[bpt/emacs.git] / lisp / eshell / em-smart.el

;;; em-smart.el --- smart display of output

;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004,
;;   2005, 2006, 2007 Free Software Foundation, Inc.

;; Author: John Wiegley <johnw@gnu.org>

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

(provide 'em-smart)

(eval-when-compile (require 'esh-maint))

(defgroup eshell-smart nil
  "This module combines the facility of normal, modern shells with
some of the edit/review concepts inherent in the design of Plan 9's
9term.  See the docs for more details.

Most likely you will have to turn this option on and play around with
it to get a real sense of how it works."
  :tag "Smart display of output"
  ;; :link '(info-link "(eshell)Smart display of output")
  :group 'eshell-module)

;;; Commentary:

;; The best way to get a sense of what this code is trying to do is by
;; using it.  Basically, the philosophy represents a blend between the
;; ease of use of modern day shells, and the review-before-you-proceed
;; mentality of Plan 9's 9term.
;;
;; @ When you invoke a command, it is assumed that you want to read
;;   the output of that command.
;;
;; @ If the output is not what you wanted, it is assumed that you will
;;   want to edit, and then resubmit a refined version of that
;;   command.
;;
;; @ If the output is valid, pressing any self-inserting character key
;;   will jump to end of the buffer and insert that character, in
;;   order to begin entry of a new command.
;;
;; @ If you show an intention to edit the previous command -- by
;;   moving around within it -- then the next self-inserting
;;   characters will insert *there*, instead of at the bottom of the
;;   buffer.
;;
;; @ If you show an intention to review old commands, such as M-p or
;;   M-r, point will jump to the bottom of the buffer before invoking
;;   that command.
;;
;; @ If none of the above has happened yet (i.e., your point is just
;;   sitting on the previous command), you can use SPACE and BACKSPACE
;;   (or DELETE) to page forward and backward *through the output of
;;   the last command only*.  It will constrain the movement of the
;;   point and window so that the maximum amount of output is always
;;   displayed at all times.
;;
;; @ While output is being generated from a command, the window will
;;   be constantly reconfigured (until it would otherwise make no
;;   difference) in order to always show you the most output from the
;;   command possible.  This happens if you change window sizes,
;;   scroll, etc.
;;
;; @ Like I said, it's not really comprehensible until you try it! ;)
;;
;; One disadvantage of this module is that it increases Eshell's
;; memory consumption by a factor of two or more.  With small commands
;; (such as pwd), where the screen is mostly full, consumption can
;; increase by orders of magnitude.

;;; User Variables:

(defcustom eshell-smart-load-hook '(eshell-smart-initialize)
  "*A list of functions to call when loading `eshell-smart'."
  :type 'hook
  :group 'eshell-smart)

(defcustom eshell-smart-unload-hook
  (list
   (function
    (lambda ()
      (remove-hook 'window-configuration-change-hook
		   'eshell-refresh-windows))))
  "*A hook that gets run when `eshell-smart' is unloaded."
  :type 'hook
  :group 'eshell-smart)

(defcustom eshell-review-quick-commands nil
  "*If t, always review commands.
Reviewing means keeping point on the text of the command that was just
invoked, to allow corrections to be made easily.

If set to nil, quick commands won't be reviewed.  A quick command is a
command that produces no output, and exits successfully.

If set to `not-even-short-output', then the definition of \"quick
command\" is extended to include commands that produce output, iff
that output can be presented in its entirely in the Eshell window."
  :type '(choice (const :tag "No" nil)
		 (const :tag "Yes" t)
		 (const :tag "Not even short output"
			not-even-short-output))
  :group 'eshell-smart)

(defcustom eshell-smart-display-navigate-list
  '(insert-parentheses
    mouse-yank-at-click
    mouse-yank-secondary
    yank-pop
    yank-rectangle
    yank)
  "*A list of commands which cause Eshell to jump to the end of buffer."
  :type '(repeat function)
  :group 'eshell-smart)

(defcustom eshell-smart-space-goes-to-end t
  "*If non-nil, space will go to end of buffer when point-max is visible.
That is, if a command is running and the user presses SPACE at a time
when the end of the buffer is visible, point will go to the end of the
buffer and smart-display will be turned off (that is, subsequently
pressing backspace will not cause the buffer to scroll down).

This feature is provided to make it very easy to watch the output of a
long-running command, such as make, where it's more desirable to see
the output go by than to review it afterward.

