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1 | ;;; shadowfile.el -- automatic file copying for Emacs 19 |
2 | ||
3 | ;;; Author: Boris Goldowsky <boris@cs.rochester.edu> | |
4 | ;;; Keywords: comm | |
5 | ||
6 | ;;; Copyright (c) 1993 Free Software Foundation | |
7 | ;;; | |
8 | ;;; This program is free software; you can redistribute it and/or modify | |
9 | ;;; it under the terms of the GNU General Public License as published by | |
10 | ;;; the Free Software Foundation; either version 2, or (at your option) | |
11 | ;;; any later version. | |
12 | ;;; | |
13 | ;;; This program is distributed in the hope that it will be useful, | |
14 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | ;;; GNU General Public License for more details. | |
17 | ;;; | |
18 | ;;; A copy of the GNU General Public License can be obtained from this | |
19 | ;;; program's author or from the Free Software Foundation, Inc., 675 | |
20 | ;;; Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | ;;; LCD Archive Entry: | |
23 | ;;; shadowfile|Boris Goldowsky|boris@cs.rochester.edu| | |
24 | ;;; Helps you keep identical copies of files in multiple places.| | |
25 | ;;; $Date: 93/11/17 08:46:07 $ |$Revision: 2.8 $|~/misc/shadowfile.el.Z| | |
26 | ||
27 | ;;; Commentary: | |
28 | ;;; | |
29 | ;;; This package helps you to keep identical copies of files in more than one | |
30 | ;;; place - possibly on different machines. When you save a file, it checks | |
31 | ;;; whether it is on the list of files with "shadows", and if so, it tries to | |
32 | ;;; copy it when you exit emacs (or use the shadow-copy-files command). | |
33 | ||
34 | ;;; Installation & Use: | |
35 | ;;; | |
36 | ;;; Put (require 'shadowfile) in your .emacs; add clusters (if necessary) | |
37 | ;;; and file groups with shadow-define-cluster, shadow-define-literal-group, | |
38 | ;;; and shadow-define-regexp-group (see the documentation for these functions | |
39 | ;;; for information on how and when to use them). After doing this once, | |
40 | ;;; everything should be automatic. | |
41 | ;;; The lists of clusters and shadows are saved in a file called | |
42 | ;;; .shadows, so that they can be remembered from one emacs session to | |
43 | ;;; another, even (as much as possible) if the emacs session terminates | |
44 | ;;; abnormally. The files needing to be copied are stored in .shadow_todo; if | |
45 | ;;; a file cannot be copied for any reason, it will stay on the list to be | |
46 | ;;; tried again next time. The .shadows file should itself have shadows on | |
47 | ;;; all your accounts so that the information in it is consistent everywhere, | |
48 | ;;; but .shadow_todo is local information and should have no shadows. | |
49 | ;;; If you do not want to copy a particular file, you can answer "no" | |
50 | ;;; and be asked again next time you hit C-x 4 s or exit emacs. If you do not | |
51 | ;;; want to be asked again, use shadow-cancel, and you will not be asked until | |
52 | ;;; you change the file and save it again. If you do not want to shadow | |
53 | ;;; that file ever again, you can edit it out of the .shadows buffer. | |
54 | ;;; Anytime you edit the .shadows buffer, you must type M-x shadow-read-files | |
55 | ;;; to load in the new information, or your changes will be overwritten! | |
56 | ||
57 | ;;; Bugs & Warnings: | |
58 | ;;; | |
59 | ;;; - It is bad to have two emacses both running shadowfile at the same | |
60 | ;;; time. It tries to detect this condition, but is not always successful. | |
61 | ;;; | |
62 | ;;; - You have to be careful not to edit a file in two locations | |
63 | ;;; before shadowfile has had a chance to copy it; otherwise | |
64 | ;;; "updating shadows" will overwrite one of the changed versions. | |
65 | ;;; | |
66 | ;;; - It ought to check modification times of both files to make sure | |
67 | ;;; it is doing the right thing. This will have to wait until | |
68 | ;;; file-newer-than-file-p works between machines. | |
69 | ;;; | |
70 | ;;; - It will not make directories for you, it just fails to copy files | |
71 | ;;; that belong in non-existent directories. | |
72 | ;;; | |
73 | ;;; Please report any bugs to me (boris@cs.rochester.edu). Also let me know | |
74 | ;;; if you have suggestions or would like to be informed of updates. | |
75 | ||
76 | ;;; Code: | |
77 | ||
78 | (provide 'shadowfile) | |
79 | (require 'ange-ftp) | |
80 | ||
81 | (setq find-file-visit-truename t) ; makes life easier with symbolic links | |
82 | ||
83 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
84 | ;;; Variables | |
