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[emacs.git] / lisp / shell.el
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1 ;;; shell.el --- specialized comint.el for running the shell
3 ;; Copyright (C) 1988, 1993-1997, 2000-2011 Free Software Foundation, Inc.
5 ;; Author: Olin Shivers <shivers@cs.cmu.edu>
6 ;; Simon Marshall <simon@gnu.org>
7 ;; Maintainer: FSF <emacs-devel@gnu.org>
8 ;; Keywords: processes
10 ;; This file is part of GNU Emacs.
12 ;; GNU Emacs is free software: you can redistribute it and/or modify
13 ;; it under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation, either version 3 of the License, or
15 ;; (at your option) any later version.
17 ;; GNU Emacs is distributed in the hope that it will be useful,
18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ;; GNU General Public License for more details.
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
25 ;;; Commentary:
27 ;; This file defines a shell-in-a-buffer package (shell mode) built on
28 ;; top of comint mode. This is actually cmushell with things renamed
29 ;; to replace its counterpart in Emacs 18. cmushell is more
30 ;; featureful, robust, and uniform than the Emacs 18 version.
32 ;; Since this mode is built on top of the general command-interpreter-in-
33 ;; a-buffer mode (comint mode), it shares a common base functionality,
34 ;; and a common set of bindings, with all modes derived from comint mode.
35 ;; This makes these modes easier to use.
37 ;; For documentation on the functionality provided by comint mode, and
38 ;; the hooks available for customising it, see the file comint.el.
39 ;; For further information on shell mode, see the comments below.
41 ;; Needs fixin:
42 ;; When sending text from a source file to a subprocess, the process-mark can
43 ;; move off the window, so you can lose sight of the process interactions.
44 ;; Maybe I should ensure the process mark is in the window when I send
45 ;; text to the process? Switch selectable?
47 ;; YOUR .EMACS FILE
48 ;;=============================================================================
49 ;; Some suggestions for your .emacs file.
51 ;; ;; Define M-# to run some strange command:
52 ;; (eval-after-load "shell"
53 ;; '(define-key shell-mode-map "\M-#" 'shells-dynamic-spell))
55 ;; Brief Command Documentation:
56 ;;============================================================================
57 ;; Comint Mode Commands: (common to shell and all comint-derived modes)
59 ;; m-p comint-previous-input Cycle backwards in input history
60 ;; m-n comint-next-input Cycle forwards
61 ;; m-r comint-previous-matching-input Previous input matching a regexp
62 ;; m-s comint-next-matching-input Next input that matches
63 ;; m-c-l comint-show-output Show last batch of process output
64 ;; return comint-send-input
65 ;; c-d comint-delchar-or-maybe-eof Delete char unless at end of buff.
66 ;; c-c c-a comint-bol Beginning of line; skip prompt
67 ;; c-c c-u comint-kill-input ^u
68 ;; c-c c-w backward-kill-word ^w
69 ;; c-c c-c comint-interrupt-subjob ^c
70 ;; c-c c-z comint-stop-subjob ^z
71 ;; c-c c-\ comint-quit-subjob ^\
72 ;; c-c c-o comint-delete-output Delete last batch of process output
73 ;; c-c c-r comint-show-output Show last batch of process output
74 ;; c-c c-l comint-dynamic-list-input-ring List input history
75 ;; send-invisible Read line w/o echo & send to proc
76 ;; comint-continue-subjob Useful if you accidentally suspend
77 ;; top-level job
78 ;; comint-mode-hook is the comint mode hook.
80 ;; Shell Mode Commands:
81 ;; shell Fires up the shell process
82 ;; tab comint-dynamic-complete Complete filename/command/history
83 ;; m-? comint-dynamic-list-filename-completions
84 ;; List completions in help buffer
85 ;; m-c-f shell-forward-command Forward a shell command
86 ;; m-c-b shell-backward-command Backward a shell command
87 ;; dirs Resync the buffer's dir stack
88 ;; shell-dirtrack-mode Turn dir tracking on/off
89 ;; comint-strip-ctrl-m Remove trailing ^Ms from output
91 ;; The shell mode hook is shell-mode-hook
92 ;; comint-prompt-regexp is initialised to shell-prompt-pattern, for backwards
93 ;; compatibility.
95 ;; Read the rest of this file for more information.
97 ;;; Code:
99 (require 'comint)
101 ;;; Customization and Buffer Variables
103 (defgroup shell nil
104 "Running shell from within Emacs buffers."
105 :group 'processes
106 :group 'unix)
108 (defgroup shell-directories nil
109 "Directory support in shell mode."
110 :group 'shell)
112 (defgroup shell-faces nil
113 "Faces in shell buffers."
114 :group 'shell)
116 ;;;###autoload
117 (defcustom shell-dumb-shell-regexp (purecopy "cmd\\(proxy\\)?\\.exe")
118 "Regexp to match shells that don't save their command history, and
119 don't handle the backslash as a quote character. For shells that
120 match this regexp, Emacs will write out the command history when the
121 shell finishes, and won't remove backslashes when it unquotes shell
122 arguments."
123 :type 'regexp
124 :group 'shell)
126 (defcustom shell-prompt-pattern "^[^#$%>\n]*[#$%>] *"
127 "Regexp to match prompts in the inferior shell.
128 Defaults to \"^[^#$%>\\n]*[#$%>] *\", which works pretty well.
129 This variable is used to initialize `comint-prompt-regexp' in the
130 shell buffer.
132 If `comint-use-prompt-regexp' is nil, then this variable is only used
133 to determine paragraph boundaries. See Info node `Shell Prompts' for
134 how Shell mode treats paragraphs.
136 The pattern should probably not match more than one line. If it does,
137 Shell mode may become confused trying to distinguish prompt from input
138 on lines which don't start with a prompt.
140 This is a fine thing to set in your `.emacs' file."
141 :type 'regexp
142 :group 'shell)
144 (defcustom shell-completion-fignore nil
145 "List of suffixes to be disregarded during file/command completion.
146 This variable is used to initialize `comint-completion-fignore' in the shell
147 buffer. The default is nil, for compatibility with most shells.
148 Some people like (\"~\" \"#\" \"%\").
150 This is a fine thing to set in your `.emacs' file."
151 :type '(repeat (string :tag "Suffix"))
152 :group 'shell)
154 (defcustom shell-delimiter-argument-list nil ; '(?\| ?& ?< ?> ?\( ?\) ?\;)
155 "List of characters to recognize as separate arguments.
