| blob | 27f3411b4a93e34649e18c7d82f4701266e8633c |
1 ;;; esh-mode.el --- user interface -*- lexical-binding:t -*-
3 ;; Copyright (C) 1999-2014 Free Software Foundation, Inc.
5 ;; Author: John Wiegley <johnw@gnu.org>
7 ;; This file is part of GNU Emacs.
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 3 of the License, or
12 ;; (at your option) any later version.
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.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
22 ;;; Commentary:
24 ;; Basically, Eshell is used just like shell mode (<M-x shell>). The
25 ;; keystrokes for navigating the buffer, and accessing the command
26 ;; history, are identical. Unlike shell mode, however, Eshell mode's
27 ;; governing process is Emacs itself. With shell mode, an inferior
28 ;; shell process is executed that communicates with Emacs via comint
29 ;; -- a mode for handling sub-process interaction. Eshell mode, on
30 ;; the other hand, is a truly native Emacs shell. No subprocess are
31 ;; invoked except the ones requested by the user at the prompt.
32 ;;
33 ;; After entering a command, use <RET> to invoke it ([Command
34 ;; invocation]) . If there is a command on disk, it will be executed
35 ;; as in a normal shell. If there is no command by that name on disk,
36 ;; but a Lisp function with that name is defined, the Lisp function
37 ;; will be called, using the arguments passed on the command line.
38 ;;
39 ;; Some of the other features of the command interaction mode are:
40 ;;
41 ;; @ <M-RET> can be used to accumulate further commands while a
42 ;; command is currently running. Since all input is passed to the
43 ;; subprocess being executed, there is no automatic input queueing
44 ;; as there is with other shells.
45 ;;
46 ;; @ <C-c C-t> can be used to truncate the buffer if it grows too
47 ;; large.
48 ;;
49 ;; @ <C-c C-r> will move point to the beginning of the output of the
50 ;; last command. With a prefix argument, it will narrow to view
51 ;; only that output.
52 ;;
53 ;; @ <C-c C-o> will delete the output from the last command.
54 ;;
55 ;; @ <C-c C-f> will move forward a complete shell argument.
56 ;;
57 ;; @ <C-c C-b> will move backward a complete shell argument.
59 ;;; Code:
70 "This module contains code for handling input from the user."
74 ;;; User Variables:
77 "A hook that gets run when `eshell-mode' is unloaded."
82 "A hook that gets run when `eshell-mode' is entered."
87 "A hook that gets run the first time `eshell-mode' is entered.
88 That is to say, the first time during an Emacs session."
93 "A hook that is run whenever `eshell' is exited.
94 This hook is only run if exiting actually kills the buffer."
100 "If non-nil, kill the Eshell buffer on the `exit' command.
101 Otherwise, the buffer will simply be buried."
106 "Functions to call before input is processed.
107 The input is contained in the region from `eshell-last-input-start' to
108 `eshell-last-input-end'."
113 "If t, send any input immediately to a subprocess."
118 "Functions to call before input is parsed.
119 Each function is passed two arguments, which bounds the region of the
120 current input text."
125 "Controls whether input to interpreter causes window to scroll.
126 If nil, then do not scroll. If t or `all', scroll all windows showing
127 buffer. If `this', scroll only the selected window.
129 See `eshell-preinput-scroll-to-bottom'."
136 "Controls whether interpreter output causes window to scroll.
137 If nil, then do not scroll. If t or `all', scroll all windows showing
138 buffer. If `this', scroll only the selected window. If `others',
139 scroll only those that are not the selected window.
141 See variable `eshell-scroll-show-maximum-output' and function
142 `eshell-postoutput-scroll-to-bottom'."
150 "Controls how interpreter output causes window to scroll.
151 If non-nil, then show the maximum output when the window is scrolled.
153 See variable `eshell-scroll-to-bottom-on-output' and function
154 `eshell-postoutput-scroll-to-bottom'."
159 "The maximum size in lines for eshell buffers.
