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8e54981d JB |
1 | ;;; linum.el --- display line numbers in the left margin |
2 | ||
73b0cd50 | 3 | ;; Copyright (C) 2008-2011 Free Software Foundation, Inc. |
8e54981d JB |
4 | |
5 | ;; Author: Markus Triska <markus.triska@gmx.at> | |
6 | ;; Maintainer: FSF | |
7 | ;; Keywords: convenience | |
aad4679e | 8 | ;; Version: 0.9x |
8e54981d JB |
9 | |
10 | ;; This file is part of GNU Emacs. | |
11 | ||
12 | ;; GNU Emacs is free software: you can redistribute it and/or modify | |
13 | ;; it under the terms of the GNU General Public License as published by | |
14 | ;; the Free Software Foundation, either version 3 of the License, or | |
15 | ;; (at your option) any later version. | |
16 | ||
17 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;; GNU General Public License for more details. | |
21 | ||
22 | ;; You should have received a copy of the GNU General Public License | |
23 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. | |
24 | ||
25 | ;;; Commentary: | |
26 | ||
27 | ;; Display line numbers for the current buffer. | |
28 | ;; | |
29 | ;; Toggle display of line numbers with M-x linum-mode. To enable | |
30 | ;; line numbering in all buffers, use M-x global-linum-mode. | |
31 | ||
32 | ;;; Code: | |
33 | ||
34 | (defconst linum-version "0.9x") | |
35 | ||
36 | (defvar linum-overlays nil "Overlays used in this buffer.") | |
37 | (defvar linum-available nil "Overlays available for reuse.") | |
38 | (defvar linum-before-numbering-hook nil | |
39 | "Functions run in each buffer before line numbering starts.") | |
40 | ||
41 | (mapc #'make-variable-buffer-local '(linum-overlays linum-available)) | |
42 | ||
43 | (defgroup linum nil | |
44 | "Show line numbers in the left margin." | |
45 | :group 'convenience) | |
46 | ||
47 | ;;;###autoload | |
48 | (defcustom linum-format 'dynamic | |
49 | "Format used to display line numbers. | |
50 | Either a format string like \"%7d\", `dynamic' to adapt the width | |
51 | as needed, or a function that is called with a line number as its | |
52 | argument and should evaluate to a string to be shown on that line. | |
53 | See also `linum-before-numbering-hook'." | |
54 | :group 'linum | |
55 | :type 'sexp) | |
56 | ||
57 | (defface linum | |
58 | '((t :inherit (shadow default))) | |
59 | "Face for displaying line numbers in the display margin." | |
60 | :group 'linum) | |
61 | ||
62 | (defcustom linum-eager t | |
63 | "Whether line numbers should be updated after each command. | |
64 | The conservative setting `nil' might miss some buffer changes, | |
65 | and you have to scroll or press \\[recenter-top-bottom] to update the numbers." | |
66 | :group 'linum | |
67 | :type 'boolean) | |
68 | ||
69 | (defcustom linum-delay nil | |
70 | "Delay updates to give Emacs a chance for other changes." | |
71 | :group 'linum | |
72 | :type 'boolean) | |
73 | ||
74 | ;;;###autoload | |
75 | (define-minor-mode linum-mode | |
76 | "Toggle display of line numbers in the left margin." | |
77 | :lighter "" ; for desktop.el | |
78 | (if linum-mode | |
79 | (progn | |
80 | (if linum-eager | |
81 | (add-hook 'post-command-hook (if linum-delay | |
82 | 'linum-schedule | |
83 | 'linum-update-current) nil t) | |
84 | (add-hook 'after-change-functions 'linum-after-change nil t)) | |
85 | (add-hook 'window-scroll-functions 'linum-after-scroll nil t) | |
b932657b SM |
86 | ;; Using both window-size-change-functions and |
87 | ;; window-configuration-change-hook seems redundant. --Stef | |
88 | ;; (add-hook 'window-size-change-functions 'linum-after-size nil t) | |
8e54981d JB |
89 | (add-hook 'change-major-mode-hook 'linum-delete-overlays nil t) |
90 | (add-hook 'window-configuration-change-hook | |
b932657b SM |
91 | ;; FIXME: If the buffer is shown in N windows, this |
92 | ;; will be called N times rather than once. We should use | |
93 | ;; something like linum-update-window instead. | |
94 | 'linum-update-current nil t) | |
8e54981d JB |
95 | (linum-update-current)) |
96 | (remove-hook 'post-command-hook 'linum-update-current t) | |
97 | (remove-hook 'post-command-hook 'linum-schedule t) | |
b932657b | 98 | ;; (remove-hook 'window-size-change-functions 'linum-after-size t) |
8e54981d JB |
99 | (remove-hook 'window-scroll-functions 'linum-after-scroll t) |
100 | (remove-hook 'after-change-functions 'linum-after-change t) | |
b932657b | 101 | (remove-hook 'window-configuration-change-hook 'linum-update-current t) |