156 This variable is used to initialize `comint-delimiter-argument-list' in the
157 shell buffer. The value may depend on the operating system or shell."
158 :type '(choice (const nil)
159 (repeat :tag "List of characters" character))
160 :version "24.1" ; changed to nil (bug#8027)
161 :group 'shell)
163 (defvar shell-file-name-chars
164 (if (memq system-type '(ms-dos windows-nt cygwin))
165 "~/A-Za-z0-9_^$!#%&{}@`'.,:()-"
166 "[]~/A-Za-z0-9+@:_.$#%,={}-")
167 "String of characters valid in a file name.
168 This variable is used to initialize `comint-file-name-chars' in the
169 shell buffer. The value may depend on the operating system or shell.
171 This is a fine thing to set in your `.emacs' file.")
173 (defvar shell-file-name-quote-list
174 (if (memq system-type '(ms-dos windows-nt))
176 (append shell-delimiter-argument-list '(?\s ?$ ?\* ?\! ?\" ?\' ?\` ?\# ?\\)))
177 "List of characters to quote when in a file name.
178 This variable is used to initialize `comint-file-name-quote-list' in the
179 shell buffer. The value may depend on the operating system or shell.
181 This is a fine thing to set in your `.emacs' file.")
183 (defvar shell-dynamic-complete-functions
184 '(comint-replace-by-expanded-history
185 shell-dynamic-complete-environment-variable
186 shell-dynamic-complete-command
187 shell-replace-by-expanded-directory
188 shell-dynamic-complete-filename
189 comint-dynamic-complete-filename)
190 "List of functions called to perform completion.
191 This variable is used to initialize `comint-dynamic-complete-functions' in the
192 shell buffer.
194 This is a fine thing to set in your `.emacs' file.")
196 (defcustom shell-command-regexp "[^;&|\n]+"
197 "Regexp to match a single command within a pipeline.
198 This is used for directory tracking and does not do a perfect job."
199 :type 'regexp
200 :group 'shell)
202 (defcustom shell-command-separator-regexp "[;&|\n \t]*"
203 "Regexp to match a single command within a pipeline.
204 This is used for directory tracking and does not do a perfect job."
205 :type 'regexp
206 :group 'shell)
208 (defcustom shell-completion-execonly t
209 "If non-nil, use executable files only for completion candidates.
210 This mirrors the optional behavior of tcsh.
212 Detecting executability of files may slow command completion considerably."
213 :type 'boolean
214 :group 'shell)
216 (defcustom shell-popd-regexp "popd"
217 "Regexp to match subshell commands equivalent to popd."
218 :type 'regexp
219 :group 'shell-directories)
221 (defcustom shell-pushd-regexp "pushd"
222 "Regexp to match subshell commands equivalent to pushd."
223 :type 'regexp
224 :group 'shell-directories)
226 (defcustom shell-pushd-tohome nil
227 "If non-nil, make pushd with no arg behave as \"pushd ~\" (like cd).
228 This mirrors the optional behavior of tcsh."
229 :type 'boolean
230 :group 'shell-directories)
232 (defcustom shell-pushd-dextract nil
233 "If non-nil, make \"pushd +n\" pop the nth dir to the stack top.
234 This mirrors the optional behavior of tcsh."
235 :type 'boolean
236 :group 'shell-directories)
238 (defcustom shell-pushd-dunique nil
239 "If non-nil, make pushd only add unique directories to the stack.
240 This mirrors the optional behavior of tcsh."
241 :type 'boolean
242 :group 'shell-directories)
244 (defcustom shell-cd-regexp "cd"
245 "Regexp to match subshell commands equivalent to cd."
246 :type 'regexp
247 :group 'shell-directories)
249 (defcustom shell-chdrive-regexp
250 (if (memq system-type '(ms-dos windows-nt))
251 ; NetWare allows the five chars between upper and lower alphabetics.
252 "[]a-zA-Z^_`\\[\\\\]:"
253 nil)
254 "If non-nil, is regexp used to track drive changes."
255 :type '(choice regexp
256 (const nil))
257 :group 'shell-directories)
259 (defcustom shell-dirtrack-verbose t
260 "If non-nil, show the directory stack following directory change.
261 This is effective only if directory tracking is enabled.
262 The `dirtrack' package provides an alternative implementation of this feature -
263 see the function `dirtrack-mode'."
264 :type 'boolean
265 :group 'shell-directories)
267 (defcustom explicit-shell-file-name nil
268 "If non-nil, is file name to use for explicitly requested inferior shell."
269 :type '(choice (const :tag "None" nil) file)
270 :group 'shell)
272 ;; Note: There are no explicit references to the variable `explicit-csh-args'.
273 ;; It is used implicitly by M-x shell when the shell is `csh'.
274 (defcustom explicit-csh-args
275 (if (eq system-type 'hpux)
276 ;; -T persuades HP's csh not to think it is smarter
277 ;; than us about what terminal modes to use.
278 '("-i" "-T")
279 '("-i"))
280 "Args passed to inferior shell by \\[shell], if the shell is csh.
281 Value is a list of strings, which may be nil."
282 :type '(repeat (string :tag "Argument"))
283 :group 'shell)
285 ;; Note: There are no explicit references to the variable `explicit-bash-args'.
286 ;; It is used implicitly by M-x shell when the interactive shell is `bash'.
287 (defcustom explicit-bash-args
288 (let* ((prog (or (and (boundp 'explicit-shell-file-name) explicit-shell-file-name)
289 (getenv "ESHELL") shell-file-name))
290 (name (file-name-nondirectory prog)))
291 ;; Tell bash not to use readline, except for bash 1.x which
292 ;; doesn't grook --noediting. Bash 1.x has -nolineediting, but
293 ;; process-send-eof cannot terminate bash if we use it.
294 (if (and (not purify-flag)
295 (equal name "bash")
296 (file-executable-p prog)
297 (string-match "bad option"
298 (shell-command-to-string
299 (concat (shell-quote-argument prog)
300 " --noediting"))))
301 '("-i")
302 '("--noediting" "-i")))
303 "Args passed to inferior shell by \\[shell], if the shell is bash.
304 Value is a list of strings, which may be nil."
305 :type '(repeat (string :tag "Argument"))
306 :group 'shell)
308 (defcustom shell-input-autoexpand 'history
309 "If non-nil, expand input command history references on completion.
