在组织模式的议程中显示空闲时间

我想轻松地在组织模式议程中找到空闲时间。

例如，如果我有两个约会，一个是9:30 am-10:30am，另一个是11:15 am-12:30pm，那么我想一眼就知道10:30 am-11:15am是免费的。

换句话说，我希望能够像在Google日历之类的图形议程中一样轻松地区分空闲时间。

有没有一种方法可以使空的时间段容易看清？也许要对超过给定分钟数的空块着色？

由于我自己的这个问题，我查看了org-agenda-add-time-grid-maybe创建时间网格的函数。如果OP注释中要求的时间很忙，则此处张贴的代码（不是我写的）确实会删除网格线。

像您一样，我想以某种方式创建可视块。通过将org-agenda-add-time-grid-maybeMichael Ekstrand 的原始代码和defadvice 混合在另一个线程中，我得出了的以下代码org-agenda-add-time-grid-maybe。它将以不同的颜色输出网格线（在我使用face的那一刻org-archived），时间后面将跟随一个不同的字符串。两者都可以根据您的喜好进行更改。

(defun org-agenda-add-time-grid-maybe (list ndays todayp)
  "Add a time-grid for agenda items which need it.

LIST is the list of agenda items formatted by `org-agenda-list'.
NDAYS is the span of the current agenda view.
TODAYP is t when the current agenda view is on today."

  (catch 'exit
   (cond ((not org-agenda-use-time-grid) (throw 'exit list))
         ((and todayp (member 'today (car org-agenda-time-grid))))
         ((and (= ndays 1) (member 'daily (car org-agenda-time-grid))))
         ((member 'weekly (car org-agenda-time-grid)))
         (t (throw 'exit list)))
   (let* ((blocks (mapcar (lambda (x)
                            (let ((start (get-text-property 1 'time-of-day x))
                                  (dur (get-text-property 1 'duration x)))
                              (cond
                               ((and start dur) (cons start
                                                      (org-time-from-minutes
                                                       (truncate
                                                        (+ dur (org-time-to-minutes start))))))
                               (start start)
                               (t nil))))
                          list))
          (have (delq nil (mapcar
                           (lambda (x) (get-text-property 1 'time-of-day x))
                           list)))
          (string (nth 3 org-agenda-time-grid))
          (gridtimes (nth 1 org-agenda-time-grid))
          (req (car org-agenda-time-grid))
          (remove (member 'remove-match req))
          new time)
     (if (and (member 'require-timed req) (not have))
         ;; don't show empty grid
         (throw 'exit list))

     (while (setq time (pop gridtimes))
       (unless (and remove (member time have))
         (let* ((windows (delq nil blocks))
                (hit nil))
           (dolist (busy windows)
             (unless hit
               (when (and (>= time (car busy))
                          (< time (cdr busy)))
                 (setq hit t))))
           (setq time (replace-regexp-in-string " " "0" (format "%04s" time)))
           (if hit
               (progn
                 (push (org-agenda-format-item
                        (concat string " dito") string nil "" nil
                        (concat (substring time 0 -2) ":" (substring time -2)))
                       new)
                 (put-text-property 2 (length (car new)) 'face 'org-archived (car new)))
             (progn
               (push (org-agenda-format-item
                      nil string nil "" nil
                      (concat (substring time 0 -2) ":" (substring time -2)))
                     new)
               (put-text-property 2 (length (car new)) 'face 'org-time-grid (car new))))
           (setq hit nil))))

     (when (and todayp org-agenda-show-current-time-in-grid)
       (push (org-agenda-format-item
              nil org-agenda-current-time-string nil "" nil
              (format-time-string "%H:%M "))
             new)
       (put-text-property
        2 (length (car new)) 'face 'org-agenda-current-time (car new)))

     (if (member 'time-up org-agenda-sorting-strategy-selected)
         (append new list)
       (append list new)))))

(defun org-time-to-minutes (time)
  "Convert an HHMM TIME to minutes."
  (+ (* (/ time 100) 60) (% time 100)))

(defun org-time-from-minutes (minutes)
  "Convert a number of MINUTES to an HHMM time."
  (+ (* (/ minutes 60) 100) (% minutes 60)))

显然，使用defadvice会更优雅，但是我无法弄清楚应该在哪里进行干预。函数本身会遍历每个网格时间（在中设置org-agenda-time-grid），并创建一个包含最终网格（包括面）的新列表（新）。