The manual page "Environment of a Code Block" describes :prologue and
:epilogue header arguments, which are useful for applications like unit
tests and boilerplate code. No suggestion is made that these arguments
are only available for some languages.
In fact, any language that provides its own org-babel-expand-body needs
special code to handle these arguments - and emacs-lisp lacks it.
It seems to me that either:
1) these arguments should be added to each backend that lacks them
(emacs-lisp in particular), or
2) The documentation should indicate that they may not be supported in
every language.
At the moment I have the following workaround:
(advice-add #'org-babel-expand-body:emacs-lisp :around
(lambda (oldfn body params)
(let ((pro (cdr (assq :prologue params)))
(epi (cdr (assq :epilogue params))))
(concat
(if pro (concat pro "\n") "")
(funcall oldfn body params)
(if epi (concat epi "\n") ""))))
'((name . pe-advice)))
Emacs : GNU Emacs 29.1 (build 2, x86_64-pc-linux-gnu, GTK+ Version
3.24.33, cairo version 1.16.0)
of 2023-07-30
Package: Org mode version 9.6.9 ( @ /home/jet/.config/emacs/elpa/org-9.6.9/)
current state:
==============
(setq
org-link-elisp-confirm-function 'yes-or-no-p
org-ditaa-jar-path "/usr/share/ditaa/ditaa.jar"
org-bibtex-headline-format-function #[257 "\300 \236A\207" [:title] 3
"\n\n(fn ENTRY)"]
org-persist-after-read-hook '(org-element--cache-persist-after-read)
org-re-reveal-root "https://cdn.jsdelivr.net/npm/reveal.js@3.6.0";
org-export-before-parsing-hook '(org-attach-expand-links)
org-cycle-tab-first-hook '(org-babel-hide-result-toggle-maybe
org-babel-header-arg-expand)
org-archive-hook '(org-attach-archive-delete-maybe)
org-ascii-format-drawer-function #[771 " \207" [] 4 "\n\n(fn NAME CONTENTS
WIDTH)"]
org-cycle-hook '(org-cycle-hide-archived-subtrees
org-cycle-show-empty-lines org-cycle-optimize-window-after-visibility-change
org-cycle-display-inline-images)
org-latex-listings-options '(("basicstyle" "\\footnotesize\\ttfamily")
("showstringspaces" "false") ("breaklines" "true"))
org-persist-before-read-hook '(org-element--cache-persist-before-read)
org-mode-hook '(#[0 "\301\211 \207" [imenu-create-index-function
org-imenu-get-tree] 2] org-superstar-mode org-tempo-setup
(lambda nil (electric-indent-local-mode -1))
#[0 "\300\301\302\303\304$\207" [add-hook
change-major-mode-hook org-fold-show-all append local] 5]
#[0 "\300\301\302\303\304$\207" [add-hook
change-major-mode-hook org-babel-show-result-all append local] 5]
org-babel-result-hide-spec
org-babel-hide-all-hashes org-eldoc-load)
org-babel-load-languages '((emacs-lisp . t) (dot . t) (ditaa . t) (shell .
t))
org-latex-format-drawer-function #[514 "\207" [] 3 "\n\n(fn _ CONTENTS)"]
org-latex-format-headline-function
'org-latex-format-headline-default-function
org-confirm-shell-link-function 'yes-or-no-p
org-html-format-drawer-function #[514 "\207" [] 3 "\n\n(fn NAME CONTENTS)"]
outline-isearch-open-invisible-function 'outline-isearch-open-invisible
org-latex-classes '(("beamer"
"\\documentclass[11pt,aspectratio=169]{beamer}\n
\\usenavigationsymbolstemplate{} % no navigation bar\n
\\beamertemplateballitem % items have little balls"
("\\section{%s}" . "\\section*{%s}")
("\\subsection{%s}" . "\\subsection*{%s}") ("\\subsubsection{%s}" .
"\\subsubsection*{%s}"))
("article" "\\documentclass[11pt]{article}"
("\\section{%s}" . "\\section*{%s}") ("\\subsection{%s}" .
"\\subsection*{%s}")
("\\subsubsection{%s}" . "\\subsubsection*{%s}")
("\\paragraph{%s}" . "\\paragraph*{%s}")
("\\subparagraph{%s}" . "\\subparagraph*{%s}"))
("report" "\\documentclass[11pt]{report}"
("\\part{%s}" . "\\part*{%s}") ("\\chapter{%s}" . "\\chapter*{%s}")
("\\section{%s}" . "\\section*{%s}")
("\\subsection{%s}" . "\\subsection*{%s}") ("\\subsubsection{%s}" .