85 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
86 | ||
87 | (defvar shadow-noquery nil | |
88 | "*If nonnil, always copy shadow files without asking.") | |
89 | ||
90 | (defvar shadow-inhibit-message nil | |
91 | "*If nonnil, do not display a message when a file needs copying.") | |
92 | ||
93 | (defvar shadow-inhibit-overload nil | |
94 | "If nonnil, shadowfile won't redefine C-x C-c. | |
95 | Normally it overloads the function `save-buffers-kill-emacs' to check | |
96 | for files have been changed and need to be copied to other systems.") | |
97 | ||
98 | (defvar shadow-info-file nil | |
99 | "File to keep shadow information in. | |
100 | The shadow-info-file should be shadowed to all your accounts to | |
101 | ensure consistency. Default: ~/.shadows") | |
102 | ||
103 | (defvar shadow-todo-file nil | |
104 | "File to store the list of uncopied shadows in. | |
105 | This means that if a remote system is down, or for any reason you cannot or | |
106 | decide not to copy your shadow files at the end of one emacs session, it will | |
107 | remember and ask you again in your next emacs session. | |
108 | This file must NOT be shadowed to any other system, it is host-specific. | |
109 | Default: ~/.shadow_todo") | |
110 | ||
111 | ;;; The following two variables should in most cases initialize themselves | |
112 | ;;; correctly. They are provided as variables in case the defaults are wrong | |
113 | ;;; on your machine \(and for efficiency). | |
114 | ||
115 | (defvar shadow-system-name (system-name) | |
116 | "The complete hostname of this machine.") | |
117 | ||
118 | (defvar shadow-homedir nil | |
119 | "Your home directory on this machine.") | |
120 | ||
121 | ;;; | |
122 | ;;; Internal variables whose values are stored in the info and todo files: | |
123 | ;;; | |
124 | ||
125 | (defvar shadow-clusters nil | |
126 | "List of host clusters \(see shadow-define-cluster).") | |
127 | ||
128 | (defvar shadow-literal-groups nil | |
129 | "List of files that are shared between hosts. | |
130 | This list contains shadow structures with literal filenames, created by | |
131 | shadow-define-group.") | |
132 | ||
133 | (defvar shadow-regexp-groups nil | |
134 | "List of file types that are shared between hosts. | |
135 | This list contains shadow structures with regexps matching filenames, | |
136 | created by shadow-define-regexp-group.") | |
137 | ||
138 | ;;; | |
139 | ;;; Other internal variables: | |
140 | ;;; | |
141 | ||
142 | (defvar shadow-files-to-copy nil) ; List of files that need to | |
143 | ; be copied to remote hosts. | |
144 | ||
145 | (defvar shadow-hashtable nil) ; for speed | |
146 | ||
147 | (defvar shadow-info-buffer nil) ; buf visiting shadow-info-file | |
148 | (defvar shadow-todo-buffer nil) ; buf visiting shadow-todo-file | |
149 | ||
150 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
151 | ;;; Syntactic sugar; General list and string manipulation | |
152 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
153 | ||
154 | (defmacro shadow-when (condition &rest body) | |
155 | ;; From cl.el | |
156 | "(shadow-when CONDITION . BODY) => evaluate BODY if CONDITION is true." | |
157 | (` (if (not (, condition)) () (,@ body)))) | |
158 | ||
159 | (defun shadow-union (a b) | |
160 | "Add members of list A to list B | |
161 | if they are not equal to items already in B." | |
162 | (if (null a) | |
163 | b | |
164 | (if (member (car a) b) | |
165 | (shadow-union (cdr a) b) | |
166 | (shadow-union (cdr a) (cons (car a) b))))) | |
167 | ||
168 | (defun shadow-find (func list) | |
169 | "If FUNC applied to some element of LIST is nonnil, | |
170 | return the first such element." | |
171 | (while (and list (not (funcall func (car list)))) | |
172 | (setq list (cdr list))) | |
173 | (car list)) | |
174 | ||
175 | (defun shadow-remove-if (func list) | |
176 | "Remove elements satisfying FUNC from LIST. | |
177 | Nondestructive; actually returns a copy of the list with the elements removed." | |
178 | (if list | |
179 | (if (funcall func (car list)) | |
180 | (shadow-remove-if func (cdr list)) | |
181 | (cons (car list) (shadow-remove-if func (cdr list)))) | |
182 | nil)) | |
183 | ||
184 | (defun shadow-join (strings sep) | |
185 | "Concatenate elements of the list of STRINGS with SEP between each." | |
186 | (cond ((null strings) "") | |
187 | ((null (cdr strings)) (car strings)) | |
188 | ((concat (car strings) " " (shadow-join (cdr strings) sep))))) | |
189 | ||
190 | (defun shadow-regexp-superquote (string) | |
191 | "Like regexp-quote, but includes the ^ and $ | |
