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1 | ;;; rfn-eshadow.el --- Highlight `shadowed' part of read-file-name input text |
2 | ;; | |
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3 | ;; Copyright (C) 2000, 2001, 2002, 2003, 2004, |
4 | ;; 2005 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 | |
13 | ;; the Free Software Foundation; either version 2, or (at your option) | |
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 | ||
18a90ec7 | 96 | ;;;###autoload |
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97 | (defcustom file-name-shadow-properties |
98 | '(face file-name-shadow field shadow) | |
519f7ff6 | 99 | "Properties given to the `shadowed' part of a filename in the minibuffer. |
476cf013 | 100 | Only used when `file-name-shadow-mode' is active. |
519f7ff6 | 101 | If emacs is not running under a window system, |
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102 | `file-name-shadow-tty-properties' is used instead." |
103 | :type file-name-shadow-properties-custom-type | |
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104 | :group 'minibuffer) |
105 | ||
18a90ec7 | 106 | ;;;###autoload |
476cf013 | 107 | (defcustom file-name-shadow-tty-properties |
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108 | '(before-string "{" after-string "} " field shadow) |
109 | "Properties given to the `shadowed' part of a filename in the minibuffer. | |
476cf013 | 110 | Only used when `file-name-shadow-mode' is active and emacs |
519f7ff6 | 111 | is not running under a window-system; if emacs is running under a window |
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112 | system, `file-name-shadow-properties' is used instead." |
113 | :type file-name-shadow-properties-custom-type | |
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114 | :group 'minibuffer) |
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 | ||
121 | \f | |
122 | ;;; Internal variables | |
123 | ||
124 | ;; Regexp to locate dividing point between shadow and real pathname | |
125 | (defconst rfn-eshadow-regexp | |
126 | (cond ((memq system-type '(ms-dos windows-nt)) | |
127 | ;; This horrible regexp considers the following patterns as | |
128 | ;; starting an absolute pathname, when following a `/' or an `\': | |
129 | ;; L: / // ~ $ \\ \\\\ | |
f4be0a12 | 130 | "\\(.*[^/]+/+?\\|/*?\\|\\)\\(~\\|$[^$]\\|$\\'\\|[][\\^a-z]:\\|//?\\([^][\\^a-z/$~]\\|[^/$~][^:]\\|[^/$~]?\\'\\)\\)") |
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131 | (t |
132 | ;; default is for unix-style filenames | |
f4be0a12 | 133 | "\\(.*/\\)\\([/~]\\|$[^$]\\|$\\'\\)")) |
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134 | "Regular expression used to match shadowed filenames. |
135 | There should be at least one regexp group; the end of the first one | |
136 | is used as the end of the shadowed portion of the filename.") | |
137 | ||
138 | ;; A list of minibuffers to which we've added a post-command-hook. | |
139 | (defvar rfn-eshadow-frobbed-minibufs nil) | |
140 | ||
141 | ;; An overlay covering the shadowed part of the filename (local to the | |
142 | ;; minibuffer). | |
143 | (defvar rfn-eshadow-overlay) | |
144 | (make-variable-buffer-local 'rfn-eshadow-overlay) | |
145 | ||
146 | \f | |
147 | ;;; Hook functions | |
148 | ||
149 | ;; This function goes on minibuffer-setup-hook | |
150 | (defun rfn-eshadow-setup-minibuffer () | |
476cf013 | 151 | "Set up a minibuffer for `file-name-shadow-mode'. |
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152 | The prompt and initial input should already have been inserted." |
153 | (when minibuffer-completing-file-name | |
154 | (setq rfn-eshadow-overlay | |
155 | (make-overlay (minibuffer-prompt-end) (minibuffer-prompt-end))) | |
156 | ;; Give rfn-eshadow-overlay the user's props. | |
157 | (let ((props | |
158 | (if window-system | |
