Function: whitespace-post-command-hook

whitespace-post-command-hook is a byte-compiled function defined in whitespace.el.gz.

Signature

(whitespace-post-command-hook)

Documentation

Save current point into whitespace-point variable.

Also refontify when necessary.

Source Code

;; Defined in /usr/src/emacs/lisp/whitespace.el.gz
(defun whitespace-post-command-hook ()
  "Save current point into `whitespace-point' variable.
Also refontify when necessary."
  (unless (and (eq whitespace-point (point))
               (not whitespace-buffer-changed))
    (when (and (not whitespace-buffer-changed)
               (memq 'empty whitespace-active-style))
      ;; No need to handle the `whitespace-buffer-changed' case here
      ;; because that is taken care of by the `font-lock-multiline'
      ;; text property.
      (when (<= (min (point) whitespace-point) whitespace-bob-marker)
        (font-lock-flush 1 whitespace-bob-marker))
      (when (>= (max (point) whitespace-point) whitespace-eob-marker)
        (font-lock-flush whitespace-eob-marker (1+ (buffer-size)))))
    (setq-local whitespace-buffer-changed nil)
    (setq whitespace-point (point))	; current point position
    (let ((refontify (and (eolp) ; It is at end of line ...
                          ;; ... with trailing SPACE or TAB
                          (or (memq (preceding-char) '(?\s ?\t)))
                          (line-beginning-position)))
          (ostart (overlay-start whitespace-point--used)))
      (cond
       ((not refontify)
        ;; New point does not affect highlighting: just refresh the
        ;; highlighting of old point, if needed.
        (when ostart
          (font-lock-flush ostart
                           (overlay-end whitespace-point--used))
          (delete-overlay whitespace-point--used)))
       ((not ostart)
        ;; Old point did not affect highlighting, but new one does: refresh the
        ;; highlighting of new point.
        (font-lock-flush (min refontify (point)) (max refontify (point))))
       ((save-excursion
          (goto-char ostart)
          (setq ostart (line-beginning-position))
          (and (<= ostart (max refontify (point)))
               (progn
                 (goto-char (overlay-end whitespace-point--used))
                 (let ((oend (line-beginning-position 2)))
                   (<= (min refontify (point)) oend)))))
        ;; The old point highlighting and the new point highlighting
        ;; cover a contiguous region: do a single refresh.
        (font-lock-flush (min refontify (point) ostart)
                         (max refontify (point)
                              (overlay-end whitespace-point--used)))
        (delete-overlay whitespace-point--used))
       (t
        (font-lock-flush (min refontify (point))
                         (max refontify (point)))
        (font-lock-flush ostart (overlay-end whitespace-point--used))
        (delete-overlay whitespace-point--used))))))