1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
;;; pulse.el --- Pulsing Overlays
;;; Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
;; Author: Eric M. Ludlam <eric@siege-engine.com>
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Manage temporary pulsing of faces and overlays.
;;
;; This is a temporal decoration technique where something is to be
;; highlighted briefly. This adds a gentle pulsing style to the text
;; decorated this way.
;;
;; The following are useful entry points:
;;
;; `pulse' - Cause `pulse-highlight-face' to shift toward background color.
;; Assumes you are using a version of Emacs that supports pulsing.
;;
;;
;; `pulse-momentary-highlight-one-line' - Pulse a single line at POINT.
;; `pulse-momentary-highlight-region' - Pulse a region.
;; `pulse-momentary-highlight-overlay' - Pulse an overlay
;; These three functions will just blink the specified area if
;; the version of Emacs you are using doesn't support pulsing.
;;
;; `pulse-line-hook-function' - A simple function that can be used in a
;; hook that will pulse whatever line the cursor is on.
;;
;;; History:
;;
;; The original pulse code was written for semantic tag highlighting.
;; It has been extracted, and adapted for general purpose pulsing.
;;
;; Pulse is a part of CEDET. http://cedet.sf.net
(defun pulse-available-p ()
"Return non-nil if pulsing is available on the current frame."
(condition-case nil
(let ((v (color-values (face-background 'default))))
(numberp (car-safe v)))
(error nil)))
(defcustom pulse-flag (pulse-available-p)
"*Non-nil means to pulse the overlay face for momentary highlighting.
Pulsing involves a bright highlight that slowly shifts to the background
color. Non-nil just means to highlight with an unchanging color for a short
time.
If `pulse-flag' is non-nil, but `pulse-available-p' is nil, then
this flag is ignored."
:group 'pulse
:type 'boolean)
(defface pulse-highlight-start-face
'((((class color) (background dark))
(:background "#AAAA33"))
(((class color) (background light))
(:background "#FFFFAA")))
"*Face used at beginning of a highight."
:group 'pulse)
(defface pulse-highlight-face
'((((class color) (background dark))
(:background "#AAAA33"))
(((class color) (background light))
(:background "#FFFFAA")))
"*Face used during a pulse for display. *DO NOT CUSTOMIZE*
Face used for temporary highlighting of tags for effect."
:group 'pulse)
;;; Code:
;;
(defun pulse-int-to-hex (int &optional nb-digits)
"Convert integer argument INT to a #XXXXXXXXXXXX format hex string.
Each X in the output string is a hexadecimal digit.
NB-DIGITS is the number of hex digits. If INT is too large to be
represented with NB-DIGITS, then the result is truncated from the
left. So, for example, INT=256 and NB-DIGITS=2 returns \"00\", since
the hex equivalent of 256 decimal is 100, which is more than 2 digits.
This function was blindly copied from hexrgb.el by Drew Adams.
http://www.emacswiki.org/cgi-bin/wiki/hexrgb.el"
(setq nb-digits (or nb-digits 4))
(substring (format (concat "%0" (int-to-string nb-digits) "X") int) (- nb-digits)))
(defun pulse-color-values-to-hex (values)
"Convert list of rgb color VALUES to a hex string, #XXXXXXXXXXXX.
Each X in the string is a hexadecimal digit.
Input VALUES is as for the output of `x-color-values'.
This function was blindly copied from hexrgb.el by Drew Adams.
http://www.emacswiki.org/cgi-bin/wiki/hexrgb.el"
(concat "#"
(pulse-int-to-hex (nth 0 values) 4) ; red
(pulse-int-to-hex (nth 1 values) 4) ; green
(pulse-int-to-hex (nth 2 values) 4))) ; blue
(defcustom pulse-iterations 10
"Number of iterations in a pulse operation."
:group 'pulse
:type 'number)
(defcustom pulse-delay .03
"Delay between face lightening iterations, as used by `sit-for'."
:group 'pulse
:type 'number)
(defun pulse-lighten-highlight ()
"Lighten the face by 1/`pulse-iterations' toward the background color.
Return t if there is more drift to do, nil if completed."
