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annotate emacs/compress.el @ 0:509549c55989

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author Henry S. Thompson <ht@inf.ed.ac.uk>
date Tue, 25 May 2021 13:57:42 -0400
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Henry S. Thompson <ht@inf.ed.ac.uk>
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1 ;;; Last edited: Thu Oct 3 12:28:00 1991
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2 ;;; Handle compressed files
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3 ;;; adapted by Henry S. Thompson from Miles Bader from ???
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4 (provide 'compress)
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5
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6 (defun uncompress-while-visiting ()
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7 "Temporary \"major mode\" used for .[gzZ] files, to uncompress the contents.
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8 It then selects a major mode from the uncompressed file name and contents."
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9 (if (and (not (null buffer-file-name))
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10 (string-match "\\.g?[zZ]$" buffer-file-name))
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11 (set-visited-file-name
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12 (substring buffer-file-name 0 (match-beginning 0))))
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13 (message "Uncompressing...")
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14 (let ((buffer-read-only nil))
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15 (shell-command-on-region (point-min) (point-max) "zcat" t))
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16 (message "Uncompressing...done")
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17 (set-buffer-modified-p nil)
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18 (normal-mode))
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19
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Henry S. Thompson <ht@inf.ed.ac.uk>
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20 (setq auto-mode-alist
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21 (cons '("\\.g?[zZ]$" . uncompress-while-visiting) auto-mode-alist))
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22
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Henry S. Thompson <ht@inf.ed.ac.uk>
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23 (defun find-compressed-version ()
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24 "Hook to read and uncompress the compressed version of a file."
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Henry S. Thompson <ht@inf.ed.ac.uk>
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25 ;; Just pretend we had visited the compressed file,
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Henry S. Thompson <ht@inf.ed.ac.uk>
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26 ;; and uncompress-while-visiting will do the rest.
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Henry S. Thompson <ht@inf.ed.ac.uk>
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27 (let ((exts '("gz" "z" "Z")) ext found)
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28 (while (and exts (setq ext (car exts)) (not found))
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29 (if (file-exists-p (concat buffer-file-name "." ext))
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30 (progn
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31 (setq buffer-file-name (concat buffer-file-name "." ext))
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32 (insert-file-contents buffer-file-name t)
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33 (goto-char (point-min))
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34 (setq error nil)
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35 t)
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36 (setq exts (cdr exts))))))
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37
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38 (setq find-file-not-found-hooks
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39 (cons 'find-compressed-version find-file-not-found-hooks))
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40
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Henry S. Thompson <ht@inf.ed.ac.uk>
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41 (defun compress-again ()
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42 "Hook to compress the uncompressed version of a file."
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43 (let ((exts '("gz" "z" "Z")) ext found)
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44 (while (and exts (setq ext (car exts)) (not found))
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45 (if (file-exists-p (concat buffer-file-name "." ext))
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46 (let ((here (current-buffer))
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47 (fake-buffer-file-name (concat buffer-file-name "." ext))
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48 (require-final-newline nil))
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49 (set-buffer (get-buffer-create " *compress*"))
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50 (erase-buffer)
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51 (insert-buffer here)
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52 (message "Compressing...")
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53 (shell-command-on-region (point-min) (point-max)
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Henry S. Thompson <ht@inf.ed.ac.uk>
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54 (if (equal "Z" ext)
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55 "compress"
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56 "gzip") t)
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57 (message "Compressing...done")
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58 (write-region (point-min)(point-max) fake-buffer-file-name)
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59 (bury-buffer (current-buffer))
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60 (set-buffer here)
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61 (set-buffer-modified-p nil)
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62 (setq found t)
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63 t)
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64 (setq exts (cdr exts))))
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65 found))
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66
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67
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68 (setq write-file-hooks (cons 'compress-again write-file-hooks))
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69