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, 2 insertions, 13 deletions

diff --git a/sway/criteria.c b/sway/criteria.c
index a5df1eef..81c2325a 100644
--- a/sway/criteria.c
+++ b/sway/criteria.c
@@ -167,8 +167,7 @@ static bool criteria_matches_view(struct criteria *criteria,
                         return false;
                 }
                 list_t *urgent_views = create_list();
-                container_for_each_descendant(&root_container,
-                                find_urgent_iterator, urgent_views);
+                root_for_each_container(find_urgent_iterator, urgent_views);
                 list_stable_sort(urgent_views, cmp_urgent);
                 struct sway_view *target;
                 if (criteria->urgent == 'o') { // oldest
@@ -228,17 +227,7 @@ list_t *criteria_get_views(struct criteria *criteria) {
                 .criteria = criteria,
                 .matches = matches,
         };
-        container_for_each_descendant(&root_container,
-                criteria_get_views_iterator, &data);
-
-        // Scratchpad items which are hidden are not in the tree.
-        for (int i = 0; i < root_container.sway_root->scratchpad->length; ++i) {
-                struct sway_container *con =
-                        root_container.sway_root->scratchpad->items[i];
-                if (!con->parent) {
-                        criteria_get_views_iterator(con, &data);
-                }
-        }
+        root_for_each_container(criteria_get_views_iterator, &data);
         return matches;
 }