310 This mirrors the optional behavior of tcsh (its autoexpand and histlit).
312 If the value is `input', then the expansion is seen on input.
313 If the value is `history', then the expansion is only when inserting
314 into the buffer's input ring. See also `comint-magic-space' and
315 `comint-dynamic-complete'.
317 This variable supplies a default for `comint-input-autoexpand',
318 for Shell mode only."
319 :type '(choice (const :tag "off" nil)
320 (const input)
321 (const history)
322 (const :tag "on" t))
323 :group 'shell)
325 (defvar shell-dirstack nil
326 "List of directories saved by pushd in this buffer's shell.
327 Thus, this does not include the shell's current directory.")
329 (defvar shell-dirtrackp t
330 "Non-nil in a shell buffer means directory tracking is enabled.")
332 (defvar shell-last-dir nil
333 "Keep track of last directory for ksh `cd -' command.")
335 (defvar shell-dirstack-query nil
336 "Command used by `shell-resync-dirs' to query the shell.")
338 (defvar shell-mode-map
339 (let ((map (nconc (make-sparse-keymap) comint-mode-map)))
340 (define-key map "\C-c\C-f" 'shell-forward-command)
341 (define-key map "\C-c\C-b" 'shell-backward-command)
342 (define-key map "\t" 'comint-dynamic-complete)
343 (define-key map (kbd "M-RET") 'shell-resync-dirs)
344 (define-key map "\M-?" 'comint-dynamic-list-filename-completions)
345 (define-key map [menu-bar completion]
346 (cons "Complete"
347 (copy-keymap (lookup-key comint-mode-map [menu-bar completion]))))
348 (define-key-after (lookup-key map [menu-bar completion])
349 [complete-env-variable] '("Complete Env. Variable Name" .
350 shell-dynamic-complete-environment-variable)
351 'complete-file)
352 (define-key-after (lookup-key map [menu-bar completion])
353 [expand-directory] '("Expand Directory Reference" .
354 shell-replace-by-expanded-directory)
355 'complete-expand)
356 map))
358 (defcustom shell-mode-hook '()
359 "Hook for customizing Shell mode."
360 :type 'hook
361 :group 'shell)
363 (defvar shell-font-lock-keywords
364 '(("[ \t]\\([+-][^ \t\n]+\\)" 1 font-lock-comment-face)
365 ("^[^ \t\n]+:.*" . font-lock-string-face)
366 ("^\\[[1-9][0-9]*\\]" . font-lock-string-face))
367 "Additional expressions to highlight in Shell mode.")
369 ;;; Basic Procedures
371 (defcustom shell-dir-cookie-re nil
372 "Regexp matching your prompt, including some part of the current directory.
373 If your prompt includes the current directory or the last few elements of it,
374 set this to a pattern that matches your prompt and whose subgroup 1 matches
375 the directory part of it.
376 This is used by `shell-dir-cookie-watcher' to try and use this info
377 to track your current directory. It can be used instead of or in addition
378 to `dirtrack-mode'."
379 :group 'shell
380 :type '(choice (const nil) regexp))
382 (put 'shell-mode 'mode-class 'special)
384 (define-derived-mode shell-mode comint-mode "Shell"
385 "Major mode for interacting with an inferior shell.\\<shell-mode-map>
386 \\[comint-send-input] after the end of the process' output sends the text from
387 the end of process to the end of the current line.
388 \\[comint-send-input] before end of process output copies the current line minus the prompt to
389 the end of the buffer and sends it (\\[comint-copy-old-input] just copies the current line).
390 \\[send-invisible] reads a line of text without echoing it, and sends it to
391 the shell. This is useful for entering passwords. Or, add the function
392 `comint-watch-for-password-prompt' to `comint-output-filter-functions'.
394 If you want to make multiple shell buffers, rename the `*shell*' buffer
395 using \\[rename-buffer] or \\[rename-uniquely] and start a new shell.
397 If you want to make shell buffers limited in length, add the function
398 `comint-truncate-buffer' to `comint-output-filter-functions'.
400 If you accidentally suspend your process, use \\[comint-continue-subjob]
401 to continue it.
403 `cd', `pushd' and `popd' commands given to the shell are watched by Emacs to
404 keep this buffer's default directory the same as the shell's working directory.
405 While directory tracking is enabled, the shell's working directory is displayed
406 by \\[list-buffers] or \\[mouse-buffer-menu] in the `File' field.
407 \\[dirs] queries the shell and resyncs Emacs' idea of what the current
408 directory stack is.
409 \\[shell-dirtrack-mode] turns directory tracking on and off.
410 \(The `dirtrack' package provides an alternative implementation of this
411 feature - see the function `dirtrack-mode'.)
413 \\{shell-mode-map}
414 Customization: Entry to this mode runs the hooks on `comint-mode-hook' and
415 `shell-mode-hook' (in that order). Before each input, the hooks on
416 `comint-input-filter-functions' are run. After each shell output, the hooks
417 on `comint-output-filter-functions' are run.
419 Variables `shell-cd-regexp', `shell-chdrive-regexp', `shell-pushd-regexp'
420 and `shell-popd-regexp' are used to match their respective commands,
421 while `shell-pushd-tohome', `shell-pushd-dextract' and `shell-pushd-dunique'
422 control the behavior of the relevant command.
424 Variables `comint-completion-autolist', `comint-completion-addsuffix',
425 `comint-completion-recexact' and `comint-completion-fignore' control the
426 behavior of file name, command name and variable name completion. Variable
427 `shell-completion-execonly' controls the behavior of command name completion.
428 Variable `shell-completion-fignore' is used to initialize the value of
429 `comint-completion-fignore'.
431 Variables `comint-input-ring-file-name' and `comint-input-autoexpand' control
432 the initialization of the input ring history, and history expansion.
434 Variables `comint-output-filter-functions', a hook, and
435 `comint-scroll-to-bottom-on-input' and `comint-scroll-to-bottom-on-output'
436 control whether input and output cause the window to scroll to the end of the
437 buffer."
