iankelling.org Git - spray/blob - spray.el

   1 (require 'face-remap)
   2
   3 ;; custom
   4 (defvar spray-wpm 400 "words/min")
   5 (defvar spray-height 400 "height of characters")
   6
   7 (make-face 'spray-base-face)
   8 (set-face-attribute 'spray-base-face nil
   9                     :background (face-background 'default)
  10                     :foreground (face-foreground 'default))
  11
  12 (make-face 'spray-orp-face)
  13 (set-face-attribute 'spray-orp-face nil
  14                     :foreground "red"
  15                     :overline (face-foreground 'default)
  16                     :underline (face-foreground 'default))
  17
  18 ;; internal variables
  19 (defvar spray--base-overlay nil)
  20 (defvar spray--orp-overlay nil)
  21 (defvar spray--timer nil)
  22 (defvar spray--delay 0)
  23 (defvar spray--saved-cursor-type nil)
  24
  25 (define-minor-mode spray-mode
  26   "spray mode"
  27   :init nil
  28   :global nil
  29   (cond (spray-mode
  30          (let ((buffer-face-mode-face `(:height ,spray-height)))
  31            (buffer-face-mode 1))
  32          (setq spray--base-overlay (make-overlay (point-min) (point-max))
  33                spray--orp-overlay (make-overlay 0 0)
  34                spray--timer (run-with-timer 0 (/ 60.0 spray-wpm) 'spray-next)
  35                spray--saved-cursor-type cursor-type)
  36          (setq cursor-type nil)
  37          (overlay-put spray--base-overlay 'priority 100)
  38          (overlay-put spray--base-overlay 'face 'spray-base-face)
  39          (overlay-put spray--orp-overlay 'priority 101)
  40          (overlay-put spray--orp-overlay 'face 'spray-orp-face)
  41          (add-hook 'pre-command-hook 'turn-off-spray-mode))
  42         (t
  43          (buffer-face-mode -1)
  44          (widen)
  45          (setq cursor-type spray--saved-cursor-type)
  46          (delete-overlay spray--base-overlay)
  47          (delete-overlay spray--orp-overlay)
  48          (cancel-timer spray--timer)
  49          (remove-hook 'pre-command-hook 'turn-off-spray-mode))))
  50
  51 (defun turn-on-spray-mode () (interactive) (spray-mode 1))
  52 (defun turn-off-spray-mode () (interactive) (spray-mode -1))
  53
  54 (defun spray-next ()
  55   (cond ((not (zerop spray--delay))
  56          (setq spray--delay (1- spray--delay))
  57          (when (= spray--delay 2)
  58            (narrow-to-region (point) (point))))
  59         (t
  60          (widen)
  61          (if (eobp)
  62              (turn-off-spray-mode)
  63            (skip-chars-forward "\s\t\n")
  64            (let* ((beg (point))
  65                   (len (skip-chars-forward "^\s\t\n"))
  66                   (end (point))
  67                   (orp (+ beg (cl-case len
  68                                 ((1) 1)
  69                                 ((2 3 4 5) 2)
  70                                 ((6 7 8 9) 3)
  71                                 ((10 11 12 13) 4)
  72                                 (t 5)))))
  73              (setq spray--delay (+ (if (> len 9) 1 0)
  74                                    (if (eql (char-after) ?\n) 3 0)
  75                                    (cl-case (char-before)
  76                                      ((?. ?! ?\? ?\;) 3)
  77                                      ((?, ?:) 1)
  78                                      (t 0))))
  79              (move-overlay spray--orp-overlay (1- orp) orp)
  80              (move-overlay spray--base-overlay beg end)
  81              (overlay-put spray--base-overlay
  82                           'before-string (make-string (- 5 (- orp beg)) ?\s))
  83              (narrow-to-region beg end))))))
  84
  85 (provide 'spray)