160 Eshell buffers are truncated from the top to be no greater than this
161 number, if the function `eshell-truncate-buffer' is on
162 `eshell-output-filter-functions'."
168 eshell-handle-control-codes
169 eshell-handle-ansi-color
170 eshell-watch-for-password-prompt)
171 "Functions to call before output is displayed.
172 These functions are only called for output that is displayed
173 interactively, and not for output which is redirected."
178 "Functions to call before output is inserted into the buffer.
179 These functions get one argument, a string containing the text to be
180 inserted. They return the string as it should be inserted."
186 "Regexp matching prompts for passwords in the inferior process.
187 This is used by `eshell-watch-for-password-prompt'."
192 "A function called from beginning of line to skip the prompt."
200 "If non-nil, let the user know a command is running in the mode line."
207 ;; Internal Variables:
209 ;; these are only set to `nil' initially for the sake of the
210 ;; byte-compiler, when compiling other files which `require' this one
248 ;; Give CR the same syntax as newline, for selective-display.
250 ;; (modify-syntax-entry ?\; "< " st)
254 ;; Used to be singlequote; changed for flonums.
267 ;; All non-word multibyte characters should be `symbol'.
283 st))
285 ;;; User Functions:
288 "Function added to `kill-buffer-hook' in Eshell buffers.
289 This runs the function `eshell-kill-processes-on-exit',
290 and the hook `eshell-exit-hook'."
291 ;; It's fine to run this unconditionally since it can be customized
292 ;; via the `eshell-kill-processes-on-exit' variable.
298 ;;;###autoload
300 "Emacs shell interactive mode."
303 ;; FIXME: What the hell!?
325 ;; without this, find-tag complains about read-only text being
326 ;; modified
337 (define-key eshell-command-map [(control ?m)] 'eshell-copy-old-input)
338 (define-key eshell-command-map [(control ?o)] 'eshell-kill-output)
339 (define-key eshell-command-map [(control ?r)] 'eshell-show-output)
340 (define-key eshell-command-map [(control ?t)] 'eshell-truncate-buffer)
341 (define-key eshell-command-map [(control ?u)] 'eshell-kill-input)
342 (define-key eshell-command-map [(control ?w)] 'backward-kill-word)
343 (define-key eshell-command-map [(control ?y)] 'eshell-repeat-argument)
345 (setq local-abbrev-table eshell-mode-abbrev-table)
347 (set (make-local-variable 'dired-directory) default-directory)
348 (set (make-local-variable 'list-buffers-directory)
349 (expand-file-name default-directory))
351 ;; always set the tab width to 8 in Eshell buffers, since external
352 ;; commands which do their own formatting almost always expect this
353 (set (make-local-variable 'tab-width) 8)
355 ;; don't ever use auto-fill in Eshell buffers
356 (setq auto-fill-function nil)
358 ;; always display everything from a return value
359 (if (boundp 'print-length)
360 (set (make-local-variable 'print-length) nil))
361 (if (boundp 'print-level)
362 (set (make-local-variable 'print-level) nil))
364 ;; set require-final-newline to nil; otherwise, all redirected
365 ;; output will end with a newline, whether or not the source
366 ;; indicated it!
367 (set (make-local-variable 'require-final-newline) nil)
369 (set (make-local-variable 'max-lisp-eval-depth)
370 (max 3000 max-lisp-eval-depth))
371 (set (make-local-variable 'max-specpdl-size)
372 (max 6000 max-lisp-eval-depth))
374 (set (make-local-variable 'eshell-last-input-start) (point-marker))
375 (set (make-local-variable 'eshell-last-input-end) (point-marker))
376 (set (make-local-variable 'eshell-last-output-start) (point-marker))
377 (set (make-local-variable 'eshell-last-output-end) (point-marker))
378 (set (make-local-variable 'eshell-last-output-block-begin) (point))
380 (let ((modules-list (copy-sequence eshell-modules-list)))
381 (make-local-variable 'eshell-modules-list)
382 (setq eshell-modules-list modules-list))
384 ;; load extension modules into memory. This will cause any global
385 ;; variables they define to be visible, since some of the core
386 ;; modules sometimes take advantage of their functionality if used.
