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affbf647 GM |
1 | ;;; em-smart --- smart display of output |
2 | ||
faadfb0a | 3 | ;; Copyright (C) 1999, 2000 Free Software Foundation |
affbf647 | 4 | |
7de5b421 GM |
5 | ;; Author: John Wiegley <johnw@gnu.org> |
6 | ||
affbf647 GM |
7 | ;; This file is part of GNU Emacs. |
8 | ||
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 2, or (at your option) | |
12 | ;; any later version. | |
13 | ||
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. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
21 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | ;; Boston, MA 02111-1307, USA. | |
23 | ||
24 | (provide 'em-smart) | |
25 | ||
26 | (eval-when-compile (require 'esh-maint)) | |
27 | ||
28 | (defgroup eshell-smart nil | |
29 | "This module combines the facility of normal, modern shells with | |
30 | some of the edit/review concepts inherent in the design of Plan 9's | |
31 | 9term. See the docs for more details. | |
32 | ||
33 | Most likely you will have to turn this option on and play around with | |
34 | it to get a real sense of how it works." | |
35 | :tag "Smart display of output" | |
c3bc30c8 | 36 | :link '(info-link "(eshell)Smart display of output") |
affbf647 GM |
37 | :group 'eshell-module) |
38 | ||
39 | ;;; Commentary: | |
40 | ||
41 | ;; The best way to get a sense of what this code is trying to do is by | |
42 | ;; using it. Basically, the philosophy represents a blend between the | |
43 | ;; ease of use of modern day shells, and the review-before-you-proceed | |
44 | ;; mentality of Plan 9's 9term. | |
45 | ;; | |
46 | ;; @ When you invoke a command, it is assumed that you want to read | |
47 | ;; the output of that command. | |
48 | ;; | |
49 | ;; @ If the output is not what you wanted, it is assumed that you will | |
50 | ;; want to edit, and then resubmit a refined version of that | |
51 | ;; command. | |
52 | ;; | |
53 | ;; @ If the output is valid, pressing any self-inserting character key | |
54 | ;; will jump to end of the buffer and insert that character, in | |
55 | ;; order to begin entry of a new command. | |
56 | ;; | |
57 | ;; @ If you show an intention to edit the previous command -- by | |
58 | ;; moving around within it -- then the next self-inserting | |
59 | ;; characters will insert *there*, instead of at the bottom of the | |
60 | ;; buffer. | |
61 | ;; | |
62 | ;; @ If you show an intention to review old commands, such as M-p or | |
63 | ;; M-r, point will jump to the bottom of the buffer before invoking | |
64 | ;; that command. | |
65 | ;; | |
66 | ;; @ If none of the above has happened yet (i.e., your point is just | |
67 | ;; sitting on the previous command), you can use SPACE and BACKSPACE | |
68 | ;; (or DELETE) to page forward and backward *through the output of | |
69 | ;; the last command only*. It will constrain the movement of the | |
70 | ;; point and window so that the maximum amount of output is always | |
71 | ;; displayed at all times. | |
72 | ;; | |
73 | ;; @ While output is being generated from a command, the window will | |
74 | ;; be constantly reconfigured (until it would otherwise make no | |
75 | ;; difference) in order to always show you the most output from the | |
76 | ;; command possible. This happens if you change window sizes, | |
77 | ;; scroll, etc. | |
78 | ;; | |
79 | ;; @ Like I said, it's not really comprehensible until you try it! ;) | |
dace60cf JW |
80 | ;; |
81 | ;; One disadvantage of this module is that it increases Eshell's | |
82 | ;; memory consumption by a factor of two or more. With small commands | |
83 | ;; (such as pwd), where the screen is mostly full, consumption can | |
84 | ;; increase by orders of magnitude. | |
affbf647 GM |
85 | |
86 | ;;; User Variables: | |
87 | ||
88 | (defcustom eshell-smart-load-hook '(eshell-smart-initialize) | |
89 | "*A list of functions to call when loading `eshell-smart'." | |
90 | :type 'hook | |
91 | :group 'eshell-smart) | |
92 | ||
93 | (defcustom eshell-smart-unload-hook | |
94 | (list | |
95 | (function | |
96 | (lambda () | |
97 | (remove-hook 'window-configuration-change-hook | |
98 | 'eshell-refresh-windows)))) | |
99 | "*A hook that gets run when `eshell-smart' is unloaded." | |
100 | :type 'hook | |
101 | :group 'eshell-smart) | |
102 | ||
103 | (defcustom eshell-review-quick-commands nil | |
b4bd214e JW |
104 | "*If t, always review commands. |
105 | Reviewing means keeping point on the text of the command that was just | |
106 | invoked, to allow corrections to be made easily. | |
107 | ||
108 | If set to nil, quick commands won't be reviewed. A quick command is a | |
109 | command that produces no output, and exits successfully. | |
110 | ||
111 | If set to `not-even-short-output', then the definition of \"quick | |
112 | command\" is extended to include commands that produce output, iff | |
113 | that output can be presented in its entirely in the Eshell window." | |
114 | :type '(choice (const :tag "No" nil) | |
115 | (const :tag "Yes" t) | |
116 | (const :tag "Not even short output" | |
117 | not-even-short-output)) | |
affbf647 GM |
118 | :group 'eshell-smart) |
119 | ||
120 | (defcustom eshell-smart-display-navigate-list | |
121 | '(insert-parentheses | |
122 | mouse-yank-at-click | |
123 | mouse-yank-secondary | |
124 | yank-pop | |
125 | yank-rectangle | |
126 | yank) | |
127 | "*A list of commands which cause Eshell to jump to the end of buffer." | |
128 | :type '(repeat function) | |
129 | :group 'eshell-smart) | |
130 | ||
131 | (defcustom eshell-smart-space-goes-to-end t | |
132 | "*If non-nil, space will go to end of buffer when point-max is visible. | |
133 | That is, if a command is running and the user presses SPACE at a time | |
134 | when the end of the buffer is visible, point will go to the end of the | |
135 | buffer and smart-display will be turned off (that is, subsequently | |
136 | pressing backspace will not cause the buffer to scroll down). | |
137 | ||
138 | This feature is provided to make it very easy to watch the output of a | |
139 | long-running command, such as make, where it's more desirable to see | |
140 | the output go by than to review it afterward. | |
141 | ||
142 | Setting this variable to nil means that space and backspace will | |
143 | always have a consistent behavior, which is to move back and forth | |
144 | through displayed output. But it also means that enabling output | |
145 | tracking requires the user to manually move point to the end of the | |
146 | buffer using \\[end-of-buffer]." | |
147 | :type 'boolean | |
148 | :group 'eshell-smart) | |
149 | ||
150 | (defcustom eshell-where-to-jump 'begin | |
151 | "*This variable indicates where point should jump to after a command. | |
152 | The options are `begin', `after' or `end'." | |
153 | :type '(radio (const :tag "Beginning of command" begin) | |
154 | (const :tag "After command word" after) | |
155 | (const :tag "End of command" end)) | |
156 | :group 'eshell-smart) | |
157 | ||
158 | ;;; Internal Variables: | |
159 | ||
160 | (defvar eshell-smart-displayed nil) | |
161 | (defvar eshell-smart-command-done nil) | |
dace60cf | 162 | (defvar eshell-currently-handling-window nil) |
