[PR PATCH] mcolor: Add coloring support for diffs

[thyssentishman <thyssentishman@users.noreply.github.com>]

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There is a new pull request by thyssentishman against master on the mblaze repository

https://github.com/thyssentishman/mblaze master
https://github.com/leahneukirchen/mblaze/pull/249

mcolor: Add coloring support for diffs
Add coloring for diffs sent as part of the email body. This adds support for the following three ENV variables:

- **MCOLOR_DIFF_I**: For (I)nserted lines.
- **MCOLOR_DIFF_D**: For (D)eleted lines
- **MCOLOR_DIFF_R**: For file (R)anges

Since the default theme is quite bright, these default to bright colors as well (Green1, Red1 and Yellow1 from the 256 XTerm colors respectively).

A patch file from https://github.com/leahneukirchen/mblaze/pull/249.patch is attached

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From 8dca80032e6fab9d2e656d8980a805c9e44abbeb Mon Sep 17 00:00:00 2001
From: Johannes Thyssen Tishman <johannes@thyssentishman.com>
Date: Thu, 5 Oct 2023 15:39:46 +0200
Subject: [PATCH] mcolor: Add coloring support for diffs

---
 mcolor | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mcolor b/mcolor
index ba2c42c..9fff0c0 100755
--- a/mcolor
+++ b/mcolor
@@ -10,12 +10,16 @@ no_color { print; next }
 /^\014$/ { nextmail = 1; print(fg(co("FF",232), $0)); next }
 /^$/ { hdr = 0 }
 /^-- $/ { ftr = 1 }
-/^--- .* ---/ { print fg(co("SEP",242), $0); ftr = 0; sig = 0; next }
+/^diff -/ { diff = 1 }
+/^--- .* ---/ { print fg(co("SEP",242), $0); ftr = 0; diff = 0; sig = 0; next }
 /^-----BEGIN .* SIGNATURE-----/ { sig = 1 }
 nextmail && /^From:/ { hdr = 1 }
 hdr && /^From:/ { print so(fg(co("FROM",119), $0)); next }
 hdr { print fg(co("HEADER",120), $0); next }
 ftr { print fg(co("FOOTER",244), $0); next }
+diff && /^-/ { print fg(co("DIFF_D",196), $0); next }
+diff && /^\+/ { print fg(co("DIFF_I",46), $0); next }
+diff && /^@/ { print fg(co("DIFF_R",226), $0); next }
 /^-----BEGIN .* MESSAGE-----/ ||
 /^-----END .* SIGNATURE-----/ { print fg(co("SIG",244), $0); sig = 0; next }
 sig { print fg(co("SIG",244), $0); next }