From 28f3e760befb4f98df65245d985c383f3b3b34ae Mon Sep 17 00:00:00 2001
From: Jan Beich <jbeich@FreeBSD.org>
Date: Sun, 14 Jun 2020 07:22:08 +0000
Subject: [PATCH] editors/emacs: backport 24-bit color fix for tty mode

FreeBSD base libncurses is stuck with termcap(5) but setb24/setf24
capabilities can only be expressed via terminfo(5). Work around via
environ(7) variable that some terminal emulators define by default.

PR:		247248
Approved by:	?
---
 editors/emacs/Makefile            |  2 +-
 editors/emacs/files/patch-tty-rgb | 31 +++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 1 deletion(-)
 create mode 100644 editors/emacs/files/patch-tty-rgb

diff --git a/editors/emacs/Makefile b/editors/emacs/Makefile
index 37df41b48c7f..57ea6cda40eb 100644
--- a/editors/emacs/Makefile
+++ b/editors/emacs/Makefile
@@ -3,7 +3,7 @@
 
 PORTNAME=	emacs
 DISTVERSION=	26.3
-PORTREVISION=	4
+PORTREVISION=	5
 PORTEPOCH=	3
 CATEGORIES=	editors
 MASTER_SITES=	GNU
diff --git a/editors/emacs/files/patch-tty-rgb b/editors/emacs/files/patch-tty-rgb
new file mode 100644
index 000000000000..66c535ac4301
--- /dev/null
+++ b/editors/emacs/files/patch-tty-rgb
@@ -0,0 +1,31 @@
+Add RGB fallback if environment has COLORTERM=truecolor
+http://debbugs.gnu.org/cgi/bugreport.cgi?bug=41846
+
+--- doc/misc/efaq.texi.orig	2019-01-07 14:26:06 UTC
++++ doc/misc/efaq.texi
+@@ -1603,6 +1603,9 @@ Currently there's no standard way to determine whether
+ supports direct color mode.  If such standard arises later on, support
+ for @samp{setb24} and @samp{setf24} may be removed.
+ 
++If Terminfo database is not available 24-bit direct color mode can
++still be enabled by defining @env{COLORTERM} to @samp{truecolor}.
++
+ @node Debugging a customization file
+ @section How do I debug a @file{.emacs} file?
+ @cindex Debugging @file{.emacs} file
+--- src/term.c.orig	2019-01-07 14:26:07 UTC
++++ src/term.c
+@@ -4157,6 +4157,13 @@ use the Bourne shell command 'TERM=...; export TERM' (
+ 	    tty->TS_set_background = bg;
+ 	    tty->TN_max_colors = 16777216;
+ 	  }
++	/* Fall back to xterm+direct (semicolon version) if requested by COLORTERM */
++	else if ((bg = getenv("COLORTERM")) != NULL && !strcasecmp(bg, "truecolor"))
++	  {
++	    tty->TS_set_foreground = "\033[%?%p1%{8}%<%t3%p1%d%e38;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%d%;m";
++	    tty->TS_set_background = "\033[%?%p1%{8}%<%t4%p1%d%e48;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%d%;m";
++	    tty->TN_max_colors = 16777216;
++	  }
+       }
+ #endif
+