"\\subsubsection*{%s}"))
("book" "\\documentclass[11pt]{book}" ("\\part{%s}" .
"\\part*{%s}") ("\\chapter{%s}" . "\\chapter*{%s}")
("\\section{%s}" . "\\section*{%s}")
("\\subsection{%s}" . "\\subsection*{%s}") ("\\subsubsection{%s}" .
"\\subsubsection*{%s}"))
)
org-agenda-before-write-hook '(org-agenda-add-entry-text)
org-latex-packages-alist '(("" "moresize") ("" "fancyvrb") (""
"inconsolata") ("" "tikz") ("" "color") ("" "listings"))
org-src-mode-hook '(org-src-babel-configure-edit-buffer
org-src-mode-configure-edit-buffer)
org-confirm-elisp-link-function 'yes-or-no-p
org-latex-src-block-backend t
org-ditaa-eps-jar-path
"/home/jet/.config/emacs/elpa/contrib/scripts/DitaaEps.jar"
org-structure-template-alist '(("n" . "notes") ("a" . "export ascii") ("c"
. "center") ("C" . "comment") ("e" . "example") ("E" . "export")
("h" . "export html") ("l" . "export
latex") ("q" . "quote") ("s" . "src") ("v" . "verse"))
org-speed-command-hook '(org-speed-command-activate
org-babel-speed-command-activate)
org-html-format-inlinetask-function
'org-html-format-inlinetask-default-function
org-ascii-format-inlinetask-function 'org-ascii-format-inlinetask-default
org-export-backends '(ascii html icalendar latex md confluence re-reveal)
org-confirm-babel-evaluate nil
org-fold-core-isearch-open-function 'org-fold--isearch-reveal
org-re-reveal-title-slide "<h2>%t</h2><h2>%a</h2><h2>%d</h2>"
org-latex-format-inlinetask-function
'org-latex-format-inlinetask-default-function
org-persist-before-write-hook '(org-element--cache-persist-before-write)
org-tab-first-hook '(org-babel-hide-result-toggle-maybe
org-babel-header-arg-expand)
org-link-shell-confirm-function 'yes-or-no-p
org-babel-pre-tangle-hook '(save-buffer)
org-agenda-loop-over-headlines-in-active-region nil
org-occur-hook '(org-first-headline-recenter)
org-metadown-hook '(org-babel-pop-to-session-maybe)
org-link-parameters '(("attachment" :follow org-attach-follow :complete
org-attach-complete-link) ("eww" :follow org-eww-open :store
org-eww-store-link)
("rmail" :follow org-rmail-open :store
org-rmail-store-link) ("mhe" :follow org-mhe-open :store org-mhe-store-link)
("irc" :follow org-irc-visit :store
org-irc-store-link :export org-irc-export)
("info" :follow org-info-open :export
org-info-export :store org-info-store-link :insert-description
org-info-description-as-command)
("gnus" :follow org-gnus-open :store
org-gnus-store-link)
("docview" :follow org-docview-open :export
org-docview-export :store org-docview-store-link)
("bibtex" :follow org-bibtex-open :store
org-bibtex-store-link)
("bbdb" :follow org-bbdb-open :export
org-bbdb-export :complete org-bbdb-complete-link :store org-bbdb-store-link)
("w3m" :store org-w3m-store-link) ("doi" :follow
org-link-doi-open :export org-link-doi-export) ("id" :follow org-id-open)
("file+sys") ("file+emacs") ("shell" :follow
org-link--open-shell)
("news" :follow #[514 "\301\300\302 Q \"\207"
["news" browse-url ":"] 6 "\n\n(fn URL ARG)"])
("mailto" :follow #[514 "\301\300\302 Q \"\207"
["mailto" browse-url ":"] 6 "\n\n(fn URL ARG)"])
("https" :follow #[514 "\301\300\302 Q \"\207"
["https" browse-url ":"] 6 "\n\n(fn URL ARG)"])
("http" :follow #[514 "\301\300\302 Q \"\207"
["http" browse-url ":"] 6 "\n\n(fn URL ARG)"])
("ftp" :follow #[514 "\301\300\302 Q \"\207" ["ftp"
browse-url ":"] 6 "\n\n(fn URL ARG)"])
("help" :follow org-link--open-help :store
org-link--store-help) ("file" :complete org-link-complete-file)
("elisp" :follow org-link--open-elisp))
org-html-format-headline-function
'org-html-format-headline-default-function
org-metaup-hook '(org-babel-load-in-session-maybe)
org-tab-before-tab-emulation-hook '(org-tempo-complete-tag)
)
