Implement scratchpad

Implements the following commands:

* move scratchpad
* scratchpad show
* [criteria] scratchpad show

Also fixes these:

* Fix memory leak when executing command with criteria
(use `list_free(views)` instead of `free(views)`)
* Fix crash when running `move to` with no further arguments

2 files changed, 53 insertions, 3 deletions

diff --git a/sway/commands/move.c b/sway/commands/move.c
index 6ec050a8..1940043d 100644
--- a/sway/commands/move.c
+++ b/sway/commands/move.c
@@ -9,6 +9,7 @@
 #include "sway/input/cursor.h"
 #include "sway/input/seat.h"
 #include "sway/output.h"
+#include "sway/scratchpad.h"
 #include "sway/tree/arrange.h"
 #include "sway/tree/container.h"
 #include "sway/tree/layout.h"
@@ -296,6 +297,19 @@ static struct cmd_results *move_to_position(struct sway_container *container,
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }
 
+static struct cmd_results *move_to_scratchpad(struct sway_container *con) {
+	if (con->type != C_CONTAINER && con->type != C_VIEW) {
+		return cmd_results_new(CMD_INVALID, "move",
+				"Only views and containers can be moved to the scratchpad");
+	}
+	if (con->scratchpad) {
+		return cmd_results_new(CMD_INVALID, "move",
+				"Container is already in the scratchpad");
+	}
+	scratchpad_add_container(con);
+	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}
+
 struct cmd_results *cmd_move(int argc, char **argv) {
 	struct cmd_results *error = NULL;
 	if ((error = checkarg(argc, "move", EXPECTED_AT_LEAST, 1))) {
@@ -317,10 +331,9 @@ struct cmd_results *cmd_move(int argc, char **argv) {
 	} else if (strcasecmp(argv[0], "workspace") == 0) {
 		return cmd_move_workspace(current, argc, argv);
 	} else if (strcasecmp(argv[0], "scratchpad") == 0
-			|| (strcasecmp(argv[0], "to") == 0
+			|| (strcasecmp(argv[0], "to") == 0 && argc == 2
 				&& strcasecmp(argv[1], "scratchpad") == 0)) {
-		// TODO: scratchpad
-		return cmd_results_new(CMD_FAILURE, "move", "Unimplemented");
+		return move_to_scratchpad(current);
 	} else if (strcasecmp(argv[0], "position") == 0) {
 		return move_to_position(current, argc, argv);
 	} else if (strcasecmp(argv[0], "absolute") == 0) {
diff --git a/sway/commands/scratchpad.c b/sway/commands/scratchpad.c
new file mode 100644
index 00000000..8a529cb4
--- /dev/null
+++ b/sway/commands/scratchpad.c
@@ -0,0 +1,37 @@
+#include "log.h"
+#include "sway/commands.h"
+#include "sway/config.h"
+#include "sway/scratchpad.h"
+#include "sway/server.h"
+#include "sway/tree/container.h"
+
+struct cmd_results *cmd_scratchpad(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "scratchpad", EXPECTED_EQUAL_TO, 1))) {
+		return error;
+	}
+	if (strcmp(argv[0], "show") != 0) {
+		return cmd_results_new(CMD_INVALID, "scratchpad",
+				"Expected 'scratchpad show'");
+	}
+	if (!server.scratchpad->length) {
+		return cmd_results_new(CMD_INVALID, "scratchpad",
+				"Scratchpad is empty");
+	}
+
+	if (config->handler_context.using_criteria) {
+		// If using criteria, this command is executed for every container which
+		// matches the criteria. If this container isn't in the scratchpad,
+		// we'll just silently return a success.
+		struct sway_container *con = config->handler_context.current_container;
+		wlr_log(WLR_INFO, "cmd_scratchpad(%s)", con->name);
+		if (!con->scratchpad) {
+			return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+		}
+		scratchpad_toggle_container(con);
+	} else {
+		scratchpad_toggle_auto();
+	}
+
+	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}