affbf647 GM |
163 | |
164 | ;;; Functions: | |
165 | ||
166 | (defun eshell-smart-initialize () | |
167 | "Setup Eshell smart display." | |
168 | (unless eshell-non-interactive-p | |
169 | ;; override a few variables, since they would interfere with the | |
170 | ;; smart display functionality. | |
171 | (set (make-local-variable 'eshell-scroll-to-bottom-on-output) nil) | |
172 | (set (make-local-variable 'eshell-scroll-to-bottom-on-input) nil) | |
173 | (set (make-local-variable 'eshell-scroll-show-maximum-output) t) | |
174 | ||
175 | (make-local-hook 'window-scroll-functions) | |
176 | (add-hook 'window-scroll-functions 'eshell-smart-scroll-window nil t) | |
177 | (add-hook 'window-configuration-change-hook 'eshell-refresh-windows) | |
178 | ||
179 | (make-local-hook 'eshell-output-filter-functions) | |
180 | (add-hook 'eshell-output-filter-functions 'eshell-refresh-windows t t) | |
181 | ||
182 | (make-local-hook 'pre-command-hook) | |
183 | (make-local-hook 'after-change-functions) | |
dace60cf | 184 | (add-hook 'after-change-functions 'eshell-disable-after-change nil t) |
affbf647 GM |
185 | |
186 | (make-local-hook 'eshell-input-filter-functions) | |
dace60cf | 187 | (add-hook 'eshell-input-filter-functions 'eshell-smart-display-setup nil t) |
affbf647 GM |
188 | |
189 | (make-local-variable 'eshell-smart-command-done) | |
190 | (make-local-hook 'eshell-post-command-hook) | |
dace60cf JW |
191 | (add-hook 'eshell-post-command-hook |
192 | (function | |
193 | (lambda () | |
194 | (setq eshell-smart-command-done t))) t t) | |
affbf647 | 195 | |
b4bd214e | 196 | (unless (eq eshell-review-quick-commands t) |
affbf647 GM |
197 | (add-hook 'eshell-post-command-hook |
198 | 'eshell-smart-maybe-jump-to-end nil t)))) | |
199 | ||
200 | (defun eshell-smart-scroll-window (wind start) | |
201 | "Scroll the given Eshell window accordingly." | |
202 | (unless eshell-currently-handling-window | |
203 | (let ((inhibit-point-motion-hooks t) | |
204 | (eshell-currently-handling-window t)) | |
dace60cf JW |
205 | (save-selected-window |
206 | (select-window wind) | |
207 | (eshell-smart-redisplay))))) | |
affbf647 GM |
208 | |
209 | (defun eshell-refresh-windows (&optional frame) | |
210 | "Refresh all visible Eshell buffers." | |
211 | (let (affected) | |
212 | (walk-windows | |
213 | (function | |
214 | (lambda (wind) | |
215 | (with-current-buffer (window-buffer wind) | |
dace60cf JW |
216 | (if eshell-mode |
217 | (let (window-scroll-functions) | |
218 | (eshell-smart-scroll-window wind (window-start)) | |
219 | (setq affected t)))))) | |
affbf647 GM |
220 | 0 frame) |
221 | (if affected | |
222 | (let (window-scroll-functions) | |
223 | (eshell-redisplay))))) | |
224 | ||
225 | (defun eshell-smart-display-setup () | |
226 | "Set the point to somewhere in the beginning of the last command." | |
227 | (cond | |
228 | ((eq eshell-where-to-jump 'begin) | |
229 | (goto-char eshell-last-input-start)) | |
230 | ((eq eshell-where-to-jump 'after) | |
231 | (goto-char (next-single-property-change | |
232 | eshell-last-input-start 'arg-end)) | |
233 | (if (= (point) (- eshell-last-input-end 2)) | |
234 | (forward-char))) | |
235 | ((eq eshell-where-to-jump 'end) | |
236 | (goto-char (1- eshell-last-input-end))) | |
237 | (t | |
238 | (error "Invalid value for `eshell-where-to-jump'"))) | |
239 | (setq eshell-smart-command-done nil) | |
240 | (add-hook 'pre-command-hook 'eshell-smart-display-move nil t) | |
241 | (eshell-refresh-windows)) | |
242 | ||
243 | (defun eshell-disable-after-change (b e l) | |
