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
|
;;; highlight-indentation.el --- Minor modes for highlighting indentation
;; Author: Anton Johansson <anton.johansson@gmail.com> - http://antonj.se
;; Created: Dec 15 23:42:04 2010
;; Version: 0.7.0
;; URL: https://github.com/antonj/Highlight-Indentation-for-Emacs
;;
;; This program 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 2 of
;; the License, or (at your option) any later version.
;;
;; This program 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.
;;
;;; Commentary:
;; Customize `highlight-indentation-face', and
;; `highlight-indentation-current-column-face' to suit your theme.
;;; Code:
(defgroup highlight-indentation nil
"Highlight Indentation"
:prefix "highlight-indentation-"
:group 'basic-faces)
(defface highlight-indentation-face
;; Fringe has non intrusive color in most color-themes
'((t :inherit fringe))
"Basic face for highlighting indentation guides."
:group 'highlight-indentation)
(defcustom highlight-indentation-offset 4
"Default indentation offset, used if no other can be found from
major mode. This value is always used by
`highlight-indentation-mode' if set buffer local. Set buffer
local with `highlight-indentation-set-offset'"
:group 'highlight-indentation)
(defconst highlight-indentation-hooks
'((after-change-functions (lambda (start end length)
(highlight-indentation-redraw-region
start end
'highlight-indentation-overlay
'highlight-indentation-put-overlays-region))
t t)
(window-scroll-functions (lambda (win start)
(highlight-indentation-redraw-window
win
'highlight-indentation-overlay
'highlight-indentation-put-overlays-region
start))
nil t)))
(defun highlight-indentation-get-buffer-windows (&optional all-frames)
"Return a list of windows displaying the current buffer."
(get-buffer-window-list (current-buffer) 'no-minibuf all-frames))
(defun highlight-indentation-delete-overlays-buffer (overlay)
"Delete all overlays in the current buffer."
(save-restriction
(widen)
(highlight-indentation-delete-overlays-region (point-min) (point-max) overlay)))
(defun highlight-indentation-delete-overlays-region (start end overlay)
"Delete overlays between START and END."
(mapc #'(lambda (o)
(if (overlay-get o overlay) (delete-overlay o)))
(overlays-in start end)))
(defun highlight-indentation-redraw-window (win overlay func &optional start)
"Redraw win starting from START."
(highlight-indentation-redraw-region (or start (window-start win)) (window-end win t) overlay func))
(defun highlight-indentation-redraw-region (start end overlay func)
"Erease and read overlays between START and END."
(save-match-data
(save-excursion
(let ((inhibit-point-motion-hooks t)
(end (save-excursion (goto-char end) (line-beginning-position 2))))
(highlight-indentation-delete-overlays-region start end overlay)
(funcall func start end overlay)))))
(defun highlight-indentation-redraw-all-windows (overlay func &optional all-frames)
"Redraw the all windows showing the current buffer."
(dolist (win (highlight-indentation-get-buffer-windows all-frames))
(highlight-indentation-redraw-window win overlay func)))
(defun highlight-indentation-put-overlays-region (start end overlay)
"Place overlays between START and END."
(goto-char start)
(let (o ;; overlay
(last-indent 0)
(pos start))
(while (< pos end)
(beginning-of-line)
(while (and (integerp (char-after))
(not (= 10 (char-after))) ;; newline
(= 32 (char-after))) ;; space
(when (= 0 (% (current-column) highlight-indentation-offset))
(setq pos (point)
last-indent pos
o (make-overlay pos (+ pos 1)))
(overlay-put o overlay t)
(overlay-put o 'priority highlight-indentation-overlay-priority)
(overlay-put o 'face 'highlight-indentation-face))
(forward-char))
(forward-line) ;; Next line
(setq pos (point)))))
(defun highlight-indentation-guess-offset ()
"Get indentation offset of current buffer"
(cond ((and (eq major-mode 'python-mode) (boundp 'python-indent))
python-indent)
((and (eq major-mode 'python-mode) (boundp 'py-indent-offset))
py-indent-offset)
((and (eq major-mode 'python-mode) (boundp 'python-indent-offset))
python-indent-offset)
((eq major-mode 'ruby-mode)
ruby-indent-level)
((and (eq major-mode 'scala-mode) (boundp 'scala-indent:step))
scala-indent:step)
((and (eq major-mode 'scala-mode) (boundp 'scala-mode-indent:step))
scala-mode-indent:step)
