ht: add generated X11 keysym maps

Now we can make sense of keysyms and translate them to text.

ht/gen-keysyms.sh

@@ -0,0 +1,49 @@
+#!/bin/sh
+gofmt <<EOF | sed 's, *//$,,'
+// Code generated by running "go generate" in janouch.name/haven. DO NOT EDIT.
+
+package $GOPACKAGE
+
+import "janouch.name/haven/nexgb/xproto"
+
+$(curl --silent --show-error \
+	https://cgit.freedesktop.org/xorg/proto/x11proto/plain/keysymdef.h \
+	https://cgit.freedesktop.org/xorg/proto/x11proto/plain/XF86keysym.h \
+| perl -lne '
+	next unless /^\#define\s+
+		(XF86)?(XK_)([a-zA-Z_0-9]+)\s+
+		0x([0-9a-fA-F]+)\s*
+		(?:\/\*\s*(.*?)\s*\*\/)?\s*
+	$/x;
+
+	my ($name, $ident, $hex, $comment) =
+		(($1 // "") . $3,  ($1 // "") . $2 . $3, lc $4, ($5 // ""));
+
+	# They are already somewhat sorted in the source file.
+	push @a, { hex => $hex, ident => $ident, comment => $comment };
+
+	$nametokeysym{$name} = $ident;
+
+	# All but the first name listed should be considered deprecated.
+	$keysymtoname{$ident} = $name unless exists $seen{$hex};
+	$seen{$hex}++;
+
+	END {
+		print "const (";
+		print "$_->{ident} = 0x$_->{hex} // $_->{comment}" for @a;
+		print ")";
+
+		# Very large tables, should be an on-demand package :(
+
+		print "// KeysymToName maps X11 keysym constants to their names";
+		print "var KeysymToName = map[xproto.Keysym]string{";
+		print "$_: \"$keysymtoname{$_}\"," for sort keys %keysymtoname;
+		print "}";
+
+		print "// NameToKeysym maps X11 keysym names to their constants";
+		print "var NameToKeysym = map[string]xproto.Keysym{";
+		print "\"$_\": $nametokeysym{$_}," for sort keys %nametokeysym;
+		print "}";
+	}
+')
+EOF