Implement iterators per container type

This introduces the following `for_each` functions:

* root_for_each_workspace
* root_for_each_container
* output_for_each_workspace
* output_for_each_container
* workspace_for_each_container

And introduces the following `find` functions:

* root_find_output
* root_find_workspace
* root_find_container
* output_find_workspace
* output_find_container
* workspace_find_container
* container_find_child

And removes the following functions:

* container_descendants
* container_for_each_descendant
* container_find

This change is preparing the way for demoting sway_container. Eventually
these functions will accept and return sway_outputs, sway_workspaces and
sway_containers (meaning a C_CONTAINER or C_VIEW).

This change also makes it easy to handle abnormalities like the
workspace floating list, root's scratchpad list and (once implemented)
root's saved workspaces list for when there's no connected outputs.

1 files changed, 21 insertions, 41 deletions

diff --git a/sway/tree/container.c b/sway/tree/container.c
index 337245fd..1ceae175 100644
--- a/sway/tree/container.c
+++ b/sway/tree/container.c
@@ -432,8 +432,10 @@ struct sway_container *container_close(struct sway_container *con) {
 
         if (con->type == C_VIEW) {
                 view_close(con->sway_view);
-        } else {
-                container_for_each_descendant(con, container_close_func, NULL);
+        } else if (con->type == C_CONTAINER) {
+                container_for_each_child(con, container_close_func, NULL);
+        } else if (con->type == C_WORKSPACE) {
+                workspace_for_each_container(con, container_close_func, NULL);
         }
 
         return parent;
@@ -465,23 +467,12 @@ struct sway_container *container_view_create(struct sway_container *sibling,
         return swayc;
 }
 
-void container_descendants(struct sway_container *root,
-                enum sway_container_type type,
-                void (*func)(struct sway_container *item, void *data), void *data) {
-        if (!root->children || !root->children->length) {
-                return;
-        }
-        for (int i = 0; i < root->children->length; ++i) {
-                struct sway_container *item = root->children->items[i];
-                if (item->type == type) {
-                        func(item, data);
-                }
-                container_descendants(item, type, func, data);
-        }
-}
-
-struct sway_container *container_find(struct sway_container *container,
+struct sway_container *container_find_child(struct sway_container *container,
                 bool (*test)(struct sway_container *view, void *data), void *data) {
+        if (!sway_assert(container->type == C_CONTAINER ||
+                                container->type == C_VIEW, "Expected a container or view")) {
+                return NULL;
+        }
         if (!container->children) {
                 return NULL;
         }
@@ -489,15 +480,11 @@ struct sway_container *container_find(struct sway_container *container,
                 struct sway_container *child = container->children->items[i];
                 if (test(child, data)) {
                         return child;
-                } else {
-                        struct sway_container *res = container_find(child, test, data);
-                        if (res) {
-                                return res;
-                        }
                 }
-        }
-        if (container->type == C_WORKSPACE) {
-                return container_find(container->sway_workspace->floating, test, data);
+                struct sway_container *res = container_find_child(child, test, data);
+                if (res) {
+                        return res;
+                }
         }
         return NULL;
 }
@@ -743,26 +730,20 @@ struct sway_container *container_at(struct sway_container *workspace,
         return NULL;
 }
 
-void container_for_each_descendant(struct sway_container *container,
+void container_for_each_child(struct sway_container *container,
                 void (*f)(struct sway_container *container, void *data),
                 void *data) {
-        if (!container) {
+        if (!sway_assert(container->type == C_CONTAINER ||
+                                container->type == C_VIEW, "Expected a container or view")) {
                 return;
         }
+        f(container, data);
         if (container->children)  {
                 for (int i = 0; i < container->children->length; ++i) {
                         struct sway_container *child = container->children->items[i];
-                        container_for_each_descendant(child, f, data);
+                        container_for_each_child(child, f, data);
                 }
         }
-        if (container->type == C_WORKSPACE)  {
-                struct sway_container *floating = container->sway_workspace->floating;
-                for (int i = 0; i < floating->children->length; ++i) {
-                        struct sway_container *child = floating->children->items[i];
-                        container_for_each_descendant(child, f, data);
-                }
-        }
-        f(container, data);
 }
 
 bool container_has_ancestor(struct sway_container *descendant,
@@ -1198,13 +1179,12 @@ void container_set_dirty(struct sway_container *container) {
         list_add(server.dirty_containers, container);
 }
 
-static bool find_urgent_iterator(struct sway_container *con,
-                void *data) {
+static bool find_urgent_iterator(struct sway_container *con, void *data) {
         return con->type == C_VIEW && view_is_urgent(con->sway_view);
 }
 
 bool container_has_urgent_child(struct sway_container *container) {
-        return container_find(container, find_urgent_iterator, NULL);
+        return container_find_child(container, find_urgent_iterator, NULL);
 }
 
 void container_end_mouse_operation(struct sway_container *container) {
@@ -1236,7 +1216,7 @@ void container_set_fullscreen(struct sway_container *container, bool enable) {
                 container_set_fullscreen(workspace->sway_workspace->fullscreen, false);
         }
 
-        container_for_each_descendant(container, set_fullscreen_iterator, &enable);
+        container_for_each_child(container, set_fullscreen_iterator, &enable);
 
         container->is_fullscreen = enable;