Allow for workspace renaming during exec handling

This change adds support for renaming a workspace when `exec` command
is being processed by keeping sway_workspace and pid_workspace names in
sync.

The change can be verified by running following command:

swaymsg exec <application>; swaymsg rename workspace number 1 to 5

Fixes: #3952

3 files changed, 20 insertions, 0 deletions

diff --git a/include/sway/tree/root.h b/include/sway/tree/root.h
index 9f6cd3bb..c4f84207 100644
--- a/include/sway/tree/root.h
+++ b/include/sway/tree/root.h
@@ -85,4 +85,6 @@ struct sway_container *root_find_container(
 
 void root_get_box(struct sway_root *root, struct wlr_box *box);
 
+void root_rename_pid_workspaces(const char *old_name, const char *new_name);
+
 #endif
diff --git a/sway/commands/rename.c b/sway/commands/rename.c
index 88377b09..3b855fdf 100644
--- a/sway/commands/rename.c
+++ b/sway/commands/rename.c
@@ -9,6 +9,7 @@
 #include "sway/output.h"
 #include "sway/tree/container.h"
 #include "sway/tree/workspace.h"
+#include "sway/tree/root.h"
 
 static const char expected_syntax[] =
         "Expected 'rename workspace <old_name> to <new_name>' or "
@@ -89,6 +90,9 @@ struct cmd_results *cmd_rename(int argc, char **argv) {
         }
 
         sway_log(SWAY_DEBUG, "renaming workspace '%s' to '%s'", workspace->name, new_name);
+
+        root_rename_pid_workspaces(workspace->name, new_name);
+
         free(workspace->name);
         workspace->name = new_name;
 
diff --git a/sway/tree/root.c b/sway/tree/root.c
index 0744192b..5dde9f22 100644
--- a/sway/tree/root.c
+++ b/sway/tree/root.c
@@ -390,3 +390,17 @@ void root_get_box(struct sway_root *root, struct wlr_box *box) {
         box->width = root->width;
         box->height = root->height;
 }
+
+void root_rename_pid_workspaces(const char *old_name, const char *new_name) {
+        if (!pid_workspaces.prev && !pid_workspaces.next) {
+                wl_list_init(&pid_workspaces);
+        }
+
+        struct pid_workspace *pw = NULL;
+        wl_list_for_each(pw, &pid_workspaces, link) {
+                if (strcmp(pw->workspace, old_name) == 0) {
+                        free(pw->workspace);
+                        pw->workspace = strdup(new_name);
+                }
+        }
+}