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1 | ;;; rfn-eshadow.el --- Highlight `shadowed' part of read-file-name input text |
2 | ;; | |
0d30b337 | 3 | ;; Copyright (C) 2000, 2001, 2002, 2003, 2004, |
409cc4a3 | 4 | ;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc. |
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5 | ;; |
6 | ;; Author: Miles Bader <miles@gnu.org> | |
476cf013 | 7 | ;; Keywords: convenience minibuffer |
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8 | |
9 | ;; This file is part of GNU Emacs. | |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
b4aa6026 | 13 | ;; the Free Software Foundation; either version 3, or (at your option) |
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14 | ;; any later version. |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
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23 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
24 | ;; Boston, MA 02110-1301, USA. | |
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25 | |
26 | ;;; Commentary: | |
27 | ;; | |
476cf013 | 28 | ;; Defines the mode `file-name-shadow-mode'. |
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29 | ;; |
30 | ;; The `read-file-name' function passes its result through | |
31 | ;; `substitute-in-file-name', so any part of the string preceding | |
32 | ;; multiple slashes (or a drive indicator on MS-DOS/MS-Windows) is | |
33 | ;; ignored. | |
34 | ;; | |
476cf013 | 35 | ;; If `file-name-shadow-mode' is active, any part of the |
519f7ff6 | 36 | ;; minibuffer text that would be ignored because of this is given the |
476cf013 | 37 | ;; properties in `file-name-shadow-properties', which may |
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38 | ;; be used to make the ignored text invisible, dim, etc. |
39 | ;; | |
40 | ||
41 | ;;; Code: | |
42 | ||
43 | \f | |
44 | ;;; Customization | |
45 | ||
476cf013 | 46 | (defconst file-name-shadow-properties-custom-type |
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47 | '(list |
48 | (checklist :inline t | |
49 | (const :tag "Invisible" | |
50 | :doc "Make shadowed part of filename invisible" | |
51 | :format "%t%n%h" | |
52 | :inline t | |
53 | (invisible t intangible t)) | |
54 | (list :inline t | |
55 | :format "%v" | |
56 | :tag "Face" | |
57 | :doc "Display shadowed part of filename using a different face" | |
58 | (const :format "" face) | |
476cf013 | 59 | (face :value file-name-shadow)) |
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60 | (list :inline t |
61 | :format "%t: %v%h" | |
62 | :tag "Brackets" | |
63 | ;; Note the 4 leading spaces in the doc string; | |
64 | ;; this is hack to get around the fact that the | |
65 | ;; newline after the second string widget comes | |
66 | ;; from the string widget, and doesn't indent | |
67 | ;; correctly. We could use a :size attribute to | |
68 | ;; make the second string widget not have a | |
69 | ;; terminating newline, but this makes it impossible | |
70 | ;; to enter trailing whitespace, and it's desirable | |
71 | ;; that it be possible. | |
72 | :doc " Surround shadowed part of filename with brackets" | |
73 | (const :format "" before-string) | |
74 | (string :format "%v" :size 4 :value "{") | |
75 | (const :format "" after-string) | |
76 | ;; see above about why the 2nd string doesn't use :size | |
77 | (string :format " and: %v" :value "} ")) | |
78 | (list :inline t | |
79 | :format "%t: %v%n%h" | |
80 | :tag "String" | |
81 | :doc "Display a string instead of the shadowed part of filename" | |
82 | (const :format "" display) | |
83 | (string :format "%v" :size 15 :value "<...ignored...>")) | |
84 | (const :tag "Avoid" | |
85 | :doc "Try to keep cursor out of shadowed part of filename" | |
86 | :format "%t%n%h" | |
87 | :inline t | |
88 | (field shadow))) | |
89 | (repeat :inline t | |
90 | :tag "Other Properties" | |
91 | (list :inline t | |
92 | :format "%v" | |
93 | (symbol :tag "Property") | |
