1 ;;; multishell.el --- facilitate multiple local and remote shell buffers
3 ;; Copyright (C) 1999-2016 Free Software Foundation, Inc. and Ken Manheimer
5 ;; Author: Ken Manheimer <ken.manheimer@gmail.com>
7 ;; Created: 1999 -- first public availability
9 ;; URL: https://github.com/kenmanheimer/EmacsMultishell
13 ;; Easily use and navigate multiple shell buffers, including remote shells.
14 ;; Fundamentally, multishell is the function `multishell-pop-to-shell' -
15 ;; a la `pop-to-buffer' - plus a keybinding. Together, they enable you to:
17 ;; * Get to the input point from wherever you are in a shell buffer,
18 ;; ... or to any of your shell buffers, from anywhere inside emacs.
20 ;; * Use universal arguments to launch and choose among alternate shell buffers,
21 ;; ... and change which is the current default.
23 ;; * Easily restart disconnected shells, or shells from prior sessions
24 ;; ... the latter from Emacs builtin savehist minibuf history persistence
26 ;; * Append a path to a new shell name to launch a shell in that directory,
27 ;; ... and use a path with Emacs tramp syntax to launch a remote shell -
30 ;; * `#root/sudo:root@localhost:/etc` for a buffer named "*#root*" with a
31 ;; root shell starting in /etc.
33 ;; * `/ssh:example.net:` for a shell buffer in your homedir on example.net.
34 ;; The buffer will be named "*example.net*".
36 ;; * `#ex/ssh:example.net|sudo:root@example.net:/var/log` for a root shell
37 ;; starting in /var/log on example.net named "*#ex*".
39 ;; * 'interior/ssh:gateway.corp.com|ssh:interior.corp.com:' to go via
40 ;; gateway.corp.com to your homedir on interior.corp.com. The buffer
41 ;; will be named "*interior*". You could append a sudo hop, and so on.
43 ;; * Thanks to tramp, file visits from the shell will seamlessly be in
44 ;; the auspices of the target account, and relative to the current
45 ;; directory, on the host where the shell is running.
47 ;; * Manage your list of shells, current and past, as a collection.
49 ;; See the `multishell-pop-to-shell` docstring for details.
51 ;; Customize-group `multishell' to select and activate a keybinding and set
52 ;; various behaviors. Customize-group `savehist' to preserve buffer
53 ;; names/paths across emacs restarts.
56 ;; [the multishell repository](https://github.com/kenmanheimer/EmacsMultishell)
57 ;; issue tracker to report problems, suggestions, etc, and see that
58 ;; repository for a bit more documentation.
62 ;; * 2016-01-30 1.0.9 Ken Manheimer:
63 ;; - Add multishell-list for managing the collection of current and
64 ;; history-registered shells: edit, delete, and switch/pop to entries.
65 ;; Easy access by invoking `multishell-pop-to-shell' from in the
66 ;; `multishell-pop-to-shell' universal arg prompts.
67 ;; - Duplicate existing shell buffer names in completions, for distinction.
68 ;; - Add paths to buffers started without one, when multishell history dir
69 ;; tracking is enabled.
70 ;; - Major code cleanup:
71 ;; - Simplify multishell-start-shell-in-buffer, in particular using
72 ;; shell function, rather than unnecessarily going underneath it.
73 ;; - Establish multishell-name-from-entry as canonical name resolver.
74 ;; - Fallback to eval-after-load in emacs versions that lack
75 ;; with-eval-after-load (eg, emacs 23).
76 ;; - save-match-data, where match-string is used
77 ;; - resituate some helpers
78 ;; * 2016-01-24 1.0.8 Ken Manheimer:
79 ;; - Work around the shell/tramp mishandling of remote+sudo+homedir problem!
80 ;; The work around is clean and simple, basically using high-level `cd'
81 ;; API and not messing with the low-level default-directory setting.
