Add a terminal feature for enable/disable extended keys (supported by

xterm and mintty) and add an option to make tmux send it. Only forward
extended keys if the application has requested them, even though we use
the CSI u sequence and xterm uses CSI 27 ~ - this is what mintty does as
well.

1 files changed, 15 insertions, 2 deletions

diff --git a/tty-features.c b/tty-features.c
index 30d3d1a0..26344b90 100644
--- a/tty-features.c
+++ b/tty-features.c
@@ -190,6 +190,18 @@ static const struct tty_feature tty_feature_sync = {
 	0
 };
 
+/* Terminal supports extended keys. */
+static const char *tty_feature_extkeys_capabilities[] = {
+	"Eneks=\\E[>4;1m",
+	"Dseks=\\E[>4m",
+	NULL
+};
+static const struct tty_feature tty_feature_extkeys = {
+	"extkeys",
+	tty_feature_extkeys_capabilities,
+	0
+};
+
 /* Terminal supports DECSLRM margins. */
 static const char *tty_feature_margins_capabilities[] = {
 	"Enmg=\\E[?69h",
@@ -218,6 +230,7 @@ static const struct tty_feature *tty_features[] = {
 	&tty_feature_ccolour,
 	&tty_feature_clipboard,
 	&tty_feature_cstyle,
+	&tty_feature_extkeys,
 	&tty_feature_focus,
 	&tty_feature_margins,
 	&tty_feature_overline,
@@ -321,7 +334,7 @@ tty_default_features(int *feat, const char *name, u_int version)
 	} table[] = {
 #define TTY_FEATURES_BASE_MODERN_XTERM "256,RGB,bpaste,clipboard,strikethrough,title"
 		{ .name = "mintty",
-		  .features = TTY_FEATURES_BASE_MODERN_XTERM ",ccolour,cstyle,margins,overline"
+		  .features = TTY_FEATURES_BASE_MODERN_XTERM ",ccolour,cstyle,extkeys,margins,overline"
 		},
 		{ .name = "tmux",
 		  .features = TTY_FEATURES_BASE_MODERN_XTERM ",ccolour,cstyle,focus,overline,usstyle"
@@ -333,7 +346,7 @@ tty_default_features(int *feat, const char *name, u_int version)
 		  .features = TTY_FEATURES_BASE_MODERN_XTERM ",cstyle,margins,sync"
 		},
 		{ .name = "XTerm",
-		  .features = TTY_FEATURES_BASE_MODERN_XTERM ",ccolour,cstyle,focus,margins,rectfill"
+		  .features = TTY_FEATURES_BASE_MODERN_XTERM ",ccolour,cstyle,extkeys,focus,margins,rectfill"
 		}
 	};
 	u_int	i;