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159 | file-name-shadow-properties |
160 | file-name-shadow-tty-properties))) | |
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161 | (while props |
162 | (overlay-put rfn-eshadow-overlay (pop props) (pop props)))) | |
163 | ;; Turn on overlay evaporation so that we don't have to worry about | |
164 | ;; odd effects when the overlay sits empty at the beginning of the | |
165 | ;; minibuffer. | |
166 | (overlay-put rfn-eshadow-overlay 'evaporate t) | |
167 | ;; Add our post-command hook, and make sure can remove it later. | |
168 | (add-to-list 'rfn-eshadow-frobbed-minibufs (current-buffer)) | |
169 | (add-hook 'post-command-hook #'rfn-eshadow-update-overlay nil t))) | |
170 | ||
171 | ;; post-command-hook to update overlay | |
172 | (defun rfn-eshadow-update-overlay () | |
173 | "Update `rfn-eshadow-overlay' to cover shadowed part of minibuffer input. | |
174 | This is intended to be used as a minibuffer post-command-hook for | |
476cf013 | 175 | `file-name-shadow-mode'; the minibuffer should have already |
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176 | been set up by `rfn-eshadow-setup-minibuffer'." |
177 | ;; This is not really a correct implementation; it won't always do the | |
178 | ;; right thing in the presence of environment variables that | |
179 | ;; substitute-in-file-name would expand; currently it just assumes any | |
a01b7831 | 180 | ;; environment variable contains an absolute filename. |
519f7ff6 | 181 | (save-excursion |
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182 | (let ((inhibit-point-motion-hooks t)) |
183 | (goto-char (minibuffer-prompt-end)) | |
184 | ;; Update the overlay (which will evaporate if it's empty). | |
185 | (move-overlay rfn-eshadow-overlay | |
186 | (point) | |
187 | (if (looking-at rfn-eshadow-regexp) | |
188 | (match-end 1) | |
189 | (point)))))) | |
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190 | |
191 | \f | |
192 | ;;; Note this definition must be at the end of the file, because | |
193 | ;;; `define-minor-mode' actually calls the mode-function if the | |
194 | ;;; associated variable is non-nil, which requires that all needed | |
195 | ;;; functions be already defined. [This is arguably a bug in d-m-m] | |
196 | ;;;###autoload | |
476cf013 | 197 | (define-minor-mode file-name-shadow-mode |
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198 | "Toggle File-Name Shadow mode. |
199 | When active, any part of a filename being read in the minibuffer | |
200 | that would be ignored (because the result is passed through | |
201 | `substitute-in-file-name') is given the properties in | |
476cf013 | 202 | `file-name-shadow-properties', which can be used to make |
b2c8e6ab | 203 | that portion dim, invisible, or otherwise less visually noticeable. |
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204 | |
205 | With prefix argument ARG, turn on if positive, otherwise off. | |
206 | Returns non-nil if the new state is enabled." | |
207 | :global t | |
208 | :group 'minibuffer | |
476cf013 | 209 | (if file-name-shadow-mode |
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210 | ;; Enable the mode |
211 | (add-hook 'minibuffer-setup-hook 'rfn-eshadow-setup-minibuffer) | |
212 | ;; Disable the mode | |
213 | (remove-hook 'minibuffer-setup-hook 'rfn-eshadow-setup-minibuffer) | |
214 | ;; Remove our entry from any post-command-hook variable's it's still in | |
215 | (dolist (minibuf rfn-eshadow-frobbed-minibufs) | |
216 | (with-current-buffer minibuf | |
217 | (remove-hook 'post-command-hook #'rfn-eshadow-update-overlay t))) | |
218 | (setq rfn-eshadow-frobbed-minibufs nil))) | |
219 | ||
220 | ||
221 | (provide 'rfn-eshadow) | |
222 | ||
ab5796a9 | 223 | ;;; arch-tag: dcf70a52-0115-4ec2-b1e3-4f8d3541a888 |
519f7ff6 | 224 | ;;; rfn-eshadow.el ends here |