192 | to make sure regexp matches nothing but STRING." | |
193 | (concat "^" (regexp-quote string) "$")) | |
194 | ||
195 | (defun shadow-suffix (prefix string) | |
196 | "If PREFIX begins STRING, return the rest. | |
197 | Return value is nonnil if PREFIX and STRING are string= up to the length of | |
198 | PREFIX." | |
199 | (let ((lp (length prefix)) | |
200 | (ls (length string))) | |
201 | (if (and (>= ls lp) | |
202 | (string= prefix (substring string 0 lp))) | |
203 | (substring string lp)))) | |
204 | ||
205 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
206 | ;;; Clusters and sites | |
207 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
208 | ||
209 | ;;; I use the term `site' to refer to a string which may be the name of a | |
210 | ;;; cluster or a literal hostname. All user-level commands should accept | |
211 | ;;; either. | |
212 | ||
213 | (defun shadow-make-cluster (name primary regexp) | |
214 | "Creates a shadow cluster | |
215 | called NAME, using the PRIMARY hostname, REGEXP matching all hosts in the | |
216 | cluster. The variable shadow-clusters associates the names of clusters to | |
217 | these structures. | |
218 | This function is for program use: to create clusters interactively, use | |
219 | shadow-define-cluster instead." | |
220 | (list name primary regexp)) | |
221 | ||
222 | (defmacro shadow-cluster-name (cluster) | |
223 | "Return the name of the CLUSTER." | |
224 | (list 'elt cluster 0)) | |
225 | ||
226 | (defmacro shadow-cluster-primary (cluster) | |
227 | "Return the primary hostname of a CLUSTER." | |
228 | (list 'elt cluster 1)) | |
229 | ||
230 | (defmacro shadow-cluster-regexp (cluster) | |
231 | "Return the regexp matching hosts in a CLUSTER." | |
232 | (list 'elt cluster 2)) | |
233 | ||
234 | (defun shadow-set-cluster (name primary regexp) | |
235 | "Put cluster NAME on the list of clusters, | |
236 | replacing old definition if any. PRIMARY and REGEXP are the | |
237 | information defining the cluster. For interactive use, call | |
238 | shadow-define-cluster instead." | |
239 | (let ((rest (shadow-remove-if | |
240 | (function (lambda (x) (equal name (car x)))) | |
241 | shadow-clusters))) | |
242 | (setq shadow-clusters | |
243 | (cons (shadow-make-cluster name primary regexp) | |
244 | rest)))) | |
245 | ||
246 | (defmacro shadow-get-cluster (name) | |
247 | "Return cluster named NAME, or nil." | |
248 | (list 'assoc name 'shadow-clusters)) | |
249 | ||
250 | (defun shadow-site-primary (site) | |
251 | "If SITE is a cluster, return primary host, otherwise return SITE." | |
252 | (let ((c (shadow-get-cluster site))) | |
253 | (if c | |
254 | (shadow-cluster-primary c) | |
255 | site))) | |
256 | ||
257 | ;;; SITES | |
258 | ||
259 | (defun shadow-site-cluster (site) | |
260 | "Given a SITE \(hostname or cluster name), return the cluster | |
261 | that it is in, or nil." | |
262 | (or (assoc site shadow-clusters) | |
263 | (shadow-find | |
264 | (function (lambda (x) | |
265 | (string-match (shadow-cluster-regexp x) | |
266 | site))) | |
267 | shadow-clusters))) | |
268 | ||
269 | (defun shadow-read-site () | |
270 | "Read a cluster name or hostname from the minibuffer." | |
271 | (let ((ans (completing-read "Host or cluster name [RET when done]: " | |
272 | shadow-clusters))) | |
273 | (if (equal "" ans) | |
274 | nil | |
275 | ans))) | |
276 | ||
277 | (defun shadow-site-match (site1 site2) | |
278 | "Nonnil iff SITE1 is or includes SITE2. | |
279 | Each may be a host or cluster name; if they are clusters, regexp of site1 will | |
280 | be matched against the primary of site2." | |
281 | (or (string-equal site1 site2) ; quick check | |
282 | (let* ((cluster1 (shadow-get-cluster site1)) | |
283 | (primary2 (shadow-site-primary site2))) | |
284 | (if cluster1 | |
285 | (string-match (shadow-cluster-regexp cluster1) primary2) | |
286 | (string-equal site1 primary2))))) | |
287 | ||
288 | (defun shadow-get-user (site) | |
289 | "Returns the default username for a site." | |
290 | (ange-ftp-get-user (shadow-site-primary site))) | |
291 | ||
292 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
293 | ;;; Filename manipulation | |
294 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
295 | ||
296 | (defun shadow-parse-fullpath (fullpath) | |
297 | "Parse PATH into \(site user path) list, | |
298 | or leave it alone if it already is one. Returns nil if the argument is not a | |
299 | full ange-ftp pathname." | |
300 | (if (listp fullpath) | |
301 | fullpath | |
302 | (ange-ftp-ftp-name fullpath))) | |
303 | ||
