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60370d40 | 1 | ;;; em-dirs.el --- directory navigation commands |
affbf647 | 2 | |
faadfb0a | 3 | ;; Copyright (C) 1999, 2000 Free Software Foundation |
affbf647 | 4 | |
7de5b421 GM |
5 | ;; Author: John Wiegley <johnw@gnu.org> |
6 | ||
affbf647 GM |
7 | ;; This file is part of GNU Emacs. |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
11 | ;; the Free Software Foundation; either version 2, or (at your option) | |
12 | ;; any later version. | |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
21 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | ;; Boston, MA 02111-1307, USA. | |
23 | ||
24 | (provide 'em-dirs) | |
25 | ||
26 | (eval-when-compile (require 'esh-maint)) | |
27 | ||
28 | (defgroup eshell-dirs nil | |
29 | "Directory navigation involves changing directories, examining the | |
30 | current directory, maintaining a directory stack, and also keeping | |
31 | track of a history of the last directory locations the user was in. | |
32 | Emacs does provide standard Lisp definitions of `pwd' and `cd', but | |
33 | they lack somewhat in feel from the typical shell equivalents." | |
34 | :tag "Directory navigation" | |
35 | :group 'eshell-module) | |
36 | ||
37 | ;;; Commentary: | |
38 | ||
39 | ;; The only special feature that Eshell offers in the last-dir-ring. | |
40 | ;; To view the ring, enter: | |
41 | ;; | |
42 | ;; cd = | |
43 | ;; | |
44 | ;; Changing to an index within the ring is done using: | |
45 | ;; | |
46 | ;; cd - ; same as cd -0 | |
47 | ;; cd -4 | |
48 | ;; | |
49 | ;; Or, it is possible to change the first member in the ring which | |
50 | ;; matches a regexp: | |
51 | ;; | |
52 | ;; cd =bcc ; change to the last directory visited containing "bcc" | |
53 | ;; | |
54 | ;; This ring is maintained automatically, and is persisted across | |
55 | ;; Eshell sessions. It is a separate mechanism from `pushd' and | |
56 | ;; `popd', and the two may be used at the same time. | |
57 | ||
58 | (require 'ring) | |
59 | (require 'esh-opt) | |
60 | ||
61 | ;;; User Variables: | |
62 | ||
63 | (defcustom eshell-dirs-load-hook '(eshell-dirs-initialize) | |
64 | "*A hook that gets run when `eshell-dirs' is loaded." | |
65 | :type 'hook | |
66 | :group 'eshell-dirs) | |
67 | ||
68 | (defcustom eshell-pwd-convert-function (if (eshell-under-windows-p) | |
69 | 'expand-file-name | |
70 | 'identity) | |
71 | "*The function used to normalize the value of Eshell's `pwd'. | |
72 | The value returned by `pwd' is also used when recording the | |
73 | last-visited directory in the last-dir-ring, so it will affect the | |
74 | form of the list used by 'cd ='." | |
75 | :type '(radio (function-item file-truename) | |
76 | (function-item expand-file-name) | |
77 | (function-item identity) | |
78 | (function :tag "Other")) | |
79 | :group 'eshell-dirs) | |
80 | ||
81 | (defcustom eshell-ask-to-save-last-dir 'always | |
82 | "*Determine if the last-dir-ring should be automatically saved. | |
83 | The last-dir-ring is always preserved when exiting an Eshell buffer. | |
84 | However, when Emacs is being shut down, this variable determines | |
85 | whether to prompt the user, or just save the ring. | |
86 | If set to nil, it means never ask whether to save the last-dir-ring. | |
