1#!/bin/bash
2
3dir=`mktemp -d`
4
5out=/dev/stdout
6if test "x$1" == 'x-o'; then
7	shift
8	out=$1
9	shift
10fi
11hb_shape=$1
12shift
13fontfile=$1
14if test "x${fontfile:0:1}" == 'x-'; then
15	echo "Specify font file before other options." >&2
16	exit 1
17fi
18shift
19if ! echo "$hb_shape" | grep -q 'hb-shape'; then
20	echo "Specify hb-shape (not hb-view, etc): got "$hb_shape"." >&2
21	exit 1
22fi
23options=
24have_text=false
25for arg in "$@"; do
26	if test "x${arg:0:1}" == 'x-'; then
27		if echo "$arg" | grep -q ' '; then
28			echo "Space in argument is not supported: '$arg'." >&2
29			exit 1
30		fi
31		options="$options${options:+ }$arg"
32		continue
33	fi
34	if $have_text; then
35		echo "Too many arguments found...  Use '=' notation for options: '$arg'" >&2
36		exit 1;
37	fi
38	text="$arg"
39	have_text=true
40done
41if ! $have_text; then
42	text=`cat`
43fi
44unicodes=`echo "$text" | ./hb-unicode-decode`
45glyphs=`echo "$text" | $hb_shape $options "$fontfile"`
46if test $? != 0; then
47	echo "hb-shape failed." >&2
48	exit 2
49fi
50glyph_ids=`echo "$text" | $hb_shape $options --no-glyph-names --no-clusters --no-positions "$fontfile" | sed 's/[][]//g; s/|/,/g'`
51
52cp "$fontfile" "$dir/font.ttf"
53echo fonttools subset \
54	--glyph-names \
55	--no-hinting \
56	--layout-features='*' \
57	"$dir/font.ttf" \
58	--gids="$glyph_ids" \
59	--text="$text"
60fonttools subset \
61	--glyph-names \
62	--no-hinting \
63	--layout-features='*' \
64	"$dir/font.ttf" \
65	--gids="$glyph_ids" \
66	--text="$text"
67if ! test -s "$dir/font.subset.ttf"; then
68	echo "Subsetter didn't produce nonempty subset font in $dir/font.subset.ttf" >&2
69	exit 2
70fi
71
72# Verify that subset font produces same glyphs!
73glyphs_subset=`echo "$text" | $hb_shape $options "$dir/font.subset.ttf"`
74
75if ! test "x$glyphs" = "x$glyphs_subset"; then
76	echo "Subset font produced different glyphs!" >&2
77	echo "Perhaps font doesn't have glyph names; checking visually..." >&2
78	hb_view=${hb_shape/shape/view}
79	echo "$text" | $hb_view $options "$dir/font.ttf" --output-format=png --output-file="$dir/orig.png"
80	echo "$text" | $hb_view $options "$dir/font.subset.ttf" --output-format=png --output-file="$dir/subset.png"
81	if ! cmp "$dir/orig.png" "$dir/subset.png"; then
82		echo "Images differ.  Please inspect $dir/*.png." >&2
83		echo "$glyphs" >> "$out"
84		echo "$glyphs_subset" >> "$out"
85		exit 2
86	fi
87	echo "Yep; all good." >&2
88	rm -f "$dir/orig.png"
89	rm -f "$dir/subset.png"
90	glyphs=$glyphs_subset
91fi
92
93sha1sum=`sha1sum "$dir/font.subset.ttf" | cut -d' ' -f1`
94subset="data/in-house/fonts/$sha1sum.ttf"
95mv "$dir/font.subset.ttf" "$subset"
96
97# There ought to be an easier way to do this, but it escapes me...
98unicodes_file=`mktemp`
99glyphs_file=`mktemp`
100echo "$unicodes" > "$unicodes_file"
101echo "$glyphs" > "$glyphs_file"
102# Open the "file"s
103exec 3<"$unicodes_file"
104exec 4<"$glyphs_file"
105relative_subset="$subset"
106if test "$out" != "/dev/stdout"; then
107	relative_subset="$(/usr/bin/python -c 'import os, sys; print (os.path.relpath (sys.argv[1], sys.argv[2]))' "$subset" "$(dirname "$out")")"
108fi
109while read uline <&3 && read gline <&4; do
110	echo "$relative_subset:$options:$uline:$gline" >> "$out"
111done
112
113
114rm -f "$dir/font.ttf"
115rmdir "$dir"
116