Implement criteria commands

Implements the following commands:

* for_window [...] <cmdlist>
* assign [...] <workspace>

sway/commands.c

@@ -93,12 +93,14 @@ void apply_seat_config(struct seat_config *seat_config) {
 
 /* Keep alphabetized */
 static struct cmd_handler handlers[] = {
+	{ "assign", cmd_assign },
 	{ "bar", cmd_bar },
 	{ "bindcode", cmd_bindcode },
 	{ "bindsym", cmd_bindsym },
 	{ "exec", cmd_exec },
 	{ "exec_always", cmd_exec_always },
 	{ "focus_follows_mouse", cmd_focus_follows_mouse },
+	{ "for_window", cmd_for_window },
 	{ "fullscreen", cmd_fullscreen },
 	{ "include", cmd_include },
 	{ "input", cmd_input },

sway/commands/assign.c

@@ -0,0 +1,57 @@
+#define _XOPEN_SOURCE 700
+#include <stdio.h>
+#include <string.h>
+#include "sway/commands.h"
+#include "sway/criteria.h"
+#include "list.h"
+#include "log.h"
+
+struct cmd_results *cmd_assign(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "assign", EXPECTED_AT_LEAST, 2))) {
+		return error;
+	}
+
+	char *criteria = *argv++;
+
+	if (strncmp(*argv, "→", strlen("→")) == 0) {
+		if (argc < 3) {
+			return cmd_results_new(CMD_INVALID, "assign", "Missing workspace");
+		}
+		argv++;
+	}
+
+	char *movecmd = "move container to workspace ";
+	int arglen = strlen(movecmd) + strlen(*argv) + 1;
+	char *cmdlist = calloc(1, arglen);
+	if (!cmdlist) {
+		return cmd_results_new(CMD_FAILURE, "assign", "Unable to allocate command list");
+	}
+	snprintf(cmdlist, arglen, "%s%s", movecmd, *argv);
+
+	struct criteria *crit = malloc(sizeof(struct criteria));
+	if (!crit) {
+		free(cmdlist);
+		return cmd_results_new(CMD_FAILURE, "assign", "Unable to allocate criteria");
+	}
+	crit->crit_raw = strdup(criteria);
+	crit->cmdlist = cmdlist;
+	crit->tokens = create_list();
+	char *err_str = extract_crit_tokens(crit->tokens, crit->crit_raw);
+
+	if (err_str) {
+		error = cmd_results_new(CMD_INVALID, "assign", err_str);
+		free(err_str);
+		free_criteria(crit);
+	} else if (crit->tokens->length == 0) {
+		error = cmd_results_new(CMD_INVALID, "assign", "Found no name/value pairs in criteria");
+		free_criteria(crit);
+	} else if (list_seq_find(config->criteria, criteria_cmp, crit) != -1) {
+		wlr_log(L_DEBUG, "assign: Duplicate, skipping.");
+		free_criteria(crit);
+	} else {
+		wlr_log(L_DEBUG, "assign: '%s' -> '%s' added", crit->crit_raw, crit->cmdlist);
+		list_add(config->criteria, crit);
+	}
+	return error ? error : cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}

sway/commands/for_window.c

@@ -0,0 +1,41 @@
+#define _XOPEN_SOURCE 500
+#include <string.h>
+#include "sway/commands.h"
+#include "sway/criteria.h"
+#include "list.h"
+#include "log.h"
+#include "stringop.h"
+
+struct cmd_results *cmd_for_window(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "for_window", EXPECTED_AT_LEAST, 2))) {
+		return error;
+	}
+	// add command to a criteria/command pair that is run against views when they appear.
+	char *criteria = argv[0], *cmdlist = join_args(argv + 1, argc - 1);
+
+	struct criteria *crit = malloc(sizeof(struct criteria));
+	if (!crit) {
+		return cmd_results_new(CMD_FAILURE, "for_window", "Unable to allocate criteria");
+	}
+	crit->crit_raw = strdup(criteria);
+	crit->cmdlist = cmdlist;
+	crit->tokens = create_list();
+	char *err_str = extract_crit_tokens(crit->tokens, crit->crit_raw);
+
+	if (err_str) {
+		error = cmd_results_new(CMD_INVALID, "for_window", err_str);
+		free(err_str);
+		free_criteria(crit);
+	} else if (crit->tokens->length == 0) {
+		error = cmd_results_new(CMD_INVALID, "for_window", "Found no name/value pairs in criteria");
+		free_criteria(crit);
+	} else if (list_seq_find(config->criteria, criteria_cmp, crit) != -1) {
+		wlr_log(L_DEBUG, "for_window: Duplicate, skipping.");
+		free_criteria(crit);
+	} else {
+		wlr_log(L_DEBUG, "for_window: '%s' -> '%s' added", crit->crit_raw, crit->cmdlist);
+		list_add(config->criteria, crit);
+	}
+	return error ? error : cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}

sway/meson.build

@@ -26,6 +26,7 @@ sway_sources = files(
 	'config/seat.c',
 	'config/input.c',
 
+	'commands/assign.c',
 	'commands/bar.c',
 	'commands/bind.c',
 	'commands/default_orientation.c',
@@ -34,6 +35,7 @@ sway_sources = files(
 	'commands/exec_always.c',
 	'commands/focus.c',
 	'commands/focus_follows_mouse.c',
+	'commands/for_window.c',
 	'commands/fullscreen.c',
 	'commands/kill.c',
 	'commands/opacity.c',

sway/tree/view.c

@@ -2,8 +2,11 @@
 #include <wayland-server.h>
 #include <wlr/types/wlr_output_layout.h>
 #include "log.h"
+#include "sway/criteria.h"
+#include "sway/commands.h"
 #include "sway/ipc-server.h"
 #include "sway/output.h"
+#include "sway/input/seat.h"
 #include "sway/tree/container.h"
 #include "sway/tree/layout.h"
 #include "sway/tree/view.h"
@@ -208,6 +211,28 @@ static void view_handle_container_reparent(struct wl_listener *listener,
 	}
 }
 
+static void view_execute_criteria(struct sway_view *view) {
+	struct sway_seat *seat = input_manager_current_seat(input_manager);
+	struct sway_container *prior_workspace =
+		container_parent(view->swayc, C_WORKSPACE);
+	list_t *criteria = criteria_for(view->swayc);
+	for (int i = 0; i < criteria->length; i++) {
+		struct criteria *crit = criteria->items[i];
+		wlr_log(L_DEBUG, "for_window '%s' matches new view %p, cmd: '%s'",
+				crit->crit_raw, view, crit->cmdlist);
+		struct cmd_results *res = execute_command(crit->cmdlist, NULL);
+		if (res->status != CMD_SUCCESS) {
+			wlr_log(L_ERROR, "Command '%s' failed: %s", res->input, res->error);
+		}
+		free_cmd_results(res);
+		// view must be focused for commands to affect it,
+		// so always refocus in-between command lists
+		seat_set_focus(seat, view->swayc);
+	}
+	list_free(criteria);
+	seat_set_focus(seat, seat_get_focus_inactive(seat, prior_workspace));
+}
+
 void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
 	if (!sway_assert(view->surface == NULL, "cannot map mapped view")) {
 		return;
@@ -234,6 +259,8 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
 
 	view_damage(view, true);
 	view_handle_container_reparent(&view->container_reparent, NULL);
+
+	view_execute_criteria(view);
 }
 
 void view_unmap(struct sway_view *view) {