From 2d08235987efa1e2f9c932c4a5c8a0200b4804c1 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Tue, 1 Nov 2022 09:54:13 +0000
Subject: [PATCH] Add modified Tab key sequences, from Aaron Jensen, GitHub
 issue 3368.

---
 input-keys.c | 18 ++++++++++++++++++
 key-string.c |  2 ++
 tmux.h       |  1 +
 tty-keys.c   |  5 ++++-
 4 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/input-keys.c b/input-keys.c
index 038003df..5c4d3e1b 100644
--- a/input-keys.c
+++ b/input-keys.c
@@ -307,6 +307,20 @@ static struct input_key_entry input_key_defaults[] = {
 	},
 	{ .key = KEYC_DC|KEYC_BUILD_MODIFIERS,
 	  .data = "\033[3;_~"
+	},
+
+	/* Tab and modifiers. */
+	{ .key = '\011'|KEYC_CTRL,
+	  .data = "\011"
+	},
+	{ .key = '\011'|KEYC_CTRL|KEYC_EXTENDED,
+	  .data = "\033[9;5u"
+	},
+	{ .key = '\011'|KEYC_CTRL|KEYC_SHIFT,
+	  .data = "\011"
+	},
+	{ .key = '\011'|KEYC_CTRL|KEYC_SHIFT|KEYC_EXTENDED,
+	  .data = "\033[1;5Z"
 	}
 };
 static const key_code input_key_modifiers[] = {
@@ -469,6 +483,8 @@ input_key(struct screen *s, struct bufferevent *bev, key_code key)
 		key &= ~KEYC_KEYPAD;
 	if (~s->mode & MODE_KCURSOR)
 		key &= ~KEYC_CURSOR;
+	if (~s->mode & MODE_KEXTENDED)
+		key &= ~KEYC_EXTENDED;
 	ike = input_key_get(key);
 	if (ike == NULL && (key & KEYC_META) && (~key & KEYC_IMPLIED_META))
 		ike = input_key_get(key & ~KEYC_META);
@@ -476,6 +492,8 @@ input_key(struct screen *s, struct bufferevent *bev, key_code key)
 		ike = input_key_get(key & ~KEYC_CURSOR);
 	if (ike == NULL && (key & KEYC_KEYPAD))
 		ike = input_key_get(key & ~KEYC_KEYPAD);
+	if (ike == NULL && (key & KEYC_EXTENDED))
+		ike = input_key_get(key & ~KEYC_EXTENDED);
 	if (ike != NULL) {
 		log_debug("found key 0x%llx: \"%s\"", key, ike->data);
 		if ((key & KEYC_META) && (~key & KEYC_IMPLIED_META))
diff --git a/key-string.c b/key-string.c
index 0ca91306..086c3ac4 100644
--- a/key-string.c
+++ b/key-string.c
@@ -460,6 +460,8 @@ out:
 			strlcat(out, "I", sizeof out);
 		if (saved & KEYC_BUILD_MODIFIERS)
 			strlcat(out, "B", sizeof out);
+		if (saved & KEYC_EXTENDED)
+			strlcat(out, "E", sizeof out);
 		strlcat(out, "]", sizeof out);
 	}
 	return (out);
diff --git a/tmux.h b/tmux.h
index a0f9f461..6cb6cc96 100644
--- a/tmux.h
+++ b/tmux.h
@@ -137,6 +137,7 @@ struct winlink;
 #define KEYC_IMPLIED_META    0x08000000000000ULL
 #define KEYC_BUILD_MODIFIERS 0x10000000000000ULL
 #define KEYC_VI              0x20000000000000ULL
+#define KEYC_EXTENDED        0x40000000000000ULL
 
 /* Masks for key bits. */
 #define KEYC_MASK_MODIFIERS  0x00f00000000000ULL
diff --git a/tty-keys.c b/tty-keys.c
index bb9ec231..db82754f 100644
--- a/tty-keys.c
+++ b/tty-keys.c
@@ -208,6 +208,9 @@ static const struct tty_default_key_raw tty_default_raw_keys[] = {
 	/* Paste keys. */
 	{ "\033[200~", KEYC_PASTE_START },
 	{ "\033[201~", KEYC_PASTE_END },
+
+	/* Extended keys. */
+	{ "\033[1;5Z", '\011'|KEYC_CTRL|KEYC_SHIFT|KEYC_EXTENDED },
 };
 
 /* Default xterm keys. */
@@ -974,7 +977,7 @@ tty_keys_extended_key(struct tty *tty, const char *buf, size_t len,
 		log_debug("%s: extended key %.*s is %llx (%s)", c->name,
 		    (int)*size, buf, nkey, key_string_lookup_key(nkey, 1));
 	}
-	*key = nkey;
+	*key = nkey|KEYC_EXTENDED;
 	return (0);
 }