From 46593e7aa26b83f0ba1b0d36a700d7158ac2b178 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 31 Mar 2014 21:40:21 +0000
Subject: [PATCH] Add names for mouse button bits rather than using magic
 numbers, from Marcel Partap.

---
 tmux.h     | 12 ++++++++++--
 tty-keys.c | 10 +++++-----
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/tmux.h b/tmux.h
index b7d53727..94eb5b8f 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1128,18 +1128,26 @@ struct tty_term {
 };
 LIST_HEAD(tty_terms, tty_term);
 
+/* Mouse button masks. */
+#define MOUSE_MASK_BUTTONS 3
+#define MOUSE_MASK_SHIFT 4
+#define MOUSE_MASK_META 8
+#define MOUSE_MASK_CTRL 16
+#define MOUSE_MASK_DRAG 32
+#define MOUSE_MASK_WHEEL 64
+
 /* Mouse wheel states. */
 #define MOUSE_WHEEL_UP 0
 #define MOUSE_WHEEL_DOWN 1
 
-/* Mouse events. */
+/* Mouse event bits. */
 #define MOUSE_EVENT_DOWN 0x1
 #define MOUSE_EVENT_DRAG 0x2
 #define MOUSE_EVENT_UP 0x4
 #define MOUSE_EVENT_CLICK 0x8
 #define MOUSE_EVENT_WHEEL 0x10
 
-/* Mouse flags. */
+/* Mouse flag bits. */
 #define MOUSE_RESIZE_PANE 0x1
 
 /*
diff --git a/tty-keys.c b/tty-keys.c
index 4492df1e..e0e794cc 100644
--- a/tty-keys.c
+++ b/tty-keys.c
@@ -748,21 +748,21 @@ tty_keys_mouse(struct tty *tty, const char *buf, size_t len, size_t *size)
 	m->sgr_rel = sgr_rel;
 	m->x = x;
 	m->y = y;
-	if (b & 64) { /* wheel button */
-		b &= 3;
+	if (b & MOUSE_MASK_WHEEL) {
+		b &= MOUSE_MASK_BUTTONS;
 		if (b == 0)
 			m->wheel = MOUSE_WHEEL_UP;
 		else if (b == 1)
 			m->wheel = MOUSE_WHEEL_DOWN;
 		m->event = MOUSE_EVENT_WHEEL;
-	} else if ((b & 3) == 3) {
+	} else if ((b & MOUSE_MASK_BUTTONS) == 3) {
 		if (~m->event & MOUSE_EVENT_DRAG && x == m->x && y == m->y) {
 			m->event = MOUSE_EVENT_CLICK;
 		} else
 			m->event = MOUSE_EVENT_DRAG;
 		m->event |= MOUSE_EVENT_UP;
 	} else {
-		if (b & 32) /* drag motion */
+		if (b & MOUSE_MASK_DRAG)
 			m->event = MOUSE_EVENT_DRAG;
 		else {
 			if (m->event & MOUSE_EVENT_UP && x == m->x && y == m->y)
@@ -773,7 +773,7 @@ tty_keys_mouse(struct tty *tty, const char *buf, size_t len, size_t *size)
 			m->sy = y;
 			m->event = MOUSE_EVENT_DOWN;
 		}
-		m->button = (b & 3);
+		m->button = (b & MOUSE_MASK_BUTTONS);
 	}
 
 	return (0);