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, 15 insertions, 0 deletions

diff --git a/include/sway/tree/root.h b/include/sway/tree/root.h
index edb7c817..d1f04a96 100644
--- a/include/sway/tree/root.h
+++ b/include/sway/tree/root.h
@@ -58,4 +58,19 @@ struct sway_container *root_workspace_for_pid(pid_t pid);
 
 void root_record_workspace_pid(pid_t pid);
 
+void root_for_each_workspace(void (*f)(struct sway_container *con, void *data),
+                void *data);
+
+void root_for_each_container(void (*f)(struct sway_container *con, void *data),
+                void *data);
+
+struct sway_container *root_find_output(
+                bool (*test)(struct sway_container *con, void *data), void *data);
+
+struct sway_container *root_find_workspace(
+                bool (*test)(struct sway_container *con, void *data), void *data);
+
+struct sway_container *root_find_container(
+                bool (*test)(struct sway_container *con, void *data), void *data);
+
 #endif