87 | If set to t, always ask if any Eshell buffers are open at exit time. | |
88 | If set to `always', the list-dir-ring will always be saved, silently." | |
89 | :type '(choice (const :tag "Never" nil) | |
90 | (const :tag "Ask" t) | |
91 | (const :tag "Always save" always)) | |
92 | :group 'eshell-dirs) | |
93 | ||
94 | (defcustom eshell-cd-shows-directory nil | |
95 | "*If non-nil, using `cd' will report the directory it changes to." | |
96 | :type 'boolean | |
97 | :group 'eshell-dirs) | |
98 | ||
99 | (defcustom eshell-cd-on-directory t | |
100 | "*If non-nil, do a cd if a directory is in command position." | |
101 | :type 'boolean | |
102 | :group 'eshell-dirs) | |
103 | ||
104 | (defcustom eshell-directory-change-hook nil | |
105 | "*A hook to run when the current directory changes." | |
106 | :type 'hook | |
107 | :group 'eshell-dirs) | |
108 | ||
109 | (defcustom eshell-list-files-after-cd nil | |
110 | "*If non-nil, call \"ls\" with any remaining args after doing a cd. | |
111 | This is provided for convenience, since the same effect is easily | |
112 | achieved by adding a function to `eshell-directory-change-hook' that | |
113 | calls \"ls\" and references `eshell-last-arguments'." | |
114 | :type 'boolean | |
115 | :group 'eshell-dirs) | |
116 | ||
117 | (defcustom eshell-pushd-tohome nil | |
118 | "*If non-nil, make pushd with no arg behave as 'pushd ~' (like `cd'). | |
119 | This mirrors the optional behavior of tcsh." | |
120 | :type 'boolean | |
121 | :group 'eshell-dirs) | |
122 | ||
123 | (defcustom eshell-pushd-dextract nil | |
124 | "*If non-nil, make \"pushd +n\" pop the nth dir to the stack top. | |
125 | This mirrors the optional behavior of tcsh." | |
126 | :type 'boolean | |
127 | :group 'eshell-dirs) | |
128 | ||
129 | (defcustom eshell-pushd-dunique nil | |
130 | "*If non-nil, make pushd only add unique directories to the stack. | |
131 | This mirrors the optional behavior of tcsh." | |
132 | :type 'boolean | |
133 | :group 'eshell-dirs) | |
134 | ||
135 | (defcustom eshell-dirtrack-verbose t | |
136 | "*If non-nil, show the directory stack following directory change. | |
137 | This is effective only if directory tracking is enabled." | |
138 | :type 'boolean | |
139 | :group 'eshell-dirs) | |
140 | ||
141 | (defcustom eshell-last-dir-ring-file-name | |
142 | (concat eshell-directory-name "lastdir") | |
143 | "*If non-nil, name of the file to read/write the last-dir-ring. | |
144 | See also `eshell-read-last-dir-ring' and `eshell-write-last-dir-ring'. | |
145 | If it is nil, the last-dir-ring will not be written to disk." | |
146 | :type 'file | |
147 | :group 'eshell-dirs) | |
148 | ||
149 | (defcustom eshell-last-dir-ring-size 32 | |
150 | "*If non-nil, the size of the directory history ring. | |
151 | This ring is added to every time `cd' or `pushd' is used. It simply | |
152 | stores the most recent directory locations Eshell has been in. To | |
153 | return to the most recent entry, use 'cd -' (equivalent to 'cd -0'). | |
154 | To return to an older entry, use 'cd -N', where N is an integer less | |
155 | than `eshell-last-dir-ring-size'. To return to the last directory | |
156 | matching a particular regexp, use 'cd =REGEXP'. To display the | |
157 | directory history list, use 'cd ='. | |
158 | ||
