bind{code,sym}: utilize mouse button helpers

This modifies `bindcode` and `bindsym` to use `get_mouse_bindcode` and
`get_mouse_bindsym`, respectively, to parse mouse buttons. Additionally,
the `BINDING_MOUSE` type has been split into `BINDING_MOUSECODE` and
`BINDING_MOUSESYM` to match keys and allow for mouse bindcodes to be
used. Between the two commands, all button syms and codes should be
supported, including x11 axis buttons.

3 files changed, 82 insertions, 54 deletions

diff --git a/sway/commands/bind.c b/sway/commands/bind.c
index 4fceaf8c..be47d412 100644
--- a/sway/commands/bind.c
+++ b/sway/commands/bind.c
@@ -85,69 +85,91 @@ static int key_qsort_cmp(const void *keyp_a, const void *keyp_b) {
  */
 static struct cmd_results *identify_key(const char* name, bool first_key,
 		uint32_t* key_val, enum binding_input_type* type) {
-	if (*type == BINDING_KEYCODE) {
-		// check for keycode
-		xkb_keycode_t keycode = strtol(name, NULL, 10);
-		if (!xkb_keycode_is_legal_ext(keycode)) {
-			return cmd_results_new(CMD_INVALID, "bindcode",
-					"Invalid keycode '%s'", name);
+	if (*type == BINDING_MOUSECODE) {
+		// check for mouse bindcodes
+		char *message = NULL;
+		uint32_t button = get_mouse_bindcode(name, &message);
+		if (!button) {
+			if (message) {
+				struct cmd_results *error =
+					cmd_results_new(CMD_INVALID, "bindcode", message);
+				free(message);
+				return error;
+			} else {
+				return cmd_results_new(CMD_INVALID, "bindcode",
+						"Unknown button code %s", name);
+			}
 		}
-		*key_val = keycode;
-	} else {
-		// check for keysym
-		xkb_keysym_t keysym = xkb_keysym_from_name(name,
-				XKB_KEYSYM_CASE_INSENSITIVE);
-
-		// Check for mouse binding
-		uint32_t button = 0;
-		if (strncasecmp(name, "button", strlen("button")) == 0) {
-			// Map to x11 mouse buttons
-			button = name[strlen("button")] - '0';
-			if (button < 1 || button > 9 || strlen(name) > strlen("button0")) {
+		*key_val = button;
+	} else if (*type == BINDING_MOUSESYM) {
+		// check for mouse bindsyms (x11 buttons or event names)
+		char *message = NULL;
+		uint32_t button = get_mouse_bindsym(name, &message);
+		if (!button) {
+			if (message) {
+				struct cmd_results *error =
+					cmd_results_new(CMD_INVALID, "bindsym", message);
+				free(message);
+				return error;
+			} else if (!button) {
 				return cmd_results_new(CMD_INVALID, "bindsym",
-						"Only buttons 1-9 are supported. For other mouse "
-						"buttons, use the name of the event code.");
+						"Unknown button %s", name);
 			}
-			uint32_t buttons[] = {BTN_LEFT, BTN_MIDDLE, BTN_RIGHT,
-				SWAY_SCROLL_UP, SWAY_SCROLL_DOWN, SWAY_SCROLL_LEFT,
-				SWAY_SCROLL_RIGHT, BTN_SIDE, BTN_EXTRA};
-			button = buttons[button - 1];
-		} else if (strncmp(name, "BTN_", strlen("BTN_")) == 0) {
-			// Get event code
-			int code = libevdev_event_code_from_name(EV_KEY, name);
-			if (code == -1) {
-				return cmd_results_new(CMD_INVALID, "bindsym",
-						"Invalid event code name %s", name);
+		}
+		*key_val = button;
+	} else if (*type == BINDING_KEYCODE) {
+		// check for keycode. If it is the first key, allow mouse bindcodes
+		if (first_key) {
+			char *message = NULL;
+			uint32_t button = get_mouse_bindcode(name, &message);
+			free(message);
+			if (button) {
+				*type = BINDING_MOUSECODE;
+				*key_val = button;
+				return NULL;
 			}
-			button = code;
 		}
 
