[PATCH] Export overlay specification for beamer notes

[Jamie Forth <j.forth@gold.ac.uk>]

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Hi,

Sometime I find it useful to align Beamer notes with slide overlays, for
example, when stepping through a worked example (see attachment).

Beamer permits notes to have overlay specifications but presently these
are not exported by org.

--
Jamie Forth




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From 5faeaf613b3eb8f687ca2a2addfce974d588fafe Mon Sep 17 00:00:00 2001
From: Jamie Forth <j.forth@gold.ac.uk>
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 relevant note for each step.

TINYCHANGE
---
 lisp/ox-beamer.el | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 05894ffab..7811dd6b5 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


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#+startup: beamer
#+beamer_theme: Singapore
#+beamer_header: \usepackage{pgfpages}
#+beamer_header: \setbeameroption{show notes on second screen=right}
#+options: toc:nil H:2

* Section 1
** Slide 1
*** Step 1                                                        :B_onlyenv:
:PROPERTIES:
:BEAMER_ACT: <+>
:BEAMER_env: onlyenv
:END:
**** Foo
- a
- b

**** Step 1 note                                                     :B_note:
:PROPERTIES:
:BEAMER_env: note
:BEAMER_ACT: <.>
:END:
- qux

*** Step 2                                                        :B_onlyenv:
:PROPERTIES:
:BEAMER_ACT: <+>
:BEAMER_env: onlyenv
:END:
**** Bar
- c
- d

**** Step 2 note                                                     :B_note:
:PROPERTIES:
:BEAMER_env: note
:BEAMER_ACT: <.>
:END:
- qux

# Local Variables:
# org-beamer-environments-extra: (("onlyenv" "O" "\\begin{onlyenv}%a" "\\end{onlyenv}"))
# End: