From 36266207701530f9b615f5b06b86f29b1178fa34 Mon Sep 17 00:00:00 2001
From: Mischa POSLAWSKY <perl@shiar.org>
Date: Wed, 29 Mar 2017 18:16:23 +0200
Subject: [PATCH] font: map option to list characters from unicode table

---
 font.plp | 62 ++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 54 insertions(+), 8 deletions(-)

diff --git a/font.plp b/font.plp
index 0b58eed..d4d7deb 100644
--- a/font.plp
+++ b/font.plp
@@ -17,6 +17,30 @@ if ($font) {
 	my ($fontmeta, @cover) = do "ttfsupport/$font.inc.pl";
 	$fontmeta or die "Unknown font $font\n";
 
+	my $map = eval {
+		$get{map} or return;
+
+		my $groupinfo = do 'unicode-cover.inc.pl' or die $@ || $!;
+
+		my ($cat, $name) = split m{/}, $get{map}, 2 or die "invalid map\n";
+		if (!$name) {
+			($cat, $name) = ('table', $cat);
+		}
+
+		my $row = $groupinfo->{$cat}->{$name}
+			or die "unknown character group $cat/$name\n";
+		my $query = $row->{query};
+
+		my @map;
+		for (map { split /[^\d-]/ } $query) {
+			my @range = split /-/, $_, 2;
+			m/^[0-9]+$/ or die "Invalid code point $_ in query $query\n" for @range;
+			push @map, $_ for $range[0] .. ($range[1] // $range[0]);
+		}
+		return \@map;
+	};
+	die $@ if $@;
+
 	require Unicode::UCD;
 
 	my $pagerows = 0x200;
@@ -78,21 +102,27 @@ if ($font) {
 EOT
 	say '<table class="glyphs big">';
 
+	my $offsetlink = '?' . join('&amp;',
+		(map { $_ . '=' . EncodeURI($get{$_}) } grep { defined $get{$_} } qw{ map }),
+		'q',
+	);
 	say "<caption>$_</caption>" for join(' ', grep {$_}
-		$offset > $pagerows && sprintf('<a rel="start" href="?q=%d">◄</a>', 0),
+		$offset > $pagerows && sprintf('<a rel="start" href="%s=%d">◄</a>', $offsetlink, 0),
 		$offset > 0 && sprintf(
-			'<a rel="prev" href="?q=%d" title="U+%1$04X">◅</a>',
-			$offset - $pagerows,
+			'<a rel="prev" href="%s=%d" title="U+%2$04X">◅</a>',
+			$offsetlink, $offset - $pagerows,
 		),
-		sprintf('U+%04X', $offset),
-		Unicode::UCD::charblock($offset),
-		$offset + $pagerows < 0x11_0000 && sprintf(
-			'<a rel="next" href="?q=%d" title="U+%1$04X">▻</a>',
-			$offset + $pagerows,
+		sprintf('U+%04X', $map ? $map->[$offset] : $offset),
+		Unicode::UCD::charblock($map ? $map->[$offset] : $offset),
+		$offset + $pagerows < ($map ? @{$map} : 0x11_0000) && sprintf(
+			'<a rel="next" href="%s=%d" title="U+%2$04X">▻</a>',
+			$offsetlink, $offset + $pagerows,
 		),
 	);
 
 	for my $cp ($offset .. $offset+$pagerows-1) {
+		$cp = $map->[$cp] or next if $map;
+
 		state $colpos;
 		my $block = Unicode::UCD::charblock($cp);
 		if ($block ne (state $sameblock = $block) and $block ne 'No_Block') {
@@ -104,6 +134,22 @@ EOT
 			$colpos = 0;
 		}
 
+		if ($map) {
+			# compare previous code point and indicate gaps
+			state $lastcp = 0;
+			if ($cp != ++$lastcp) {
+				if (!$colpos or $colpos++ % $pagecols > $pagecols - 3) {
+					# nearly last column, start new row
+					$colpos = 0;
+				}
+				else {
+					# mark repositioning in existing row
+					printf '<th>%X', $cp;
+				}
+				$lastcp = $cp;
+			}
+		}
+
 		say sprintf '<tr><th>%X', $cp if $colpos++ % $pagecols == 0;
 
 		my $info = $glyphs->glyph_info($cp);
-- 
2.30.0