rainbow-dark: drop rainbow dashes, add rainbow-timestamp.pl

- rainbow-dark.theme: revert line_start back to the stock '-!-' pattern.
- .irssi/scripts/autorun/rainbow-timestamp.pl: new autorun script that
  hooks 'print text', matches a leading HH:MM[:SS], and reruns it
  through rainbow.pl's make_colors (same palette [4,8,9,11,12,13],
  same 2-char stride, same phase-advance on each line). The result
  is that every successive timestamp is a 5-character rainbow
  gradient that also shifts starting colour line-to-line.

.irssi/rainbow-dark.theme

@@ -62,11 +62,8 @@ abstracts = {
   ## generic
   ##
 
-  # text to insert at the beginning of each non-message line — ROYGBIV dashes
+  # text to insert at the beginning of each non-message line (default)
-  #   R = bright red, O = dark yellow/brown (closest ANSI orange),
+  line_start = "%B-%n!%B-%n ";
-  #   Y = bright yellow, G = bright green, B = bright blue,
-  #   I = dark blue (closest ANSI indigo), V = bright magenta (violet).
-  line_start = "%R-%y-%Y-%G-%B-%b-%M-%n ";
 
   # timestamp styling, nothing by default
   timestamp = "$*";

.irssi/scripts/autorun/rainbow-timestamp.pl

@@ -0,0 +1,67 @@
+#
+# rainbow-timestamp.pl — paint each printed line's leading timestamp with
+# the rotating rainbow palette from rainbow.pl, so every successive line
+# advances the colour phase. Each individual timestamp is itself a
+# gradient across its own characters (HH:MM -> five different colours).
+#
+# Drops into ~/.irssi/scripts/autorun/; loads automatically on irssi start.
+#
+
+use strict;
+use warnings;
+use vars qw($VERSION %IRSSI);
+use Irssi;
+
+$VERSION = '0.1';
+%IRSSI = (
+    authors     => 'dissimulo',
+    contact     => 'connect+gitea@dustin-williams.com',
+    name        => 'rainbow-timestamp',
+    description => 'Rotating-rainbow timestamps (same palette/logic as rainbow.pl).',
+    license     => 'GNU GPLv2 or later',
+);
+
+# mIRC colour palette — identical to rainbow.pl:
+#   4 = light red, 8 = yellow, 9 = light green,
+#   11 = light cyan, 12 = light blue, 13 = light magenta
+my @colors    = ('4', '8', '9', '11', '12', '13');
+my $last_color = 0;
+my $colorrep  = 2;   # how many chars share each colour before advancing
+
+sub make_colors {
+    my ($string) = @_;
+    my $out  = '';
+    my $last = $last_color;
+    for (my $c = 0; $c < length($string); $c++) {
+        my $char = substr($string, $c, 1);
+        $last++;
+        my $color = int($last / $colorrep) % scalar(@colors);
+        $out .= "\003" . sprintf('%02d', $colors[$color]);
+        $out .= ($char eq ',') ? "\," : $char;
+    }
+    $last_color += 2;   # advance phase so the next call starts shifted
+    return $out;
+}
+
+# Hook 'print text' — fires once per window line, with the fully-rendered
+# text (including the leading timestamp if info_eol is off, which is the
+# default). We match a leading HH:MM or HH:MM:SS, recolour it, and pass
+# the line back through signal_continue with the rest of the text intact.
+Irssi::signal_add('print text', sub {
+    my ($dest, $text, $stripped) = @_;
+    return unless defined $text;
+
+    # Strip any existing colour codes from just the prefix to find the
+    # raw timestamp (irssi's theme abstract may have wrapped it).
+    # Match (optional colour prefix) + HH:MM[:SS] + (optional colour suffix) + space
+    if ($text =~ /^((?:\003\d{1,2}(?:,\d{1,2})?)*)(\d{2}:\d{2}(?::\d{2})?)((?:\017|\003)?)(\s)/) {
+        my $pre   = $1;       # existing colour codes before the timestamp
+        my $ts    = $2;       # the timestamp itself
+        my $post  = $3;       # colour reset (if any)
+        my $sep   = $4;       # whitespace between ts and rest
+        my $rest  = substr($text, length($pre) + length($ts) + length($post) + length($sep));
+
+        my $coloured = make_colors($ts) . "\017";   # \017 = reset colour
+        Irssi::signal_continue($dest, $coloured . $sep . $rest, $stripped);
+    }
+});