159 | This mechanism is very similar to that provided by `pushd', except | |
160 | it's far more automatic. `pushd' allows the user to decide which | |
161 | directories gets pushed, and its size is unlimited. | |
162 | ||
163 | `eshell-last-dir-ring' is meant for users who don't use `pushd' | |
164 | explicity very much, but every once in a while would like to return to | |
165 | a previously visited directory without having to type in the whole | |
166 | thing again." | |
167 | :type 'integer | |
168 | :group 'eshell-dirs) | |
169 | ||
170 | (defcustom eshell-last-dir-unique t | |
171 | "*If non-nil, `eshell-last-dir-ring' contains only unique entries." | |
172 | :type 'boolean | |
173 | :group 'eshell-dirs) | |
174 | ||
560ca4be | 175 | ;;; Internal Variables: |
affbf647 GM |
176 | |
177 | (defvar eshell-dirstack nil | |
178 | "List of directories saved by pushd in the Eshell buffer. | |
179 | Thus, this does not include the current directory.") | |
180 | ||
181 | (defvar eshell-last-dir-ring nil | |
182 | "The last directory that eshell was in.") | |
183 | ||
184 | ;;; Functions: | |
185 | ||
186 | (defun eshell-dirs-initialize () | |
187 | "Initialize the builtin functions for Eshell." | |
188 | (make-local-variable 'eshell-variable-aliases-list) | |
189 | (setq eshell-variable-aliases-list | |
190 | (append | |
191 | eshell-variable-aliases-list | |
192 | '(("-" (lambda (indices) | |
193 | (if (not indices) | |
194 | (unless (ring-empty-p eshell-last-dir-ring) | |
195 | (expand-file-name | |
196 | (ring-ref eshell-last-dir-ring 0))) | |
197 | (expand-file-name | |
198 | (eshell-apply-indices eshell-last-dir-ring indices))))) | |
199 | ("+" "PWD") | |
200 | ("PWD" (lambda (indices) | |
201 | (expand-file-name (eshell/pwd))) t) | |
202 | ("OLDPWD" (lambda (indices) | |
203 | (unless (ring-empty-p eshell-last-dir-ring) | |
204 | (expand-file-name | |
205 | (ring-ref eshell-last-dir-ring 0)))) t)))) | |
206 | ||
207 | (when eshell-cd-on-directory | |
208 | (make-local-variable 'eshell-interpreter-alist) | |
209 | (setq eshell-interpreter-alist | |
210 | (cons (cons 'eshell-lone-directory-p | |
211 | 'eshell-dirs-substitute-cd) | |
212 | eshell-interpreter-alist))) | |
213 | ||
affbf647 GM |
214 | (add-hook 'eshell-parse-argument-hook |
215 | 'eshell-parse-user-reference nil t) | |
216 | (if (eshell-under-windows-p) | |
217 | (add-hook 'eshell-parse-argument-hook | |
218 | 'eshell-parse-drive-letter nil t)) | |
219 | ||
220 | (when (eshell-using-module 'eshell-cmpl) | |
affbf647 GM |
221 | (add-hook 'pcomplete-try-first-hook |
222 | 'eshell-complete-user-reference nil t)) | |
223 | ||
224 | (make-local-variable 'eshell-dirstack) | |
225 | (make-local-variable 'eshell-last-dir-ring) | |
226 | ||
227 | (if eshell-last-dir-ring-file-name | |
228 | (eshell-read-last-dir-ring)) | |
229 | (unless eshell-last-dir-ring | |
230 | (setq eshell-last-dir-ring (make-ring eshell-last-dir-ring-size))) | |
231 | ||
affbf647 GM |
232 | (add-hook 'eshell-exit-hook 'eshell-write-last-dir-ring nil t) |
233 | ||
234 | (add-hook 'kill-emacs-hook 'eshell-save-some-last-dir)) | |
235 | ||
236 | (defun eshell-save-some-last-dir () | |
237 | "Save the list-dir-ring for any open Eshell buffers." | |
238 | (eshell-for buf (buffer-list) | |
239 | (if (buffer-live-p buf) | |