82 ;; (Turns out the problem was not in my local config. Good riddance to the
83 ;; awkward failure handler!)
84 ;; - Clean up code resolving the destination shell, starting to document the
85 ;; decision tree in the process. See getting-to-a-shell.md in the
86 ;; multishell repository, https://github.com/kenmanheimer/EmacsMultishell
87 ;; - There may be some shake-out on resolving the destination shell, but
88 ;; this release gets the fundamental functionality soundly in place.
89 ;; * 2016-01-23 1.0.7 Ken Manheimer:
90 ;; - Remove notes about tramp remote+sudo+homedir problem. Apparently it's
91 ;; due to something in my local site configuration (happens with -q but
93 ;; * 2016-01-22 1.0.6 Ken Manheimer:
94 ;; - Add multishell-version function.
95 ;; - Tweak commentary/comments/docstrings.
96 ;; - Null old multishell-buffer-name-history var, if present.
97 ;; * 2016-01-16 1.0.5 Ken Manheimer:
98 ;; - History now includes paths, when designated.
99 ;; - Actively track current directory in history entries that have a path.
100 ;; Custom control: multishell-history-entry-tracks-current-directory
101 ;; - Offer to remove shell's history entry when buffer is killed.
102 ;; (Currently the only UI mechanism to remove history entries.)
103 ;; - Fix - prevent duplicate entries for same name but different paths
104 ;; - Fix - recognize and respect tramp path syntax to start in home dir
105 ;; - Simplify history var name, migrate existing history if any from old name
106 ;; * 2016-01-04 1.0.4 Ken Manheimer - Released to ELPA
107 ;; * 2016-01-02 Ken Manheimer - working on this in public, but not yet released.
109 ;; TODO and Known Issues:
111 ;; * Add custom shell launch prep actions
112 ;; - for, eg, port knocking, interface activations
113 ;; - shell commands to execute when shell name or path matches a regexp
114 ;; - list of (regexp, which - name, path, or both, command)
115 ;; * Adapt multishell-list facilities for all-completions
116 ;; - See info on minibuffer-completion-help, display-completion-list
117 ;; - implement markup for mouse selection
118 ;; * Investigate whether we can recognize and provide for failed hops.
119 ;; - Tramp doesn't provide useful reactions for any hop but the first
120 ;; - Might be stuff we can do to detect and convey failures?
121 ;; - Might be no recourse but to seek tramp changes.
122 ;; * Try minibuffer field boundary at beginning of tramp path, to see whether
123 ;; the field boundary magically enables tramp path completion.
130 (require 'multishell-list)
132 (defvar multishell-version "1.0.9")
133 (defun multishell-version (&optional here)
134 "Return string describing the loaded multishell version."
136 (let ((msg (concat "Multishell " multishell-version)))
137 (if here (insert msg)
138 (if (called-interactively-p 'interactive)
142 (defgroup multishell nil
143 "Allout extension that highlights outline structure graphically.
145 Customize `allout-widgets-auto-activation' to activate allout-widgets
149 (defcustom multishell-command-key "\M- "
150 "The key to use if `multishell-activate-command-key' is true.
152 You can instead manually bind `multishell-pop-to-shell` using emacs
153 lisp, eg: (global-set-key \"\\M- \" 'multishell-pop-to-shell)."
157 (defvar multishell--responsible-for-command-key nil
158 "Coordination for multishell key assignment.")
159 (defun multishell-activate-command-key-setter (symbol setting)
160 "Implement `multishell-activate-command-key' choice."
161 (set-default 'multishell-activate-command-key setting)
162 (when (or setting multishell--responsible-for-command-key)
163 (multishell-implement-command-key-choice (not setting))))
164 (defun multishell-implement-command-key-choice (&optional unbind)
165 "If settings dicate, implement binding of multishell command key.
167 If optional UNBIND is true, globally unbind the key.
169 * `multishell-activate-command-key' - Set this to get the binding or not.
