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60370d40 | 1 | ;;; em-rebind.el --- rebind keys when point is at current input |
affbf647 | 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-rebind) | |
25 | ||
26 | (eval-when-compile (require 'esh-maint)) | |
27 | ||
28 | (defgroup eshell-rebind nil | |
29 | "This module allows for special keybindings that only take effect | |
30 | while the point is in a region of input text. By default, it binds | |
31 | C-a to move to the beginning of the input text (rather than just the | |
32 | beginning of the line), and C-p and C-n to move through the input | |
33 | history, C-u kills the current input text, etc. It also, if | |
34 | `eshell-confine-point-to-input' is non-nil, does not allow certain | |
35 | commands to cause the point to leave the input area, such as | |
36 | `backward-word', `previous-line', etc. This module intends to mimic | |
37 | the behavior of normal shells while the user editing new input text." | |
38 | :tag "Rebind keys at input" | |
39 | :group 'eshell-module) | |
40 | ||
41 | ;;; Commentary: | |
42 | ||
43 | ;;; User Variables: | |
44 | ||
45 | (defcustom eshell-rebind-load-hook '(eshell-rebind-initialize) | |
46 | "*A list of functions to call when loading `eshell-rebind'." | |
47 | :type 'hook | |
48 | :group 'eshell-rebind) | |
49 | ||
50 | (defcustom eshell-rebind-keys-alist | |
51 | '(([(control ?a)] . eshell-bol) | |
52 | ([home] . eshell-bol) | |
53 | ([(control ?d)] . eshell-delchar-or-maybe-eof) | |
54 | ([backspace] . eshell-delete-backward-char) | |
55 | ([delete] . eshell-delete-backward-char) | |
56 | ([(control ?w)] . backward-kill-word) | |
57 | ([(control ?u)] . eshell-kill-input)) | |
58 | "*Bind some keys differently if point is in input text." | |
59 | :type '(repeat (cons (vector :tag "Keys to bind" | |
60 | (repeat :inline t sexp)) | |
61 | (function :tag "Command"))) | |
62 | :group 'eshell-rebind) | |
63 | ||
64 | (defcustom eshell-confine-point-to-input t | |
65 | "*If non-nil, do not allow the point to leave the current input. | |
66 | This is more difficult to do nicely in Emacs than one might think. | |
67 | Basically, the `point-left' attribute is added to the input text, and | |
68 | a function is placed on that hook to take the point back to | |
69 | `eshell-last-output-end' every time the user tries to move away. But | |
70 | since there are many cases in which the point _ought_ to move away | |
71 | \(for programmatic reasons), the variable | |
72 | `eshell-cannot-leave-input-list' defines commands which are affected | |
73 | from this rule. However, this list is by no means as complete as it | |
74 | probably should be, so basically all one can hope for is that other | |
75 | people will left the point alone in the Eshell buffer. Sigh." | |
76 | :type 'boolean | |
77 | :group 'eshell-rebind) | |
78 | ||
79 | (defcustom eshell-error-if-move-away t | |
80 | "*If non-nil, consider it an error to try to move outside current input. | |
81 | This is default behavior of shells like bash." | |
82 | :type 'boolean | |
83 | :group 'eshell-rebind) | |
84 | ||
85 | (defcustom eshell-remap-previous-input t | |
86 | "*If non-nil, remap input keybindings on previous prompts as well." | |
87 | :type 'boolean | |
88 | :group 'eshell-rebind) | |
89 | ||
90 | (defcustom eshell-cannot-leave-input-list | |
91 | '(beginning-of-line-text | |
92 | beginning-of-line | |
93 | move-to-column | |
94 | move-to-column-force | |
95 | move-to-left-margin | |
96 | move-to-tab-stop | |
97 | forward-char | |
98 | backward-char | |
99 | delete-char | |
100 | delete-backward-char | |
101 | backward-delete-char | |
102 | backward-delete-char-untabify | |
103 | kill-paragraph | |
104 | backward-kill-paragraph | |
105 | kill-sentence | |
106 | backward-kill-sentence | |
107 | kill-sexp | |
108 | backward-kill-sexp | |
109 | kill-word | |
110 | backward-kill-word | |
111 | kill-region | |
112 | forward-list | |
113 | backward-list | |
114 | forward-page | |
115 | backward-page | |
116 | forward-point | |
117 | forward-paragraph | |
118 | backward-paragraph | |
119 | backward-prefix-chars | |
120 | forward-sentence | |
121 | backward-sentence | |
122 | forward-sexp | |
123 | backward-sexp | |
124 | forward-to-indentation | |
125 | backward-to-indentation | |
126 | backward-up-list | |
127 | forward-word | |
128 | backward-word | |
129 | forward-line | |
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130 | previous-line |
131 | next-line | |
132 | forward-visible-line | |
133 | forward-comment | |
134 | forward-thing) | |
