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1 ;;; em-smart.el --- smart display of output
3 ;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004,
4 ;; 2005, 2006 Free Software Foundation, Inc.
6 ;; Author: John Wiegley <johnw@gnu.org>
8 ;; This file is part of GNU Emacs.
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.
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.
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
22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 ;; Boston, MA 02110-1301, USA.
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.
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."
37 ;; :link '(info-link "(eshell)Smart display of output")
40 ;;; Commentary:
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! ;)
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.
87 ;;; User Variables:
90 "*A list of functions to call when loading `eshell-smart'."
100 "*A hook that gets run when `eshell-smart' is unloaded."
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.
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.
114 that output can be presented in its entirely in the Eshell window."
118 not-even-short-output))
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."
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).
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.
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
152 "*This variable indicates where point should jump to after a command.
153 The options are `begin', `after' or `end'."
159 ;;; Internal Variables:
165 ;;; Functions:
168 "Setup Eshell smart display."
170 ;; override a few variables, since they would interfere with the
171 ;; smart display functionality.
196 "Scroll the given Eshell window accordingly."
205 "Refresh all visible Eshell buffers."
221 "Set the point to somewhere in the beginning of the last command."
239 "Disable smart display mode if the buffer changes in any way."
245 "Jump to the end of the input buffer.
246 This is done whenever a command exits successfully and both the command
247 and the end of the buffer are still visible."
258 "Display as much output as possible, smartly."
262 ;; trigger the redisplay now, so that we catch any attempted
263 ;; point motion; this is to cover for a redisplay bug
281 "Like `end-of-buffer', but do not push a mark."
286 "Handle self-inserting or movement commands intelligently."
297 eshell-current-command)
325 ;;; Code:
327 ;;; arch-tag: 8c0112c7-379c-4d54-9a1c-204d68786a4b
328 ;;; em-smart.el ends here