Antworten:
file-name-directory
macht was du verlangst.
Jedoch (file-name-directory "/home/sk/parent/")
(mit einem Schrägstrich) kehrt das gleiche Verzeichnis, nicht seine Eltern.
Das macht, was ich vermute, dass Sie wirklich wollen:
(file-name-directory (directory-file-name "/home/sk/parent/ab.el")) ; => "/home/sk/parent/"
(file-name-directory (directory-file-name "/home/sk/parent/")) ; => "/home/sk/"
(file-name-directory (directory-file-name "/home/sk/parent")) ; => "/home/sk/"
Und Bibliothek Dired + verwendet diese Funktion:
(defun diredp-parent-dir (file &optional relativep)
"Return the parent directory of FILE, or nil if none.
Optional arg RELATIVEP non-nil means return a relative name, that is,
just the parent component."
(let ((parent (file-name-directory (directory-file-name (expand-file-name file))))
relparent)
(when relativep
(setq relparent (file-name-nondirectory (directory-file-name parent))))
(and (not (equal parent file)) (or relparent parent))))
(defun parent-directory (dir)
(unless (equal "/" dir)
(file-name-directory (directory-file-name dir))))
Entnommen aus https://stackoverflow.com/a/14096693/5103881