387 (dolist (module eshell-modules-list)
388 (let ((module-fullname (symbol-name module))
389 module-shortname)
391 (setq module-shortname
392 (concat "em-" (match-string 1 module-fullname))))
393 (unless module-shortname
394 (error "Invalid Eshell module name: %s" module-fullname))
395 (unless (featurep (intern module-shortname))
396 (load module-shortname))))
398 (unless (file-exists-p eshell-directory-name)
399 (eshell-make-private-directory eshell-directory-name t))
401 ;; Load core Eshell modules, then extension modules, for this session.
402 (dolist (module (append (eshell-subgroups 'eshell) eshell-modules-list))
403 (let ((load-hook (intern-soft (format "%s-load-hook" module)))
404 (initfunc (intern-soft (format "%s-initialize" module))))
405 (when (and load-hook (boundp load-hook))
406 (if (memq initfunc (symbol-value load-hook)) (setq initfunc nil))
407 (run-hooks load-hook))
408 ;; So we don't need the -initialize functions on the hooks (b#5375).
409 (and initfunc (fboundp initfunc) (funcall initfunc))))
411 (if eshell-send-direct-to-subprocesses
412 (add-hook 'pre-command-hook 'eshell-intercept-commands t t))
414 (if eshell-scroll-to-bottom-on-input
415 (add-hook 'pre-command-hook 'eshell-preinput-scroll-to-bottom t t))
417 (when eshell-scroll-show-maximum-output
418 (set (make-local-variable 'scroll-conservatively) 1000))
420 (when eshell-status-in-mode-line
421 (add-hook 'eshell-pre-command-hook 'eshell-command-started nil t)
422 (add-hook 'eshell-post-command-hook 'eshell-command-finished nil t))
424 (add-hook 'kill-buffer-hook 'eshell-kill-buffer-function t t)
426 (if eshell-first-time-p
427 (run-hooks 'eshell-first-time-mode-hook))
428 (run-hooks 'eshell-post-command-hook))
430 (put 'eshell-mode 'mode-class 'special)
432 (defun eshell-command-started ()
433 "Indicate in the mode line that a command has started."
434 (setq eshell-command-running-string "**")
435 (force-mode-line-update))
437 (defun eshell-command-finished ()
438 "Indicate in the mode line that a command has finished."
439 (setq eshell-command-running-string "--")
440 (force-mode-line-update))
442 ;;; Internal Functions:
444 (defun eshell-toggle-direct-send ()
445 (interactive)
446 (if eshell-send-direct-to-subprocesses
447 (progn
448 (setq eshell-send-direct-to-subprocesses nil)
449 (remove-hook 'pre-command-hook 'eshell-intercept-commands t)
450 (message "Sending subprocess input on RET"))
451 (setq eshell-send-direct-to-subprocesses t)
452 (add-hook 'pre-command-hook 'eshell-intercept-commands t t)
453 (message "Sending subprocess input directly")))
455 (defun eshell-self-insert-command ()
456 (interactive)
457 (process-send-string
458 (eshell-interactive-process)
459 (char-to-string (if (symbolp last-command-event)
460 (get last-command-event 'ascii-character)
461 last-command-event))))
463 (defun eshell-intercept-commands ()
464 (when (and (eshell-interactive-process)
465 (not (and (integerp last-input-event)
466 (memq last-input-event '(?\C-x ?\C-c)))))
467 (let ((possible-events (where-is-internal this-command))
468 (name (symbol-name this-command))
469 (intercept t))
470 ;; Assume that any multikey combination which does NOT target an
471 ;; Eshell command, is a combo the user wants invoked rather than
472 ;; sent to the underlying subprocess.