304 | (defun shadow-parse-path (path) | |
305 | "Parse any PATH into \(site user path) list. | |
306 | Argument can be a simple path, full ange-ftp path, or already a hup list." | |
307 | (or (shadow-parse-fullpath path) | |
308 | (list shadow-system-name | |
309 | (user-login-name) | |
310 | path))) | |
311 | ||
312 | (defsubst shadow-make-fullpath (host user path) | |
313 | "Make an ange-ftp style fullpath out of HOST, USER (optional), and PATH. | |
314 | This is probably not as general as it ought to be." | |
315 | (concat "/" | |
316 | (if user (concat user "@")) | |
317 | host ":" | |
318 | path)) | |
319 | ||
320 | (defun shadow-replace-path-component (fullpath newpath) | |
321 | "Return FULLPATH with the pathname component changed to NEWPATH." | |
322 | (let ((hup (shadow-parse-fullpath fullpath))) | |
323 | (shadow-make-fullpath (nth 0 hup) (nth 1 hup) newpath))) | |
324 | ||
325 | (defun shadow-local-file (file) | |
326 | "If FILENAME is at this site, | |
327 | remove /user@host part. If refers to a different system or a different user on | |
328 | this system, return nil." | |
329 | (let ((hup (shadow-parse-fullpath file))) | |
330 | (cond ((null hup) file) | |
331 | ((and (shadow-site-match (nth 0 hup) shadow-system-name) | |
332 | (string-equal (nth 1 hup) (user-login-name))) | |
333 | (nth 2 hup)) | |
334 | (t nil)))) | |
335 | ||
336 | (defun shadow-expand-cluster-in-file-name (file) | |
337 | "If hostname part of FILE is a cluster, expand it | |
338 | into the cluster's primary hostname. Will return the pathname bare if it is | |
339 | a local file." | |
340 | (let ((hup (shadow-parse-path file)) | |
341 | cluster) | |
342 | (cond ((null hup) file) | |
343 | ((shadow-local-file hup)) | |
344 | ((shadow-make-fullpath (shadow-site-primary (nth 0 hup)) | |
345 | (nth 1 hup) | |
346 | (nth 2 hup)))))) | |
347 | ||
348 | (defun shadow-expand-file-name (file &optional default) | |
349 | "Expand file name and get file's true name." | |
350 | (file-truename (expand-file-name file default))) | |
351 | ||
352 | (defun shadow-contract-file-name (file) | |
353 | "Simplify FILENAME | |
354 | by replacing (when possible) home directory with ~, and hostname with cluster | |
355 | name that includes it. Filename should be absolute and true." | |
356 | (let* ((hup (shadow-parse-path file)) | |
357 | (homedir (if (shadow-local-file hup) | |
358 | shadow-homedir | |
359 | (file-name-as-directory | |
360 | (nth 2 (shadow-parse-fullpath | |
361 | (expand-file-name | |
362 | (shadow-make-fullpath | |
363 | (nth 0 hup) (nth 1 hup) "~"))))))) | |
364 | (suffix (shadow-suffix homedir (nth 2 hup))) | |
365 | (cluster (shadow-site-cluster (nth 0 hup)))) | |
366 | (shadow-make-fullpath | |
367 | (if cluster | |
368 | (shadow-cluster-name cluster) | |
369 | (nth 0 hup)) | |
370 | (nth 1 hup) | |
371 | (if suffix | |
372 | (concat "~/" suffix) | |
373 | (nth 2 hup))))) | |
374 | ||
375 | (defun shadow-same-site (pattern file) | |
376 | "True if the site of PATTERN and of FILE are on the same site. | |
377 | If usernames are supplied, they must also match exactly. PATTERN and FILE may | |
378 | be lists of host, user, path, or ange-ftp pathnames. FILE may also be just a | |
379 | local filename." | |
380 | (let ((pattern-sup (shadow-parse-fullpath pattern)) | |
381 | (file-sup (shadow-parse-path file))) | |
382 | (and | |
383 | (shadow-site-match (nth 0 pattern-sup) (nth 0 file-sup)) | |
384 | (or (null (nth 1 pattern-sup)) | |
385 | (string-equal (nth 1 pattern-sup) (nth 1 file-sup)))))) | |
386 | ||
387 | (defun shadow-file-match (pattern file &optional regexp) | |
388 | "Returns t if PATTERN matches FILE. | |
389 | If REGEXP is supplied and nonnil, the pathname part of the pattern is a regular | |
390 | expression, otherwise it must match exactly. The sites and usernames must | |
391 | match---see shadow-same-site. The pattern must be in full ange-ftp format, but | |
392 | the file can be any valid filename. This function does not do any filename | |
393 | expansion or contraction, you must do that yourself first." | |
394 | (let* ((pattern-sup (shadow-parse-fullpath pattern)) | |
395 | (file-sup (shadow-parse-path file))) | |
396 | (and (shadow-same-site pattern-sup file-sup) | |
397 | (if regexp | |
398 | (string-match (nth 2 pattern-sup) (nth 2 file-sup)) | |
399 | (string-equal (nth 2 pattern-sup) (nth 2 file-sup)))))) | |
400 | ||
401 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
402 | ;;; User-level Commands | |
403 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
404 | ||
405 | (defun shadow-define-cluster (name) | |
406 | "Edit \(or create) the definition of a cluster. | |
407 | This is a group of hosts that share directories, so that copying to or from | |
408 | one of them is sufficient to update the file on all of them. Clusters are | |
409 | defined by a name, the network address of a primary host \(the one we copy | |
410 | files to), and a regular expression that matches the hostnames of all the sites | |
411 | in the cluster." | |
412 | (interactive (list (completing-read "Cluster name: " shadow-clusters () ()))) | |
413 | (let* ((old (shadow-get-cluster name)) | |
414 | (primary (read-string "Primary host: " | |
415 | (if old (shadow-cluster-primary old) | |
416 | name))) | |
417 | (regexp (let (try-regexp) | |
418 | (while (not | |
419 | (string-match | |
420 | (setq try-regexp | |
421 | (read-string | |
422 | "Regexp matching all host names: " | |
423 | (if old (shadow-cluster-regexp old) | |
424 | (shadow-regexp-superquote primary)))) | |
425 | primary)) | |
426 | (message "Regexp doesn't include the primary host!") | |
427 | (sit-for 2)) | |
428 | try-regexp)) | |
429 | ; (username (read-no-blanks-input | |
430 | ; (format "Username [default: %s]: " | |
431 | ; (shadow-get-user primary)) | |
432 | ; (if old (or (shadow-cluster-username old) "") | |
433 | ; (user-login-name)))) | |
434 | ) | |
435 | ; (if (string-equal "" username) (setq username nil)) | |
436 | (shadow-set-cluster name primary regexp))) | |
437 | ||
438 | (defun shadow-define-literal-group () | |
439 | "Declare a single file to be shared between sites. | |
440 | It may have different filenames on each site. When this file is edited, the | |
441 | new version will be copied to each of the other locations. Sites can be | |
442 | specific hostnames, or names of clusters \(see shadow-define-cluster)." | |
443 | (interactive) | |
444 | (let* ((hup (shadow-parse-fullpath | |
445 | (shadow-contract-file-name (buffer-file-name)))) | |
446 | (path (nth 2 hup)) | |
447 | user site group) | |
448 | (while (setq site (shadow-read-site)) | |
449 | (setq user (read-string (format "Username [default %s]: " | |
450 | (shadow-get-user site))) | |
451 | path (read-string "Filename: " path)) | |
452 | (setq group (cons (shadow-make-fullpath site | |
453 | (if (string-equal "" user) | |
454 | (shadow-get-user site) | |
455 | user) | |
456 | path) | |
457 | group))) | |
458 | (setq shadow-literal-groups (cons group shadow-literal-groups))) | |
459 | (shadow-write-info-file)) | |
460 | ||
461 | (defun shadow-define-regexp-group () | |
462 | "Make each of a group of files be shared between hosts. | |
463 | Prompts for regular expression; files matching this are shared between a list | |
464 | of sites, which are also prompted for. The filenames must be identical on all | |
465 | hosts \(if they aren't, use shadow-define-group instead of this function). | |
466 | Each site can be either a hostname or the name of a cluster \(see | |
467 | shadow-define-cluster)." | |
468 | (interactive) | |
469 | (let ((regexp (read-string | |
470 | "Filename regexp: " | |
471 | (if (buffer-file-name) | |
472 | (shadow-regexp-superquote | |
473 | (nth 2 | |
474 | (shadow-parse-path | |
475 | (shadow-contract-file-name | |
476 | (buffer-file-name)))))))) | |
477 | site sites usernames) | |
478 | (while (setq site (shadow-read-site)) | |
479 | (setq sites (cons site sites)) | |
480 | (setq usernames | |
481 | (cons (read-string (format "Username for %s: " site) | |
482 | (shadow-get-user site)) | |
483 | usernames))) | |
484 | (setq shadow-regexp-groups | |
485 | (cons (shadow-make-group regexp sites usernames) | |
486 | shadow-regexp-groups)) | |
487 | (shadow-write-info-file))) | |
488 | ||
489 | (defun shadow-shadows () | |
490 | ;; Mostly for debugging. | |
491 | "Interactive function to display shadows of a buffer." | |
492 | (interactive) | |
493 | (let ((msg (shadow-join (mapcar (function cdr) | |
494 | (shadow-shadows-of (buffer-file-name))) | |
495 | " "))) | |
496 | (message (if (zerop (length msg)) | |
497 | "No shadows." | |
498 | msg)))) | |
499 | ||
500 | (defun shadow-copy-files (&optional arg) | |
501 | "Copy all pending shadow files. | |
502 | With prefix argument, copy all pending files without query. | |
503 | Pending copies are stored in variable shadow-files-to-copy, and in | |
504 | shadow-todo-file if necessary. This function is invoked by | |
505 | shadow-save-buffers-kill-emacs, so it is not usually necessary to | |
506 | call it manually." | |
507 | (interactive "P") | |
508 | (if (and (not shadow-files-to-copy) (interactive-p)) | |