438 (setq comint-prompt-regexp shell-prompt-pattern)
439 (setq comint-completion-fignore shell-completion-fignore)
440 (setq comint-delimiter-argument-list shell-delimiter-argument-list)
441 (setq comint-file-name-chars shell-file-name-chars)
442 (setq comint-file-name-quote-list shell-file-name-quote-list)
443 (set (make-local-variable 'comint-dynamic-complete-functions)
444 shell-dynamic-complete-functions)
445 (set (make-local-variable 'paragraph-separate) "\\'")
446 (make-local-variable 'paragraph-start)
447 (setq paragraph-start comint-prompt-regexp)
448 (make-local-variable 'font-lock-defaults)
449 (setq font-lock-defaults '(shell-font-lock-keywords t))
450 (make-local-variable 'shell-dirstack)
451 (setq shell-dirstack nil)
452 (make-local-variable 'shell-last-dir)
453 (setq shell-last-dir nil)
454 (setq comint-input-autoexpand shell-input-autoexpand)
455 (shell-dirtrack-mode 1)
456 ;; This is not really correct, since the shell buffer does not really
457 ;; edit this directory. But it is useful in the buffer list and menus.
458 (setq list-buffers-directory (expand-file-name default-directory))
459 ;; shell-dependent assignments.
460 (when (ring-empty-p comint-input-ring)
461 (let ((shell (file-name-nondirectory (car
462 (process-command (get-buffer-process (current-buffer)))))))
463 (setq comint-input-ring-file-name
464 (or (getenv "HISTFILE")
465 (cond ((string-equal shell "bash") "~/.bash_history")
466 ((string-equal shell "ksh") "~/.sh_history")
467 (t "~/.history"))))
468 (if (or (equal comint-input-ring-file-name "")
469 (equal (file-truename comint-input-ring-file-name)
470 (file-truename "/dev/null")))
471 (setq comint-input-ring-file-name nil))
472 ;; Arrange to write out the input ring on exit, if the shell doesn't
473 ;; do this itself.
474 (if (and comint-input-ring-file-name
475 (string-match shell-dumb-shell-regexp shell))
476 (set-process-sentinel (get-buffer-process (current-buffer))
477 #'shell-write-history-on-exit))
478 (setq shell-dirstack-query
479 (cond ((string-equal shell "sh") "pwd")
480 ((string-equal shell "ksh") "echo $PWD ~-")
481 (t "dirs")))
482 ;; Bypass a bug in certain versions of bash.
483 (when (string-equal shell "bash")
484 (add-hook 'comint-output-filter-functions
485 'shell-filter-ctrl-a-ctrl-b nil t)))
486 (when shell-dir-cookie-re
487 ;; Watch for magic cookies in the output to track the current dir.
488 (add-hook 'comint-output-filter-functions
489 'shell-dir-cookie-watcher nil t))
490 (comint-read-input-ring t)))
492 (defun shell-filter-ctrl-a-ctrl-b (string)
493 "Remove `^A' and `^B' characters from comint output.
495 Bash uses these characters as internal quoting characters in its
496 prompt. Due to a bug in some bash versions (including 2.03,
497 2.04, and 2.05b), they may erroneously show up when bash is
498 started with the `--noediting' option and Select Graphic
499 Rendition (SGR) control sequences (formerly known as ANSI escape
500 sequences) are used to color the prompt.
502 This function can be put on `comint-output-filter-functions'.
503 The argument STRING is ignored."
504 (let ((pmark (process-mark (get-buffer-process (current-buffer)))))
505 (save-excursion
506 (goto-char (or (and (markerp comint-last-output-start)
507 (marker-position comint-last-output-start))
508 (point-min)))
509 (while (re-search-forward "[\C-a\C-b]" pmark t)
510 (replace-match "")))))
512 (defun shell-write-history-on-exit (process event)
513 "Called when the shell process is stopped.
515 Writes the input history to a history file
516 `comint-input-ring-file-name' using `comint-write-input-ring'
517 and inserts a short message in the shell buffer.
519 This function is a sentinel watching the shell interpreter process.
520 Sentinels will always get the two parameters PROCESS and EVENT."
521 ;; Write history.
522 (comint-write-input-ring)
523 (let ((buf (process-buffer process)))
524 (when (buffer-live-p buf)
525 (with-current-buffer buf
526 (insert (format "\nProcess %s %s\n" process event))))))
528 ;;;###autoload
529 (defun shell (&optional buffer)
530 "Run an inferior shell, with I/O through BUFFER (which defaults to `*shell*').
531 Interactively, a prefix arg means to prompt for BUFFER.
532 If `default-directory' is a remote file name, it is also prompted
533 to change if called with a prefix arg.
535 If BUFFER exists but shell process is not running, make new shell.
536 If BUFFER exists and shell process is running, just switch to BUFFER.
537 Program used comes from variable `explicit-shell-file-name',
538 or (if that is nil) from the ESHELL environment variable,
539 or (if that is nil) from `shell-file-name'.
540 If a file `~/.emacs_SHELLNAME' exists, or `~/.emacs.d/init_SHELLNAME.sh',
541 it is given as initial input (but this may be lost, due to a timing
542 error, if the shell discards input when it starts up).
543 The buffer is put in Shell mode, giving commands for sending input
544 and controlling the subjobs of the shell. See `shell-mode'.
545 See also the variable `shell-prompt-pattern'.
547 To specify a coding system for converting non-ASCII characters
548 in the input and output to the shell, use \\[universal-coding-system-argument]
549 before \\[shell]. You can also specify this with \\[set-buffer-process-coding-system]
550 in the shell buffer, after you start the shell.
551 The default comes from `process-coding-system-alist' and
552 `default-process-coding-system'.
554 The shell file name (sans directories) is used to make a symbol name
555 such as `explicit-csh-args'. If that symbol is a variable,
556 its value is used as a list of arguments when invoking the shell.
557 Otherwise, one argument `-i' is passed to the shell.
559 \(Type \\[describe-mode] in the shell buffer for a list of commands.)"
560 (interactive
561 (list
562 (and current-prefix-arg
563 (prog1
564 (read-buffer "Shell buffer: "
565 (generate-new-buffer-name "*shell*"))
566 (if (file-remote-p default-directory)
567 ;; It must be possible to declare a local default-directory.
568 ;; FIXME: This can't be right: it changes the default-directory
569 ;; of the current-buffer rather than of the *shell* buffer.
570 (setq default-directory
571 (expand-file-name
572 (read-directory-name
573 "Default directory: " default-directory default-directory
574 t nil))))))))
575 (require 'ansi-color)
576 (setq buffer (if (or buffer (not (derived-mode-p 'shell-mode))
577 (comint-check-proc (current-buffer)))
578 (get-buffer-create (or buffer "*shell*"))
579 ;; If the current buffer is a dead shell buffer, use it.
580 (current-buffer)))
581 ;; Pop to buffer, so that the buffer's window will be correctly set
582 ;; when we call comint (so that comint sets the COLUMNS env var properly).