((or (eq major-mode 'scss-mode) (eq major-mode 'css-mode))
css-indent-offset)
((eq major-mode 'nxml-mode)
nxml-child-indent)
((eq major-mode 'coffee-mode)
coffee-tab-width)
((eq major-mode 'js-mode)
js-indent-level)
((eq major-mode 'js2-mode)
js2-basic-offset)
((and (fboundp 'derived-mode-class) (eq (derived-mode-class major-mode) 'sws-mode))
sws-tab-width)
((eq major-mode 'web-mode)
web-mode-html-offset) ; other similar vars: web-mode-{css-indent,scripts}-offset
((local-variable-p 'c-basic-offset)
c-basic-offset)
(t
(default-value 'highlight-indentation-offset))))
;;;###autoload
(define-minor-mode highlight-indentation-mode
"Highlight indentation minor mode highlights indentation based on spaces"
:lighter " ||"
(when (not highlight-indentation-mode) ;; OFF
(highlight-indentation-delete-overlays-buffer 'highlight-indentation-overlay)
(dolist (hook highlight-indentation-hooks)
(remove-hook (car hook) (nth 1 hook) (nth 3 hook))))
(when highlight-indentation-mode ;; ON
(when (not (local-variable-p 'highlight-indentation-offset))
(set (make-local-variable 'highlight-indentation-offset)
(highlight-indentation-guess-offset)))
;; Setup hooks
(dolist (hook highlight-indentation-hooks)
(apply 'add-hook hook))
(highlight-indentation-redraw-all-windows 'highlight-indentation-overlay
'highlight-indentation-put-overlays-region)))
;;;###autoload
(defun highlight-indentation-set-offset (offset)
"Set indentation offset localy in buffer, will prevent
highlight-indentation from trying to guess indentation offset
from major mode"
(interactive
(if (and current-prefix-arg (not (consp current-prefix-arg)))
(list (prefix-numeric-value current-prefix-arg))
(list (read-number "Indentation offset: "))))
(set (make-local-variable 'highlight-indentation-offset) offset)
(when highlight-indentation-mode
(highlight-indentation-mode)))
;;; This minor mode will highlight the indentation of the current line
;;; as a vertical bar (grey background color) aligned with the column of the
;;; first character of the current line.
(defface highlight-indentation-current-column-face
;; Fringe has non intrusive color in most color-themes
'((t (:background "black")))
"Basic face for highlighting indentation guides."
:group 'highlight-indentation)
(defvar highlight-indentation-overlay-priority 1)
(defvar highlight-indentation-current-column-overlay-priority 2)
(defconst highlight-indentation-current-column-hooks
'((post-command-hook (lambda ()
(highlight-indentation-redraw-all-windows 'highlight-indentation-current-column-overlay
'highlight-indentation-current-column-put-overlays-region)) nil t)))
(defun highlight-indentation-current-column-put-overlays-region (start end overlay)
"Place overlays between START and END."
(let (o ;; overlay
(last-indent 0)
(indent (save-excursion (back-to-indentation) (current-column)))
(pos start))
(goto-char start)
;; (message "doing it %d" indent)
(while (< pos end)
(beginning-of-line)
(while (and (integerp (char-after))
(not (= 10 (char-after))) ;; newline
(= 32 (char-after))) ;; space
(when (= (current-column) indent)
(setq pos (point)
last-indent pos
o (make-overlay pos (+ pos 1)))
(overlay-put o overlay t)
(overlay-put o 'priority highlight-indentation-current-column-overlay-priority)
(overlay-put o 'face 'highlight-indentation-current-column-face))
(forward-char))
(forward-line) ;; Next line
(setq pos (point)))))
;;;###autoload
(define-minor-mode highlight-indentation-current-column-mode
"Hilight Indentation minor mode displays a vertical bar
corresponding to the indentation of the current line"
:lighter " |"
(when (not highlight-indentation-current-column-mode) ;; OFF
(highlight-indentation-delete-overlays-buffer 'highlight-indentation-current-column-overlay)
(dolist (hook highlight-indentation-current-column-hooks)
(remove-hook (car hook) (nth 1 hook) (nth 3 hook))))
(when highlight-indentation-current-column-mode ;; ON
(when (not (local-variable-p 'highlight-indentation-offset))
(set (make-local-variable 'highlight-indentation-offset)
(highlight-indentation-guess-offset)))
;; Setup hooks
(dolist (hook highlight-indentation-current-column-hooks)
(apply 'add-hook hook))
(highlight-indentation-redraw-all-windows 'highlight-indentation-current-column-overlay
'highlight-indentation-current-column-put-overlays-region)))
(provide 'highlight-indentation)
;;; highlight-indentation.el ends here
|
