blob: 079f4212f5aa61e0b62099446ee122823de70e66 (
plain)
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
|
;;; durand-align.el --- Pixel alignment -*- lexical-binding: t; -*-
;; Copyright (C) 2024 Jean Sévère Durand
;; Author: Jean Sévère Durand <durand@jsdurand.xyz>
;; Keywords: wp, faces
;; 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 3 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.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Some little functions to center buffer texts at pixel level
;; precision.
;;; Code:
(defun durand-center (&optional pixels)
"Center the buffer.
If PIXELS is not-nil, use that as body width in pixels."
(let* ((body-width (cond ((and pixels (numberp pixels) (> pixels 0))
pixels)
((car (window-text-pixel-size
nil
(cons (window-start) 0)
(window-end))))))
(len (floor (- (window-body-width nil t) body-width) 2))
(prop (list 'space :width (list len)))
(str (propertize (string 32) 'display prop 'durand-center t)))
(save-excursion
(goto-char (point-min))
(while (not (eobp))
(cond
((get-text-property (point) 'durand-center)
(put-text-property (point) (1+ (point)) 'display prop))
((insert str)))
(forward-line 1)))))
(defun durand-cancel-center ()
"Cancel the inserted characters."
(save-excursion
(goto-char (point-min))
(while (not (eobp))
(cond
((get-text-property (point) 'durand-center)
(delete-char 1)))
(forward-line 1))))
(provide 'durand-align)
;;; durand-align.el ends here
|
