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
254
255
256
257
258
259
|
;;; column-marker.el --- Highlight certain character columns
;;
;; Filename: column-marker.el
;; Description: Highlight certain character columns
;; Author: Rick Bielawski <rbielaws@i1.net>
;; Maintainer: Rick Bielawski <rbielaws@i1.net>
;; Created: Tue Nov 22 10:26:03 2005
;; Version:
;; Last-Updated: Fri Jan 22 11:28:48 2010 (-0800)
;; By: dradams
;; Update #: 312
;; Keywords: tools convenience highlight
;; Compatibility: GNU Emacs 21, GNU Emacs 22, GNU Emacs 23
;;
;; Features that might be required by this library:
;;
;; None
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Commentary:
;;
;; Highlights the background at a given character column.
;;
;; Commands `column-marker-1', `column-marker-2', and
;; `column-marker-3' each highlight a given column (using different
;; background colors, by default).
;;
;; - With no prefix argument, each highlights the current column
;; (where the cursor is).
;;
;; - With a non-negative numeric prefix argument, each highlights that
;; column.
;;
;; - With plain `C-u' (no number), each turns off its highlighting.
;;
;; - With `C-u C-u', each turns off all column highlighting.
;;
;; If two commands highlight the same column, the last-issued
;; highlighting command shadows the other - only the last-issued
;; highlighting is seen. If that "topmost" highlighting is then
;; turned off, the other highlighting for that column then shows
;; through.
;;
;; Examples:
;;
;; M-x column-marker-1 highlights the column where the cursor is, in
;; face `column-marker-1'.
;;
;; C-u 70 M-x column-marker-2 highlights column 70 in face
;; `column-marker-2'.
;;
;; C-u 70 M-x column-marker-3 highlights column 70 in face
;; `column-marker-3'. The face `column-marker-2' highlighting no
;; longer shows.
;;
;; C-u M-x column-marker-3 turns off highlighting for column-marker-3,
;; so face `column-marker-2' highlighting shows again for column 70.
;;
;; C-u C-u M-x column-marker-1 (or -2 or -3) erases all column
;; highlighting.
;;
;; These commands use `font-lock-fontify-buffer', so syntax
;; highlighting (`font-lock-mode') must be turned on. There might be
;; a performance impact during refontification.
;;
;;
;; Installation: Place this file on your load path, and put this in
;; your init file (`.emacs'):
;;
;; (require 'column-marker)
;;
;; Other init file suggestions (examples):
;;
;; ;; Highlight column 80 in foo mode.
;; (add-hook 'foo-mode-hook (lambda () (interactive) (column-marker-1 80)))
;;
;; ;; Use `C-c m' interactively to highlight with face `column-marker-1'.
;; (global-set-key [?\C-c ?m] 'column-marker-1)
;;
;;
;; Please report any bugs!
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Change log:
;;
;; 2009/12/10 dadams
;; column-marker-internal: Quote the face. Thx to Johan Bockgård.
;; 2009/12/09 dadams
;; column-marker-find: fset a symbol to the function, and return the symbol.
;; 2008/01/21 dadams
;; Renamed faces by dropping suffix "-face".
;; 2006/08/18 dadams
;; column-marker-create: Add newlines to doc-string sentences.
;; 2005/12/31 dadams
;; column-marker-create: Add marker to column-marker-vars inside the defun,
;; so it is done in the right buffer, updating column-marker-vars buffer-locally.
;; column-marker-find: Corrected comment. Changed or to progn for clarity.
;; 2005/12/29 dadams
;; Updated wrt new version of column-marker.el (multi-column characters).
;; Corrected stray occurrences of column-marker-here to column-marker-1.
;; column-marker-vars: Added make-local-variable.
;; column-marker-create: Changed positive to non-negative.
;; column-marker-internal: Turn off marker when col is negative, not < 1.
;; 2005-12-29 RGB
;; column-marker.el now supports multi-column characters.
;; 2005/11/21 dadams
;; Combined static and dynamic.
;; Use separate faces for each marker. Different interactive spec.
;; 2005/10/19 RGB
;; Initial release of column-marker.el.
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; 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, 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.
;; You should have received a copy of the GNU General Public License
;; along with this program; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth
;; Floor, Boston, MA 02110-1301, USA.
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Code:
;;;;;;;;;;;;;;;;;;;;;;
(defface column-marker-1 '((t (:background "gray")))
"Face used for a column marker. Usually a background color."
:group 'faces)
(defvar column-marker-1-face 'column-marker-1
"Face used for a column marker. Usually a background color.
Changing this directly affects only new markers.")
(defface column-marker-2 '((t (:background "cyan3")))
"Face used for a column marker. Usually a background color."