473 (unless (and (> (length name) 7)
474 (equal (substring name 0 7) "eshell-"))
475 (while possible-events
476 (if (> (length (car possible-events)) 1)
477 (setq intercept nil possible-events nil)
478 (setq possible-events (cdr possible-events)))))
479 (if intercept
480 (setq this-command 'eshell-self-insert-command)))))
482 (declare-function find-tag-interactive "etags" (prompt &optional no-default))
484 (defun eshell-find-tag (&optional tagname next-p regexp-p)
485 "A special version of `find-tag' that ignores whether the text is read-only."
486 (interactive)
487 (require 'etags)
488 (let ((inhibit-read-only t)
489 (no-default (eobp))
490 (find-tag-default-function 'ignore))
491 (setq tagname (car (find-tag-interactive "Find tag: " no-default)))
492 (find-tag tagname next-p regexp-p)))
494 (defun eshell-move-argument (limit func property arg)
495 "Move forward ARG arguments."
496 (catch 'eshell-incomplete
497 (eshell-parse-arguments (save-excursion (eshell-bol) (point))
498 (line-end-position)))
499 (let ((pos (save-excursion
500 (funcall func 1)
501 (while (and (> arg 0) (/= (point) limit))
502 (if (get-text-property (point) property)
503 (setq arg (1- arg)))
504 (if (> arg 0)
505 (funcall func 1)))
506 (point))))
507 (goto-char pos)
508 (if (and (eq func 'forward-char)
509 (= (1+ pos) limit))
510 (forward-char 1))))
512 (defun eshell-forward-argument (&optional arg)
513 "Move forward ARG arguments."
514 (interactive "p")
515 (eshell-move-argument (point-max) 'forward-char 'arg-end arg))
517 (defun eshell-backward-argument (&optional arg)
518 "Move backward ARG arguments."
519 (interactive "p")
520 (eshell-move-argument (point-min) 'backward-char 'arg-begin arg))
522 (defun eshell-repeat-argument (&optional arg)
523 (interactive "p")
524 (let ((begin (save-excursion
525 (eshell-backward-argument arg)
526 (point))))
527 (kill-ring-save begin (point))
528 (yank)))
530 (defun eshell-bol ()
531 "Goes to the beginning of line, then skips past the prompt, if any."
532 (interactive)
533 (beginning-of-line)
534 (and eshell-skip-prompt-function
535 (funcall eshell-skip-prompt-function)))
537 (defsubst eshell-push-command-mark ()
538 "Push a mark at the end of the last input text."
539 (push-mark (1- eshell-last-input-end) t))
541 (custom-add-option 'eshell-pre-command-hook 'eshell-push-command-mark)
543 (defsubst eshell-goto-input-start ()
544 "Goto the start of the last command input.
545 Putting this function on `eshell-pre-command-hook' will mimic Plan 9's
546 9term behavior."
547 (goto-char eshell-last-input-start))
549 (custom-add-option 'eshell-pre-command-hook 'eshell-push-command-mark)
551 (defsubst eshell-interactive-print (string)
552 "Print STRING to the eshell display buffer."
553 (eshell-output-filter nil string))
555 (defsubst eshell-begin-on-new-line ()
556 "This function outputs a newline if not at beginning of line."
557 (save-excursion
558 (goto-char eshell-last-output-end)
559 (or (bolp)
562 (defsubst eshell-reset (&optional no-hooks)
563 "Output a prompt on a new line, aborting any current input.
564 If NO-HOOKS is non-nil, then `eshell-post-command-hook' won't be run."
565 (goto-char (point-max))
566 (setq eshell-last-input-start (point-marker)
567 eshell-last-input-end (point-marker)
568 eshell-last-output-start (point-marker)
569 eshell-last-output-block-begin (point)
570 eshell-last-output-end (point-marker))
571 (eshell-begin-on-new-line)
572 (unless no-hooks
573 (run-hooks 'eshell-post-command-hook)
574 (goto-char (point-max))))
576 (defun eshell-parse-command-input (beg end &optional args)
577 "Parse the command input from BEG to END.
