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lisp/ox-beamer.el: customize the beamer frame environment name
* lisp/ox-beamer.el (org-beamer-frame-environment): A new customize variable. It contains the name of an environment that serves as an alias for the beamer frame environment. (org-beamer-template): Insert the `org-beamer-frame-environment' environment definition into the beamer document. * lisp/org-lint.el (org-lint-beamer-frame): Check the body of each frame for an occurrence of \begin{orgframe} or \end{orgframe}, or whatever environment name is in `org-beamer-frame-environment' [4]. The warning includes advice to see `org-beamer-frame-environment'. * etc/ORG-NEWS (New option ~org-beamer-frame-environment~): Announce the new option. Rationale: Code with \begin{frame} or \end{frame} cannot be embedded in a verbatim environment inside a beamer frame due to a design decision made by the beamer developers [1]. As suggested in that report, defining an alias for the beamer frame environment will allow such verbatim examples to compile correctly [2]. This solution also works with instances of \againframe. Refs: [1] https://github.com/josephwright/beamer/issues/360 [2] https://github.com/josephwright/beamer/issues/360#issuecomment-708705250 [3] https://list.orgmode.org/orgmode/87le8eg1hs.fsf@localhost/T/ [4] https://list.orgmode.org/orgmode/87il38i5tb.fsf@localhost/T/
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etc/ORG-NEWS
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etc/ORG-NEWS
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@ -539,6 +539,22 @@ The change is breaking when ~org-use-property-inheritance~ is set to ~t~.
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The =TEST= parameter is better served by Emacs debugging tools.
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** New and changed options
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*** New option ~org-beamer-frame-environment~
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The new option defines name of an alternative environment to be used
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for fragile beamer frames. This option is needed to work around
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beamer bug with frame contents containing literal =\end{frame}= string
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(for example, inside example blocks). See
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https://github.com/josephwright/beamer/issues/360
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The default value is =orgframe=.
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The option should normally not be changed, except when you need to put
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=\end{orgframe}= string inside beamer frames.
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A checker has been added to =M-x org-lint= to detect instances of
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~org-beamer-frame-environment~ in Org documents.
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*** New option ~org-export-process-citations~
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The new option controls whether to use citation processors to process
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@ -1507,6 +1507,19 @@ AST is the buffer parse tree."
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((memq (org-element-property :type deadline) '(inactive inactive-range))
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(list (org-element-begin planning) "Inactive timestamp in DEADLINE will not appear in agenda."))
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(t nil))))))
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(defvar org-beamer-frame-environment) ; defined in ox-beamer.el
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(defun org-lint-beamer-frame (ast)
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"Check for occurrences of begin or end frame."
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(require 'ox-beamer)
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(org-with-point-at ast
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(goto-char (point-min))
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(let (result)
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(while (re-search-forward
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(concat "\\\\\\(begin\\|end\\){" org-beamer-frame-environment "}") nil t)
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(push (list (match-beginning 0) "Beamer frame name may cause error when exporting. Consider customizing `org-beamer-frame-environment'.") result))
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result)))
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;;; Checkers declaration
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@ -1787,6 +1800,10 @@ AST is the buffer parse tree."
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"Report $ that might be treated as LaTeX fragment boundary."
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#'org-lint-LaTeX-$-ambiguous
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:categories '(markup) :trust 'low)
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(org-lint-add-checker 'beamer-frame
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"Report that frame text contains beamer frame environment."
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#'org-lint-beamer-frame
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:categories '(export) :trust 'low)
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(org-lint-add-checker 'timestamp-syntax
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"Report malformed timestamps."
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#'org-lint-timestamp-syntax
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@ -148,6 +148,22 @@ which is replaced with the subtitle."
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:package-version '(Org . "8.3")
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:type '(string :tag "Format string"))
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(defcustom org-beamer-frame-environment "orgframe"
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"Name of the alternative beamer frame environment.
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In frames marked as fragile, this environment is used in place of
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the usual frame environment.
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This permits insertion of a beamer frame inside example blocks,
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working around beamer limitations. See
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https://list.orgmode.org/87a5nux3zr.fsf@t14.reltub.ca/T/#mc7221e93f138bdd56c916b194b9230d3a6c3de09
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This option may need to be changed when \"\\end{orgframe}\" string is
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used inside beamer slides."
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:group 'org-export-beamer
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:package-version '(Org . "9.7")
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:type '(string :tag "Beamer frame")
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:safe (lambda (str) (string-match-p "^[A-Za-z]+$" str)))
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;;; Internal Variables
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@ -408,12 +424,14 @@ used as a communication channel."
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"Format HEADLINE as a frame.
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CONTENTS holds the contents of the headline. INFO is a plist
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used as a communication channel."
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(let ((fragilep
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;; FRAGILEP is non-nil when HEADLINE contains an element
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;; among `org-beamer-verbatim-elements'.
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(org-element-map headline org-beamer-verbatim-elements 'identity
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info 'first-match)))
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(concat "\\begin{frame}"
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(let* ((fragilep
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;; FRAGILEP is non-nil when HEADLINE contains an element
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;; among `org-beamer-verbatim-elements'.
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(org-element-map headline org-beamer-verbatim-elements 'identity
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info 'first-match))
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(frame (or (and fragilep org-beamer-frame-environment)
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"frame")))
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(concat "\\begin{" frame "}"
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;; Overlay specification, if any. When surrounded by
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;; square brackets, consider it as a default
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;; specification.
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@ -480,7 +498,7 @@ used as a communication channel."
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;; output.
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(if (not fragilep) contents
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(replace-regexp-in-string "\\`\n*" "\\& " (or contents "")))
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"\\end{frame}")))
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"\\end{" frame "}")))
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(defun org-beamer--format-block (headline contents info)
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"Format HEADLINE as a block.
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@ -814,7 +832,6 @@ contextual information."
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(org-export-get-reference radio-target info)
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text))
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;;;; Template
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;;
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;; Template used is similar to the one used in `latex' backend,
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@ -834,6 +851,9 @@ holding export options."
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(org-latex--insert-compiler info)
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;; Document class and packages.
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(org-latex-make-preamble info)
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;; Define the alternative frame environment.
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(format "\\newenvironment<>{%s}[1][]{\\begin{frame}[environment=%1$s,#1]}{\\end{frame}}\n"
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org-beamer-frame-environment)
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;; Insert themes.
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(let ((format-theme
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(lambda (prop command)
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