240 | (with-current-buffer buf | |
241 | (if (and eshell-mode | |
242 | eshell-ask-to-save-last-dir | |
243 | (or (eq eshell-ask-to-save-last-dir 'always) | |
244 | (y-or-n-p | |
245 | (format "Save last dir ring for Eshell buffer `%s'? " | |
246 | (buffer-name buf))))) | |
247 | (eshell-write-last-dir-ring)))))) | |
248 | ||
249 | (defun eshell-lone-directory-p (file) | |
250 | "Test whether FILE is just a directory name, and not a command name." | |
251 | (and (file-directory-p file) | |
252 | (or (file-name-directory file) | |
253 | (not (eshell-search-path file))))) | |
254 | ||
255 | (defun eshell-dirs-substitute-cd (&rest args) | |
256 | "Substitute the given command for a call to `cd' on that name." | |
257 | (if (> (length args) 1) | |
258 | (error "%s: command not found" (car args)) | |
259 | (throw 'eshell-replace-command | |
b4bd214e | 260 | (eshell-parse-command "cd" (eshell-flatten-list args))))) |
affbf647 GM |
261 | |
262 | (defun eshell-parse-user-reference () | |
263 | "An argument beginning with ~ is a filename to be expanded." | |
264 | (when (and (not eshell-current-argument) | |
265 | (eq (char-after) ?~)) | |
266 | (add-to-list 'eshell-current-modifiers 'expand-file-name) | |
267 | (forward-char) | |
268 | (char-to-string (char-before)))) | |
269 | ||
270 | (defun eshell-parse-drive-letter () | |
271 | "An argument beginning X:[^/] is a drive letter reference." | |
272 | (when (and (not eshell-current-argument) | |
273 | (looking-at "\\([A-Za-z]:\\)\\([^/\\\\]\\|\\'\\)")) | |
274 | (goto-char (match-end 1)) | |
275 | (let* ((letter (match-string 1)) | |
276 | (regexp (concat "\\`" letter)) | |
277 | (path (eshell-find-previous-directory regexp))) | |
278 | (concat (or path letter) | |
279 | (char-to-string directory-sep-char))))) | |
280 | ||
281 | (defun eshell-complete-user-reference () | |
282 | "If there is a user reference, complete it." | |
283 | (let ((arg (pcomplete-actual-arg))) | |
284 | (when (string-match "\\`~[a-z]*\\'" arg) | |
285 | (setq pcomplete-stub (substring arg 1) | |
286 | pcomplete-last-completion-raw t) | |
287 | (throw 'pcomplete-completions | |
288 | (progn | |
289 | (eshell-read-user-names) | |
290 | (pcomplete-uniqify-list | |
291 | (mapcar | |
292 | (function | |
293 | (lambda (user) | |
294 | (file-name-as-directory (cdr user)))) | |
295 | eshell-user-names))))))) | |
296 | ||
dace60cf | 297 | (defun eshell/pwd (&rest args) |
affbf647 GM |
298 | "Change output from `pwd` to be cleaner." |
299 | (let* ((path default-directory) | |
300 | (len (length path))) | |
301 | (if (and (> len 1) | |
302 | (eq (aref path (1- len)) directory-sep-char) | |
303 | (not (and (eshell-under-windows-p) | |
304 | (string-match "\\`[A-Za-z]:[\\\\/]\\'" path)))) | |
305 | (setq path (substring path 0 (1- (length path))))) | |
306 | (if eshell-pwd-convert-function | |
dace60cf JW |
307 | (funcall eshell-pwd-convert-function path) |
308 | path))) | |
affbf647 GM |
309 | |
310 | (defun eshell-expand-multiple-dots (path) | |
311 | "Convert '...' to '../..', '....' to '../../..', etc.. | |
312 | ||
313 | With the following piece of advice, you can make this functionality | |
314 | available in most of Emacs, with the exception of filename completion | |
315 | in the minibuffer: | |
316 | ||
317 | (defadvice expand-file-name | |
