Add org-agenda-todo-ignore-timestamp

* lisp/org-agenda.el: Add org-agenda-todo-ignore-timestamp.
(org-agenda-check-for-timestamp-as-reason-to-ignore-todo-item):
Honor org-agenda-todo-ignore-timestamp.
* doc/org.texi: Mention org-agenda-todo-ignore-timestamp.

Signed-off-by: Julien Danjou <julien@danjou.info>

doc/org.texi

@@ -7120,13 +7120,15 @@ it more compact:
 @item
 @vindex org-agenda-todo-ignore-scheduled
 @vindex org-agenda-todo-ignore-deadlines
+@vindex org-agenda-todo-ignore-timestamp
 @vindex org-agenda-todo-ignore-with-date
 Some people view a TODO item that has been @emph{scheduled} for execution or
 have a @emph{deadline} (@pxref{Timestamps}) as no longer @emph{open}.
 Configure the variables @code{org-agenda-todo-ignore-scheduled},
-@code{org-agenda-todo-ignore-deadlines}, and/or
-@code{org-agenda-todo-ignore-with-date} to exclude such items from the
-global TODO list.
+@code{org-agenda-todo-ignore-deadlines},
+@code{org-agenda-todo-ignore-timestamp} and/or
+@code{org-agenda-todo-ignore-with-date} to exclude such items from the global
+TODO list.
 @item
 @vindex org-agenda-todo-list-sublevels
 TODO items may have sublevels to break up the task into subtasks.  In

lisp/org-agenda.el

@@ -562,6 +562,33 @@ See also the variable `org-agenda-tags-todo-honor-ignore-options'."
   :group 'org-agenda-todo-list
   :type 'boolean)
 
+(defcustom org-agenda-todo-ignore-timestamp nil
+  "Non-nil means don't show entries with a timestamp.
+This applies when creating the global todo list.
+Valid values are:
+
+past     Don't show entries for today or in the past.
+
+future   Don't show entries with a timestamp in the future.
+         The idea behind this is that if it has a future
+         timestamp, you don't want to think about it until the
+         date.
+
+all      Don't show any entries with a timestamp in the global todo list.
+         The idea behind this is that by setting a timestamp, you
+         have already \"taken care\" of this item.
+
+See also `org-agenda-todo-ignore-with-date'.
+See also the variable `org-agenda-tags-todo-honor-ignore-options' if you want
+to make his option also apply to the tags-todo list."
+  :group 'org-agenda-skip
+  :group 'org-agenda-todo-list
+  :type '(choice
+	  (const :tag "Ignore future timestamp todos" future)
+	  (const :tag "Ignore past or present timestamp todos" past)
+	  (const :tag "Ignore all timestamp todos" all)
+	  (const :tag "Show timestamp todos" nil)))
+
 (defcustom org-agenda-todo-ignore-scheduled nil
   "Non-nil means, ignore some scheduled TODO items when making TODO list.
 This applies when creating the global todo list.
@@ -632,7 +659,8 @@ to make his option also apply to the tags-todo list."
   "Non-nil means honor todo-list ...ignore options also in tags-todo search.
 The variables
    `org-agenda-todo-ignore-with-date',
-   `org-agenda-todo-ignore-scheduled'
+   `org-agenda-todo-ignore-timestamp',
+   `org-agenda-todo-ignore-scheduled',
    `org-agenda-todo-ignore-deadlines'
 make the global TODO list skip entries that have time stamps of certain
 kinds.  If this option is set, the same options will also apply for the
@@ -4435,7 +4463,8 @@ the documentation of `org-diary'."
   "Do we have a reason to ignore this TODO entry because it has a time stamp?"
   (when (or org-agenda-todo-ignore-with-date
 	    org-agenda-todo-ignore-scheduled
-	    org-agenda-todo-ignore-deadlines)
+	    org-agenda-todo-ignore-deadlines
+	    org-agenda-todo-ignore-timestamp)
     (setq end (or end (save-excursion (outline-next-heading) (point))))
     (save-excursion
       (or (and org-agenda-todo-ignore-with-date
@@ -4458,7 +4487,29 @@ the documentation of `org-diary'."
 		 (> (org-days-to-time (match-string 1)) 0))
 		((eq org-agenda-todo-ignore-deadlines 'past)
 		 (<= (org-days-to-time (match-string 1)) 0))
-		(t (org-deadline-close (match-string 1)))))))))
+		(t (org-deadline-close (match-string 1)))))
+	  (and org-agenda-todo-ignore-timestamp
+	       (let ((buffer (current-buffer))
+		     (regexp
+		      (concat
+		       org-scheduled-time-regexp "\\|" org-deadline-time-regexp))
+		     (start (point)))
+		 ;; Copy current buffer into a temporary one
+		 (with-temp-buffer
+		   (insert-buffer-substring buffer start end)
+		   (goto-char (point-min))
+		   ;; Delete SCHEDULED and DEADLINE items
+		   (while (re-search-forward regexp end t)
+		     (delete-region (match-beginning 0) (match-end 0)))
+		   (goto-char (point-min))
+		   ;; No search for timestamp left
+		   (when (re-search-forward org-ts-regexp nil t)
+		     (cond
+		      ((eq org-agenda-todo-ignore-timestamp 'future)
+		       (> (org-days-to-time (match-string 1)) 0))
+		      ((eq org-agenda-todo-ignore-timestamp 'past)
+		       (<= (org-days-to-time (match-string 1)) 0))
+		      (t))))))))))
 
 (defconst org-agenda-no-heading-message
   "No heading for this item in buffer or region.")