From bda5b50b99fa06739fb2d370ff033bff54703108 Mon Sep 17 00:00:00 2001
From: bakkeby <bakkeby@gmail.com>
Date: Mon, 20 Apr 2020 12:35:11 +0200
Subject: [PATCH] [st][PATCH] OSC 10/11/12 fg, bg and cursor colors

Support for OSC escape sequences 10, 11 and 12 to modify the bg, fg and
cursor colors. I selected entries in the colorname table after the 255
position for defaultfg, defaultbg and defaultcs
---
 config.def.h |  4 ++--
 st.c         | 17 ++++++++++++++---
 st.h         |  1 +
 3 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/config.def.h b/config.def.h
index da02472..940321b 100644
--- a/config.def.h
+++ b/config.def.h
@@ -187,8 +187,8 @@ unsigned int defaultbg = 258;
 #else
 unsigned int defaultbg = 0;
 #endif // ALPHA_PATCH
-static unsigned int defaultcs = 256;
-static unsigned int defaultrcs = 257;
+unsigned int defaultcs = 256;
+unsigned int defaultrcs = 257;
 
 /*
  * Default shape of cursor
diff --git a/st.c b/st.c
index 7e493bd..1a1aea1 100644
--- a/st.c
+++ b/st.c
@@ -2009,12 +2009,23 @@ strhandle(void)
 			}
 			return;
 		case 4: /* color set */
-			if (narg < 3)
+		case 10: /* foreground set */
+		case 11: /* background set */
+		case 12: /* cursor color */
+			if ((par == 4 && narg < 3) || narg < 2)
 				break;
-			p = strescseq.args[2];
+			p = strescseq.args[((par == 4) ? 2 : 1)];
 			/* FALLTHROUGH */
 		case 104: /* color reset, here p = NULL */
-			j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
+			if (par == 10)
+				j = defaultfg;
+			else if (par == 11)
+				j = defaultbg;
+			else if (par == 12)
+				j = defaultcs;
+			else
+				j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
+
 			if (xsetcolorname(j, p)) {
 				if (par == 104 && narg <= 1)
 					return; /* color reset without parameter */
diff --git a/st.h b/st.h
index 030de38..525812d 100644
--- a/st.h
+++ b/st.h
@@ -141,6 +141,7 @@ extern char *termname;
 extern unsigned int tabspaces;
 extern unsigned int defaultfg;
 extern unsigned int defaultbg;
+extern unsigned int defaultcs;
 #if BOXDRAW_PATCH
 extern const int boxdraw, boxdraw_bold, boxdraw_braille;
 #endif // BOXDRAW_PATCH