94 | (sexp :tag "Value"))))) | |
95 | ||
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96 | (defcustom file-name-shadow-properties |
97 | '(face file-name-shadow field shadow) | |
519f7ff6 | 98 | "Properties given to the `shadowed' part of a filename in the minibuffer. |
476cf013 | 99 | Only used when `file-name-shadow-mode' is active. |
2fe3d6ec | 100 | If Emacs is not running under a window system, |
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101 | `file-name-shadow-tty-properties' is used instead." |
102 | :type file-name-shadow-properties-custom-type | |
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103 | :group 'minibuffer |
104 | :version "22.1") | |
519f7ff6 | 105 | |
476cf013 | 106 | (defcustom file-name-shadow-tty-properties |
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107 | '(before-string "{" after-string "} " field shadow) |
108 | "Properties given to the `shadowed' part of a filename in the minibuffer. | |
82db9283 JB |
109 | Only used when `file-name-shadow-mode' is active and Emacs |
110 | is not running under a window-system; if Emacs is running under a window | |
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111 | system, `file-name-shadow-properties' is used instead." |
112 | :type file-name-shadow-properties-custom-type | |
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113 | :group 'minibuffer |
114 | :version "22.1") | |
519f7ff6 | 115 | |
476cf013 | 116 | (defface file-name-shadow |
c3423c97 | 117 | '((t :inherit shadow)) |
476cf013 | 118 | "Face used by `file-name-shadow-mode' for the shadow." |
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119 | :group 'minibuffer |
120 | :version "22.1") | |
519f7ff6 | 121 | |
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122 | (defvar rfn-eshadow-setup-minibuffer-hook nil |
123 | "Minibuffer setup functions from other packages.") | |
124 | ||
125 | (defvar rfn-eshadow-update-overlay-hook nil | |
126 | "Customer overlay functions from other packages") | |
127 | ||
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128 | \f |
129 | ;;; Internal variables | |
130 | ||
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131 | ;; A list of minibuffers to which we've added a post-command-hook. |
132 | (defvar rfn-eshadow-frobbed-minibufs nil) | |
133 | ||
134 | ;; An overlay covering the shadowed part of the filename (local to the | |
135 | ;; minibuffer). | |
136 | (defvar rfn-eshadow-overlay) | |
137 | (make-variable-buffer-local 'rfn-eshadow-overlay) | |
138 | ||
139 | \f | |
140 | ;;; Hook functions | |
141 | ||
142 | ;; This function goes on minibuffer-setup-hook | |
143 | (defun rfn-eshadow-setup-minibuffer () | |
476cf013 | 144 | "Set up a minibuffer for `file-name-shadow-mode'. |
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145 | The prompt and initial input should already have been inserted." |
146 | (when minibuffer-completing-file-name | |
147 | (setq rfn-eshadow-overlay | |
148 | (make-overlay (minibuffer-prompt-end) (minibuffer-prompt-end))) | |
149 | ;; Give rfn-eshadow-overlay the user's props. | |
150 | (let ((props | |
151 | (if window-system | |
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152 | file-name-shadow-properties |
153 | file-name-shadow-tty-properties))) | |
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154 | (while props |
155 | (overlay-put rfn-eshadow-overlay (pop props) (pop props)))) | |
156 | ;; Turn on overlay evaporation so that we don't have to worry about | |
157 | ;; odd effects when the overlay sits empty at the beginning of the | |
158 | ;; minibuffer. | |
159 | (overlay-put rfn-eshadow-overlay 'evaporate t) | |
160 | ;; Add our post-command hook, and make sure can remove it later. | |
161 | (add-to-list 'rfn-eshadow-frobbed-minibufs (current-buffer)) | |
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162 | (add-hook 'post-command-hook #'rfn-eshadow-update-overlay nil t) |
163 | ;; Run custom hook | |
