use strict;
use warnings;
use open IO => ':utf8';
+use List::Util 'min';
our $VERSION = 'v1.0';
<h1>Terminal colours</h1>
<table>
-<tr><th>#<td>xterm</tr>
<:
+sub luminance {
+ # perceived brightness (using ITU-R recommendation 601 luma co-efficients)
+ my ($r, $g, $b) = @_;
+ return $r*.299 + $g*.587 + $b*.114;
+}
+
+sub colcell {
+ my $id = shift;
+ my @rgb = @_ >= 3 ? @_ : (map {hex} $_[0] =~ /(..)/g);
+ my $rgb24 = '';
+ $rgb24 .= sprintf '%X', min($_ / 17 + .5, 15) for @rgb[0..2];
+ my $rgb48 = '';
+ $rgb48 .= sprintf '%02X', $_ for @rgb[0..2];
+ my $inverse = sprintf('%X', luminance(@rgb)/255 < .3 ? 12 : 0) x 3;
+ return sprintf '<td style="%s; padding:0 1ex">%s<td style="%s">%s<td style="%s">%s',
+ "background:#$rgb48; color:#$inverse",
+ $id,
+ "background:#000; color:#$rgb48",
+ $rgb24,
+ "background:#FFF; color:#$rgb48",
+ $rgb24,
+}
+
my %col = (
-name => [
- qw/black red green orange blue magenta cyan gray
- gray red green yellow blue magenta cyan white/,
+ qw/black maroon green olive navy purple cyan silver
+ gray red lime yellow blue fuchsia aqua white/,
qw/reset bold dim italic underline blink fastblink
reverse hidden/,
],
- linux => [
- qw/000 CCC/,
- qw/000 A00 0A0 A50 00A A0A 0AA AAA
- 555 F55 5F5 FF5 55F F5F 5FF FFF/,
+ html => [
+ qw/000000 CCCCCC/,
+ qw/000000 800000 008000 808000 000080 800080 008080 C0C0C0
+ 808080 FF0000 00FF00 FFFF00 0000FF FF00FF 00FFFF FFFFFF/,
+ ],
+ cga => [
+ qw/000000 CCCCCC/,
+ qw/000000 AA0000 00AA00 AA5500 0000AA AA00AA 00AAAA AAAAAA
+ 555555 FF5555 55FF55 FFFF55 5555FF FF55FF 55FFFF FFFFFF/,
],
xterm => [
- qw/000 CCC/,
- qw/000 C00 0C0 CC0 4682B4 C0C 0CC E5E5E5
- 4C4C4C F00 0F0 FF0 1E90FF F0F 0FF FFF/,
+ qw/000000 CCCCCC/,
+ qw/000000 CC0000 00CC00 CCCC00 4682B4 CC00CC 00CCCC E5E5E5
+ 4C4C4C FF0000 00FF00 FFFF00 1E90FF FF00FF 00FFFF FFFFFF/,
],
tango => [
- qw/000 CCC/,
+ qw/000000 CCCCCC/,
qw/2E3436 CC0000 4E9A06 C4A000 3465A4 75507B 06989A D3D7CF
555753 EF2929 8AE234 FCE94F 729FCF AD7FA8 34E2E2 EEEEEC/,
],
);
+my @termlist = qw(html cga xterm tango);
+print '<tr>', (map {'<th colspan="3">'.$_} @termlist), "</tr>\n";
for my $num (0 .. 15) {
- printf('<tr><th>%d<td>%s%s</tr>'."\n",
- $num,
- $col{-name}[$num],
- join('', map {sprintf '<td style="%s"> ▪ ',
- 'background:#'.$col{$_}[0].'; color:#'.$col{$_}[$num + 2],
- } qw/linux xterm tango/ ),
+ printf('<tr>%s</tr>'."\n",
+ join('', map {
+ my $rgb = $col{$_}[$num + 2];
+ colcell($_ eq 'html' ? $col{-name}[$num] : $num, $rgb, $col{$_}[0])
+ } @termlist ),
);
}
:></table>