Setting this variable to nil means that space and backspace will
always have a consistent behavior, which is to move back and forth
through displayed output.  But it also means that enabling output
tracking requires the user to manually move point to the end of the
buffer using \\[end-of-buffer]."
  :type 'boolean
  :group 'eshell-smart)

(defcustom eshell-where-to-jump 'begin
  "*This variable indicates where point should jump to after a command.
The options are `begin', `after' or `end'."
  :type '(radio (const :tag "Beginning of command" begin)
		(const :tag "After command word" after)
		(const :tag "End of command" end))
  :group 'eshell-smart)

;;; Internal Variables:

(defvar eshell-smart-displayed nil)
(defvar eshell-smart-command-done nil)
(defvar eshell-currently-handling-window nil)

;;; Functions:

(defun eshell-smart-initialize ()
  "Setup Eshell smart display."
  (unless eshell-non-interactive-p
    ;; override a few variables, since they would interfere with the
    ;; smart display functionality.
    (set (make-local-variable 'eshell-scroll-to-bottom-on-output) nil)
    (set (make-local-variable 'eshell-scroll-to-bottom-on-input) nil)
    (set (make-local-variable 'eshell-scroll-show-maximum-output) t)

    (add-hook 'window-scroll-functions 'eshell-smart-scroll-window nil t)
    (add-hook 'window-configuration-change-hook 'eshell-refresh-windows)

    (add-hook 'eshell-output-filter-functions 'eshell-refresh-windows t t)

    (add-hook 'after-change-functions 'eshell-disable-after-change nil t)

    (add-hook 'eshell-input-filter-functions 'eshell-smart-display-setup nil t)

    (make-local-variable 'eshell-smart-command-done)
    (add-hook 'eshell-post-command-hook
	      (function
	       (lambda ()
		 (setq eshell-smart-command-done t))) t t)

    (unless (eq eshell-review-quick-commands t)
      (add-hook 'eshell-post-command-hook
		'eshell-smart-maybe-jump-to-end nil t))))

(defun eshell-smart-scroll-window (wind start)
  "Scroll the given Eshell window accordingly."
  (unless eshell-currently-handling-window
    (let ((inhibit-point-motion-hooks t)
	  (eshell-currently-handling-window t))
      (save-selected-window
	(select-window wind)
	(eshell-smart-redisplay)))))

(defun eshell-refresh-windows (&optional frame)
  "Refresh all visible Eshell buffers."
  (let (affected)
    (walk-windows
     (function
      (lambda (wind)
	(with-current-buffer (window-buffer wind)
	  (if eshell-mode
	      (let (window-scroll-functions)
		(eshell-smart-scroll-window wind (window-start))
		(setq affected t))))))
     0 frame)
    (if affected
	(let (window-scroll-functions)
	  (eshell-redisplay)))))

(defun eshell-smart-display-setup ()
  "Set the point to somewhere in the beginning of the last command."
  (cond
   ((eq eshell-where-to-jump 'begin)
    (goto-char eshell-last-input-start))
   ((eq eshell-where-to-jump 'after)
    (goto-char (next-single-property-change
		eshell-last-input-start 'arg-end))
    (if (= (point) (- eshell-last-input-end 2))
	(forward-char)))
   ((eq eshell-where-to-jump 'end)
    (goto-char (1- eshell-last-input-end)))
   (t
    (error "Invalid value for `eshell-where-to-jump'")))
  (setq eshell-smart-command-done nil)
  (add-hook 'pre-command-hook 'eshell-smart-display-move nil t)
  (eshell-refresh-windows))

(defun eshell-disable-after-change (b e l)
  "Disable smart display mode if the buffer changes in any way."
  (when eshell-smart-command-done
    (remove-hook 'pre-command-hook 'eshell-smart-display-move t)
    (setq eshell-smart-command-done nil)))

(defun eshell-smart-maybe-jump-to-end ()
  "Jump to the end of the input buffer.
This is done whenever a command exits successfully and both the command
and the end of the buffer are still visible."
  (when (and (= eshell-last-command-status 0)
	     (if (eq eshell-review-quick-commands 'not-even-short-output)
		 (and (pos-visible-in-window-p (point-max))
		      (pos-visible-in-window-p eshell-last-input-start))
	       (= (count-lines eshell-last-input-end
			       eshell-last-output-end) 0)))
    (goto-char (point-max))
    (remove-hook 'pre-command-hook 'eshell-smart-display-move t)))