-		if (*type == BINDING_KEYSYM) {
-			if (button) {
-				if (first_key) {
-					*type = BINDING_MOUSE;
-					*key_val = button;
-				} else {
-					return cmd_results_new(CMD_INVALID, "bindsym",
-							"Mixed button '%s' into key sequence", name);
-				}
-			} else if (keysym) {
-				*key_val = keysym;
+		xkb_keycode_t keycode = strtol(name, NULL, 10);
+		if (!xkb_keycode_is_legal_ext(keycode)) {
+			if (first_key) {
+				return cmd_results_new(CMD_INVALID, "bindcode",
+						"Invalid keycode or button code '%s'", name);
 			} else {
-				return cmd_results_new(CMD_INVALID, "bindsym",
-						"Unknown key '%s'", name);
+				return cmd_results_new(CMD_INVALID, "bindcode",
+						"Invalid keycode '%s'", name);
 			}
-		} else {
-			if (button) {
+		}
+		*key_val = keycode;
+	} else {
+		// check for keysym. If it is the first key, allow mouse bindsyms
+		if (first_key) {
+			char *message = NULL;
+			uint32_t button = get_mouse_bindsym(name, &message);
+			if (message) {
+				struct cmd_results *error =
+					cmd_results_new(CMD_INVALID, "bindsym", message);
+				free(message);
+				return error;
+			} else if (button) {
+				*type = BINDING_MOUSESYM;
 				*key_val = button;
-			} else if (keysym) {
+				return NULL;
+			}
+		}
+
+		xkb_keysym_t keysym = xkb_keysym_from_name(name,
+				XKB_KEYSYM_CASE_INSENSITIVE);
+		if (!keysym) {
+			if (first_key) {
 				return cmd_results_new(CMD_INVALID, "bindsym",
-						"Mixed keysym '%s' into button sequence", name);
+						"Unknown key or button '%s'", name);
 			} else {
 				return cmd_results_new(CMD_INVALID, "bindsym",
-						"Unknown button '%s'", name);
+					"Unknown key '%s'", name);
 			}
 		}
+		*key_val = keysym;
 	}
 	return NULL;
 }
@@ -201,7 +223,8 @@ static struct cmd_results *cmd_bindsym_or_bindcode(int argc, char **argv,
 	}
 	if (binding->flags & (BINDING_BORDER | BINDING_CONTENTS | BINDING_TITLEBAR)
 			|| exclude_titlebar) {
-		binding->type = BINDING_MOUSE;
+		binding->type = binding->type == BINDING_KEYCODE ?
+			BINDING_MOUSECODE : BINDING_MOUSESYM;
 	}
 
 	if (argc < 2) {
@@ -249,7 +272,8 @@ static struct cmd_results *cmd_bindsym_or_bindcode(int argc, char **argv,
 	// that this is one
 	if (exclude_titlebar) {
 		binding->flags &= ~BINDING_TITLEBAR;
-	} else if (binding->type == BINDING_MOUSE) {
+	} else if (binding->type == BINDING_MOUSECODE
+			|| binding->type == BINDING_MOUSESYM) {
 		binding->flags |= BINDING_TITLEBAR;
 	}
 
diff --git a/sway/ipc-server.c b/sway/ipc-server.c
index 456db866..ff1bc89f 100644
--- a/sway/ipc-server.c
+++ b/sway/ipc-server.c
@@ -445,8 +445,12 @@ void ipc_event_binding(struct sway_binding *binding) {
 	json_object_object_add(json_binding, "input_code", json_object_new_int(input_code));
 	json_object_object_add(json_binding, "symbols", symbols);
 	json_object_object_add(json_binding, "symbol", symbol);
-	json_object_object_add(json_binding, "input_type", binding->type == BINDING_MOUSE ?
-			json_object_new_string("mouse") : json_object_new_string("keyboard"));
+
+	bool mouse = binding->type == BINDING_MOUSECODE ||
+		binding->type == BINDING_MOUSESYM;
+	json_object_object_add(json_binding, "input_type", mouse
+			? json_object_new_string("mouse")
+			: json_object_new_string("keyboard"));
 
 	json_object *json = json_object_new_object();
 	json_object_object_add(json, "change", json_object_new_string("run"));
diff --git a/sway/sway.5.scd b/sway/sway.5.scd
index 3757a097..3398ad58 100644
--- a/sway/sway.5.scd
+++ b/sway/sway.5.scd
@@ -302,7 +302,7 @@ runtime.
 ```
 
 	*bindcode* [--release|--locked] [--input-device=<device>] [--no-warn] <code> <command>
-	is also available for binding with key codes instead of key names.
+	is also available for binding with key/button codes instead of key/button names.
 
 *client.<class>* <border> <background> <text> <indicator> <child\_border>
 	Configures the color of window borders and title bars. All 5 colors are