170 * `multishell-command-key' - The key to use for the binding, if appropriate."
172 (when (and (boundp 'multishell-command-key) multishell-command-key)
173 (global-unset-key multishell-command-key)))
174 ((not (and (boundp 'multishell-activate-command-key)
175 (boundp 'multishell-command-key)))
177 ((and multishell-activate-command-key multishell-command-key)
178 (setq multishell--responsible-for-command-key t)
179 (global-set-key multishell-command-key 'multishell-pop-to-shell))))
181 (defcustom multishell-activate-command-key nil
182 "Set this to impose the `multishell-command-key' binding.
184 You can instead manually bind `multishell-pop-to-shell` using emacs
185 lisp, eg: (global-set-key \"\\M- \" 'multishell-pop-to-shell)."
187 :set 'multishell-activate-command-key-setter
190 ;; Implement the key customization whenever the package is loaded:
191 (if (fboundp 'with-eval-after-load)
192 (with-eval-after-load "multishell"
193 (multishell-implement-command-key-choice))
194 (eval-after-load "multishell"
195 (multishell-implement-command-key-choice)))
197 (defcustom multishell-pop-to-frame nil
198 "*If non-nil, jump to a frame already showing the shell, if another one is.
200 Otherwise, disregard already-open windows on the shell if they're
201 in another frame, and open a new window on the shell in the
204 \(Use `pop-up-windows' to change multishell other-window vs
205 current-window behavior.)"
209 (defcustom multishell-history-entry-tracks-current-directory t
210 "Maintain shell's current directory in its multishell history entry.
212 When set, the history entry for shells started with explicit
213 paths will track the shell's current working directory. (Explicit
214 paths will not be added to local shells started without one,
217 If `savehist-save-minibuffer-history' is enabled, the current
218 working directory of shells \(that were started with an explicit
219 path) will be conveyed between emacs sessions."
223 (defvar multishell-history nil
224 "Name/path entries, most recent first.")
225 ;; Migrate the few pre 1.0.5 users to changed history var:
226 (when (and (not multishell-history)
227 (boundp 'multishell-buffer-name-history)
228 multishell-buffer-name-history)
229 (setq multishell-history multishell-buffer-name-history
230 multishell-buffer-name-history nil))
232 (defvar multishell-primary-name "*shell*"
233 "Default shell name for un-modified multishell-pop-to-shell buffer target.
235 This is set by `multishell-pop-to-shell' as the current default,
236 when invoked with doubled universal argument.
238 If you want the designated primary that you have at the end of
239 one emacs session to be resumed at the next, customize
240 `savehist-additional-variables' to include the
241 `multishell-primary-name'.")
243 ;; Multiple entries happen because completion also adds name to history.
244 (defun multishell-register-name-to-path (name path)
245 "Add or replace entry associating NAME with PATH in `multishell-history'.
247 If NAME already had a PATH and new PATH is empty, retain the prior one.
249 Promote added/changed entry to the front of the list."
250 ;; Add or promote to the front, tracking path changes in the process.
251 (let* ((entries (multishell-history-entries name))
253 (dolist (entry entries)
254 (when (string= path "")
255 ;; Retain explicit established path.
256 (setq path (cadr (multishell-split-entry entry))))
257 (setq multishell-history (delete entry multishell-history)))
258 (setq multishell-history (push (concat name path)
259 multishell-history))))
261 (defun multishell-history-entries (name)
262 "Return `multishell-history' entry that starts with NAME, or nil if none."
264 (dolist (entry multishell-history)
265 (when (and (string-equal name (multishell-name-from-entry entry))
266 (not (member entry got)))
267 (setq got (cons entry got))))
271 (defun multishell-pop-to-shell (&optional arg name here)
272 "Easily navigate to and within multiple shell buffers, local and remote.