(defun eshell-smart-redisplay ()
  "Display as much output as possible, smartly."
  (if (eobp)
      (save-excursion
	(recenter -1)
	;; trigger the redisplay now, so that we catch any attempted
	;; point motion; this is to cover for a redisplay bug
	(eshell-redisplay))
    (let ((top-point (point)))
      (and (memq 'eshell-smart-display-move pre-command-hook)
	   (>= (point) eshell-last-input-start)
	   (< (point) eshell-last-input-end)
	   (set-window-start (selected-window)
			     (line-beginning-position) t))
      (if (pos-visible-in-window-p (point-max))
	  (save-excursion
	    (goto-char (point-max))
	    (recenter -1)
	    (unless (pos-visible-in-window-p top-point)
	      (goto-char top-point)
	      (set-window-start (selected-window)
				(line-beginning-position) t)))))))

(defun eshell-smart-goto-end ()
  "Like `end-of-buffer', but do not push a mark."
  (interactive)
  (goto-char (point-max)))

(defun eshell-smart-display-move ()
  "Handle self-inserting or movement commands intelligently."
  (let (clear)
    (if (or current-prefix-arg
	    (and (> (point) eshell-last-input-start)
		 (< (point) eshell-last-input-end))
	    (>= (point) eshell-last-output-end))
	(setq clear t)
      (cond
       ((eq this-command 'self-insert-command)
	(if (eq last-command-char ? )
	    (if (and eshell-smart-space-goes-to-end
		     eshell-current-command)
		(if (not (pos-visible-in-window-p (point-max)))
		    (setq this-command 'scroll-up)
		  (setq this-command 'eshell-smart-goto-end))
	      (setq this-command 'scroll-up))
	  (setq clear t)
	  (goto-char (point-max))))
       ((eq this-command 'delete-backward-char)
	(setq this-command 'ignore)
	(if (< (point) eshell-last-input-start)
	    (eshell-show-output)
	  (if (pos-visible-in-window-p eshell-last-input-start)
	      (progn
		(ignore-errors
		  (scroll-down))
		(eshell-show-output))
	    (scroll-down)
	    (if (pos-visible-in-window-p eshell-last-input-end)
		(eshell-show-output)))))
       ((or (memq this-command eshell-smart-display-navigate-list)
	    (and (eq this-command 'eshell-send-input)
		 (not (and (>= (point) eshell-last-input-start)
			   (< (point) eshell-last-input-end)))))
	(setq clear t)
	(goto-char (point-max)))))
    (if clear
	(remove-hook 'pre-command-hook 'eshell-smart-display-move t))))

;;; Code:

