(defun uncompress-while-visiting () "Temporary \"major mode\" used for .Z files, to uncompress the contents. It then selects a major mode from the uncompressed file name and contents." (if (and (not (null buffer-file-name)) (string-match "\\.Z$" buffer-file-name)) (set-visited-file-name (substring buffer-file-name 0 (match-beginning 0)))) (message "Uncompressing...") (let ((buffer-read-only nil)) (shell-command-on-region (point-min) (point-max) "uncompress" t)) (message "Uncompressing...done") (set-buffer-modified-p nil) (normal-mode)) (setq auto-mode-alist (cons '("\\.Z$" . uncompress-while-visiting) auto-mode-alist)) (defun find-compressed-version () "Hook to read and uncompress the compressed version of a file." ;; Just pretend we had visited the compressed file, ;; and uncompress-while-visiting will do the rest. (if (file-exists-p (concat buffer-file-name ".Z")) (progn (setq buffer-file-name (concat buffer-file-name ".Z")) (insert-file-contents buffer-file-name t) (goto-char (point-min)) (setq error nil) t))) (setq find-file-not-found-hooks (cons 'find-compressed-version find-file-not-found-hooks))