164 | (run-hooks 'rfn-eshadow-setup-minibuffer-hook))) | |
519f7ff6 | 165 | |
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166 | (defsubst rfn-eshadow-sifn-equal (goal pos) |
167 | (equal goal (condition-case nil | |
168 | (substitute-in-file-name | |
169 | (buffer-substring-no-properties pos (point-max))) | |
170 | ;; `substitute-in-file-name' can fail on partial input. | |
171 | (error nil)))) | |
172 | ||
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173 | ;; post-command-hook to update overlay |
174 | (defun rfn-eshadow-update-overlay () | |
175 | "Update `rfn-eshadow-overlay' to cover shadowed part of minibuffer input. | |
2fe3d6ec | 176 | This is intended to be used as a minibuffer `post-command-hook' for |
476cf013 | 177 | `file-name-shadow-mode'; the minibuffer should have already |
519f7ff6 | 178 | been set up by `rfn-eshadow-setup-minibuffer'." |
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179 | (condition-case nil |
180 | (let ((goal (substitute-in-file-name (minibuffer-contents))) | |
181 | (mid (overlay-end rfn-eshadow-overlay)) | |
182 | (start (minibuffer-prompt-end)) | |
183 | (end (point-max))) | |
184 | (unless | |
185 | ;; Catch the common case where the shadow does not need to move. | |
186 | (and mid | |
187 | (or (eq mid end) | |
188 | (not (rfn-eshadow-sifn-equal goal (1+ mid)))) | |
189 | (or (eq mid start) | |
190 | (rfn-eshadow-sifn-equal goal mid))) | |
191 | ;; Binary search for the greatest position still equivalent to | |
192 | ;; the whole. | |
193 | (while (or (< (1+ start) end) | |
194 | (if (and (< (1+ end) (point-max)) | |
195 | (rfn-eshadow-sifn-equal goal (1+ end))) | |
196 | ;; (SIFN end) != goal, but (SIFN (1+end)) == goal, | |
197 | ;; We've reached a discontinuity: this can happen | |
198 | ;; e.g. if `end' point to "/:...". | |
199 | (setq start (1+ end) end (point-max)))) | |
200 | (setq mid (/ (+ start end) 2)) | |
201 | (if (rfn-eshadow-sifn-equal goal mid) | |
202 | (setq start mid) | |
203 | (setq end mid))) | |
d037d501 MA |
204 | (move-overlay rfn-eshadow-overlay (minibuffer-prompt-end) start)) |
205 | ;; Run custom hook | |
206 | (run-hooks 'rfn-eshadow-update-overlay-hook)) | |
2fe3d6ec SM |
207 | ;; `substitute-in-file-name' can fail on partial input. |
208 | (error nil))) | |
519f7ff6 | 209 | \f |
476cf013 | 210 | (define-minor-mode file-name-shadow-mode |
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211 | "Toggle File-Name Shadow mode. |
212 | When active, any part of a filename being read in the minibuffer | |
213 | that would be ignored (because the result is passed through | |
214 | `substitute-in-file-name') is given the properties in | |
476cf013 | 215 | `file-name-shadow-properties', which can be used to make |
b2c8e6ab | 216 | that portion dim, invisible, or otherwise less visually noticeable. |
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217 | |
218 | With prefix argument ARG, turn on if positive, otherwise off. | |
219 | Returns non-nil if the new state is enabled." | |
220 | :global t | |
da80e0da | 221 | :init-value t |
519f7ff6 | 222 | :group 'minibuffer |
496f36c0 | 223 | :version "22.1" |
476cf013 | 224 | (if file-name-shadow-mode |
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225 | ;; Enable the mode |
226 | (add-hook 'minibuffer-setup-hook 'rfn-eshadow-setup-minibuffer) | |
227 | ;; Disable the mode | |
228 | (remove-hook 'minibuffer-setup-hook 'rfn-eshadow-setup-minibuffer) | |
229 | ;; Remove our entry from any post-command-hook variable's it's still in | |
230 | (dolist (minibuf rfn-eshadow-frobbed-minibufs) | |
231 | (with-current-buffer minibuf | |
232 | (remove-hook 'post-command-hook #'rfn-eshadow-update-overlay t))) | |
233 | (setq rfn-eshadow-frobbed-minibufs nil))) | |
234 | ||
235 | ||
236 | (provide 'rfn-eshadow) | |
237 | ||
2fe3d6ec | 238 | ;; arch-tag: dcf70a52-0115-4ec2-b1e3-4f8d3541a888 |
519f7ff6 | 239 | ;;; rfn-eshadow.el ends here |