;;; arch-tag: 8c0112c7-379c-4d54-9a1c-204d68786a4b
;;; em-smart.el ends here
Commit	Line	Data
60370d40	1	;;; em-smart.el --- smart display of output
affbf647	2
f2e3589a	3	;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004,
f0fa15c5	4	;; 2005, 2006, 2007 Free Software Foundation, Inc.
affbf647	5
7de5b421 GM	6	;; Author: John Wiegley <johnw@gnu.org>
7de5b421 GM	7
affbf647 GM	8	;; This file is part of GNU Emacs.
	9
	10	;; GNU Emacs is free software; you can redistribute it and/or modify
	11	;; it under the terms of the GNU General Public License as published by
	12	;; the Free Software Foundation; either version 2, or (at your option)
	13	;; any later version.
	14
	15	;; GNU Emacs is distributed in the hope that it will be useful,
	16	;; but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	;; GNU General Public License for more details.
	19
	20	;; You should have received a copy of the GNU General Public License
	21	;; along with GNU Emacs; see the file COPYING. If not, write to the
3a35cf56 LK	22	;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
3a35cf56 LK	23	;; Boston, MA 02110-1301, USA.
affbf647 GM	24
	25	(provide 'em-smart)
	26
	27	(eval-when-compile (require 'esh-maint))
	28
	29	(defgroup eshell-smart nil
	30	"This module combines the facility of normal, modern shells with
	31	some of the edit/review concepts inherent in the design of Plan 9's
	32	9term. See the docs for more details.
	33
	34	Most likely you will have to turn this option on and play around with
	35	it to get a real sense of how it works."
	36	:tag "Smart display of output"
c6bf6cdc	37	;; :link '(info-link "(eshell)Smart display of output")
affbf647 GM	38	:group 'eshell-module)
	39
	40	;;; Commentary:
	41
	42	;; The best way to get a sense of what this code is trying to do is by
	43	;; using it. Basically, the philosophy represents a blend between the
	44	;; ease of use of modern day shells, and the review-before-you-proceed
	45	;; mentality of Plan 9's 9term.
	46	;;
	47	;; @ When you invoke a command, it is assumed that you want to read
	48	;; the output of that command.
	49	;;
	50	;; @ If the output is not what you wanted, it is assumed that you will
	51	;; want to edit, and then resubmit a refined version of that
	52	;; command.
	53	;;
	54	;; @ If the output is valid, pressing any self-inserting character key
	55	;; will jump to end of the buffer and insert that character, in
	56	;; order to begin entry of a new command.
	57	;;
	58	;; @ If you show an intention to edit the previous command -- by
	59	;; moving around within it -- then the next self-inserting
	60	;; characters will insert there, instead of at the bottom of the
	61	;; buffer.
	62	;;
	63	;; @ If you show an intention to review old commands, such as M-p or
	64	;; M-r, point will jump to the bottom of the buffer before invoking
	65	;; that command.
	66	;;
	67	;; @ If none of the above has happened yet (i.e., your point is just
	68	;; sitting on the previous command), you can use SPACE and BACKSPACE
	69	;; (or DELETE) to page forward and backward *through the output of
	70	;; the last command only*. It will constrain the movement of the
	71	;; point and window so that the maximum amount of output is always
	72	;; displayed at all times.
	73	;;
	74	;; @ While output is being generated from a command, the window will
	75	;; be constantly reconfigured (until it would otherwise make no
	76	;; difference) in order to always show you the most output from the
	77	;; command possible. This happens if you change window sizes,
	78	;; scroll, etc.
	79	;;
	80	;; @ Like I said, it's not really comprehensible until you try it! ;)
dace60cf JW	81	;;
	82	;; One disadvantage of this module is that it increases Eshell's
	83	;; memory consumption by a factor of two or more. With small commands
	84	;; (such as pwd), where the screen is mostly full, consumption can
	85	;; increase by orders of magnitude.
affbf647 GM	86
	87	;;; User Variables:
	88
	89	(defcustom eshell-smart-load-hook '(eshell-smart-initialize)
	90	"*A list of functions to call when loading `eshell-smart'."
	91	:type 'hook
	92	:group 'eshell-smart)
	93
	94	(defcustom eshell-smart-unload-hook
	95	(list
	96	(function
	97	(lambda ()
	98	(remove-hook 'window-configuration-change-hook
	99	'eshell-refresh-windows))))
	100	"*A hook that gets run when `eshell-smart' is unloaded."
	101	:type 'hook
	102	:group 'eshell-smart)
	103
	104	(defcustom eshell-review-quick-commands nil