244 | "Disable smart display mode if the buffer changes in any way." | |
245 | (when eshell-smart-command-done | |
246 | (remove-hook 'pre-command-hook 'eshell-smart-display-move t) | |
247 | (setq eshell-smart-command-done nil))) | |
248 | ||
249 | (defun eshell-smart-maybe-jump-to-end () | |
250 | "Jump to the end of the input buffer. | |
b4bd214e JW |
251 | This is done whenever a command exits sucessfully and both the command |
252 | and the end of the buffer are still visible." | |
affbf647 | 253 | (when (and (= eshell-last-command-status 0) |
b4bd214e JW |
254 | (if (eq eshell-review-quick-commands 'not-even-short-output) |
255 | (and (pos-visible-in-window-p (point-max)) | |
256 | (pos-visible-in-window-p eshell-last-input-start)) | |
257 | (= (count-lines eshell-last-input-end | |
258 | eshell-last-output-end) 0))) | |
affbf647 GM |
259 | (goto-char (point-max)) |
260 | (remove-hook 'pre-command-hook 'eshell-smart-display-move t))) | |
261 | ||
262 | (defun eshell-smart-redisplay () | |
263 | "Display as much output as possible, smartly." | |
264 | (if (eobp) | |
265 | (recenter -1) | |
ca7aae91 JW |
266 | (let ((top-point (point))) |
267 | (and (memq 'eshell-smart-display-move pre-command-hook) | |
268 | (>= (point) eshell-last-input-start) | |
269 | (< (point) eshell-last-input-end) | |
270 | (set-window-start (selected-window) | |
271 | (line-beginning-position) t)) | |
272 | (if (pos-visible-in-window-p (point-max)) | |
273 | (save-excursion | |
274 | (goto-char (point-max)) | |
275 | (recenter -1) | |
276 | (unless (pos-visible-in-window-p top-point) | |
277 | (goto-char top-point) | |
278 | (set-window-start (selected-window) | |
279 | (line-beginning-position) t))))))) | |
affbf647 GM |
280 | |
281 | (defun eshell-smart-goto-end () | |
282 | "Like `end-of-buffer', but do not push a mark." | |
283 | (interactive) | |
284 | (goto-char (point-max))) | |
285 | ||
286 | (defun eshell-smart-display-move () | |
287 | "Handle self-inserting or movement commands intelligently." | |
288 | (let (clear) | |
289 | (if (or current-prefix-arg | |
290 | (and (> (point) eshell-last-input-start) | |
291 | (< (point) eshell-last-input-end)) | |
292 | (>= (point) eshell-last-output-end)) | |
293 | (setq clear t) | |
294 | (cond | |
295 | ((eq this-command 'self-insert-command) | |
296 | (if (eq last-command-char ? ) | |
297 | (if (and eshell-smart-space-goes-to-end | |
298 | eshell-current-command) | |
299 | (if (not (pos-visible-in-window-p (point-max))) | |
300 | (setq this-command 'scroll-up) | |
301 | (setq this-command 'eshell-smart-goto-end)) | |
302 | (setq this-command 'scroll-up)) | |
303 | (setq clear t) | |
304 | (goto-char (point-max)))) | |
305 | ((eq this-command 'delete-backward-char) | |
306 | (setq this-command 'ignore) | |
307 | (if (< (point) eshell-last-input-start) | |
308 | (eshell-show-output) | |
309 | (if (pos-visible-in-window-p eshell-last-input-start) | |
310 | (progn | |
311 | (ignore-errors | |
312 | (scroll-down)) | |
313 | (eshell-show-output)) | |
314 | (scroll-down) | |
315 | (if (pos-visible-in-window-p eshell-last-input-end) | |
316 | (eshell-show-output))))) | |
317 | ((or (memq this-command eshell-smart-display-navigate-list) | |
318 | (and (eq this-command 'eshell-send-input) | |
319 | (not (and (>= (point) eshell-last-input-start) | |
320 | (< (point) eshell-last-input-end))))) | |
321 | (setq clear t) | |
322 | (goto-char (point-max))))) | |
323 | (if clear | |
324 | (remove-hook 'pre-command-hook 'eshell-smart-display-move t)))) | |
325 | ||
326 | ;;; Code: | |
327 | ||
328 | ;;; em-smart.el ends here |