318 | (before translate-multiple-dots | |
319 | (filename &optional directory) activate) | |
320 | (setq filename (eshell-expand-multiple-dots filename)))" | |
321 | (while (string-match "\\.\\.\\(\\.+\\)" path) | |
322 | (let* ((extra-dots (match-string 1 path)) | |
323 | (len (length extra-dots)) | |
324 | replace-text) | |
325 | (while (> len 0) | |
326 | (setq replace-text | |
327 | (concat replace-text | |
328 | (char-to-string directory-sep-char) "..") | |
329 | len (1- len))) | |
330 | (setq path | |
331 | (replace-match replace-text t t path 1)))) | |
332 | path) | |
333 | ||
334 | (defun eshell-find-previous-directory (regexp) | |
335 | "Find the most recent last-dir matching REGEXP." | |
336 | (let ((index 0) | |
337 | (len (ring-length eshell-last-dir-ring)) | |
338 | oldpath) | |
339 | (if (> (length regexp) 0) | |
340 | (while (< index len) | |
341 | (setq oldpath (ring-ref eshell-last-dir-ring index)) | |
342 | (if (string-match regexp oldpath) | |
343 | (setq index len) | |
344 | (setq oldpath nil | |
345 | index (1+ index))))) | |
346 | oldpath)) | |
347 | ||
348 | (eval-when-compile | |
349 | (defvar dired-directory)) | |
350 | ||
351 | (defun eshell/cd (&rest args) ; all but first ignored | |
352 | "Alias to extend the behavior of `cd'." | |
b4bd214e | 353 | (setq args (eshell-flatten-list args)) |
affbf647 GM |
354 | (let ((path (car args)) |
355 | (subpath (car (cdr args))) | |
70a06174 | 356 | (case-fold-search (eshell-under-windows-p)) |
affbf647 GM |
357 | handled) |
358 | (if (numberp path) | |
359 | (setq path (number-to-string path))) | |
360 | (if (numberp subpath) | |
361 | (setq subpath (number-to-string subpath))) | |
362 | (cond | |
363 | (subpath | |
364 | (let ((curdir (eshell/pwd))) | |
365 | (if (string-match path curdir) | |
366 | (setq path (replace-match subpath nil nil curdir)) | |
367 | (error "Path substring '%s' not found" path)))) | |
368 | ((and path (string-match "^-\\([0-9]*\\)$" path)) | |
369 | (let ((index (match-string 1 path))) | |
370 | (setq path | |
371 | (ring-remove eshell-last-dir-ring | |
372 | (if index | |
373 | (string-to-int index) | |
374 | 0))))) | |
375 | ((and path (string-match "^=\\(.*\\)$" path)) | |
376 | (let ((oldpath (eshell-find-previous-directory | |
377 | (match-string 1 path)))) | |
378 | (if oldpath | |
379 | (setq path oldpath) | |
380 | (let ((len (ring-length eshell-last-dir-ring)) | |
381 | (index 0)) | |
382 | (if (= len 0) | |
383 | (error "Directory ring empty")) | |
ca7aae91 | 384 | (eshell-init-print-buffer) |
affbf647 | 385 | (while (< index len) |
ca7aae91 | 386 | (eshell-buffered-print |
affbf647 | 387 | (concat (number-to-string index) ": " |
ca7aae91 | 388 | (ring-ref eshell-last-dir-ring index) "\n")) |
affbf647 | 389 | (setq index (1+ index))) |
ca7aae91 | 390 | (eshell-flush) |
affbf647 GM |
391 | (setq handled t))))) |
392 | (path | |
393 | (setq path (eshell-expand-multiple-dots path)))) | |
394 | (unless handled | |
395 | (setq dired-directory (or path "~")) | |
396 | (let ((curdir (eshell/pwd))) | |
397 | (unless (equal curdir dired-directory) | |
398 | (eshell-add-to-dir-ring curdir)) | |
399 | (let ((result (cd dired-directory))) | |
400 | (and eshell-cd-shows-directory | |
401 | (eshell-printn result))) | |
402 | (run-hooks 'eshell-directory-change-hook) | |
