>From d2ab748302a72879a348748fbb9d021b32bc3b0a Mon Sep 17 00:00:00 2001
From: Jamie Forth <address@hidden>
Date: Mon, 21 Jan 2019 18:01:13 +0000
Subject: [PATCH] lisp/ox-beamer.el: Export overlay specification for notes

* ox-beamer.el (org-beamer-headline): Pass overlay specification to
beamer `\note{}' command.

This is useful for animating multiple slides within a single frame and
displaying only the relevant note(s) for each slide.

TINYCHANGE
---
 etc/ORG-NEWS      |  2 ++
 lisp/ox-beamer.el | 23 ++++++++++++++++-------
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index e06d0c09b..d1b247ab9 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -105,6 +105,8 @@ matches the same structures than 'latex but it calls
 org-src-font-lock-fontify-block instead, thus bringing about full
 LaTeX font locking.
 
+*** Export Beamer overlay specification for notes
+
 ** New functions
 *** ~org-dynamic-block-insert-dblock~
 
diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 05894ffab..eaff3ca53 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -645,13 +645,22 @@ as a communication channel."
 		contents))
        ;; Case 4: HEADLINE is a note.
        ((member environment '("note" "noteNH"))
-	(format "\\note{%s}"
-		(concat (and (equal environment "note")
-			     (concat
-			      (org-export-data
-			       (org-element-property :title headline) info)
-			      "\n"))
-			(org-trim contents))))
+	(concat "\\note"
+		;; Overlay specification.
+		(let ((overlay (org-element-property :BEAMER_ACT headline)))
+		  (when overlay
+		    (org-beamer--normalize-argument
+		     overlay
+		     (if (string-match "\\`\\[.*\\]\\'" overlay)
+			 'defaction 'action))))
+		(format "{%s}"
+			(concat (and (equal environment "note")
+				     (concat
+				      (org-export-data
+				       (org-element-property :title headline)
+				       info)
+				      "\n"))
+				(org-trim contents)))))
        ;; Case 5: HEADLINE is a frame.
        ((= level frame-level)
 	(org-beamer--format-frame headline contents info))
-- 
2.20.1