(if (>= (get 'pulse-highlight-face :iteration) pulse-iterations)
nil
(let* ((frame (color-values (face-background 'default)))
(start (color-values (face-background
(get 'pulse-highlight-face
:startface))))
(frac (list (/ (- (nth 0 frame) (nth 0 start)) pulse-iterations)
(/ (- (nth 1 frame) (nth 1 start)) pulse-iterations)
(/ (- (nth 2 frame) (nth 2 start)) pulse-iterations)))
(it (get 'pulse-highlight-face :iteration))
)
(set-face-background 'pulse-highlight-face
(pulse-color-values-to-hex
(list
(+ (nth 0 start) (* (nth 0 frac) it))
(+ (nth 1 start) (* (nth 1 frac) it))
(+ (nth 2 start) (* (nth 2 frac) it)))))
(put 'pulse-highlight-face :iteration (1+ it))
(if (>= (1+ it) pulse-iterations)
nil
t))))
(defun pulse-reset-face (&optional face)
"Reset the pulse highlighting FACE."
(set-face-background 'pulse-highlight-face
(if face
(face-background face)
(face-background 'pulse-highlight-start-face)
))
(put 'pulse-highlight-face :startface (or face
'pulse-highlight-start-face))
(put 'pulse-highlight-face :iteration 0))
(defun pulse (&optional face)
"Pulse the colors on our highlight face.
If optional FACE is provide, reset the face to FACE color,
instead of `pulse-highlight-start-face'.
Be sure to call `pulse-reset-face' after calling pulse."
(unwind-protect
(progn
(pulse-reset-face face)
(while (and (pulse-lighten-highlight)
(sit-for pulse-delay))
nil))))
;;; Convenience Functions
;;
(defvar pulse-momentary-overlay nil
"The current pulsing overlay.")
(defun pulse-momentary-highlight-overlay (o &optional face)
"Pulse the overlay O, unhighlighting before next command.
Optional argument FACE specifies the fact to do the highlighting."
(overlay-put o 'original-face (overlay-get o 'face))
(add-to-list 'pulse-momentary-overlay o)
(if (or (not pulse-flag) (not (pulse-available-p)))
;; Provide a face... clear on next command
(progn
(overlay-put o 'face (or face 'pulse-highlight-start-face))
(add-hook 'pre-command-hook
'pulse-momentary-unhighlight)
)
;; pulse it.
(unwind-protect
(progn
(overlay-put o 'face 'pulse-highlight-face)
;; The pulse function puts FACE onto 'pulse-highlight-face.
;; Thus above we put our face on the overlay, but pulse
;; with a reference face needed for the color.
(pulse face))
(pulse-momentary-unhighlight))))
(defun pulse-momentary-unhighlight ()
"Unhighlight a line recently highlighted."
;; If someone passes in an overlay, then pulse-momentary-overlay
;; will still be nil, and won't need modifying.
(when pulse-momentary-overlay
;; clear the starting face
(mapc
(lambda (ol)
(overlay-put ol 'face (overlay-get ol 'original-face))
(overlay-put ol 'original-face nil)
;; Clear the overlay if it needs deleting.
(when (overlay-get ol 'pulse-delete) (delete-overlay ol)))
pulse-momentary-overlay)
;; Clear the variable.
(setq pulse-momentary-overlay nil))
;; Reset the pulsing face.
(pulse-reset-face)
;; Remove this hook.
(remove-hook 'pre-command-hook 'pulse-momentary-unhighlight))
(defun pulse-momentary-highlight-one-line (point &optional face)
"Highlight the line around POINT, unhighlighting before next command.
Optional argument FACE specifies the face to do the highlighting."
(let ((start (point-at-bol))
(end (save-excursion
(end-of-line)
(when (not (eobp))
(forward-char 1))
(point))))
(pulse-momentary-highlight-region start end face)))
(defun pulse-momentary-highlight-region (start end &optional face)
"Highlight between START and END, unhighlighting before next command.
Optional argument FACE specifies the fact to do the highlighting."
(let ((o (make-overlay start end)))
;; Mark it for deletion
(overlay-put o 'pulse-delete t)
(pulse-momentary-highlight-overlay o face)))
;;; Random integration with other tools
(defvar pulse-command-advice-flag nil)
(defun pulse-line-hook-function ()
"Function used in hooks to pulse the current line.
Only pulses the line if `pulse-command-advice-flag' is non-nil."
(when pulse-command-advice-flag
(pulse-momentary-highlight-one-line (point))))
(provide 'pulse)
;; arch-tag: 6e2f78c1-65b3-4164-a141-872cb1552959
;;; pulse.el ends here
|