274 Use a single `universal-argument' (\\[universal-argument]) to launch and choose between
275 nalternate shell buffers, and a doubled universal argument to also set your
276 choice as the ongoing default. Append a path to a new shell name to launch
277 a shell in that directory, and use Emacs tramp syntax to launch a remote
278 shell. There is a shortcut to manage your list of current and
279 historical shells, collectively, using `multishell-list' - see below.
281 Customize-group `multishell' to set up a key binding and tweak behaviors.
283 Manage your collection of current and historical shells by
284 recursively invoking \\[multishell-pop-to-shell] at either of the
285 `multishell-pop-to-shell' universal argument prompts, or at any time via
286 \\[multishell-list]. Hit ? in the listing buffer for editing commands.
288 ==== Basic operation:
290 - If the current buffer is shell-mode (or shell-mode derived)
291 buffer then focus is moved to the process input point.
293 \(You can use a universal argument go to a different shell
294 buffer when already in a buffer that has a process - see
297 - If not in a shell buffer (or with universal argument), go to a
298 window that is already showing the (a) shell buffer, if any.
300 In this case, the cursor is left in its prior position in the
301 shell buffer. Repeating the command will then go to the
302 process input point, per the first item in this list.
304 We respect `pop-up-windows', so you can adjust it to set the
305 other-buffer/same-buffer behavior.
307 - Otherwise, start a new shell buffer, using the current
308 directory as the working directory.
310 If a buffer with the resulting name exists and its shell process
311 was disconnected or otherwise stopped, it's resumed.
313 ===== Universal arg to start and select between named shell buffers:
315 You can name alternate shell buffers to create or return to, by
316 prefixing your \\[multishell-pop-to-shell] invocation with single or double
317 `universal-argument', \\[universal-argument]:
319 - With a single universal argument, prompt for the buffer name
320 to use (without the asterisks that shell mode will put around
321 the name), defaulting to 'shell'.
323 Completion is available.
325 This combination makes it easy to start and switch across
326 multiple shell restarts.
328 - A double universal argument will prompt for the name *and* set
329 the default to that name, so the target shell becomes the
332 See `multishell-primary-name' for info about preserving the
333 setting across emacs restarts.
335 - Manage your collection of current and historical shells by
336 recursively invoking \\[multishell-pop-to-shell] at either of the
337 `multishell-pop-to-shell' universal argument prompts, or at any
338 time via \\[multishell-list]. Hit ? in the listing buffer for
341 ===== Select starting directory and remote host:
343 The shell buffer name you give to the prompt for a universal arg
344 can include an appended path. That will be used for the startup
345 directory. You can use tramp remote syntax to specify a remote
346 shell. If there is an element after a final '/', that's used for
347 the buffer name. Otherwise, the host, domain, or path is used.
351 * '#root/sudo:root@localhost:/etc' for a buffer named \"*#root*\" with a
352 root shell starting in /etc.
354 * '/ssh:example.net:' for a shell buffer in your homedir on example.net.
355 The buffer will be named \"*example.net*\".
357 * '#ex/ssh:example.net|sudo:root@example.net:/var/log' for a root shell
358 starting in /var/log on example.net named \"*#ex*\".
360 * 'interior/ssh:gateway.corp.com|ssh:interior.corp.com:' to go
361 via gateway.corp.com to your homedir on interior.corp.com. The
362 buffer will be named \"*interior*\". You could append a sudo
363 hop to the path, combining the previous example, and so on.
365 File visits from the shell, and many common emacs activities like
366 dired, will be on the host where the shell is running, in the
367 auspices of the target account, and relative to the current
370 You can change the startup path for a shell buffer by editing it
371 at the completion prompt. The new path will not take effect for
372 an already-running shell.
374 To remove a shell buffer's history entry, kill the buffer and
375 affirm removal of the entry when prompted.
377 ===== Activate savehist to retain shell buffer names and paths across Emacs restarts:
379 To have emacs maintain your history of shell buffer names and paths,
380 customize the savehist group to activate savehist."
