trash-settings.el

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;;; trash-settings.el - Intelligent integration with system trash

;; Use the system trash, except for temp files and stuff
(require 'cl)

(defcustom system-trash-exclude-names
  nil
  "List of file names to exclude from system trash.
The names in this variable are matched only against the basename
of the file to be deleted."
  :type '(repeat string)
  :group 'trash)

(defcustom system-trash-exclude-paths
  nil
  "List of absolute paths to exclude from system trash.
If a path to a directory is excluded, then all the contents of that directory are also excluded."
  :type '(repeat string)
  :group 'trash)

(defcustom system-trash-exclude-matches
  nil
  "List of regexps or functions matching file names to exclude from system trash.
The matches are only applied against the file name, not the path."
  :type '(repeat (choice regexp function))
  :group 'trash)

(defcustom system-trash-exclude-path-matches
  nil
  "List of regexps or functions matching paths to exclude from system trash.
The matches are applied against the full path."
  :type '(repeat (choice regexp function))
  :group 'trash)

(defun call-process-discard-output (program &rest args)
  "Execute program with args without saving any output.
In particular, no temp files are created."
  (eval (append `(call-process ,program nil nil nil) args)))

(defun string-begins-with-p (string beginning)
  "Return t if and only if string begins with beginning"
  (string-match-p (concat "^" (regexp-quote beginning)) string))

(defun file-excluded-from-system-trash-p (path)
  "Returns non-nil if file name is excluded from trash."
  (let ((basename (file-name-nondirectory path)))
    (or
     (some (apply-partially 'string= basename)
           system-trash-exclude-names)
     (some (apply-partially 'string-begins-with-p path)
           system-trash-exclude-paths)
     (some (lambda (match)
             (funcall
              (cond ((stringp match) 'string-match-p)
                    ((functionp protected-match) 'funcall)
                    (t 'ignore))
              match
              basename))
           system-trash-exclude-matches)
     (some (lambda (match)
             (funcall
              (cond ((stringp match) 'string-match-p)
                    ((functionp protected-match) 'funcall)
                    (t 'ignore))
              match
              path))
           system-trash-exclude-path-matches))))

(defun trash-or-rm (filename)
  "Attempt to move a file to the trash. If this fails, simply delete it.
This guarantees that any deletable file will either be trashed or deleted.
If the file is excluded from the trash, it is simply deleted."
  (unless (file-excluded-from-system-trash-p filename)
    (ignore-errors
      (call-process-discard-output "gvfs-trash" filename)))
  (when (file-exists-p filename)
    (call-process-discard-output "rm" "-rf" filename)))

(defalias 'system-move-file-to-trash 'trash-or-rm)

(defadvice delete-directory (around no-recursive-trash activate)
  "When trashing a directory, there's no need to trash its contents first."
  (if delete-by-moving-to-trash
    (move-file-to-trash directory)
    ad-do-it))

(defadvice dired-delete-file (around no-recursive-trash activate)
  "When trashing a directory, there's no need to trash its contents first.
There's also no need to ask, because it's undoable."
  (if delete-by-moving-to-trash
      (move-file-to-trash file)
    ad-do-it))