583 (pop-to-buffer buffer)
584 (unless (comint-check-proc buffer)
585 (let* ((prog (or explicit-shell-file-name
586 (getenv "ESHELL") shell-file-name))
587 (name (file-name-nondirectory prog))
588 (startfile (concat "~/.emacs_" name))
589 (xargs-name (intern-soft (concat "explicit-" name "-args"))))
590 (unless (file-exists-p startfile)
591 (setq startfile (concat user-emacs-directory "init_" name ".sh")))
592 (apply 'make-comint-in-buffer "shell" buffer prog
593 (if (file-exists-p startfile) startfile)
594 (if (and xargs-name (boundp xargs-name))
595 (symbol-value xargs-name)
596 '("-i")))
597 (shell-mode)))
598 buffer)
600 ;; Don't do this when shell.el is loaded, only while dumping.
601 ;;;###autoload (add-hook 'same-window-buffer-names (purecopy "*shell*"))
603 ;;; Directory tracking
605 ;; This code provides the shell mode input sentinel
606 ;; SHELL-DIRECTORY-TRACKER
607 ;; that tracks cd, pushd, and popd commands issued to the shell, and
608 ;; changes the current directory of the shell buffer accordingly.
610 ;; This is basically a fragile hack, although it's more accurate than
611 ;; the version in Emacs 18's shell.el. It has the following failings:
612 ;; 1. It doesn't know about the cdpath shell variable.
613 ;; 2. It cannot infallibly deal with command sequences, though it does well
614 ;; with these and with ignoring commands forked in another shell with ()s.
615 ;; 3. More generally, any complex command is going to throw it. Otherwise,
616 ;; you'd have to build an entire shell interpreter in Emacs Lisp. Failing
617 ;; that, there's no way to catch shell commands where cd's are buried
618 ;; inside conditional expressions, aliases, and so forth.
620 ;; The whole approach is a crock. Shell aliases mess it up. File sourcing
621 ;; messes it up. You run other processes under the shell; these each have
622 ;; separate working directories, and some have commands for manipulating
623 ;; their w.d.'s (e.g., the lcd command in ftp). Some of these programs have
624 ;; commands that do *not* affect the current w.d. at all, but look like they
625 ;; do (e.g., the cd command in ftp). In shells that allow you job
626 ;; control, you can switch between jobs, all having different w.d.'s. So
627 ;; simply saying %3 can shift your w.d..
629 ;; The solution is to relax, not stress out about it, and settle for
630 ;; a hack that works pretty well in typical circumstances. Remember
631 ;; that a half-assed solution is more in keeping with the spirit of Unix,
632 ;; anyway. Blech.
634 ;; One good hack not implemented here for users of programmable shells
635 ;; is to program up the shell w.d. manipulation commands to output
636 ;; a coded command sequence to the tty. Something like
637 ;; ESC | <cwd> |
638 ;; where <cwd> is the new current working directory. Then trash the
639 ;; directory tracking machinery currently used in this package, and
640 ;; replace it with a process filter that watches for and strips out
641 ;; these messages.
643 (defun shell-dir-cookie-watcher (text)
644 ;; This is fragile: the TEXT could be split into several chunks and we'd
645 ;; miss it. Oh well. It's a best effort anyway. I'd expect that it's
646 ;; rather unusual to have the prompt split into several packets, but
647 ;; I'm sure Murphy will prove me wrong.
648 (when (and shell-dir-cookie-re (string-match shell-dir-cookie-re text))
649 (let ((dir (match-string 1 text)))
650 (cond
651 ((file-name-absolute-p dir) (shell-cd dir))
652 ;; Let's try and see if it seems to be up or down from where we were.
653 ((string-match "\\`\\(.*\\)\\(?:/.*\\)?\n\\(.*/\\)\\1\\(?:/.*\\)?\\'"
654 (setq text (concat dir "\n" default-directory)))
655 (shell-cd (concat (match-string 2 text) dir)))))))
657 (defun shell-directory-tracker (str)
658 "Tracks cd, pushd and popd commands issued to the shell.
659 This function is called on each input passed to the shell.
660 It watches for cd, pushd and popd commands and sets the buffer's
661 default directory to track these commands.
663 You may toggle this tracking on and off with \\[shell-dirtrack-mode].
664 If Emacs gets confused, you can resync with the shell with \\[dirs].
665 \(The `dirtrack' package provides an alternative implementation of this
666 feature - see the function `dirtrack-mode'.)
668 See variables `shell-cd-regexp', `shell-chdrive-regexp', `shell-pushd-regexp',
669 and `shell-popd-regexp', while `shell-pushd-tohome', `shell-pushd-dextract',
670 and `shell-pushd-dunique' control the behavior of the relevant command.
672 Environment variables are expanded, see function `substitute-in-file-name'."
673 (if shell-dirtrackp
674 ;; We fail gracefully if we think the command will fail in the shell.
675 (condition-case chdir-failure
676 (let ((start (progn (string-match
677 (concat "^" shell-command-separator-regexp)
678 str) ; skip whitespace
679 (match-end 0)))
680 end cmd arg1)
681 (while (string-match shell-command-regexp str start)
682 (setq end (match-end 0)
683 cmd (comint-arguments (substring str start end) 0 0)
684 arg1 (comint-arguments (substring str start end) 1 1))
685 (if arg1
686 (setq arg1 (shell-unquote-argument arg1)))
687 (cond ((string-match (concat "\\`\\(" shell-popd-regexp
688 "\\)\\($\\|[ \t]\\)")
689 cmd)
690 (shell-process-popd (comint-substitute-in-file-name arg1)))
691 ((string-match (concat "\\`\\(" shell-pushd-regexp
692 "\\)\\($\\|[ \t]\\)")
693 cmd)
694 (shell-process-pushd (comint-substitute-in-file-name arg1)))
695 ((string-match (concat "\\`\\(" shell-cd-regexp
696 "\\)\\($\\|[ \t]\\)")
697 cmd)
698 (shell-process-cd (comint-substitute-in-file-name arg1)))
699 ((and shell-chdrive-regexp
700 (string-match (concat "\\`\\(" shell-chdrive-regexp
701 "\\)\\($\\|[ \t]\\)")
702 cmd))
703 (shell-process-cd (comint-substitute-in-file-name cmd))))
704 (setq start (progn (string-match shell-command-separator-regexp
705 str end)
706 ;; skip again
707 (match-end 0)))))
708 (error "Couldn't cd"))))
710 (defun shell-unquote-argument (string)
711 "Remove all kinds of shell quoting from STRING."
