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#!/bin/bash
dir=`mktemp --directory`
hb_shape=$1
shift
fontfile=$1
if test "x${fontfile:0:1}" == 'x-'; then
echo "Specify font file before other options." >&2
exit 1
fi
shift
if ! echo "$hb_shape" | grep -q 'hb-shape'; then
echo "Specify hb-shape (not hb-view, etc)." >&2
exit 1
fi
options=
have_text=false
for arg in "$@"; do
if test "x${arg:0:1}" == 'x-'; then
if echo "$arg" | grep -q ' '; then
echo "Space in argument is not supported: '$arg'." >&2
exit 1
fi
options="$options${options:+ }$arg"
continue
fi
if $have_text; then
echo "Too many arguments found... Use '=' notation for options: '$arg'" >&2
exit 1;
fi
text="$arg"
have_text=true
done
if ! $have_text; then
text=`cat`
fi
unicodes=`echo "$text" | ./hb-unicode-decode`
glyphs=`echo "$text" | $hb_shape $options "$fontfile"`
if test $? != 0; then
echo "hb-shape failed." >&2
exit 2
fi
cp "$fontfile" "$dir/font.ttf"
pyftsubset \
--glyph-names \
--no-hinting \
"$dir/font.ttf" \
--text="$text"
if ! test -s "$dir/font.ttf.subset"; then
echo "Subsetter didn't produce nonempty subset font in $dir/font.ttf.subset" >&2
exit 2
fi
# Verify that subset font produces same glyphs!
glyphs_subset=`echo "$text" | $hb_shape $options "$dir/font.ttf.subset"`
if ! test "x$glyphs" = "x$glyphs_subset"; then
echo "Subset font produced different glyphs!" >&2
echo "Perhaps font doesn't have glyph names; checking visually..." >&2
hb_view=${hb_shape/shape/view}
echo "$text" | $hb_view $options "$dir/font.ttf" --output-format=png --output-file="$dir/orig.png"
echo "$text" | $hb_view $options "$dir/font.ttf.subset" --output-format=png --output-file="$dir/subset.png"
if ! cmp "$dir/orig.png" "$dir/subset.png"; then
echo "Images differ. Please inspect $dir/*.png." >&2
echo "$glyphs"
echo "$glyphs_subset"
exit 2
fi
echo "Yep; all good." >&2
rm -f "$dir/orig.png"
rm -f "$dir/subset.png"
glyphs=$glyphs_subset
fi
sha1sum=`sha1sum "$dir/font.ttf.subset" | cut -d' ' -f1`
subset="fonts/sha1sum/$sha1sum.ttf"
mv "$dir/font.ttf.subset" "$subset"
# There ought to be an easier way to do this, but it escapes me...
unicodes_file=`mktemp`
glyphs_file=`mktemp`
echo "$unicodes" > "$unicodes_file"
echo "$glyphs" > "$glyphs_file"
# Open the "file"s
exec 3<"$unicodes_file"
exec 4<"$glyphs_file"
while read uline <&3 && read gline <&4; do
echo "$subset:$options:$uline:$gline"
done
rm -f "$dir/font.ttf"
rmdir "$dir"
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