384 (let ((token '(token)))
385 (if (window-minibuffer-p)
386 (throw 'multishell-do-list token)
388 (catch 'multishell-do-list
389 (multishell-pop-to-shell-worker arg name here)))
390 (multishell-list)))))
392 (defun multishell-pop-to-shell-worker (&optional arg name here)
393 "Do real work of `multishell-pop-to-shell', which see."
394 (let* ((from-buffer (current-buffer))
395 (from-buffer-is-shell (derived-mode-p 'shell-mode))
396 (primary-name-unbracketed (multishell-unbracket
397 multishell-primary-name))
398 (fallthrough-name (if from-buffer-is-shell
399 (buffer-name from-buffer)
400 primary-name-unbracketed))
401 (doublearg (equal arg '(16)))
402 (target-name-and-path
403 (multishell-resolve-target-name-and-path
406 (or (multishell-read-unbracketed-entry
407 (format "Shell buffer name [%s]%s "
408 primary-name-unbracketed
409 (if doublearg " <==" ":"))
410 primary-name-unbracketed)
411 primary-name-unbracketed))
412 (t fallthrough-name))))
413 (use-path (cadr target-name-and-path))
414 (target-shell-buffer-name (car target-name-and-path))
415 (target-buffer (get-buffer target-shell-buffer-name))
416 (curr-buff-proc (get-buffer-process from-buffer))
420 ;; Register early so the entry is pushed to the front:
421 (multishell-register-name-to-path (multishell-unbracket
422 target-shell-buffer-name)
426 (setq multishell-primary-name target-shell-buffer-name))
432 ((and (or curr-buff-proc from-buffer-is-shell)
434 (eq from-buffer target-buffer)
435 (not (eq target-shell-buffer-name (buffer-name from-buffer))))
436 ;; In a shell buffer, but not named - stay in buffer, but go to end.
437 (setq already-there t))
439 ((string= (buffer-name) target-shell-buffer-name)
440 ;; Already in the specified shell buffer:
441 (setq already-there t))
443 ((or (not target-buffer)
445 (multishell-get-visible-window-for-buffer target-buffer))))
446 ;; No preexisting shell buffer, or not in a visible window:
447 (when (not (get-buffer target-shell-buffer-name))
448 (message "Creating new shell buffer '%s'" target-shell-buffer-name))
450 (switch-to-buffer target-shell-buffer-name)
451 (pop-to-buffer target-shell-buffer-name pop-up-windows)))
453 ;; Buffer exists and already has a window - jump to it:
454 (t (if (and multishell-pop-to-frame
456 (not (equal (window-frame (selected-window))
457 (window-frame inwin))))
458 (select-frame-set-input-focus (window-frame inwin)))
459 (if (not (string= (buffer-name (current-buffer))
460 target-shell-buffer-name))
462 (switch-to-buffer target-shell-buffer-name)
463 (pop-to-buffer target-shell-buffer-name t)))))
465 ;; We're in the buffer. Activate:
467 (if (not (comint-check-proc (current-buffer)))
468 (multishell-start-shell-in-buffer (buffer-name (current-buffer))
471 ;; If the destination buffer has a stopped process, resume it:
472 (let ((process (get-buffer-process (current-buffer))))
473 (if (and process (equal 'stop (process-status process)))
474 (continue-process process)))
476 (when (or already-there
477 (equal (current-buffer) from-buffer))
478 (goto-char (point-max))
479 (and (get-buffer-process from-buffer)
480 (goto-char (process-mark (get-buffer-process from-buffer)))))))
482 (defun multishell-delete-history-name (name &optional ask)
483 "Remove all multishell history entries for NAME.
485 if optional ask is non-nil (default nil), ask before each deletion.
487 Return the last entry deleted."
489 (dolist (entry (multishell-history-entries name) got)
492 (y-or-n-p (format "Remove multishell history entry `%s'? "
495 multishell-history (delete entry multishell-history))))))
497 (defun multishell-kill-buffer-query-function ()
498 "Offer to remove multishell-history entry for buffer."
