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Lars Tveito 2015-05-12 00:48:09 +02:00
commit 02cec3494d
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focus-mode.el Normal file
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(defvar-local focus-pre-overlay nil)
(defvar-local focus-post-overlay nil)
(defun focus-hexstr-to-int (str)
(read (concat "#x" (substring str 1))))
(defun focus-average-colors (hstr1 hstr2 &rest hstrs)
(let* ((strs (cons hstr1 (cons hstr2 hstrs)))
(avg (/ (apply '+ (mapcar 'focus-hexstr-to-int strs)) 2)))
(format "#%X" avg)))
(defun focus-move-focus ()
(save-excursion
(let* ((pre (or (re-search-backward "^\n" nil t) 1))
(post (1- (or (re-search-forward "^\n" nil t 2)
(1+ (point-max))))))
(move-overlay focus-pre-overlay (point-min) pre)
(move-overlay focus-post-overlay post (point-max)))))
;;;###autoload
(define-minor-mode focus-mode
"Dim the font color text in surrounding paragraphs."
:init-value nil
(if (not focus-mode)
(progn (mapc 'delete-overlay (list focus-pre-overlay focus-post-overlay))
(remove-hook 'post-command-hook 'focus-move-focus t))
(setq focus-pre-overlay (make-overlay (point-min) (point-min))
focus-post-overlay (make-overlay (point-max) (point-max)))
(let ((color (focus-average-colors
(face-attribute 'default :foreground)
(face-attribute 'default :background))))
(mapc (lambda (o) (overlay-put o 'face (cons 'foreground-color color)))
(list focus-pre-overlay focus-post-overlay)))
(add-hook 'post-command-hook 'focus-move-focus nil t)))