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
|
;;; linum.el --- display line numbers in the left margin
;; Copyright (C) 2008 Free Software Foundation, Inc.
;; Author: Markus Triska <markus.triska@gmx.at>
;; Maintainer: FSF
;; Keywords: convenience
;; 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, 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; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; Display line numbers for the current buffer.
;;
;; Toggle display of line numbers with M-x linum-mode. To enable
;; line numbering in all buffers, use M-x global-linum-mode.
;;; Code:
(defconst linum-version "0.9wx")
(defvar linum-overlays nil "Overlays used in this buffer.")
(defvar linum-available nil "Overlays available for reuse.")
(defvar linum-before-numbering-hook nil
"Functions run in each buffer before line numbering starts.")
(mapc #'make-variable-buffer-local '(linum-overlays linum-available))
(defgroup linum nil
"Show line numbers in the left margin."
:group 'convenience)
;;;###autoload
(defcustom linum-format 'dynamic
"Format used to display line numbers.
Either a format string like \"%7d\", `dynamic' to adapt the width
as needed, or a function that is called with a line number as its
argument and should evaluate to a string to be shown on that line.
See also `linum-before-numbering-hook'."
:group 'linum
:type 'sexp)
(defface linum
'((t :inherit shadow))
"Face for displaying line numbers in the display margin."
:group 'linum)
(defcustom linum-eager t
"Whether line numbers should be updated after each command.
The conservative setting `nil' might miss some buffer changes,
and you have to scroll or press \\[recenter-top-bottom] to update the numbers."
:group 'linum
:type 'boolean)
(defcustom linum-delay t
"Delay updates to give Emacs a chance for other changes."
:group 'linum
:type 'boolean)
;;;###autoload
(define-minor-mode linum-mode
"Toggle display of line numbers in the left margin."
:lighter "" ; for desktop.el
(if linum-mode
(progn
(if linum-eager
(add-hook 'post-command-hook (if linum-delay
'linum-schedule
'linum-update-current) nil t)
(add-hook 'after-change-functions 'linum-after-change nil t))
(add-hook 'window-scroll-functions 'linum-after-scroll nil t)
;; mistake in Emacs: window-size-change-functions cannot be local
(add-hook 'window-size-change-functions 'linum-after-size)
(add-hook 'change-major-mode-hook 'linum-delete-overlays nil t)
(add-hook 'window-configuration-change-hook
'linum-after-config nil t)
(linum-update-current))
(remove-hook 'post-command-hook 'linum-update-current t)
(remove-hook 'post-command-hook 'linum-schedule t)
(remove-hook 'window-size-change-functions 'linum-after-size)
(remove-hook 'window-scroll-functions 'linum-after-scroll t)
(remove-hook 'after-change-functions 'linum-after-change t)
(remove-hook 'window-configuration-change-hook 'linum-after-config t)
(remove-hook 'change-major-mode-hook 'linum-delete-overlays t)
(linum-delete-overlays)))
;;;###autoload
(define-globalized-minor-mode global-linum-mode linum-mode linum-on)
(defun linum-on ()
(unless (minibufferp)
(linum-mode 1)))
(defun linum-delete-overlays ()
"Delete all overlays displaying line numbers for this buffer."
(mapc #'delete-overlay linum-overlays)
(setq linum-overlays nil)
(dolist (w (get-buffer-window-list (current-buffer) nil t))
(set-window-margins w 0)))
(defun linum-update-current ()
"Update line numbers for the current buffer."
(linum-update (current-buffer)))
(defun linum-update (buffer)
"Update line numbers for all windows displaying BUFFER."
(with-current-buffer buffer
(when linum-mode
(setq linum-available linum-overlays)
(setq linum-overlays nil)
(save-excursion
(mapc #'linum-update-window
(get-buffer-window-list buffer nil 'visible)))
(mapc #'delete-overlay linum-available)
(setq linum-available nil))))
(defun linum-update-window (win)
"Update line numbers for the portion visible in window WIN."
(goto-char (window-start win))
(let ((line (line-number-at-pos))
(limit (1+ (window-end win t)))
(fmt (cond ((stringp linum-format) linum-format)
((eq linum-format 'dynamic)
(let ((w (length (number-to-string
(count-lines (point-min) (point-max))))))
(concat "%" (number-to-string w) "d")))))
(width 0)
visited
ov)
(run-hooks 'linum-before-numbering-hook)
;; Create an overlay (or reuse an existing one) for each
;; line visible in this window, if necessary.
(while (and (not (eobp)) (< (point) limit))
(setq visited nil)
(dolist (o (overlays-in (point) (point)))
(when (eq (overlay-get o 'linum-line) line)
(unless (memq o linum-overlays)
(push o linum-overlays))
(setq linum-available (delete o linum-available))
(setq visited t)))
(let ((str (if fmt
(propertize (format fmt line) 'face 'linum)
(funcall linum-format line))))
(setq width (max width (length str)))
(unless visited
(if (null linum-available)
(setq ov (make-overlay (point) (point)))
(setq ov (pop linum-available))
(move-overlay ov (point) (point)))
(push ov linum-overlays)
(setq str (propertize " " 'display `((margin left-margin) ,str)))
(overlay-put ov 'before-string str)
(overlay-put ov 'linum-line line)))
(forward-line)
(setq line (1+ line)))
(set-window-margins win width)))
(defun linum-after-change (beg end len)
;; update overlays on deletions, and after newlines are inserted
(when (or (= beg end)
(= end (point-max))
(string-match-p "\n" (buffer-substring-no-properties beg end)))
(linum-update-current)))
(defun linum-after-scroll (win start)
(linum-update (window-buffer win)))
(defun linum-after-size (frame)
(linum-after-config))
(defun linum-schedule ()
;; schedule an update; the delay gives Emacs a chance for display changes
(run-with-idle-timer 0 nil #'linum-update-current))
(defun linum-after-config ()
(walk-windows (lambda (w) (linum-update (window-buffer))) nil 'visible))
(provide 'linum)
;; arch-tag: dea45631-ed3c-4867-8b49-1c41c80aec6a
;;; linum.el ends here
|
