branch: externals/org
commit 80615195c4ff6ee79638e4006487fafb48e815eb
Author: Leo Butler <leo.but...@umanitoba.ca>
Commit: Ihor Radchenko <yanta...@posteo.net>
lisp/ox-beamer.el: constrain use of org-beamer-frame-environment
* lisp/ox-beamer.el (org-beamer--format-frame, org-beamer-template):
Only use `org-beamer-frame-environment' when a frame is marked as
fragile and the frame's contents include either \begin{frame} or
\end{frame}. When `org-beamer-frame-environment' is used and not
equal to "frame", add the property :beamer-define-frame to INFO and
set it to t. When that property is t, `org-beamer-template' emits a
definition of the alternative frame environment.
Refs: https://list.orgmode.org/orgmode/87bk7jeik8.fsf@localhost/
https://list.orgmode.org/87a5nux3zr....@t14.reltub.ca/T/
---
lisp/ox-beamer.el | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
diff --git a/lisp/ox-beamer.el b/lisp/ox-beamer.el
index 4fad37b59f..8bae93c11d 100644
--- a/lisp/ox-beamer.el
+++ b/lisp/ox-beamer.el
@@ -429,8 +429,21 @@ used as a communication channel."
;; among `org-beamer-verbatim-elements'.
(org-element-map headline org-beamer-verbatim-elements 'identity
info 'first-match))
- (frame (or (and fragilep org-beamer-frame-environment)
- "frame")))
+ ;; If FRAGILEP is non-nil and CONTENTS contains an occurrence
+ ;; of \begin{frame} or \end{frame}, then set the FRAME
+ ;; environment to be `org-beamer-frame-environment';
+ ;; otherwise, use "frame". If the selected environment is not
+ ;; "frame", then add the property :beamer-define-frame to
+ ;; INFO and set it to t.
+ (frame (let ((selection
+ (or (and fragilep
+ (or (string-match-p "\\\\begin{frame}"
contents)
+ (string-match-p "\\\\end{frame}" contents))
+ org-beamer-frame-environment)
+ "frame")))
+ (unless (string= selection "frame")
+ (setq info (plist-put info :beamer-define-frame t)))
+ selection)))
(concat "\\begin{" frame "}"
;; Overlay specification, if any. When surrounded by
;; square brackets, consider it as a default
@@ -851,8 +864,8 @@ holding export options."
(org-latex--insert-compiler info)
;; Document class and packages.
(org-latex-make-preamble info)
- ;; Define the alternative frame environment.
- (unless (equal "frame" org-beamer-frame-environment)
+ ;; Define the alternative frame environment, if needed.
+ (when (plist-get info :beamer-define-frame)
(format
"\\newenvironment<>{%s}[1][]{\\begin{frame}#2[environment=%1$s,#1]}{\\end{frame}}\n"
org-beamer-frame-environment))
;; Insert themes.
