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

1 files changed, 26 insertions, 0 deletions

diff --git a/include/sway/scratchpad.h b/include/sway/scratchpad.h
new file mode 100644
index 00000000..5af5256f
--- /dev/null
+++ b/include/sway/scratchpad.h
@@ -0,0 +1,26 @@
+#ifndef _SWAY_SCRATCHPAD_H
+#define _SWAY_SCRATCHPAD_H
+
+#include "tree/container.h"
+
+/**
+ * Move a container to the scratchpad.
+ */
+void scratchpad_add_container(struct sway_container *con);
+
+/**
+ * Remove a container from the scratchpad.
+ */
+void scratchpad_remove_container(struct sway_container *con);
+
+/**
+ * Show or hide the next container on the scratchpad.
+ */
+void scratchpad_toggle_auto(void);
+
+/**
+ * Show or hide a specific container on the scratchpad.
+ */
+void scratchpad_toggle_container(struct sway_container *con);
+
+#endif