import sys
from fontTools.ttLib import TTFont
from argparse import ArgumentParser
import itertools

parser = ArgumentParser()
parser.add_argument("input",
                    help="font file to process", metavar="FILE")
parser.add_argument('-n', "--name", action='store_true',
                    help="Show font family name")
parser.add_argument('-v', "--version", action='store_true',
                    help="Show font version")
parser.add_argument('-c', "--count", action='store_true',
                    help="Show glyph count")
parser.add_argument('-g', "--glyphset", action='store_true',
                    help="Show glyph names")
parser.add_argument('-m', "--marks", action='store_true',
                    help="Show marks and bases")
parser.add_argument('-M', "--metrics", action='store_true',
                    help="Show glyph metrics")
parser.add_argument("--codepoints", action='store_true',
                    help="Show glyph codepoints")
parser.add_argument("--coverage", action='store_true',
                    help="Show Unicode coverage ranges")
parser.add_argument("--glyph-for", metavar='CHAR_OR_CODEPOINT', dest='glyphfor',
                    help="Show glyph name for given character or codepoint")
parser.add_argument("--all", action='store_true',
                    help="Show everything")

args = parser.parse_args()
font = TTFont(args.input)

cmap = font["cmap"].getBestCmap()
codepoints = list(cmap.keys())
glyphset = font.getGlyphOrder()
revcmap = font["cmap"].buildReversed()

if len(sys.argv) < 3:
	args.name = True
	args.version = True
	args.count = True

if args.codepoints or args.metrics: args.glyphset = True

if args.glyphfor:
	if args.glyphfor.startswith("U+") or args.glyphfor.startswith("0x"): g = int(args.glyphfor[2:],16)
	elif len(args.glyphfor) > 1: g = int(args.glyphfor,16)
	else: g = ord(args.glyphfor)
	if not (g in cmap): print("U+%04X: not in font" % g)
	else: print("U+%04X -> %s" % (g,cmap[g]))

def ranges(i):
    for a, b in itertools.groupby(enumerate(i), lambda pair: pair[1] - pair[0]):
        b = list(b)
        yield b[0][1], b[-1][1]

def categorize_glyph(font,glyphname):
    classdefs = font["GDEF"].table.GlyphClassDef.classDefs
    if not glyphname in classdefs: return ("base", None)
    if classdefs[glyphname] == 1: return ("base",None)
    if classdefs[glyphname] == 2: return ("ligature",None)
    if classdefs[glyphname] == 3:
        # Now find attachment class
        mclass = None
        if font["GDEF"].table.MarkAttachClassDef:
	        markAttachClassDef = font["GDEF"].table.MarkAttachClassDef.classDefs
	        mclass = markAttachClassDef[glyphname]
        return ("mark",mclass)
    if classdefs[glyphname] == 4: return ("component",None)

if args.name or args.all:
	print("Name: %s" % font["name"].getDebugName(1))

if args.version or args.all:
	print("Version: %s" % font["name"].getDebugName(5))

if args.count or args.all:
	print("Glyph count: %i" % len(glyphset))

if args.coverage or args.all:
	print("Codepoint coverage:")
	codepoints = list(cmap.keys())
	cplen = 4
	if list(filter(lambda x: x > 0xFFFF, codepoints)): cplen = 6
	def fmtcp(cp):
		return (("U+%0"+str(cplen)+"X") % cp)
	cp_ranges = ranges(codepoints)
	for s,e in cp_ranges:
		if s==e: print(fmtcp(s), end=" ")
		else:		 print(fmtcp(s)+"-"+fmtcp(e), end=" ")
	print()

if args.glyphset or args.all:
	print("Glyphs:")
	for ix, g in enumerate(glyphset):
		print("%12s" % g, end='')
		if args.marks or args.all:
			c,cx = categorize_glyph(font, g)
			if c == "mark": print("[´]", end='')
			if c == "base": print("   ", end='')
			if c == "ligature": print("[fi]", end='')
			if c == "component": print("[◌]", end='')
		if args.codepoints or args.all:
			if g in revcmap:
				for rc in revcmap[g]:
					print(" U+%04X" % rc, end='')
		if args.metrics or args.all:
			advance, lsb = font["hmtx"][g]
			print(" advance=%i lsb=%i" % (advance, lsb), end="")
		if not args.metrics and not args.codepoints and not args.all:
			if ix % 5 == 0:
				print("")
			else:
				print(" ", end='')
		else:
			print("")