712 (save-match-data
713 (let ((idx 0) next inside
714 (quote-chars
715 (if (string-match shell-dumb-shell-regexp
716 (file-name-nondirectory
717 (car (process-command (get-buffer-process (current-buffer))))))
718 "['`\"]"
719 "[\\'`\"]")))
720 (while (and (< idx (length string))
721 (setq next (string-match quote-chars string next)))
722 (cond ((= (aref string next) ?\\)
723 (setq string (replace-match "" nil nil string))
724 (setq next (1+ next)))
725 ((and inside (= (aref string next) inside))
726 (setq string (replace-match "" nil nil string))
727 (setq inside nil))
728 (inside
729 (setq next (1+ next)))
731 (setq inside (aref string next))
732 (setq string (replace-match "" nil nil string)))))
733 string)))
735 ;; popd [+n]
736 (defun shell-process-popd (arg)
737 (let ((num (or (shell-extract-num arg) 0)))
738 (cond ((and num (= num 0) shell-dirstack)
739 (shell-cd (shell-prefixed-directory-name (car shell-dirstack)))
740 (setq shell-dirstack (cdr shell-dirstack))
741 (shell-dirstack-message))
742 ((and num (> num 0) (<= num (length shell-dirstack)))
743 (let* ((ds (cons nil shell-dirstack))
744 (cell (nthcdr (1- num) ds)))
745 (rplacd cell (cdr (cdr cell)))
746 (setq shell-dirstack (cdr ds))
747 (shell-dirstack-message)))
749 (error "Couldn't popd")))))
751 ;; Return DIR prefixed with comint-file-name-prefix as appropriate.
752 (defun shell-prefixed-directory-name (dir)
753 (if (= (length comint-file-name-prefix) 0)
755 (if (file-name-absolute-p dir)
756 ;; The name is absolute, so prepend the prefix.
757 (concat comint-file-name-prefix dir)
758 ;; For relative name we assume default-directory already has the prefix.
759 (expand-file-name dir))))
761 ;; cd [dir]
762 (defun shell-process-cd (arg)
763 (let ((new-dir (cond ((zerop (length arg)) (concat comint-file-name-prefix
764 "~"))
765 ((string-equal "-" arg) shell-last-dir)
766 (t (shell-prefixed-directory-name arg)))))
767 (setq shell-last-dir default-directory)
768 (shell-cd new-dir)
769 (shell-dirstack-message)))
771 ;; pushd [+n | dir]
772 (defun shell-process-pushd (arg)
773 (let ((num (shell-extract-num arg)))
774 (cond ((zerop (length arg))
775 ;; no arg -- swap pwd and car of stack unless shell-pushd-tohome
776 (cond (shell-pushd-tohome
777 (shell-process-pushd (concat comint-file-name-prefix "~")))
778 (shell-dirstack
779 (let ((old default-directory))
780 (shell-cd (car shell-dirstack))
781 (setq shell-dirstack (cons old (cdr shell-dirstack)))
782 (shell-dirstack-message)))
784 (message "Directory stack empty."))))
785 ((numberp num)
786 ;; pushd +n
787 (cond ((> num (length shell-dirstack))
788 (message "Directory stack not that deep."))
789 ((= num 0)
790 (error (message "Couldn't cd")))
791 (shell-pushd-dextract
792 (let ((dir (nth (1- num) shell-dirstack)))
793 (shell-process-popd arg)
794 (shell-process-pushd default-directory)
795 (shell-cd dir)
796 (shell-dirstack-message)))
798 (let* ((ds (cons default-directory shell-dirstack))
799 (dslen (length ds))
800 (front (nthcdr num ds))
801 (back (reverse (nthcdr (- dslen num) (reverse ds))))
802 (new-ds (append front back)))
803 (shell-cd (car new-ds))
804 (setq shell-dirstack (cdr new-ds))
805 (shell-dirstack-message)))))
807 ;; pushd <dir>
808 (let ((old-wd default-directory))
809 (shell-cd (shell-prefixed-directory-name arg))
810 (if (or (null shell-pushd-dunique)
811 (not (member old-wd shell-dirstack)))
812 (setq shell-dirstack (cons old-wd shell-dirstack)))
813 (shell-dirstack-message))))))
815 ;; If STR is of the form +n, for n>0, return n. Otherwise, nil.
816 (defun shell-extract-num (str)
817 (and (string-match "^\\+[1-9][0-9]*$" str)
818 (string-to-number str)))
820 (defvaralias 'shell-dirtrack-mode 'shell-dirtrackp)
821 (define-minor-mode shell-dirtrack-mode
822 "Turn directory tracking on and off in a shell buffer.
823 The `dirtrack' package provides an alternative implementation of this
824 feature - see the function `dirtrack-mode'."
825 nil nil nil
826 (setq list-buffers-directory (if shell-dirtrack-mode default-directory))
827 (if shell-dirtrack-mode
828 (add-hook 'comint-input-filter-functions 'shell-directory-tracker nil t)
829 (remove-hook 'comint-input-filter-functions 'shell-directory-tracker t)))
831 (define-obsolete-function-alias 'shell-dirtrack-toggle 'shell-dirtrack-mode
832 "23.1")
834 (defun shell-cd (dir)
835 "Do normal `cd' to DIR, and set `list-buffers-directory'."
836 (cd dir)
837 (if shell-dirtrackp
838 (setq list-buffers-directory default-directory)))
840 (defun shell-resync-dirs ()
841 "Resync the buffer's idea of the current directory stack.
842 This command queries the shell with the command bound to
843 `shell-dirstack-query' (default \"dirs\"), reads the next
844 line output and parses it to form the new directory stack.
845 DON'T issue this command unless the buffer is at a shell prompt.
846 Also, note that if some other subprocess decides to do output
847 immediately after the query, its output will be taken as the
848 new directory stack -- you lose. If this happens, just do the
849 command again."
850 (interactive)
851 (let* ((proc (get-buffer-process (current-buffer)))
852 (pmark (process-mark proc))
853 (started-at-pmark (= (point) (marker-position pmark))))
854 (save-excursion
855 (goto-char pmark)
856 ;; If the process echoes commands, don't insert a fake command in
857 ;; the buffer or it will appear twice.