509 | (message "No files need to be shadowed.") | |
510 | (save-excursion | |
511 | (map-y-or-n-p (function | |
512 | (lambda (pair) | |
513 | (or arg | |
514 | (format "Copy shadow file %s? " (cdr pair))))) | |
515 | (function shadow-copy-file) | |
516 | shadow-files-to-copy | |
517 | '("shadow" "shadows" "copy")) | |
518 | (shadow-write-todo-file t)))) | |
519 | ||
520 | (defun shadow-cancel () | |
521 | "Cancel the instruction to copy some files. | |
522 | Prompts for which copy operations to cancel. You will not be asked to copy | |
523 | them again, unless you make more changes to the files. To cancel a shadow | |
524 | permanently, remove the group from shadow-literal-groups or | |
525 | shadow-regexp-groups." | |
526 | (interactive) | |
527 | (map-y-or-n-p (function (lambda (pair) | |
528 | (format "Cancel copying %s to %s? " | |
529 | (car pair) (cdr pair)))) | |
530 | (function (lambda (pair) | |
531 | (shadow-remove-from-todo pair))) | |
532 | shadow-files-to-copy | |
533 | '("shadow" "shadows" "cancel copy")) | |
534 | (message (format "There are %d shadows to be updated." | |
535 | (length shadow-files-to-copy))) | |
536 | (shadow-write-todo-file)) | |
537 | ||
538 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
539 | ;;; Internal functions | |
540 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
541 | ||
542 | (defun shadow-make-group (regexp sites usernames) | |
543 | "Makes a description of a file group--- | |
544 | actually a list of regexp ange-ftp file names---from REGEXP \(name of file to | |
545 | be shadowed), list of SITES, and corresponding list of USERNAMES for each | |
546 | site." | |
547 | (if sites | |
548 | (cons (shadow-make-fullpath (car sites) (car usernames) regexp) | |
549 | (shadow-make-group regexp (cdr sites) (cdr usernames))) | |
550 | nil)) | |
551 | ||
552 | (defun shadow-copy-file (s) | |
553 | "Copy one shadow file." | |
554 | (let* ((buffer | |
555 | (cond ((get-file-buffer (car s))) | |
556 | ((not (file-readable-p (car s))) | |
557 | (if (y-or-n-p | |
558 | (format "Cannot find file %s--cancel copy request?" | |
559 | (car s))) | |
560 | (shadow-remove-from-todo s)) | |
561 | nil) | |
562 | ((y-or-n-p | |
563 | (format "No buffer for %s -- update shadow anyway?" | |
564 | (car s))) | |
565 | (find-file-noselect (car s))))) | |
566 | (to (shadow-expand-cluster-in-file-name (cdr s)))) | |
567 | (shadow-when buffer | |
568 | (set-buffer buffer) | |
569 | (save-restriction | |
570 | (widen) | |
571 | (condition-case i | |
572 | (progn | |
573 | (write-region (point-min) (point-max) to) | |
574 | (shadow-remove-from-todo s)) | |
575 | (error (message (format "Shadow %s not updated!" | |
576 | (cdr s))))))))) | |
577 | ||
578 | (defun shadow-shadows-of (file) | |
579 | "Returns copy operations needed to update FILE. | |
580 | Filename should have clusters expanded, but otherwise can have any format. | |
581 | Return value is a list of dotted pairs like \(from . to), where from | |
582 | and to are absolute file names." | |
583 | (or (symbol-value (intern-soft file shadow-hashtable)) | |
584 | (let* ((absolute-file (shadow-expand-file-name | |
585 | (or (shadow-local-file file) file) | |
586 | shadow-homedir)) | |
587 | (canonical-file (shadow-contract-file-name absolute-file)) | |
588 | (shadows | |
589 | (mapcar (function (lambda (shadow) | |
590 | (cons absolute-file shadow))) | |
591 | (append | |
592 | (shadow-shadows-of-1 | |
593 | canonical-file shadow-literal-groups nil) | |
594 | (shadow-shadows-of-1 | |
595 | canonical-file shadow-regexp-groups t))))) | |
596 | (set (intern file shadow-hashtable) shadows)))) | |
597 | ||
598 | (defun shadow-shadows-of-1 (file groups regexp) | |
599 | "Return list of FILE's shadows in GROUPS, | |
600 | which are considered as regular expressions if third arg REGEXP is true." | |
601 | (if groups | |
602 | (let ((nonmatching | |
603 | (shadow-remove-if | |
604 | (function (lambda (x) (shadow-file-match x file regexp))) | |
605 | (car groups)))) | |
606 | (append (cond ((equal nonmatching (car groups)) nil) | |
607 | (regexp | |
608 | (let ((realpath (nth 2 (shadow-parse-fullpath file)))) | |
609 | (mapcar | |
610 | (function | |
611 | (lambda (x) | |
612 | (shadow-replace-path-component x realpath))) | |
613 | nonmatching))) | |
614 | (t nonmatching)) | |
615 | (shadow-shadows-of-1 file (cdr groups) regexp))))) | |
616 | ||
617 | (defun shadow-add-to-todo () | |
618 | "If current buffer has shadows, add them to the list | |
619 | of files needing to be copied." | |
