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+# gen-ircfmt.awk: generate a supplementary font for IRC formatting characters
+#
+# Copyright (c) 2022, Přemysl Eric Janouch <p@janouch.name>
+# SPDX-License-Identifier: 0BSD
+#
+# Usage: awk -v Output=static/ircfmt.woff2 -f gen-ircfmt.awk
+# Clean up SVG byproducts yourself.
+
+BEGIN {
+ if (!Output) {
+ print "Error: you must specify the output filename"
+ exit 1
+ }
+}
+
+function glyph(name, code, path, filename, actions, cmd) {
+ filename = Output "." name ".svg"
+
+ # Inkscape still does a terrible job at the stroke-to-path conversion.
+ actions = \
+ "select-by-id:group;" \
+ "selection-ungroup;" \
+ "select-clear;" \
+ "select-by-id:path;" \
+ "object-stroke-to-path;" \
+ "select-by-id:clip;" \
+ "path-intersection;" \
+ "select-all;" \
+ "path-combine;" \
+ "export-overwrite;" \
+ "export-filename:" filename ";" \
+ "export-do"
+
+ # These dimensions fit FontForge defaults, and happen to work well.
+ cmd = "inkscape --pipe --actions='" actions "'"
+ print "<?xml version='1.0' encoding='UTF-8' standalone='no'?>\n" \
+ "<svg version='1.1' xmlns='http://www.w3.org/2000/svg'\n" \
+ " width='1000' height='1000' viewBox='0 0 1000 1000'>\n" \
+ " <rect x='0' y='0' width='1000' height='1000' />\n" \
+ " <g id='group' transform='translate(200 200) scale(60, 60)'>\n" \
+ " <rect id='clip' x='0' y='0' width='10' height='10' />\n" \
+ " <path id='path' stroke-width='2' fill='none' stroke='#fff'\n" \
+ " d='" path "' />\n" \
+ " </g>\n" \
+ "</svg>\n" | cmd
+ close(cmd)
+
+ print "Select(0u" code ")\n" \
+ "Import('" filename "')" | FontForge
+}
+
+BEGIN {
+ FontForge = "fontforge -lang=ff -"
+ print "New()" | FontForge
+
+ # Designed a 10x10 raster, going for maximum simplicity.
+ glyph("B", "02", "m 6,5 c 0,0 2,0 2,2 0,2 -2,2 -2,2 h -3 v -8 h 2.5 c 0,0 2,0 2,2 0,2 -2,2 -2,2 h -2 Z")
+ glyph("C", "03", "m 7.6,7 A 3,4 0 0 1 4.25,8.875 3,4 0 0 1 2,5 3,4 0 0 1 4.25,1.125 3,4 0 0 1 7.6,3")
+ glyph("I", "1D", "m 3,9 h 4 m 0,-8 h -4 m 2,-1 v 10")
+ glyph("M", "11", "m 2,10 v -10 l 3,6 3,-6 v 10")
+ glyph("O", "0F", "m 1,9 l 8,-8 M 2,5 a 3,3 0 1 0 6,0 3,3 0 1 0 -6,0 z")
+ #glyph("R", "0F", "m 3,10 v -9 h 2 c 0,0 2.5,0 2.5,2.5 0,2.5 -2.5,2.5 -2.5,2.5 h -2 2.5 l 2.5,4.5")
+ glyph("S", "1E", "m 7.5,3 c 0,-1 -1,-2 -2.5,-2 -1.5,0 -2.5,1 -2.5,2 0,3 5,1 5,4 0,1 -1,2 -2.5,2 -1.5,0 -2.5,-1 -2.5,-2")
+ glyph("U", "1F", "m 2.5,0 v 6.5 c 0,1.5 1,2.5 2.5,2.5 1.5,0 2.5,-1 2.5,-2.5 v -6.5")
+ glyph("V", "16", "m 2,-1 3,11 3,-11")
+
+ # In practice, your typical browser font will overshoot its em box,
+ # so to make the display more cohesive, we need to do the same.
+ # Sadly, sf->use_typo_metrics can't be unset from FontForge script--
+ # this is necessary to prevent the caret from jumping upon the first
+ # inserted non-formatting character in xP's textarea.
+ # https://iamvdo.me/en/blog/css-font-metrics-line-height-and-vertical-align
+ print "SelectAll()\n" \
+ "Scale(115, 115, 0, 0)\n" \
+ "SetOS2Value('WinAscentIsOffset', 1)\n" \
+ "SetOS2Value('WinDescentIsOffset', 1)\n" \
+ "SetOS2Value('HHeadAscentIsOffset', 1)\n" \
+ "SetOS2Value('HHeadDescentIsOffset', 1)\n" \
+ "CorrectDirection()\n" \
+ "AutoWidth(100)\n" \
+ "AutoHint()\n" \
+ "AddExtrema()\n" \
+ "RoundToInt()\n" \
+ "SetFontNames('IRCFormatting-Regular'," \
+ " 'IRC Formatting', 'IRC Formatting Regular', 'Regular'," \
+ " 'Copyright (c) 2022, Premysl Eric Janouch')\n" \
+ "Generate('" Output "')\n" | FontForge
+ close(FontForge)
+}