403 | (if eshell-list-files-after-cd | |
404 | (throw 'eshell-replace-command | |
405 | (eshell-parse-command "ls" (cdr args)))) | |
406 | nil)))) | |
407 | ||
127fd3c2 JW |
408 | (put 'eshell/cd 'eshell-no-numeric-conversions t) |
409 | ||
affbf647 GM |
410 | (defun eshell-add-to-dir-ring (path) |
411 | "Add PATH to the last-dir-ring, if applicable." | |
412 | (unless (and (not (ring-empty-p eshell-last-dir-ring)) | |
413 | (equal path (ring-ref eshell-last-dir-ring 0))) | |
414 | (if eshell-last-dir-unique | |
415 | (let ((index 0) | |
416 | (len (ring-length eshell-last-dir-ring))) | |
417 | (while (< index len) | |
418 | (if (equal (ring-ref eshell-last-dir-ring index) path) | |
419 | (ring-remove eshell-last-dir-ring index) | |
420 | (setq index (1+ index)))))) | |
421 | (ring-insert eshell-last-dir-ring path))) | |
422 | ||
423 | ;;; pushd [+n | dir] | |
424 | (defun eshell/pushd (&rest args) ; all but first ignored | |
425 | "Implementation of pushd in Lisp." | |
426 | (let ((path (car args))) | |
427 | (cond | |
428 | ((null path) | |
429 | ;; no arg -- swap pwd and car of stack unless eshell-pushd-tohome | |
430 | (cond (eshell-pushd-tohome | |
431 | (eshell/pushd "~")) | |
432 | (eshell-dirstack | |
433 | (let ((old (eshell/pwd))) | |
434 | (eshell/cd (car eshell-dirstack)) | |
435 | (setq eshell-dirstack (cons old (cdr eshell-dirstack))) | |
436 | (eshell/dirs t))) | |
437 | (t | |
438 | (error "pushd: No other directory")))) | |
439 | ((string-match "^\\+\\([0-9]\\)" path) | |
440 | ;; pushd +n | |
441 | (setq path (string-to-number (match-string 1 path))) | |
442 | (cond ((> path (length eshell-dirstack)) | |
443 | (error "Directory stack not that deep")) | |
444 | ((= path 0) | |
445 | (error "Couldn't cd")) | |
446 | (eshell-pushd-dextract | |
447 | (let ((dir (nth (1- path) eshell-dirstack))) | |
448 | (eshell/popd path) | |
449 | (eshell/pushd (eshell/pwd)) | |
450 | (eshell/cd dir) | |
451 | (eshell/dirs t))) | |
452 | (t | |
453 | (let* ((ds (cons (eshell/pwd) eshell-dirstack)) | |
454 | (dslen (length ds)) | |
455 | (front (nthcdr path ds)) | |
456 | (back (nreverse (nthcdr (- dslen path) (reverse ds)))) | |
457 | (new-ds (append front back))) | |
458 | (eshell/cd (car new-ds)) | |
459 | (setq eshell-dirstack (cdr new-ds)) | |
460 | (eshell/dirs t))))) | |
461 | (t | |
462 | ;; pushd <dir> | |
463 | (let ((old-wd (eshell/pwd))) | |
464 | (eshell/cd path) | |
465 | (if (or (null eshell-pushd-dunique) | |
466 | (not (member old-wd eshell-dirstack))) | |
467 | (setq eshell-dirstack (cons old-wd eshell-dirstack))) | |
468 | (eshell/dirs t))))) | |
469 | nil) | |
470 | ||
127fd3c2 JW |
471 | (put 'eshell/pushd 'eshell-no-numeric-conversions t) |
472 | ||
affbf647 GM |
473 | ;;; popd [+n] |
474 | (defun eshell/popd (&rest args) | |
475 | "Implementation of popd in Lisp." | |
476 | (let ((ref (or (car args) "+0"))) | |
477 | (unless (and (stringp ref) | |
478 | (string-match "\\`\\([+-][0-9]+\\)\\'" ref)) | |
479 | (error "popd: bad arg `%s'" ref)) | |
480 | (setq ref (string-to-number (match-string 1 ref))) | |
481 | (cond ((= ref 0) | |
482 | (unless eshell-dirstack | |
483 | (error "popd: Directory stack empty")) | |
484 | (eshell/cd (car eshell-dirstack)) | |
485 | (setq eshell-dirstack (cdr eshell-dirstack)) | |