620 | (let ((shadows (shadow-shadows-of | |
621 | (shadow-expand-file-name | |
622 | (buffer-file-name (current-buffer)))))) | |
623 | (shadow-when shadows | |
624 | (setq shadow-files-to-copy | |
625 | (shadow-union shadows shadow-files-to-copy)) | |
626 | (shadow-when (not shadow-inhibit-message) | |
627 | (message (substitute-command-keys | |
628 | "Use \\[shadow-copy-files] to update shadows.")) | |
629 | (sit-for 1)) | |
630 | (shadow-write-todo-file))) | |
631 | nil) ; Return nil for write-file-hooks | |
632 | ||
633 | (defun shadow-remove-from-todo (pair) | |
634 | "Remove PAIR from shadow-files-to-copy. | |
635 | PAIR must be (eq to) one of the elements of that list." | |
636 | (setq shadow-files-to-copy | |
637 | (shadow-remove-if (function (lambda (s) (eq s pair))) | |
638 | shadow-files-to-copy))) | |
639 | ||
640 | (defun shadow-read-files () | |
641 | "Visits and loads shadow-info-file and shadow-todo-file, | |
642 | thus restoring shadowfile's state from your last emacs session. | |
643 | Returns t unless files were locked; then returns nil." | |
644 | (interactive) | |
645 | (if (or (stringp (file-locked-p shadow-info-file)) | |
646 | (stringp (file-locked-p shadow-todo-file))) | |
647 | (progn | |
648 | (message "Shadowfile is running in another emacs; can't have two.") | |
649 | (beep) | |
650 | (sit-for 3) | |
651 | nil) | |
652 | (save-excursion | |
653 | (shadow-when shadow-info-file | |
654 | (set-buffer (setq shadow-info-buffer | |
655 | (find-file-noselect shadow-info-file))) | |
656 | (shadow-when (and (not (buffer-modified-p)) | |
657 | (file-newer-than-file-p (make-auto-save-file-name) | |
658 | shadow-info-file)) | |
659 | (erase-buffer) | |
660 | (message "Data recovered from %s." | |
661 | (car (insert-file-contents (make-auto-save-file-name)))) | |
662 | (sit-for 1)) | |
663 | (eval-current-buffer)) | |
664 | (shadow-when shadow-todo-file | |
665 | (set-buffer (setq shadow-todo-buffer | |
666 | (find-file-noselect shadow-todo-file))) | |
667 | (shadow-when (and (not (buffer-modified-p)) | |
668 | (file-newer-than-file-p (make-auto-save-file-name) | |
669 | shadow-todo-file)) | |
670 | (erase-buffer) | |
671 | (message "Data recovered from %s." | |
672 | (car (insert-file-contents (make-auto-save-file-name)))) | |
673 | (sit-for 1)) | |
674 | (eval-current-buffer nil)) | |
675 | (shadow-invalidate-hashtable)) | |
676 | t)) | |
677 | ||
678 | (defun shadow-write-info-file () | |
679 | "Write out information to shadow-info-file. | |
680 | Also clears shadow-hashtable, since when there are new shadows defined, the old | |
681 | hashtable info is invalid." | |
682 | (shadow-invalidate-hashtable) | |
683 | (if shadow-info-file | |
684 | (save-excursion | |
685 | (if (not shadow-info-buffer) | |
686 | (setq shadow-info-buffer (find-file-noselect shadow-info-file))) | |
687 | (set-buffer shadow-info-buffer) | |
688 | (delete-region (point-min) (point-max)) | |
689 | (shadow-insert-var 'shadow-clusters) | |
690 | (shadow-insert-var 'shadow-literal-groups) | |
691 | (shadow-insert-var 'shadow-regexp-groups)))) | |
692 | ||
693 | (defun shadow-write-todo-file (&optional save) | |
694 | "Write out information to shadow-todo-file. | |
695 | With nonnil argument also saves the buffer." | |
696 | (save-excursion | |
697 | (if (not shadow-todo-buffer) | |
698 | (setq shadow-todo-buffer (find-file-noselect shadow-todo-file))) | |
699 | (set-buffer shadow-todo-buffer) | |
700 | (delete-region (point-min) (point-max)) | |
701 | (shadow-insert-var 'shadow-files-to-copy) | |
702 | (if save (shadow-save-todo-file)))) | |
703 | ||
704 | (defun shadow-save-todo-file () | |
705 | (if (and shadow-todo-buffer (buffer-modified-p shadow-todo-buffer)) | |
706 | (save-excursion | |
707 | (set-buffer shadow-todo-buffer) | |
708 | (condition-case nil ; have to continue even in case of | |
709 | (basic-save-buffer) ; error, otherwise kill-emacs might | |
710 | (error ; not work! | |
711 | (message "WARNING: Can't save shadow todo file; it is locked!") | |
712 | (sit-for 1)))))) | |
713 | ||
714 | (defun shadow-invalidate-hashtable () | |
715 | (setq shadow-hashtable (make-vector 37 0))) | |
716 | ||
717 | (defun shadow-insert-var (variable) | |
718 | "Prettily insert a setq command for VARIABLE. | |
719 | which, when later evaluated, will restore it to its current setting. | |
720 | SYMBOL must be the name of a variable whose value is a list." | |
721 | (let ((standard-output (current-buffer))) | |
722 | (insert (format "(setq %s" variable)) | |
723 | (cond ((consp (eval variable)) | |
724 | (insert "\n '(") | |