b4bd214e JW	105	"*If t, always review commands.
	106	Reviewing means keeping point on the text of the command that was just
	107	invoked, to allow corrections to be made easily.
	108
	109	If set to nil, quick commands won't be reviewed. A quick command is a
	110	command that produces no output, and exits successfully.
	111
	112	If set to `not-even-short-output', then the definition of \"quick
	113	command\" is extended to include commands that produce output, iff
	114	that output can be presented in its entirely in the Eshell window."
	115	:type '(choice (const :tag "No" nil)
	116	(const :tag "Yes" t)
	117	(const :tag "Not even short output"
	118	not-even-short-output))
affbf647 GM	119	:group 'eshell-smart)
	120
	121	(defcustom eshell-smart-display-navigate-list
	122	'(insert-parentheses
	123	mouse-yank-at-click
	124	mouse-yank-secondary
	125	yank-pop
	126	yank-rectangle
	127	yank)
	128	"*A list of commands which cause Eshell to jump to the end of buffer."
	129	:type '(repeat function)
	130	:group 'eshell-smart)
	131
	132	(defcustom eshell-smart-space-goes-to-end t
	133	"*If non-nil, space will go to end of buffer when point-max is visible.
	134	That is, if a command is running and the user presses SPACE at a time
	135	when the end of the buffer is visible, point will go to the end of the
	136	buffer and smart-display will be turned off (that is, subsequently
	137	pressing backspace will not cause the buffer to scroll down).
	138
	139	This feature is provided to make it very easy to watch the output of a
	140	long-running command, such as make, where it's more desirable to see
	141	the output go by than to review it afterward.
	142
	143	Setting this variable to nil means that space and backspace will
	144	always have a consistent behavior, which is to move back and forth
	145	through displayed output. But it also means that enabling output
	146	tracking requires the user to manually move point to the end of the
	147	buffer using \\[end-of-buffer]."
	148	:type 'boolean
	149	:group 'eshell-smart)
	150
	151	(defcustom eshell-where-to-jump 'begin
	152	"*This variable indicates where point should jump to after a command.
	153	The options are `begin', `after' or `end'."
	154	:type '(radio (const :tag "Beginning of command" begin)
	155	(const :tag "After command word" after)
	156	(const :tag "End of command" end))
	157	:group 'eshell-smart)
	158
	159	;;; Internal Variables:
	160
	161	(defvar eshell-smart-displayed nil)
	162	(defvar eshell-smart-command-done nil)
dace60cf	163	(defvar eshell-currently-handling-window nil)
affbf647 GM	164
	165	;;; Functions:
	166
	167	(defun eshell-smart-initialize ()
	168	"Setup Eshell smart display."
	169	(unless eshell-non-interactive-p
	170	;; override a few variables, since they would interfere with the
	171	;; smart display functionality.
	172	(set (make-local-variable 'eshell-scroll-to-bottom-on-output) nil)
	173	(set (make-local-variable 'eshell-scroll-to-bottom-on-input) nil)
	174	(set (make-local-variable 'eshell-scroll-show-maximum-output) t)
	175
affbf647 GM	176	(add-hook 'window-scroll-functions 'eshell-smart-scroll-window nil t)
	177	(add-hook 'window-configuration-change-hook 'eshell-refresh-windows)
	178
affbf647 GM	179	(add-hook 'eshell-output-filter-functions 'eshell-refresh-windows t t)
affbf647 GM	180
dace60cf	181	(add-hook 'after-change-functions 'eshell-disable-after-change nil t)
affbf647	182
dace60cf	183	(add-hook 'eshell-input-filter-functions 'eshell-smart-display-setup nil t)
affbf647 GM	184
affbf647 GM	185	(make-local-variable 'eshell-smart-command-done)
dace60cf JW	186	(add-hook 'eshell-post-command-hook
	187	(function
	188	(lambda ()
	189	(setq eshell-smart-command-done t))) t t)
affbf647	190
b4bd214e	191	(unless (eq eshell-review-quick-commands t)
affbf647 GM	192	(add-hook 'eshell-post-command-hook
	193	'eshell-smart-maybe-jump-to-end nil t))))
	194
	195	(defun eshell-smart-scroll-window (wind start)
	196	"Scroll the given Eshell window accordingly."
	197	(unless eshell-currently-handling-window
	198	(let ((inhibit-point-motion-hooks t)
	199	(eshell-currently-handling-window t))
dace60cf JW	200	(save-selected-window
	201	(select-window wind)
	202	(eshell-smart-redisplay)))))
affbf647 GM	203
	204	(defun eshell-refresh-windows (&optional frame)
	205	"Refresh all visible Eshell buffers."
	206	(let (affected)
	207	(walk-windows
	208	(function
	209	(lambda (wind)
	210	(with-current-buffer (window-buffer wind)
