[patch] Formatting of {{{DATE}}}

[Rasmus <rasmus@gmx.us>]

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Hi,

I'd quite like to be able to pass a formatting argument to {{{date}}},
much like {{{time(FMT)}}}.  This patch allows this.  I think macros don't
normally have optional arguments, but I find it OK here since it's time
and modification-time works anyway...

On the other hand there might be a good reason that I have overlooked for
why this isn't already accepting a formatting argument.

Any objections?

—Rasmus

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From f8de6c716e892e159f80d40d91737ff8ac983877 Mon Sep 17 00:00:00 2001
From: Rasmus <rasmus@gmx.us>
Date: Sun, 8 Feb 2015 21:34:43 +0100
Subject: [PATCH 2/2] * ox.el: Allow {{{date}}} formatting

* ox.el (org-export-as): Allow {{{date}}} to take formatting-argument.

With optional argument, {{{date(FMT)}}} works like {{{time(FMT)}}} if
\#+DATE is a timestamp.
---
 lisp/ox.el | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/lisp/ox.el b/lisp/ox.el
index ad3742c..baaab6b 100644
--- a/lisp/ox.el
+++ b/lisp/ox.el
@@ -2872,7 +2872,18 @@ Return code as a string."
 	  (list (cons "author"
 		      (org-element-interpret-data (plist-get info :author)))
 		(cons "date"
-		      (org-element-interpret-data (plist-get info :date)))
+		      (let* ((date (plist-get info :date))
+			     (date-string (org-element-interpret-data date)))
+			;; Interpret only single time-stamps.
+			(case (and (not (cdr date))
+				   (org-element-type (car date)))
+			  (timestamp
+			   (format
+			    "(eval (if (org-element-property :args macro)
+				      (org-export-get-date info \"$1\")
+				    \"%s\"))"
+			    date-string))
+			  (t date-string))))
 		;; EMAIL is not a parsed keyword: store it as-is.
 		(cons "email" (or (plist-get info :email) ""))
 		(cons "title"
-- 
2.3.0