578 The difference is that `eshell-parse-command' expects a complete
579 command string (and will error if it doesn't get one), whereas this
580 function will inform the caller whether more input is required.
582 If nil is returned, more input is necessary (probably because a
583 multi-line input string wasn't terminated properly). Otherwise, it
584 will return the parsed command."
585 (let (delim command)
586 (if (setq delim
587 (catch 'eshell-incomplete
588 (ignore
589 (setq command (eshell-parse-command (cons beg end)
590 args t)))))
591 (ignore
592 (message "Expecting completion of delimiter %c ..."
593 (if (listp delim)
594 (car delim)
595 delim)))
596 command)))
598 (defun eshell-update-markers (pmark)
599 "Update the input and output markers relative to point and PMARK."
600 (set-marker eshell-last-input-start pmark)
601 (set-marker eshell-last-input-end (point))
602 (set-marker eshell-last-output-end (point)))
604 (defun eshell-queue-input (&optional use-region)
605 "Queue the current input text for execution by Eshell.
606 Particularly, don't send the text to the current process, even if it's
607 waiting for input."
608 (interactive "P")
609 (eshell-send-input use-region t))
611 (defun eshell-send-input (&optional use-region queue-p no-newline)
612 "Send the input received to Eshell for parsing and processing.
613 After `eshell-last-output-end', sends all text from that marker to
614 point as input. Before that marker, calls `eshell-get-old-input' to
615 retrieve old input, copies it to the end of the buffer, and sends it.
617 If USE-REGION is non-nil, the current region (between point and mark)
618 will be used as input.
620 If QUEUE-P is non-nil, input will be queued until the next prompt,
621 rather than sent to the currently active process. If no process, the
622 input is processed immediately.
624 If NO-NEWLINE is non-nil, the input is sent without an implied final
625 newline."
626 (interactive "P")
627 ;; Note that the input string does not include its terminal newline.
628 (let ((proc-running-p (and (eshell-interactive-process)
629 (not queue-p)))
630 (inhibit-point-motion-hooks t)
631 after-change-functions)
632 (unless (and proc-running-p
633 (not (eq (process-status
634 (eshell-interactive-process)) 'run)))
635 (if (or proc-running-p
636 (>= (point) eshell-last-output-end))
637 (goto-char (point-max))
638 (let ((copy (eshell-get-old-input use-region)))
639 (goto-char eshell-last-output-end)
640 (insert-and-inherit copy)))
641 (unless (or no-newline
642 (and eshell-send-direct-to-subprocesses
643 proc-running-p))
645 (if proc-running-p
646 (progn
647 (eshell-update-markers eshell-last-output-end)
648 (if (or eshell-send-direct-to-subprocesses
649 (= eshell-last-input-start eshell-last-input-end))
650 (unless no-newline
652 (process-send-region (eshell-interactive-process)
653 eshell-last-input-start
654 eshell-last-input-end)))
655 (if (= eshell-last-output-end (point))
656 (run-hooks 'eshell-post-command-hook)
657 (let (input)
658 (eshell-condition-case err
659 (progn
660 (setq input (buffer-substring-no-properties
661 eshell-last-output-end (1- (point))))
662 (run-hook-with-args 'eshell-expand-input-functions
663 eshell-last-output-end (1- (point)))
664 (let ((cmd (eshell-parse-command-input
665 eshell-last-output-end (1- (point)))))
666 (when cmd
667 (eshell-update-markers eshell-last-output-end)
668 (setq input (buffer-substring-no-properties
669 eshell-last-input-start
670 (1- eshell-last-input-end)))
671 (run-hooks 'eshell-input-filter-functions)
672 (and (catch 'eshell-terminal
673 (ignore
674 (if (eshell-invoke-directly cmd)
675 (eval cmd)
676 (eshell-eval-command cmd input))))
677 (eshell-life-is-too-much)))))
678 (quit
679 (eshell-reset t)
680 (run-hooks 'eshell-post-command-hook)
681 (signal 'quit nil))
682 (error
683 (eshell-reset t)
684 (eshell-interactive-print
686 (run-hooks 'eshell-post-command-hook)
687 (insert-and-inherit input)))))))))
689 (defsubst eshell-kill-new ()
690 "Add the last input text to the kill ring."