dace60cf JW	211	(if eshell-mode
	212	(let (window-scroll-functions)
	213	(eshell-smart-scroll-window wind (window-start))
	214	(setq affected t))))))
affbf647 GM	215	0 frame)
	216	(if affected
	217	(let (window-scroll-functions)
	218	(eshell-redisplay)))))
	219
	220	(defun eshell-smart-display-setup ()
	221	"Set the point to somewhere in the beginning of the last command."
	222	(cond
	223	((eq eshell-where-to-jump 'begin)
	224	(goto-char eshell-last-input-start))
	225	((eq eshell-where-to-jump 'after)
	226	(goto-char (next-single-property-change
	227	eshell-last-input-start 'arg-end))
	228	(if (= (point) (- eshell-last-input-end 2))
	229	(forward-char)))
	230	((eq eshell-where-to-jump 'end)
	231	(goto-char (1- eshell-last-input-end)))
	232	(t
	233	(error "Invalid value for `eshell-where-to-jump'")))
	234	(setq eshell-smart-command-done nil)
	235	(add-hook 'pre-command-hook 'eshell-smart-display-move nil t)
	236	(eshell-refresh-windows))
	237
	238	(defun eshell-disable-after-change (b e l)
	239	"Disable smart display mode if the buffer changes in any way."
	240	(when eshell-smart-command-done
	241	(remove-hook 'pre-command-hook 'eshell-smart-display-move t)
	242	(setq eshell-smart-command-done nil)))
	243
	244	(defun eshell-smart-maybe-jump-to-end ()
	245	"Jump to the end of the input buffer.
45a87863	246	This is done whenever a command exits successfully and both the command
b4bd214e	247	and the end of the buffer are still visible."
affbf647	248	(when (and (= eshell-last-command-status 0)
b4bd214e JW	249	(if (eq eshell-review-quick-commands 'not-even-short-output)
	250	(and (pos-visible-in-window-p (point-max))
	251	(pos-visible-in-window-p eshell-last-input-start))
	252	(= (count-lines eshell-last-input-end
	253	eshell-last-output-end) 0)))
affbf647 GM	254	(goto-char (point-max))
	255	(remove-hook 'pre-command-hook 'eshell-smart-display-move t)))
	256
	257	(defun eshell-smart-redisplay ()
	258	"Display as much output as possible, smartly."
	259	(if (eobp)
157975e3 JW	260	(save-excursion
	261	(recenter -1)
	262	;; trigger the redisplay now, so that we catch any attempted
	263	;; point motion; this is to cover for a redisplay bug
	264	(eshell-redisplay))
ca7aae91 JW	265	(let ((top-point (point)))
	266	(and (memq 'eshell-smart-display-move pre-command-hook)
	267	(>= (point) eshell-last-input-start)
	268	(< (point) eshell-last-input-end)
	269	(set-window-start (selected-window)
	270	(line-beginning-position) t))
	271	(if (pos-visible-in-window-p (point-max))
	272	(save-excursion
	273	(goto-char (point-max))
	274	(recenter -1)
	275	(unless (pos-visible-in-window-p top-point)
	276	(goto-char top-point)
	277	(set-window-start (selected-window)
	278	(line-beginning-position) t)))))))
affbf647 GM	279
	280	(defun eshell-smart-goto-end ()
	281	"Like `end-of-buffer', but do not push a mark."
	282	(interactive)
	283	(goto-char (point-max)))
	284
	285	(defun eshell-smart-display-move ()
	286	"Handle self-inserting or movement commands intelligently."
	287	(let (clear)
	288	(if (or current-prefix-arg
	289	(and (> (point) eshell-last-input-start)
	290	(< (point) eshell-last-input-end))
	291	(>= (point) eshell-last-output-end))
	292	(setq clear t)
	293	(cond
	294	((eq this-command 'self-insert-command)
	295	(if (eq last-command-char ? )
	296	(if (and eshell-smart-space-goes-to-end
	297	eshell-current-command)
	298	(if (not (pos-visible-in-window-p (point-max)))
	299	(setq this-command 'scroll-up)
	300	(setq this-command 'eshell-smart-goto-end))
	301	(setq this-command 'scroll-up))
	302	(setq clear t)
	303	(goto-char (point-max))))
	304	((eq this-command 'delete-backward-char)
	305	(setq this-command 'ignore)
	306	(if (< (point) eshell-last-input-start)
	307	(eshell-show-output)
	308	(if (pos-visible-in-window-p eshell-last-input-start)
	309	(progn
	310	(ignore-errors
	311	(scroll-down))
	312	(eshell-show-output))
	313	(scroll-down)
	314	(if (pos-visible-in-window-p eshell-last-input-end)
	315	(eshell-show-output)))))
	316	((or (memq this-command eshell-smart-display-navigate-list)
	317	(and (eq this-command 'eshell-send-input)
	318	(not (and (>= (point) eshell-last-input-start)
	319	(< (point) eshell-last-input-end)))))
	320	(setq clear t)
	321	(goto-char (point-max)))))
	322	(if clear
	323	(remove-hook 'pre-command-hook 'eshell-smart-display-move t))))
	324
	325	;;; Code:
	326
ab5796a9	327	;;; arch-tag: 8c0112c7-379c-4d54-9a1c-204d68786a4b
affbf647	328	;;; em-smart.el ends here