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48 lines
1.8 KiB
EmacsLisp
48 lines
1.8 KiB
EmacsLisp
;; When we are about to make a backup file,
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;; uncompress the file we visited
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;; so that making the backup can work properly.
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;; This is used as a write-file-hook.
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(defun uncompress-backup-file ()
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(and buffer-file-name make-backup-files (not buffer-backed-up)
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(not (file-exists-p buffer-file-name))
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(call-process "uncompress" nil nil nil buffer-file-name))
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nil)
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(or (assoc "\\.Z$" auto-mode-alist)
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(setq auto-mode-alist
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(cons '("\\.Z$" . uncompress-while-visiting) auto-mode-alist)))
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(defun uncompress-while-visiting ()
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"Temporary \"major mode\" used for .Z files, to uncompress the contents.
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It then selects a major mode from the uncompressed file name and contents."
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(if (and (not (null buffer-file-name))
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(string-match "\\.Z$" buffer-file-name))
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(set-visited-file-name
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(substring buffer-file-name 0 (match-beginning 0))))
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(message "Uncompressing...")
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(let ((buffer-read-only nil))
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(shell-command-on-region (point-min) (point-max) "uncompress" t))
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(message "Uncompressing...done")
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(set-buffer-modified-p nil)
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(make-local-variable 'write-file-hooks)
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(or (memq 'uncompress-backup-file write-file-hooks)
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(setq write-file-hooks (cons 'uncompress-backup-file write-file-hooks)))
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(normal-mode))
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(or (memq 'find-compressed-version find-file-not-found-hooks)
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(setq find-file-not-found-hooks
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(cons 'find-compressed-version find-file-not-found-hooks)))
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(defun find-compressed-version ()
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"Hook to read and uncompress the compressed version of a file."
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;; Just pretend we had visited the compressed file,
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;; and uncompress-while-visiting will do the rest.
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(if (file-exists-p (concat buffer-file-name ".Z"))
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(progn
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(setq buffer-file-name (concat buffer-file-name ".Z"))
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(insert-file-contents buffer-file-name t)
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(goto-char (point-min))
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(setq error nil)
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t)))
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