vim ttymouse auto detection for GNU Screen/tmux

screen-ttymouse.diff

diff -r e56bf2af53c0 src/os_unix.c
--- a/src/os_unix.c  Wed May 15 23:13:10 2013 +0200
+++ b/src/os_unix.c	Tue May 21 00:04:11 2013 +0900
@@ -2190,6 +2190,7 @@
 		|| STRNICMP(name, "kterm", 5) == 0
 		|| STRNICMP(name, "mlterm", 6) == 0
 		|| STRNICMP(name, "rxvt", 4) == 0
+		|| STRNICMP(name, "screen", 6) == 0
 		|| STRCMP(name, "builtin_xterm") == 0);
 }
 
diff -r e56bf2af53c0 src/term.c
--- a/src/term.c	Wed May 15 23:13:10 2013 +0200
+++ b/src/term.c	Tue May 21 00:04:11 2013 +0900
@@ -4179,13 +4179,27 @@
 		    if (tp[0] == CSI)
 			switch_to_8bit();
 
+		    if (extra > 0)
+			extra = atoi((char *)tp + extra);
 		    /* rxvt sends its version number: "20703" is 2.7.3.
 		     * Ignore it for when the user has set 'term' to xterm,
 		     * even though it's an rxvt. */
-		    if (extra > 0)
-			extra = atoi((char *)tp + extra);
 		    if (extra > 20000)
-			extra = 0;
+		    {
+			/* check terminal ID */
+			switch(atoi((char *)tp + 2 + (tp[0] != CSI)))
+			{
+			case 'R': /* rxvt, ck */
+			    extra = 0;
+			    break;
+			case 'S': /* GNU Screen */
+			    extra = 95;
+			    break;
+			default:
+			    extra = 95;
+			    break;
+			}
+		    }
 
 		    if (tp[1 + (tp[0] != CSI)] == '>' && j == 2)
 		    {