135 | "*A list of commands that cannot leave the input area." | |
136 | :type '(repeat function) | |
137 | :group 'eshell-rebind) | |
138 | ||
139 | ;; Internal Variables: | |
140 | ||
141 | (defvar eshell-input-keymap) | |
142 | (defvar eshell-previous-point) | |
143 | (defvar eshell-lock-keymap) | |
144 | ||
145 | ;;; Functions: | |
146 | ||
147 | (defun eshell-rebind-initialize () | |
148 | "Initialize the inputing code." | |
149 | (unless eshell-non-interactive-p | |
150 | (make-local-hook 'eshell-mode-hook) | |
151 | (add-hook 'eshell-mode-hook 'eshell-setup-input-keymap nil t) | |
152 | (make-local-hook 'pre-command-hook) | |
153 | (make-local-variable 'eshell-previous-point) | |
154 | (add-hook 'pre-command-hook 'eshell-save-previous-point nil t) | |
155 | (make-local-hook 'post-command-hook) | |
156 | (make-local-variable 'overriding-local-map) | |
157 | (add-hook 'post-command-hook 'eshell-rebind-input-map nil t) | |
158 | (set (make-local-variable 'eshell-lock-keymap) nil) | |
159 | (define-key eshell-command-map [(meta ?l)] 'eshell-lock-local-map))) | |
160 | ||
161 | (defun eshell-lock-local-map (&optional arg) | |
162 | "Lock or unlock the current local keymap. | |
163 | Within a prefix arg, set the local keymap to its normal value, and | |
164 | lock it at that." | |
165 | (interactive "P") | |
166 | (if (or arg (not eshell-lock-keymap)) | |
167 | (progn | |
168 | (use-local-map eshell-mode-map) | |
169 | (setq eshell-lock-keymap t) | |
170 | (message "Local keymap locked in normal mode")) | |
171 | (use-local-map eshell-input-keymap) | |
172 | (setq eshell-lock-keymap nil) | |
173 | (message "Local keymap unlocked: obey context"))) | |
174 | ||
175 | (defun eshell-save-previous-point () | |
176 | "Save the location of point before the next command is run." | |
177 | (setq eshell-previous-point (point))) | |
178 | ||
179 | (defsubst eshell-point-within-input-p (pos) | |
180 | "Test whether POS is within an input range." | |
181 | (let (begin) | |
182 | (or (and (>= pos eshell-last-output-end) | |
183 | eshell-last-output-end) | |
184 | (and eshell-remap-previous-input | |
185 | (setq begin | |
186 | (save-excursion | |
187 | (eshell-bol) | |
188 | (and (not (bolp)) (point)))) | |
189 | (>= pos begin) | |
190 | (<= pos (line-end-position)) | |
191 | begin)))) | |
192 | ||
193 | (defun eshell-rebind-input-map () | |
194 | "Rebind the input keymap based on the location of the cursor." | |
195 | (ignore-errors | |
196 | (unless eshell-lock-keymap | |
197 | (if (eshell-point-within-input-p (point)) | |
198 | (use-local-map eshell-input-keymap) | |
199 | (let (begin) | |
200 | (if (and eshell-confine-point-to-input | |
201 | (setq begin | |
202 | (eshell-point-within-input-p eshell-previous-point)) | |
203 | (memq this-command eshell-cannot-leave-input-list)) | |
204 | (progn | |
205 | (use-local-map eshell-input-keymap) | |
206 | (goto-char begin) | |
207 | (if (and eshell-error-if-move-away | |
208 | (not (eq this-command 'kill-region))) | |
209 | (beep))) | |
210 | (use-local-map eshell-mode-map))))))) | |
211 | ||
212 | (defun eshell-setup-input-keymap () | |
213 | "Setup the input keymap to be used during input editing." | |
214 | (make-local-variable 'eshell-input-keymap) | |
215 | (setq eshell-input-keymap (make-sparse-keymap)) | |
216 | (set-keymap-parent eshell-input-keymap eshell-mode-map) | |
217 | (let ((bindings eshell-rebind-keys-alist)) | |
218 | (while bindings | |
219 | (define-key eshell-input-keymap (caar bindings) | |
220 | (cdar bindings)) | |
221 | (setq bindings (cdr bindings))))) | |
222 | ||
223 | (defun eshell-delete-backward-char (n &optional killflag) | |
224 | "Delete the last character, unless it's part of the output." | |
225 | (interactive "P") | |
226 | (let ((count (prefix-numeric-value n))) | |
227 | (if (eshell-point-within-input-p (- (point) count)) | |
228 | (delete-backward-char count n) | |
229 | (beep)))) | |
230 | ||
231 | (defun eshell-delchar-or-maybe-eof (arg) | |
232 | "Delete ARG characters forward or send an EOF to subprocess. | |
233 | Sends an EOF only if point is at the end of the buffer and there is no | |
234 | input." | |
235 | (interactive "p") | |
8c6b1d83 | 236 | (let ((proc (eshell-interactive-process))) |
affbf647 GM |
237 | (if (eobp) |
238 | (cond | |
ca7aae91 | 239 | ((/= (point) eshell-last-output-end) |
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240 | (beep)) |
241 | (proc | |
242 | (process-send-eof)) | |
243 | (t | |
244 | (eshell-life-is-too-much))) | |
245 | (eshell-delete-backward-char (- arg))))) | |
246 | ||
247 | ;;; Code: | |
248 | ||
249 | ;;; em-rebind.el ends here |