725 | (prin1 (car (eval variable))) | |
726 | (let ((rest (cdr (eval variable)))) | |
727 | (while rest | |
728 | (insert "\n ") | |
729 | (prin1 (car rest)) | |
730 | (setq rest (cdr rest))) | |
731 | (insert "))\n\n"))) | |
732 | (t (insert " ") | |
733 | (prin1 (eval variable)) | |
734 | (insert ")\n\n"))))) | |
735 | ||
736 | (defun shadow-save-buffers-kill-emacs (&optional arg) | |
737 | "Offer to save each buffer and copy shadows, then kill this Emacs process. | |
738 | With prefix arg, silently save all file-visiting buffers, then kill. | |
739 | ||
740 | Extended by shadowfile to automatically save `shadow-todo-file' and | |
741 | look for files that have been changed and need to be copied to other systems." | |
742 | ;; This function is necessary because we need to get control and save | |
743 | ;; the todo file /after/ saving other files, but /before/ the warning | |
744 | ;; message about unsaved buffers (because it can get modified by the | |
745 | ;; action of saving other buffers). `kill-emacs-hook' is no good | |
746 | ;; because it is not called at the correct time, and also because it is | |
747 | ;; called when the terminal is disconnected and we cannot ask whether | |
748 | ;; to copy files. | |
749 | (interactive "P") | |
750 | (shadow-save-todo-file) | |
751 | (save-some-buffers arg t) | |
752 | (shadow-copy-files) | |
753 | (shadow-save-todo-file) | |
754 | (and (or (not (memq t (mapcar (function | |
755 | (lambda (buf) (and (buffer-file-name buf) | |
756 | (buffer-modified-p buf)))) | |
757 | (buffer-list)))) | |
758 | (yes-or-no-p "Modified buffers exist; exit anyway? ")) | |
759 | (or (not (fboundp 'process-list)) | |
760 | ;; process-list is not defined on VMS. | |
761 | (let ((processes (process-list)) | |
762 | active) | |
763 | (while processes | |
764 | (and (memq (process-status (car processes)) '(run stop open)) | |
765 | (let ((val (process-kill-without-query (car processes)))) | |
766 | (process-kill-without-query (car processes) val) | |
767 | val) | |
768 | (setq active t)) | |
769 | (setq processes (cdr processes))) | |
770 | (or (not active) | |
771 | (yes-or-no-p "Active processes exist; kill them and exit anyway? ")))) | |
772 | (kill-emacs))) | |
773 | ||
774 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
775 | ;;; Lucid Emacs compatibility (may not be complete) | |
776 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
777 | ||
778 | (shadow-when (not (fboundp 'file-truename)) | |
779 | (require 'symlink-fix) | |
780 | (defun shadow-expand-file-name (file &optional default) | |
781 | (symlink-expand-file-name file default))) | |
782 | ||
783 | (shadow-when (not (fboundp 'ange-ftp-ftp-name)) | |
784 | (require 'ange-ftp) | |
785 | (defun shadow-parse-fullpath (fullpath) | |
786 | (if (listp fullpath) | |
787 | fullpath | |
788 | (ange-ftp-ftp-path fullpath)))) | |
789 | ||
790 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
791 | ;;; Hook us up | |
792 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
793 | ||
794 | ;;; File shadowing is activated at load time, unless this this file is | |
795 | ;;; being preloaded, in which case it is added to after-init-hook. | |
796 | ;;; Thanks to Richard Caley for this scheme. | |
797 | ||
798 | (defun shadow-initialize () | |
799 | (if (null shadow-homedir) | |
800 | (setq shadow-homedir | |
801 | (file-name-as-directory (shadow-expand-file-name "~")))) | |
802 | (if (null shadow-info-file) | |
803 | (setq shadow-info-file | |
804 | (shadow-expand-file-name "~/.shadows"))) | |
805 | (if (null shadow-todo-file) | |
806 | (setq shadow-todo-file | |
807 | (shadow-expand-file-name "~/.shadow_todo"))) | |
808 | (if (not (shadow-read-files)) | |
809 | (progn | |
810 | (message "Shadowfile information files not found - aborting") | |
811 | (beep) | |
812 | (sit-for 3)) | |
813 | (shadow-when (and (not shadow-inhibit-overload) | |
814 | (not (fboundp 'shadow-orig-save-buffers-kill-emacs))) | |
815 | (fset 'shadow-orig-save-buffers-kill-emacs | |
816 | (symbol-function 'save-buffers-kill-emacs)) | |
817 | (fset 'save-buffers-kill-emacs | |
818 | (symbol-function 'shadow-save-buffers-kill-emacs))) | |
819 | (add-hook 'write-file-hooks 'shadow-add-to-todo) | |
820 | (define-key ctl-x-4-map "s" 'shadow-copy-files))) | |
821 | ||
822 | (if noninteractive | |
823 | (add-hook 'after-init-hook 'shadow-initialize) | |
824 | (shadow-initialize)) | |
825 | ||
826 | ;;;Local Variables: | |
827 | ;;;eval:(put 'shadow-when 'lisp-indent-hook 1) | |
828 | ;;;End: | |
829 | ||
830 | ;;; shadowfile.el ends here |