Implemented configurable floating scroll behavior

include/config.h

@@ -167,10 +167,9 @@ enum edge_border_types {
 };
 
 enum floating_scroll_behavior {
-    FSB_GAPS_OUTER,     /**< Adjust outer gaps */
-    FSB_GAPS_INNER      /**< Adjust inner gaps */
-    // Note: in the future I expect to see more things you can do with the scroll
-    // wheel than maniuplating gaps
+	FSB_GAPS_OUTER,     /**< Adjust outer gaps */
+	FSB_GAPS_INNER,     /**< Adjust inner gaps */
+	FSB_CUSTOM          /**< Perform a user-defined action */
 };
 
 /**
@@ -191,7 +190,9 @@ struct sway_config {
 	uint32_t floating_mod;
 	uint32_t dragging_key;
 	uint32_t resizing_key;
-    enum floating_scroll_behavior floating_scroll; // TODO: command to set this
+	enum floating_scroll_behavior floating_scroll;
+    	char *fsb_up;
+	char *fsb_down;
 	enum swayc_layouts default_orientation;
 	enum swayc_layouts default_layout;
 	char *font;

sway/commands.c

@@ -58,6 +58,7 @@ static sway_cmd cmd_exec_always;
 static sway_cmd cmd_exit;
 static sway_cmd cmd_floating;
 static sway_cmd cmd_floating_mod;
+static sway_cmd cmd_floating_scroll;
 static sway_cmd cmd_focus;
 static sway_cmd cmd_focus_follows_mouse;
 static sway_cmd cmd_font;
@@ -705,6 +706,47 @@ static struct cmd_results *cmd_floating_mod(int argc, char **argv) {
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }
 
+static struct cmd_results *cmd_floating_scroll(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "floating_scroll", EXPECTED_AT_LEAST, 1))) {
+		return error;
+	}
+	if (!strcasecmp("behavior", argv[0])) {
+		if (argc < 2) {
+			error = cmd_results_new(CMD_INVALID, "floating_scroll", "Insufficient parameters given");
+			return error;
+		}
+		if (!strcasecmp("gaps_inner", argv[1])) {
+			config->floating_scroll = FSB_GAPS_INNER;
+		} else if (!strcasecmp("gaps_outer", argv[1])) {
+			config->floating_scroll = FSB_GAPS_OUTER;
+		} else if (!strcasecmp("custom", argv[1])) {
+			config->floating_scroll = FSB_CUSTOM;
+		} else {
+			error = cmd_results_new(CMD_INVALID, "floating_scroll", "Unknown behavior: '%s'", argv[1]);
+			return error;
+		}
+	} else if (!strcasecmp("up", argv[0])) {
+		free(config->fsb_up);
+		if (argc < 2) {
+			config->fsb_up = strdup("");
+		} else {
+			config->fsb_up = join_args(argv + 1, argc - 1);
+		}
+	} else if (!strcasecmp("down", argv[0])) {
+		free(config->fsb_down);
+		if (argc < 2) {
+			config->fsb_down = strdup("");
+		} else {
+			config->fsb_down = join_args(argv + 1, argc - 1);
+		}
+	} else {
+		error = cmd_results_new(CMD_INVALID, "floating_scroll", "Unknown command: '%s'", argv[0]);
+		return error;
+	}
+	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}
+
 static struct cmd_results *cmd_focus(int argc, char **argv) {
 	if (config->reading) return cmd_results_new(CMD_FAILURE, "focus", "Can't be used in config file.");
 	struct cmd_results *error = NULL;
@@ -2377,6 +2419,7 @@ static struct cmd_handler handlers[] = {
 	{ "exit", cmd_exit },
 	{ "floating", cmd_floating },
 	{ "floating_modifier", cmd_floating_mod },
+	{ "floating_scroll", cmd_floating_scroll },
 	{ "focus", cmd_focus },
 	{ "focus_follows_mouse", cmd_focus_follows_mouse },
 	{ "font", cmd_font },

sway/config.c

@@ -131,6 +131,8 @@ void free_config(struct sway_config *config) {
 	list_free(config->active_bar_modifiers);
 	free_flat_list(config->config_chain);
 	free(config->font);
+	free(config->fsb_up);
+	free(config->fsb_down);
 	free(config);
 }
 
@@ -160,6 +162,8 @@ static void config_defaults(struct sway_config *config) {
 	config->dragging_key = M_LEFT_CLICK;
 	config->resizing_key = M_RIGHT_CLICK;
 	config->floating_scroll = FSB_GAPS_INNER;
+	config->fsb_up = strdup("");
+	config->fsb_down = strdup("");
 	config->default_layout = L_NONE;
 	config->default_orientation = L_NONE;
 	config->font = strdup("monospace 10");

sway/handlers.c

@@ -743,6 +743,16 @@ bool handle_pointer_scroll(wlc_handle view, uint32_t time, const struct wlc_modi
 				arrange_windows(&root_container, -1, -1);
 				break;
 			}
+		case FSB_CUSTOM:
+			{
+				int amount = (int)_amount[0];
+				if (amount > 0) {
+					handle_command(config->fsb_up);
+				} else if (amount < 0) {
+					handle_command(config->fsb_down);
+				}
+				break;
+			}
 		}
 	}
 	return EVENT_PASSTHROUGH;