feat(workspaces): add +workspace/delete

For deleting saved workspaces (saved with `+workspace/save` or
`+workspace-save`).

Also binds `SPC TAB D` (for evil users) and `C-c w K` (for non-evil
users) to it.

Fix: #4399
Close: #7869
Co-authored-by: sriramsk1999 <sriramsk1999@users.noreply.github.com>

modules/config/default/+emacs-bindings.el

@@ -413,6 +413,7 @@
         :desc "Create workspace"             "c" #'+workspace/new
         :desc "Create named workspace"       "C" #'+workspace/new-named
         :desc "Delete workspace"             "k" #'+workspace/kill
+        :desc "Delete saved workspace"       "K" #'+workspace/delete
         :desc "Save workspace"               "S" #'+workspace/save
         :desc "Switch to other workspace"    "o" #'+workspace/other
         :desc "Switch to left workspace"     "p" #'+workspace/switch-left

modules/config/default/+evil-bindings.el

@@ -382,6 +382,7 @@
         :desc "Save workspace to file"    "s"   #'+workspace/save
         :desc "Kill session"              "x"   #'+workspace/kill-session
         :desc "Kill this workspace"       "d"   #'+workspace/kill
+        :desc "Delete saved workspace"    "D"   #'+workspace/delete
         :desc "Rename workspace"          "r"   #'+workspace/rename
         :desc "Restore last session"      "R"   #'+workspace/restore-last-session
         :desc "Next workspace"            "]"   #'+workspace/switch-right

modules/ui/workspaces/autoload/workspaces.el

@@ -122,6 +122,24 @@ Returns t on success, nil otherwise."
     (and (member name (persp-list-persp-names-in-file fname))
          t)))
 
+;;;###autoload
+(defun +workspace-delete (workspace)
+  "Delete WORKSPACE from the saved workspaces in `persp-save-dir'.
+
+Return t if WORKSPACE was successfully deleted. Throws error if WORKSPACE is not
+found or wasn't saved with `+workspace-save'."
+  (let* ((fname (expand-file-name +workspaces-data-file persp-save-dir))
+         (workspace-name (if (stringp workspace) workspace (persp-name workspace)))
+         (workspace-names (persp-list-persp-names-in-file fname))
+         (workspace-idx (cl-position workspace-name workspace-names :test #'equal)))
+    (unless workspace-idx
+      (error "Couldn't find saved workspace '%s'" workspace-name))
+    (doom-file-write
+     fname (list (cl-remove-if (lambda (ws) (equal workspace-name (nth 1 ws)))
+                               (doom-file-read fname :by 'read)
+                               :count 1)))
+    (not (member name (persp-list-persp-names-in-file fname)))))
+
 ;;;###autoload
 (defun +workspace-new (name)
   "Create a new workspace named NAME. If one already exists, return nil.
@@ -267,6 +285,23 @@ workspace to delete."
           (+workspace-message (format "Deleted '%s' workspace" name) 'success)))
     ('error (+workspace-error ex t))))
 
+;;;###autoload
+(defun +workspace/delete (name)
+  "Delete a saved workspace in `persp-save-dir'.
+
+Can only selete workspaces saved with `+workspace/save' or `+workspace-save'."
+  (interactive
+   (list
+    (completing-read "Delete saved workspace: "
+                     (cl-loop with wsfile = (doom-path persp-save-dir +workspaces-data-file)
+                              for p in (persp-list-persp-names-in-file wsfile)
+                              collect p))))
+  (and (condition-case-unless-debug ex
+           (or (+workspace-delete name)
+               (+workspace-error (format "Couldn't delete '%s' workspace" name)))
+         ('error (+workspace-error ex t)))
+       (+workspace-message (format "Deleted '%s' workspace" name) 'success)))
+
 ;;;###autoload
 (defun +workspace/kill-session (&optional interactive)
   "Delete the current session, all workspaces, windows and their buffers."