691 (kill-ring-save eshell-last-input-start eshell-last-input-end))
693 (custom-add-option 'eshell-input-filter-functions 'eshell-kill-new)
695 (defun eshell-output-filter (process string)
696 "Send the output from PROCESS (STRING) to the interactive display.
697 This is done after all necessary filtering has been done."
698 (let ((oprocbuf (if process (process-buffer process)
699 (current-buffer)))
700 (inhibit-point-motion-hooks t)
701 after-change-functions)
702 (let ((functions eshell-preoutput-filter-functions))
703 (while (and functions string)
704 (setq string (funcall (car functions) string))
705 (setq functions (cdr functions))))
706 (if (and string oprocbuf (buffer-name oprocbuf))
707 (let (opoint obeg oend)
708 (with-current-buffer oprocbuf
709 (setq opoint (point))
710 (setq obeg (point-min))
711 (setq oend (point-max))
712 (let ((buffer-read-only nil)
713 (nchars (length string))
714 (ostart nil))
715 (widen)
716 (goto-char eshell-last-output-end)
717 (setq ostart (point))
718 (if (<= (point) opoint)
719 (setq opoint (+ opoint nchars)))
720 (if (< (point) obeg)
721 (setq obeg (+ obeg nchars)))
722 (if (<= (point) oend)
723 (setq oend (+ oend nchars)))
724 (insert-before-markers string)
725 (if (= (window-start) (point))
726 (set-window-start (selected-window)
727 (- (point) nchars)))
728 (if (= (point) eshell-last-input-end)
729 (set-marker eshell-last-input-end
730 (- eshell-last-input-end nchars)))
731 (set-marker eshell-last-output-start ostart)
732 (set-marker eshell-last-output-end (point))
733 (force-mode-line-update))
734 (narrow-to-region obeg oend)
735 (goto-char opoint)
736 (eshell-run-output-filters))))))
738 (defun eshell-run-output-filters ()
739 "Run the `eshell-output-filter-functions' on the current output."
740 (save-current-buffer
741 (run-hooks 'eshell-output-filter-functions))
742 (setq eshell-last-output-block-begin
743 (marker-position eshell-last-output-end)))
745 ;;; jww (1999-10-23): this needs testing
746 (defun eshell-preinput-scroll-to-bottom ()
747 "Go to the end of buffer in all windows showing it.
748 Movement occurs if point in the selected window is not after the
749 process mark, and `this-command' is an insertion command. Insertion
750 commands recognized are `self-insert-command', `yank', and
751 `hilit-yank'. Depends on the value of
752 `eshell-scroll-to-bottom-on-input'.
754 This function should be a pre-command hook."
755 (if (memq this-command '(self-insert-command yank hilit-yank))
756 (let* ((selected (selected-window))
757 (current (current-buffer))
758 (scroll eshell-scroll-to-bottom-on-input))
759 (if (< (point) eshell-last-output-end)
760 (if (eq scroll 'this)
761 (goto-char (point-max))
762 (walk-windows
763 (function
764 (lambda (window)
765 (when (and (eq (window-buffer window) current)
766 (or (eq scroll t) (eq scroll 'all)))
767 (select-window window)
768 (goto-char (point-max))
769 (select-window selected))))
770 nil t))))))
772 ;;; jww (1999-10-23): this needs testing
773 (defun eshell-postoutput-scroll-to-bottom ()
774 "Go to the end of buffer in all windows showing it.
775 Does not scroll if the current line is the last line in the buffer.
776 Depends on the value of `eshell-scroll-to-bottom-on-output' and
777 `eshell-scroll-show-maximum-output'.