858 (unless comint-process-echoes
859 (insert shell-dirstack-query) (insert "\n"))
860 (sit-for 0) ; force redisplay
861 (comint-send-string proc shell-dirstack-query)
862 (comint-send-string proc "\n")
863 (set-marker pmark (point))
864 (let ((pt (point))
865 (regexp
866 (concat
867 (if comint-process-echoes
868 ;; Skip command echo if the process echoes
869 (concat "\\(" (regexp-quote shell-dirstack-query) "\n\\)")
870 "\\(\\)")
871 "\\(.+\n\\)")))
872 ;; This extra newline prevents the user's pending input from spoofing us.
873 (insert "\n") (backward-char 1)
874 ;; Wait for one line.
875 (while (not (looking-at regexp))
876 (accept-process-output proc)
877 (goto-char pt)))
878 (goto-char pmark) (delete-char 1) ; remove the extra newline
879 ;; That's the dirlist. grab it & parse it.
880 (let* ((dl (buffer-substring (match-beginning 2) (1- (match-end 2))))
881 (dl-len (length dl))
882 (ds '()) ; new dir stack
883 (i 0))
884 (while (< i dl-len)
885 ;; regexp = optional whitespace, (non-whitespace), optional whitespace
886 (string-match "\\s *\\(\\S +\\)\\s *" dl i) ; pick off next dir
887 (setq ds (cons (concat comint-file-name-prefix
888 (substring dl (match-beginning 1)
889 (match-end 1)))
890 ds))
891 (setq i (match-end 0)))
892 (let ((ds (nreverse ds)))
893 (condition-case nil
894 (progn (shell-cd (car ds))
895 (setq shell-dirstack (cdr ds)
896 shell-last-dir (car shell-dirstack))
897 (shell-dirstack-message))
898 (error (message "Couldn't cd"))))))
899 (if started-at-pmark (goto-char (marker-position pmark)))))
901 ;; For your typing convenience:
902 (defalias 'dirs 'shell-resync-dirs)
905 ;; Show the current dirstack on the message line.
906 ;; Pretty up dirs a bit by changing "/usr/jqr/foo" to "~/foo".
907 ;; (This isn't necessary if the dirlisting is generated with a simple "dirs".)
908 ;; All the commands that mung the buffer's dirstack finish by calling
909 ;; this guy.
910 (defun shell-dirstack-message ()
911 (when shell-dirtrack-verbose
912 (let* ((msg "")
913 (ds (cons default-directory shell-dirstack))
914 (home (expand-file-name (concat comint-file-name-prefix "~/")))
915 (homelen (length home)))
916 (while ds
917 (let ((dir (car ds)))
918 (and (>= (length dir) homelen)
919 (string= home (substring dir 0 homelen))
920 (setq dir (concat "~/" (substring dir homelen))))
921 ;; Strip off comint-file-name-prefix if present.
922 (and comint-file-name-prefix
923 (>= (length dir) (length comint-file-name-prefix))
924 (string= comint-file-name-prefix
925 (substring dir 0 (length comint-file-name-prefix)))
926 (setq dir (substring dir (length comint-file-name-prefix)))
927 (setcar ds dir))
928 (setq msg (concat msg (directory-file-name dir) " "))
929 (setq ds (cdr ds))))
930 (message "%s" msg))))
932 ;; This was mostly copied from shell-resync-dirs.
933 (defun shell-snarf-envar (var)
934 "Return as a string the shell's value of environment variable VAR."
935 (let* ((cmd (format "printenv '%s'\n" var))
936 (proc (get-buffer-process (current-buffer)))
937 (pmark (process-mark proc)))
938 (goto-char pmark)
939 (insert cmd)
940 (sit-for 0) ; force redisplay
941 (comint-send-string proc cmd)
942 (set-marker pmark (point))
943 (let ((pt (point))) ; wait for 1 line
944 ;; This extra newline prevents the user's pending input from spoofing us.
945 (insert "\n") (backward-char 1)
946 (while (not (looking-at ".+\n"))
947 (accept-process-output proc)
948 (goto-char pt)))
949 (goto-char pmark) (delete-char 1) ; remove the extra newline
950 (buffer-substring (match-beginning 0) (1- (match-end 0)))))
952 (defun shell-copy-environment-variable (variable)
953 "Copy the environment variable VARIABLE from the subshell to Emacs.
954 This command reads the value of the specified environment variable
955 in the shell, and sets the same environment variable in Emacs
956 \(what `getenv' in Emacs would return) to that value.
957 That value will affect any new subprocesses that you subsequently start
958 from Emacs."
959 (interactive (list (read-envvar-name "\
960 Copy Shell environment variable to Emacs: ")))
961 (setenv variable (shell-snarf-envar variable)))
963 (defun shell-forward-command (&optional arg)
964 "Move forward across ARG shell command(s). Does not cross lines.
965 See `shell-command-regexp'."
966 (interactive "p")
967 (let ((limit (line-end-position)))
968 (if (re-search-forward (concat shell-command-regexp "\\([;&|][\t ]*\\)+")
969 limit 'move arg)
970 (skip-syntax-backward " "))))
973 (defun shell-backward-command (&optional arg)
974 "Move backward across ARG shell command(s). Does not cross lines.
975 See `shell-command-regexp'."
976 (interactive "p")
977 (let ((limit (save-excursion (comint-bol nil) (point))))
978 (when (> limit (point))
979 (setq limit (line-beginning-position)))
980 (skip-syntax-backward " " limit)
981 (if (re-search-backward
982 (format "[;&|]+[\t ]*\\(%s\\)" shell-command-regexp) limit 'move arg)
983 (progn (goto-char (match-beginning 1))
984 (skip-chars-forward ";&|")))))
986 (defun shell-dynamic-complete-command ()
987 "Dynamically complete the command at point.
988 This function is similar to `comint-dynamic-complete-filename', except that it
989 searches `exec-path' (minus the trailing Emacs library path) for completion
990 candidates. Note that this may not be the same as the shell's idea of the
991 path.
993 Completion is dependent on the value of `shell-completion-execonly', plus
994 those that effect file completion. See `shell-dynamic-complete-as-command'.
996 Returns t if successful."
997 (interactive)
998 (let ((filename (comint-match-partial-filename)))
999 (if (and filename
1000 (save-match-data (not (string-match "[~/]" filename)))
1001 (eq (match-beginning 0)
1002 (save-excursion (shell-backward-command 1) (point))))
1003 (prog2 (unless (window-minibuffer-p (selected-window))
1004 (message "Completing command name..."))
1005 (shell-dynamic-complete-as-command)))))
1008 (defun shell-dynamic-complete-as-command ()
1009 "Dynamically complete at point as a command.