:group 'faces)
(defvar column-marker-2-face 'column-marker-2
"Face used for a column marker. Usually a background color.
Changing this directly affects only new markers." )
(defface column-marker-3 '((t (:background "orchid3")))
"Face used for a column marker. Usually a background color."
:group 'faces)
(defvar column-marker-3-face 'column-marker-3
"Face used for a column marker. Usually a background color.
Changing this directly affects only new markers." )
(defvar column-marker-vars ()
"List of all internal column-marker variables")
(make-variable-buffer-local 'column-marker-vars) ; Buffer local in all buffers.
(defmacro column-marker-create (var &optional face)
"Define a column marker named VAR.
FACE is the face to use. If nil, then face `column-marker-1' is used."
(setq face (or face 'column-marker-1))
`(progn
;; define context variable ,VAR so marker can be removed if desired
(defvar ,var ()
"Buffer local. Used internally to store column marker spec.")
;; context must be buffer local since font-lock is
(make-variable-buffer-local ',var)
;; Define wrapper function named ,VAR to call `column-marker-internal'
(defun ,var (arg)
,(concat "Highlight column with face `" (symbol-name face)
"'.\nWith no prefix argument, highlight current column.\n"
"With non-negative numeric prefix arg, highlight that column number.\n"
"With plain `C-u' (no number), turn off this column marker.\n"
"With `C-u C-u' or negative prefix arg, turn off all column-marker highlighting.")
(interactive "P")
(unless (memq ',var column-marker-vars) (push ',var column-marker-vars))
(cond ((null arg) ; Default: highlight current column.
(column-marker-internal ',var (1+ (current-column)) ,face))
((consp arg)
(if (= 4 (car arg))
(column-marker-internal ',var nil) ; `C-u': Remove this column highlighting.
(dolist (var column-marker-vars)
(column-marker-internal var nil)))) ; `C-u C-u': Remove all column highlighting.
((and (integerp arg) (>= arg 0)) ; `C-u 70': Highlight that column.
(column-marker-internal ',var (1+ (prefix-numeric-value arg)) ,face))
(t ; `C-u -40': Remove all column highlighting.
(dolist (var column-marker-vars)
(column-marker-internal var nil)))))))
(defun column-marker-find (col)
"Defines a function to locate a character in column COL.
Returns the function symbol, named `column-marker-move-to-COL'."
(let ((fn-symb (intern (format "column-marker-move-to-%d" col))))
(fset `,fn-symb
`(lambda (end)
(let ((start (point)))
(when (> end (point-max)) (setq end (point-max)))
;; Try to keep `move-to-column' from going backward, though it still can.
(unless (< (current-column) ,col) (forward-line 1))
;; Again, don't go backward. Try to move to correct column.
(when (< (current-column) ,col) (move-to-column ,col))
;; If not at target column, try to move to it.
(while (and (< (current-column) ,col) (< (point) end)
(= 0 (+ (forward-line 1) (current-column)))) ; Should be bol.
(move-to-column ,col))
;; If at target column, not past end, and not prior to start,
;; then set match data and return t. Otherwise go to start
;; and return nil.
(if (and (= ,col (current-column)) (<= (point) end) (> (point) start))
(progn (set-match-data (list (1- (point)) (point)))
t) ; Return t.
(goto-char start)
nil)))) ; Return nil.
fn-symb))
(defun column-marker-internal (sym col &optional face)
"SYM is the symbol for holding the column marker context.
COL is the column in which a marker should be set.
Supplying nil or 0 for COL turns off the marker.
FACE is the face to use. If nil, then face `column-marker-1' is used."
(setq face (or face 'column-marker-1))
(when (symbol-value sym) ; Remove any previously set column marker
(font-lock-remove-keywords nil (symbol-value sym))
(set sym nil))
(when (or (listp col) (< col 0)) (setq col nil)) ; Allow nonsense stuff to turn off the marker
(when col ; Generate a new column marker
(set sym `((,(column-marker-find col) (0 ',face prepend t))))
(font-lock-add-keywords nil (symbol-value sym) t))
(font-lock-fontify-buffer))
;; If you need more markers you can create your own similarly.
;; All markers can be in use at once, and each is buffer-local,
;; so there is no good reason to define more unless you need more
;; markers in a single buffer.
(column-marker-create column-marker-1 column-marker-1-face)
(column-marker-create column-marker-2 column-marker-2-face)
(column-marker-create column-marker-3 column-marker-3-face)
;;;###autoload
(autoload 'column-marker-1 "column-marker" "Highlight a column." t)
;;;;;;;;;;;;;;;;;;
(provide 'column-marker)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; column-marker.el ends here
|