499 ;; Removal choice is crucial, so users can, eg, kill a shell with huge
500 ;; output backlog, while keeping the history entry to easily restart it.
502 ;; We use kill-buffer-query-functions instead of kill-buffer-hook because:
504 ;; 1. It enables the user to remove the history without actually killing a
505 ;; running buffer, by not confirming the subsequent running-proc query.
506 ;; 2. kill-buffer-hooks often fails to run when killing shell buffers!
507 ;; It's probably due to failures in other hooks - beyond our control -
508 ;; and anyway, I like the first reason well enough.
510 ;; (Use condition-case to avoid inadvertant disruption of kill-buffer
511 ;; activity. kill-buffer happens behind the scenes a whole lot.)
513 (and (derived-mode-p 'shell-mode)
514 (multishell-delete-history-name
515 (multishell-unbracket (buffer-name))
518 (message "multishell-kill-buffer-query-function error: %s" err)))
520 (add-hook 'kill-buffer-query-functions 'multishell-kill-buffer-query-function)
522 (defun multishell-get-visible-window-for-buffer (buffer)
523 "Return visible window containing buffer."
526 (function (lambda (win)
527 (if (and (eq (window-buffer win) buffer)
528 (equal (frame-parameter
529 (selected-frame) 'display)
531 (window-frame win) 'display)))
532 (throw 'got-a-vis win))))
536 (defun multishell-all-entries (&optional active-duplicated)
537 "Return multishell history, with active buffers listed first.
539 Optional ACTIVE-DUPLICATED will return a copy of
540 `multishell-history' with unbracketed names of active buffers,
541 sans paths, appended to the list, so they have short and long
543 ;; Reorder so active lead present lead historical entries:
544 (let (active-entries active-names present past splat name path buffer)
545 (dolist (entry multishell-history)
546 (setq splat (multishell-split-entry entry)
549 buffer (and name (get-buffer (multishell-bracket name))))
550 (if (buffer-live-p buffer)
551 (if (comint-check-proc buffer)
552 (setq active-entries (push entry active-entries)
553 active-names (push name active-names))
554 (setq present (push entry present)))
555 (setq past (push entry past))))
556 (setq multishell-history (append active-entries present past))
557 (if active-duplicated
558 (append multishell-history active-names)
559 multishell-history)))
561 (defun multishell-read-unbracketed-entry (prompt default &optional initial)
562 "PROMPT for shell buffer name, sans asterisks. Indicate DEFAULT in prompt.
564 Optional INITIAL is preliminary value to be edited.
566 Input and completion can include associated path, if any.
568 Return what's provided, if anything, else nil."
569 (let* ((candidates (multishell-all-entries 'active-duplicated))
570 (got (completing-read prompt
580 'multishell-history)))
581 (if (not (string= got ""))
585 (defun multishell-resolve-target-name-and-path (path-ish)
586 "Given name/tramp-path PATH-ISH, resolve buffer name and initial directory.
588 The name is the part of the string up to the first '/' slash, if
589 any. Missing pieces are filled in from remote path elements, if
590 any, and multishell history. Given a path and no name, either the
591 host-name, domain-name, final directory name, or local host name
594 Return them as a list (name path), with name asterisk-bracketed
595 and path nil if none resolved."
596 (let* ((splat (multishell-split-entry (or path-ish "")))
598 (name (or (car splat) (multishell-name-from-entry path))))
600 ;; Get path from history, if present.
601 (mapcar #'(lambda (entry)
602 (when (or (not path) (string= path ""))
603 (setq path (cadr (multishell-split-entry entry)))))
604 (multishell-history-entries
605 (multishell-unbracket name))))
606 (list (multishell-bracket name) path)))
608 (defun multishell-name-from-entry (entry)
609 "Derive a name for a shell buffer according to ENTRY."