8e54981d JB |
102 | (remove-hook 'change-major-mode-hook 'linum-delete-overlays t) |
103 | (linum-delete-overlays))) | |
104 | ||
105 | ;;;###autoload | |
106 | (define-globalized-minor-mode global-linum-mode linum-mode linum-on) | |
107 | ||
108 | (defun linum-on () | |
109 | (unless (minibufferp) | |
110 | (linum-mode 1))) | |
111 | ||
112 | (defun linum-delete-overlays () | |
113 | "Delete all overlays displaying line numbers for this buffer." | |
114 | (mapc #'delete-overlay linum-overlays) | |
115 | (setq linum-overlays nil) | |
116 | (dolist (w (get-buffer-window-list (current-buffer) nil t)) | |
245be23c | 117 | (set-window-margins w 0 (cdr (window-margins w))))) |
8e54981d JB |
118 | |
119 | (defun linum-update-current () | |
120 | "Update line numbers for the current buffer." | |
121 | (linum-update (current-buffer))) | |
122 | ||
123 | (defun linum-update (buffer) | |
124 | "Update line numbers for all windows displaying BUFFER." | |
125 | (with-current-buffer buffer | |
126 | (when linum-mode | |
127 | (setq linum-available linum-overlays) | |
128 | (setq linum-overlays nil) | |
129 | (save-excursion | |
130 | (mapc #'linum-update-window | |
131 | (get-buffer-window-list buffer nil 'visible))) | |
132 | (mapc #'delete-overlay linum-available) | |
133 | (setq linum-available nil)))) | |
134 | ||
135 | (defun linum-update-window (win) | |
136 | "Update line numbers for the portion visible in window WIN." | |
137 | (goto-char (window-start win)) | |
138 | (let ((line (line-number-at-pos)) | |
139 | (limit (window-end win t)) | |
140 | (fmt (cond ((stringp linum-format) linum-format) | |
141 | ((eq linum-format 'dynamic) | |
142 | (let ((w (length (number-to-string | |
143 | (count-lines (point-min) (point-max)))))) | |
144 | (concat "%" (number-to-string w) "d"))))) | |
145 | (width 0)) | |
146 | (run-hooks 'linum-before-numbering-hook) | |
147 | ;; Create an overlay (or reuse an existing one) for each | |
148 | ;; line visible in this window, if necessary. | |
149 | (while (and (not (eobp)) (<= (point) limit)) | |
150 | (let* ((str (if fmt | |
151 | (propertize (format fmt line) 'face 'linum) | |
152 | (funcall linum-format line))) | |
153 | (visited (catch 'visited | |
154 | (dolist (o (overlays-in (point) (point))) | |
0ca77a92 JB |
155 | (when (equal-including-properties |
156 | (overlay-get o 'linum-str) str) | |
8e54981d JB |
157 | (unless (memq o linum-overlays) |
158 | (push o linum-overlays)) | |
0ca77a92 | 159 | (setq linum-available (delq o linum-available)) |
8e54981d JB |
160 | (throw 'visited t)))))) |
161 | (setq width (max width (length str))) | |
162 | (unless visited | |
163 | (let ((ov (if (null linum-available) | |
164 | (make-overlay (point) (point)) | |
165 | (move-overlay (pop linum-available) (point) (point))))) | |
166 | (push ov linum-overlays) | |
167 | (overlay-put ov 'before-string | |
168 | (propertize " " 'display `((margin left-margin) ,str))) | |
169 | (overlay-put ov 'linum-str str)))) | |
d204c46c SM |
170 | ;; Text may contain those nasty intangible properties, but that |
171 | ;; shouldn't prevent us from counting those lines. | |
172 | (let ((inhibit-point-motion-hooks t)) | |
173 | (forward-line)) | |
8e54981d | 174 | (setq line (1+ line))) |
245be23c | 175 | (set-window-margins win width (cdr (window-margins win))))) |
8e54981d JB |
176 | |
177 | (defun linum-after-change (beg end len) | |
178 | ;; update overlays on deletions, and after newlines are inserted | |
179 | (when (or (= beg end) | |
180 | (= end (point-max)) | |
181 | (string-match-p "\n" (buffer-substring-no-properties beg end))) | |
182 | (linum-update-current))) | |
183 | ||
184 | (defun linum-after-scroll (win start) | |
185 | (linum-update (window-buffer win))) | |
186 | ||
b932657b SM |
187 | ;; (defun linum-after-size (frame) |
188 | ;; (linum-after-config)) | |
8e54981d JB |
189 | |
190 | (defun linum-schedule () | |
191 | ;; schedule an update; the delay gives Emacs a chance for display changes | |
192 | (run-with-idle-timer 0 nil #'linum-update-current)) | |
193 | ||
b932657b SM |
194 | ;; (defun linum-after-config () |
195 | ;; (walk-windows (lambda (w) (linum-update (window-buffer w))) nil 'visible)) | |
8e54981d JB |
196 | |
197 | (defun linum-unload-function () | |
198 | "Unload the Linum library." | |
199 | (global-linum-mode -1) | |
200 | ;; continue standard unloading | |
201 | nil) | |
202 | ||
203 | (provide 'linum) | |
204 | ||
8e54981d | 205 | ;;; linum.el ends here |