Add some documentation comments

This is mostly setting a precedent, I hope that others will continue to
write docs for more headers.

Ref #218

include/container.h

@@ -5,42 +5,72 @@ typedef struct sway_container swayc_t;
 
 #include "layout.h"
 
-enum swayc_types{
-	C_ROOT,
-	C_OUTPUT,
-	C_WORKSPACE,
-	C_CONTAINER,
-	C_VIEW,
+/**
+ * Different kinds of containers.
+ * 
+ * This enum is in order. A container will never be inside of a container below
+ * it on this list.
+ */
+enum swayc_types {
+	C_ROOT,				/**< The root container. Only one of these ever exists. */
+	C_OUTPUT,			/**< An output (aka monitor, head, etc). */
+	C_WORKSPACE,		/**< A workspace. */
+	C_CONTAINER,		/**< A manually created container. */
+	C_VIEW,				/**< A view (aka window). */
 	// Keep last
 	C_TYPES,
 };
 
-
-enum swayc_layouts{
-	L_NONE,
+/**
+ * Different ways to arrange a container.
+ */
+enum swayc_layouts {
+	L_NONE, 			/**< Used for containers that have no layout (views, root) */
 	L_HORIZ,
 	L_VERT,
 	L_STACKED,
 	L_TABBED,
-	L_FLOATING,
+	L_FLOATING,			/**< A psuedo-container, removed from the tree, to hold floating windows */
 	// Keep last
 	L_LAYOUTS,
 };
 
+/**
+ * Stores information about a container.
+ *
+ * The tree is made of these. Views are containers that cannot have children.
+ */
 struct sway_container {
+	/**
+	 * If this container maps to a WLC object, this is set to that object's
+	 * handle. Otherwise, NULL.
+	 */
 	wlc_handle handle;
 
 	enum swayc_types type;
 	enum swayc_layouts layout;
 
-	// Not including borders or margins
+	/**
+	 * Width and height of this container, without borders or gaps.
+	 */
 	double width, height;
 
-	// Used for setting floating geometry
+	/**
+	 * Views may request geometry, which is stored in this and ignored until
+	 * the views are floated.
+	 */
 	int desired_width, desired_height;
 
+	/**
+	 * The coordinates that this view appear at, relative to the output they
+	 * are located on.
+	 */
 	double x, y;
 
+	/**
+	 * False if this view is invisible. It could be in the scratchpad or on a
+	 * workspace that is not shown.
+	 */
 	bool visible;
 	bool is_floating;
 	bool is_focused;
@@ -50,9 +80,18 @@ struct sway_container {
 	int gaps;
 
 	list_t *children;
+	/**
+	 * Children of this container that are floated.
+	 */
 	list_t *floating;
 
+	/**
+	 * The parent of this container. NULL for the root container.
+	 */
 	struct sway_container *parent;
+	/**
+	 * Which of this container's children has focus.
+	 */
 	struct sway_container *focused;
 };
 
@@ -60,68 +99,147 @@ enum visibility_mask {
 	VISIBLE = true
 } visible;
 
-// Container Creation
-
+/**
+ * Allocates a new output container.
+ */
 swayc_t *new_output(wlc_handle handle);
+/**
+ * Allocates a new workspace container.
+ */
 swayc_t *new_workspace(swayc_t *output, const char *name);
-// Creates container Around child (parent child) -> (parent (container child))
+/**
+ * Allocates a new container and places a child into it.
+ *
+ * This is used from the split command, which creates a new container with the
+ * requested layout and replaces the focused container in the tree with the new
+ * one. Then the removed container is added as a child of the new container.
+ */
 swayc_t *new_container(swayc_t *child, enum swayc_layouts layout);
-// Creates view as a sibling of current focused container, or as child of a workspace
+/**
+ * Allocates a new view container.
+ *
+ * Pass in a sibling view, or a workspace to become this container's parent.
+ */
 swayc_t *new_view(swayc_t *sibling, wlc_handle handle);
-// Creates view as a new floating view which is in the active workspace
+/**
+ * Allocates a new floating view in the active workspace.
+ */
 swayc_t *new_floating_view(wlc_handle handle);
 