486 | (eshell/dirs t)) | |
487 | ((<= (abs ref) (length eshell-dirstack)) | |
488 | (let* ((ds (cons nil eshell-dirstack)) | |
489 | (cell (nthcdr (if (> ref 0) | |
490 | (1- ref) | |
491 | (+ (length eshell-dirstack) ref)) ds)) | |
492 | (dir (cadr cell))) | |
493 | (eshell/cd dir) | |
494 | (setcdr cell (cdr (cdr cell))) | |
495 | (setq eshell-dirstack (cdr ds)) | |
496 | (eshell/dirs t))) | |
497 | (t | |
498 | (error "Couldn't popd")))) | |
499 | nil) | |
500 | ||
127fd3c2 JW |
501 | (put 'eshell/popd 'eshell-no-numeric-conversions t) |
502 | ||
affbf647 GM |
503 | (defun eshell/dirs (&optional if-verbose) |
504 | "Implementation of dirs in Lisp." | |
505 | (when (or (not if-verbose) eshell-dirtrack-verbose) | |
506 | (let* ((msg "") | |
507 | (ds (cons (eshell/pwd) eshell-dirstack)) | |
508 | (home (expand-file-name "~/")) | |
509 | (homelen (length home))) | |
510 | (while ds | |
511 | (let ((dir (car ds))) | |
512 | (and (>= (length dir) homelen) | |
513 | (string= home (substring dir 0 homelen)) | |
514 | (setq dir (concat "~/" (substring dir homelen)))) | |
515 | (setq msg (concat msg (directory-file-name dir) " ")) | |
516 | (setq ds (cdr ds)))) | |
517 | msg))) | |
518 | ||
519 | (defun eshell-read-last-dir-ring () | |
520 | "Sets the buffer's `eshell-last-dir-ring' from a history file." | |
521 | (let ((file eshell-last-dir-ring-file-name)) | |
522 | (cond | |
523 | ((or (null file) | |
524 | (equal file "") | |
525 | (not (file-readable-p file))) | |
526 | nil) | |
527 | (t | |
528 | (let* ((count 0) | |
529 | (size eshell-last-dir-ring-size) | |
530 | (ring (make-ring size))) | |
531 | (with-temp-buffer | |
532 | (insert-file-contents file) | |
533 | ;; Save restriction in case file is already visited... | |
534 | ;; Watch for those date stamps in history files! | |
535 | (goto-char (point-max)) | |
536 | (while (and (< count size) | |
537 | (re-search-backward "^\\([^\n].*\\)$" nil t)) | |
538 | (ring-insert-at-beginning ring (match-string 1)) | |
539 | (setq count (1+ count))) | |
540 | ;; never allow the top element to equal the current | |
541 | ;; directory | |
542 | (while (and (not (ring-empty-p ring)) | |
543 | (equal (ring-ref ring 0) (eshell/pwd))) | |
544 | (ring-remove ring 0))) | |
545 | (setq eshell-last-dir-ring ring)))))) | |
546 | ||
547 | (defun eshell-write-last-dir-ring () | |
548 | "Writes the buffer's `eshell-last-dir-ring' to a history file." | |
549 | (let ((file eshell-last-dir-ring-file-name)) | |
550 | (cond | |
551 | ((or (null file) | |
552 | (equal file "") | |
553 | (null eshell-last-dir-ring) | |
554 | (ring-empty-p eshell-last-dir-ring)) | |
555 | nil) | |
556 | ((not (file-writable-p file)) | |
557 | (message "Cannot write last-dir-ring file %s" file)) | |
558 | (t | |
559 | (let* ((ring eshell-last-dir-ring) | |
560 | (index (ring-length ring))) | |
561 | (with-temp-buffer | |
562 | (while (> index 0) | |
563 | (setq index (1- index)) | |
564 | (insert (ring-ref ring index) ?\n)) | |
565 | (insert (eshell/pwd) ?\n) | |
566 | (eshell-with-private-file-modes | |
567 | (write-region (point-min) (point-max) file nil | |
568 | 'no-message)))))))) | |
569 | ||
570 | ;;; Code: | |
571 | ||
ab5796a9 | 572 | ;;; arch-tag: 1e9c5a95-f1bd-45f8-ad36-55aac706e787 |
affbf647 | 573 | ;;; em-dirs.el ends here |