779 This function should be in the list `eshell-output-filter-functions'."
780 (let* ((selected (selected-window))
781 (current (current-buffer))
782 (scroll eshell-scroll-to-bottom-on-output))
783 (unwind-protect
784 (walk-windows
785 (function
786 (lambda (window)
787 (if (eq (window-buffer window) current)
788 (progn
789 (select-window window)
790 (if (and (< (point) eshell-last-output-end)
791 (or (eq scroll t) (eq scroll 'all)
792 ;; Maybe user wants point to jump to end.
793 (and (eq scroll 'this)
794 (eq selected window))
795 (and (eq scroll 'others)
796 (not (eq selected window)))
797 ;; If point was at the end, keep it at end.
798 (>= (point) eshell-last-output-start)))
799 (goto-char eshell-last-output-end))
800 ;; Optionally scroll so that the text
801 ;; ends at the bottom of the window.
802 (if (and eshell-scroll-show-maximum-output
803 (>= (point) eshell-last-output-end))
804 (save-excursion
805 (goto-char (point-max))
806 (recenter -1)))
807 (select-window selected)))))
808 nil t)
809 (set-buffer current))))
811 (defun eshell-beginning-of-input ()
812 "Return the location of the start of the previous input."
813 eshell-last-input-start)
815 (defun eshell-beginning-of-output ()
816 "Return the location of the end of the previous output block."
817 eshell-last-input-end)
819 (defun eshell-end-of-output ()
820 "Return the location of the end of the previous output block."
821 (if (eshell-using-module 'eshell-prompt)
822 eshell-last-output-start
823 eshell-last-output-end))
825 (defun eshell-kill-output ()
826 "Kill all output from interpreter since last input.
827 Does not delete the prompt."
828 (interactive)
829 (save-excursion
830 (goto-char (eshell-beginning-of-output))
832 (delete-region (point) (eshell-end-of-output))))
834 (defun eshell-show-output (&optional arg)
835 "Display start of this batch of interpreter output at top of window.
836 Sets mark to the value of point when this command is run.
837 With a prefix argument, narrows region to last command output."
838 (interactive "P")
839 (goto-char (eshell-beginning-of-output))
840 (set-window-start (selected-window)
841 (save-excursion
842 (goto-char (eshell-beginning-of-input))
843 (line-beginning-position)))
844 (if arg
845 (narrow-to-region (eshell-beginning-of-output)
846 (eshell-end-of-output)))
847 (eshell-end-of-output))
849 (defun eshell-mark-output (&optional arg)
850 "Display start of this batch of interpreter output at top of window.
851 Sets mark to the value of point when this command is run.
852 With a prefix argument, narrows region to last command output."
853 (interactive "P")
854 (push-mark (eshell-show-output arg)))
856 (defun eshell-kill-input ()
857 "Kill all text from last stuff output by interpreter to point."
858 (interactive)
859 (if (> (point) eshell-last-output-end)
860 (kill-region eshell-last-output-end (point))
861 (let ((here (point)))
862 (eshell-bol)
863 (kill-region (point) here))))
865 (defun eshell-show-maximum-output (&optional interactive)
866 "Put the end of the buffer at the bottom of the window.
867 When run interactively, widen the buffer first."
868 (interactive "p")
869 (if interactive
870 (widen))
871 (goto-char (point-max))
872 (recenter -1))
874 (defun eshell-get-old-input (&optional use-current-region)
875 "Return the command input on the current line."
876 (if use-current-region
877 (buffer-substring (min (point) (mark))
878 (max (point) (mark)))
879 (save-excursion
880 (beginning-of-line)
881 (and eshell-skip-prompt-function
882 (funcall eshell-skip-prompt-function))
883 (let ((beg (point)))
884 (end-of-line)
885 (buffer-substring beg (point))))))
887 (defun eshell-copy-old-input ()
888 "Insert after prompt old input at point as new input to be edited."
889 (interactive)
890 (let ((input (eshell-get-old-input)))
891 (goto-char eshell-last-output-end)
892 (insert-and-inherit input)))
894 (defun eshell/exit ()
895 "Leave or kill the Eshell buffer, depending on `eshell-kill-on-exit'."