-// Container Destroying
-
+/**
+ * Frees an output's container.
+ */
 swayc_t *destroy_output(swayc_t *output);
-// Destroys workspace if empty and returns parent pointer, else returns NULL
+/**
+ * Destroys a workspace container and returns the parent pointer, or NULL.
+ */
 swayc_t *destroy_workspace(swayc_t *workspace);
-// Destroyes container and all parent container if they are empty, returns
-// topmost non-empty parent. returns NULL otherwise
+/**
+ * Destroys a container and all empty parents. Returns the topmost non-empty
+ * parent container, or NULL.
+ */
 swayc_t *destroy_container(swayc_t *container);
-// Destroys view and all empty parent containers. return topmost non-empty
-// parent
+/**
+ * Destroys a view container and all empty parents. Returns the topmost
+ * non-empty parent container, or NULL.
+ */
 swayc_t *destroy_view(swayc_t *view);
 
-// Container Lookup
-
+/**
+ * Finds a container based on test criteria. Returns the first container that
+ * passes the test.
+ */
 swayc_t *swayc_by_test(swayc_t *container, bool (*test)(swayc_t *view, void *data), void *data);
+/**
+ * Finds a parent container with the given swayc_type.
+ */
 swayc_t *swayc_parent_by_type(swayc_t *container, enum swayc_types);
+/**
+ * Finds a parent with the given swayc_layout.
+ */
 swayc_t *swayc_parent_by_layout(swayc_t *container, enum swayc_layouts);
-// Follow focused until type/layout
+/**
+ * Finds the bottom-most focused container of a type.
+ */
 swayc_t *swayc_focus_by_type(swayc_t *container, enum swayc_types);
+/**
+ * Finds the bottom-most focused container of a layout.
+ */
 swayc_t *swayc_focus_by_layout(swayc_t *container, enum swayc_layouts);
 
-
+/**
+ * Gets the swayc_t associated with a wlc_handle.
+ */
 swayc_t *swayc_by_handle(wlc_handle handle);
+/**
+ * Gets the named swayc_t.
+ */
 swayc_t *swayc_by_name(const char *name);
+/**
+ * Gets the active output's container.
+ */
 swayc_t *swayc_active_output(void);
+/**
+ * Gets the active workspace's container.
+ */
 swayc_t *swayc_active_workspace(void);
+/**
+ * Gets the workspace for the given view container.
+ */
 swayc_t *swayc_active_workspace_for(swayc_t *view);
-// set focus to current pointer location and return focused container
+/**
+ * Finds the container currently underneath the pointer.
+ */
 swayc_t *container_under_pointer(void);
 
-// Container information
-
+/**
+ * Returns true if a container is fullscreen.
+ */
 bool swayc_is_fullscreen(swayc_t *view);
+/**
+ * Returns true if this view is focused.
+ */
 bool swayc_is_active(swayc_t *view);
-// Is `parent` the parent of `child`
+/**
+ * Returns true if the parent is an ancestor of the child.
+ */
 bool swayc_is_parent_of(swayc_t *parent, swayc_t *child);
-// Is `child` a child of `parent`
+/**
+ * Returns true if the child is a desecendant of the parent.
+ */
 bool swayc_is_child_of(swayc_t *child, swayc_t *parent);
-// Return gap of specified container
+/**
+ * Returns the gap (padding) of the container.
+ *
+ * This returns the inner gaps for a view, the outer gaps for a workspace, and
+ * 0 otherwise.
+ */
 int swayc_gap(swayc_t *container);
 
-// Mapping functions
-
+/**
+ * Maps a container's children over a function.
+ */
 void container_map(swayc_t *, void (*f)(swayc_t *, void *), void *);
 
-// Mappings
+/**
+ * Set a view as visible or invisible.
+ *
+ * This will perform the required wlc calls as well; it is not sufficient to
+ * simply toggle the boolean in swayc_t.
+ */
 void set_view_visibility(swayc_t *view, void *data);
-// Set or add to gaps
+/**
+ * Set the gaps value for a view.
+ */
 void set_gaps(swayc_t *view, void *amount);
+/**
+ * Add to the gaps value for a view.
+ */
 void add_gaps(swayc_t *view, void *amount);
 
+/**
+ * Issue wlc calls to make the visibility of a container consistent.
+ */
 void update_visibility(swayc_t *container);
 
 #endif