611 (multishell-unbracket multishell-primary-name)
612 (let* ((splat (multishell-split-entry entry))
616 (if (file-remote-p path)
617 (let ((vec (tramp-dissect-file-name path)))
618 (or (tramp-file-name-host vec)
619 (tramp-file-name-domain vec)
620 (tramp-file-name-localname vec)
622 (multishell-unbracket multishell-primary-name))))))
624 (defun multishell-start-shell-in-buffer (buffer-name path)
625 "Start, restart, or continue a shell in BUFFER-NAME on PATH."
626 (let* ((buffer (get-buffer buffer-name))
630 (setq is-active (comint-check-proc buffer))
632 (when (and path (not is-active))
634 (when (and (derived-mode-p 'shell-mode) (file-remote-p path))
635 ;; Returning to disconnected remote shell - do some tidying:
636 (tramp-cleanup-connection
637 (tramp-dissect-file-name default-directory 'noexpand)
638 'keep-debug 'keep-password))
640 (when (file-remote-p path) (message "Connecting to %s" path))
645 (defun multishell-track-dirchange (name newpath)
646 "Change multishell history entry to track current directory."
647 (let* ((entries (multishell-history-entries name)))
648 (dolist (entry entries)
649 (let* ((name-path (multishell-split-entry entry))
650 (name (car name-path))
651 (path (or (cadr name-path) "")))
653 (let* ((is-remote (file-remote-p path))
654 (vec (and is-remote (tramp-dissect-file-name path nil)))
655 (localname (if is-remote
656 (tramp-file-name-localname vec)
659 (replace-regexp-in-string (if (string= localname "")
661 (regexp-quote localname))
671 (newpath (if is-remote
672 (tramp-make-tramp-file-name (aref vec 0)
678 (newentry (concat name newpath))
679 (membership (member entry multishell-history)))
681 (setcar membership newentry))))))))
682 (defvar multishell-was-default-directory ()
683 "Provide for tracking directory changes.")
684 (make-variable-buffer-local 'multishell-was-default-directory)
685 (defun multishell-post-command-business ()
686 "Do multishell bookkeeping."
687 ;; Update multishell-history with dir changes.
689 (when (and multishell-history-entry-tracks-current-directory
690 (derived-mode-p 'shell-mode))
691 (let ((curdir (if (file-remote-p default-directory)
692 (tramp-file-name-localname
693 (tramp-dissect-file-name default-directory))
695 (when (not (string= curdir (or multishell-was-default-directory "")))
696 (multishell-track-dirchange (multishell-unbracket (buffer-name))
698 (setq multishell-was-default-directory curdir)))
699 ;; To avoid disruption as a pervasive hook function, swallow all errors:
701 (message "multishell-post-command-business error: %s" err))))
702 (add-hook 'post-command-hook 'multishell-post-command-business)
704 (defun multishell-split-entry (entry)
705 "Given multishell name/path ENTRY, return the separated name and path pair.
707 Returns nil for empty parts, rather than the empty string."
709 (string-match "^\\([^/]*\\)\\(/?.*\\)?" entry)
710 (let ((name (match-string 1 entry))
711 (path (match-string 2 entry)))
712 (and (string= name "") (setq name nil))
713 (and (string= path "") (setq path nil))
715 (defun multishell-bracket (name)
716 "Return a copy of name, ensuring it has an asterisk at the beginning and end."
717 (if (not (string= (substring name 0 1) "*"))
718 (setq name (concat "*" name)))
719 (if (not (string= (substring name -1) "*"))
720 (setq name (concat name "*")))
722 (defun multishell-unbracket (name)
723 "Return a copy of name, removing asterisks, if any, at beginning and end."
724 (if (string= (substring name 0 1) "*")
725 (setq name (substring name 1)))
726 (if (string= (substring name -1) "*")
727 (setq name (substring name 0 -1)))
730 (provide 'multishell)
732 ;;; multishell.el ends here