896 (throw 'eshell-terminal t))
898 (defun eshell-life-is-too-much ()
899 "Kill the current buffer (or bury it). Good-bye Eshell."
900 (interactive)
901 (if (not eshell-kill-on-exit)
902 (bury-buffer)
903 (kill-buffer (current-buffer))))
905 (defun eshell-truncate-buffer ()
906 "Truncate the buffer to `eshell-buffer-maximum-lines'.
907 This function could be on `eshell-output-filter-functions' or bound to
908 a key."
909 (interactive)
910 (save-excursion
911 (goto-char eshell-last-output-end)
912 (let ((lines (count-lines 1 (point)))
913 (inhibit-read-only t))
914 (forward-line (- eshell-buffer-maximum-lines))
915 (beginning-of-line)
916 (let ((pos (point)))
917 (if (bobp)
918 (if (called-interactively-p 'interactive)
919 (message "Buffer too short to truncate"))
920 (delete-region (point-min) (point))
921 (if (called-interactively-p 'interactive)
922 (message "Truncated buffer from %d to %d lines (%.1fk freed)"
923 lines eshell-buffer-maximum-lines
924 (/ pos 1024.0))))))))
926 (custom-add-option 'eshell-output-filter-functions
927 'eshell-truncate-buffer)
929 (defun eshell-send-invisible ()
930 "Read a string without echoing.
931 Then send it to the process running in the current buffer."
932 (interactive) ; Don't pass str as argument, to avoid snooping via C-x ESC ESC
933 (let ((str (read-passwd
934 (format "%s Password: "
935 (process-name (eshell-interactive-process))))))
936 (if (stringp str)
937 (process-send-string (eshell-interactive-process)
939 (message "Warning: text will be echoed"))))
941 (defun eshell-watch-for-password-prompt ()
942 "Prompt in the minibuffer for password and send without echoing.
943 This function uses `eshell-send-invisible' to read and send a password to the
944 buffer's process if STRING contains a password prompt defined by
945 `eshell-password-prompt-regexp'.
947 This function could be in the list `eshell-output-filter-functions'."
948 (when (eshell-interactive-process)
949 (save-excursion
950 (let ((case-fold-search t))
951 (goto-char eshell-last-output-block-begin)
952 (beginning-of-line)
953 (if (re-search-forward eshell-password-prompt-regexp
954 eshell-last-output-end t)
955 (eshell-send-invisible))))))
957 (custom-add-option 'eshell-output-filter-functions
958 'eshell-watch-for-password-prompt)
960 (defun eshell-handle-control-codes ()
961 "Act properly when certain control codes are seen."
962 (save-excursion
963 (goto-char eshell-last-output-block-begin)
964 (unless (eolp)
965 (beginning-of-line))
966 (while (< (point) eshell-last-output-end)
967 (let ((char (char-after)))
968 (cond
970 (if (< (1+ (point)) eshell-last-output-end)
971 (if (memq (char-after (1+ (point)))
973 (delete-char 1)
974 (let ((end (1+ (point))))
975 (beginning-of-line)
976 (delete-region (point) end)))
977 (add-text-properties (point) (1+ (point))
978 '(invisible t))
979 (forward-char)))
981 (delete-char 1)
982 (beep))
983 ((eq char ?\C-h)
984 (delete-region (1- (point)) (1+ (point))))
985 (t
986 (forward-char)))))))
988 (custom-add-option 'eshell-output-filter-functions
989 'eshell-handle-control-codes)
991 (autoload 'ansi-color-apply-on-region "ansi-color")
993 (defun eshell-handle-ansi-color ()
994 "Handle ANSI color codes."
995 (ansi-color-apply-on-region eshell-last-output-start
996 eshell-last-output-end))
998 (custom-add-option 'eshell-output-filter-functions
999 'eshell-handle-ansi-color)
1001 ;;; esh-mode.el ends here