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, 3 insertions, 5 deletions

diff --git a/sway/ipc-server.c b/sway/ipc-server.c
index dad1f310..34e940ad 100644
--- a/sway/ipc-server.c
+++ b/sway/ipc-server.c
@@ -522,7 +522,7 @@ void ipc_client_disconnect(struct ipc_client *client) {
 
 static void ipc_get_workspaces_callback(struct sway_container *workspace,
                 void *data) {
-        if (workspace->type != C_WORKSPACE) {
+        if (!sway_assert(workspace->type == C_WORKSPACE, "Expected a workspace")) {
                 return;
         }
         json_object *workspace_json = ipc_json_describe_container(workspace);
@@ -631,8 +631,7 @@ void ipc_client_handle_command(struct ipc_client *client) {
         case IPC_GET_WORKSPACES:
         {
                 json_object *workspaces = json_object_new_array();
-                container_for_each_descendant(&root_container,
-                                ipc_get_workspaces_callback, workspaces);
+                root_for_each_workspace(ipc_get_workspaces_callback, workspaces);
                 const char *json_string = json_object_to_json_string(workspaces);
                 client_valid =
                         ipc_send_reply(client, json_string, (uint32_t)strlen(json_string));
@@ -729,8 +728,7 @@ void ipc_client_handle_command(struct ipc_client *client) {
         case IPC_GET_MARKS:
         {
                 json_object *marks = json_object_new_array();
-                container_descendants(&root_container, C_VIEW, ipc_get_marks_callback,
-                                marks);
+                root_for_each_container(ipc_get_marks_callback, marks);
                 const char *json_string = json_object_to_json_string(marks);
                 client_valid =
                         ipc_send_reply(client, json_string, (uint32_t)strlen(json_string));