1010 See `shell-dynamic-complete-filename'. Returns t if successful."
1011 (let* ((filename (or (comint-match-partial-filename) ""))
1012 (filenondir (file-name-nondirectory filename))
1013 (path-dirs (cdr (reverse exec-path)))
1014 (cwd (file-name-as-directory (expand-file-name default-directory)))
1015 (ignored-extensions
1016 (and comint-completion-fignore
1017 (mapconcat (function (lambda (x) (concat (regexp-quote x) "$")))
1018 comint-completion-fignore "\\|")))
1019 (dir "") (comps-in-dir ())
1020 (file "") (abs-file-name "") (completions ()))
1021 ;; Go thru each dir in the search path, finding completions.
1022 (while path-dirs
1023 (setq dir (file-name-as-directory (comint-directory (or (car path-dirs) ".")))
1024 comps-in-dir (and (file-accessible-directory-p dir)
1025 (file-name-all-completions filenondir dir)))
1026 ;; Go thru each completion found, to see whether it should be used.
1027 (while comps-in-dir
1028 (setq file (car comps-in-dir)
1029 abs-file-name (concat dir file))
1030 (if (and (not (member file completions))
1031 (not (and ignored-extensions
1032 (string-match ignored-extensions file)))
1033 (or (string-equal dir cwd)
1034 (not (file-directory-p abs-file-name)))
1035 (or (null shell-completion-execonly)
1036 (file-executable-p abs-file-name)))
1037 (setq completions (cons file completions)))
1038 (setq comps-in-dir (cdr comps-in-dir)))
1039 (setq path-dirs (cdr path-dirs)))
1040 ;; OK, we've got a list of completions.
1041 (let ((success (let ((comint-completion-addsuffix nil))
1042 (comint-dynamic-simple-complete filenondir completions))))
1043 (if (and (memq success '(sole shortest)) comint-completion-addsuffix
1044 (not (file-directory-p (comint-match-partial-filename))))
1045 (insert " "))
1046 success)))
1048 (defun shell-dynamic-complete-filename ()
1049 "Dynamically complete the filename at point.
1050 This completes only if point is at a suitable position for a
1051 filename argument."
1052 (interactive)
1053 (let ((opoint (point))
1054 (beg (comint-line-beginning-position)))
1055 (when (save-excursion
1056 (goto-char (if (re-search-backward "[;|&]" beg t)
1057 (match-end 0)
1058 beg))
1059 (re-search-forward "[^ \t][ \t]" opoint t))
1060 (comint-dynamic-complete-as-filename))))
1062 (defun shell-match-partial-variable ()
1063 "Return the shell variable at point, or nil if none is found."
1064 (save-excursion
1065 (let ((limit (point)))
1066 (if (re-search-backward "[^A-Za-z0-9_{}]" nil 'move)
1067 (or (looking-at "\\$") (forward-char 1)))
1068 ;; Anchor the search forwards.
1069 (if (or (eolp) (looking-at "[^A-Za-z0-9_{}$]"))
1071 (re-search-forward "\\$?{?[A-Za-z0-9_]*}?" limit)
1072 (buffer-substring (match-beginning 0) (match-end 0))))))
1074 (defun shell-dynamic-complete-environment-variable ()
1075 "Dynamically complete the environment variable at point.
1076 Completes if after a variable, i.e., if it starts with a \"$\".
1077 See `shell-dynamic-complete-as-environment-variable'.
1079 This function is similar to `comint-dynamic-complete-filename', except that it
1080 searches `process-environment' for completion candidates. Note that this may
1081 not be the same as the interpreter's idea of variable names. The main problem
1082 with this type of completion is that `process-environment' is the environment
1083 which Emacs started with. Emacs does not track changes to the environment made
1084 by the interpreter. Perhaps it would be more accurate if this function was
1085 called `shell-dynamic-complete-process-environment-variable'.
1087 Returns non-nil if successful."
1088 (interactive)
1089 (let ((variable (shell-match-partial-variable)))
1090 (if (and variable (string-match "^\\$" variable))
1091 (prog2 (unless (window-minibuffer-p (selected-window))
1092 (message "Completing variable name..."))
1093 (shell-dynamic-complete-as-environment-variable)))))
1096 (defun shell-dynamic-complete-as-environment-variable ()
1097 "Dynamically complete at point as an environment variable.
1098 Used by `shell-dynamic-complete-environment-variable'.
1099 Uses `comint-dynamic-simple-complete'."
1100 (let* ((var (or (shell-match-partial-variable) ""))
1101 (variable (substring var (or (string-match "[^$({]\\|$" var) 0)))
1102 (variables (mapcar (function (lambda (x)
1103 (substring x 0 (string-match "=" x))))
1104 process-environment))
1105 (addsuffix comint-completion-addsuffix)
1106 (comint-completion-addsuffix nil)
1107 (success (comint-dynamic-simple-complete variable variables)))
1108 (if (memq success '(sole shortest))
1109 (let* ((var (shell-match-partial-variable))
1110 (variable (substring var (string-match "[^$({]" var)))
1111 (protection (cond ((string-match "{" var) "}")
1112 ((string-match "(" var) ")")
1113 (t "")))
1114 (suffix (cond ((null addsuffix) "")
1115 ((file-directory-p
1116 (comint-directory (getenv variable))) "/")
1117 (t " "))))
1118 (insert protection suffix)))
1119 success))
1122 (defun shell-replace-by-expanded-directory ()
1123 "Expand directory stack reference before point.
1124 Directory stack references are of the form \"=digit\" or \"=-\".
1125 See `default-directory' and `shell-dirstack'.
1127 Returns t if successful."
1128 (interactive)
1129 (if (comint-match-partial-filename)
1130 (save-excursion
1131 (goto-char (match-beginning 0))
1132 (let ((stack (cons default-directory shell-dirstack))
1133 (index (cond ((looking-at "=-/?")
1134 (length shell-dirstack))
1135 ((looking-at "=\\([0-9]+\\)/?")
1136 (string-to-number
1137 (buffer-substring
1138 (match-beginning 1) (match-end 1)))))))
1139 (cond ((null index)
1140 nil)
1141 ((>= index (length stack))
1142 (error "Directory stack not that deep"))
1144 (replace-match (file-name-as-directory (nth index stack)) t t)
1145 (message "Directory item: %d" index)
1146 t))))))
1148 (provide 'shell)
1150 ;;; shell.el ends here