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Bug: :prologue and :epilogue are ignored in ob-sql code blocks (inter al


From: Tim Landscheidt
Subject: Bug: :prologue and :epilogue are ignored in ob-sql code blocks (inter alia)
Date: Tue, 24 Nov 2020 23:40:28 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux)

With Emacs 27.1/org-mode 9.3, "(org) Environment of a Code
Block" ends with:

| Inserting headers and footers
| -----------------------------

| The ‘prologue’ header argument is for appending to the top of the code
| block for execution, like a reset instruction.  For example, you may use
| ‘:prologue "reset"’ in a Gnuplot code block or, for every such block:
|
|      (add-to-list 'org-babel-default-header-args:gnuplot
|                   '((:prologue . "reset")))

|    Likewise, the value of the ‘epilogue’ header argument is for
| appending to the end of the code block for execution.

However it appears as if :prologue and :epilogue are ignored
in ob-sql code blocks:

| #+NAME: test-for-ob-sql
| #+BEGIN_SRC sql :engine postgresql :results verbatim :prologue "SELECT 1;" 
:epilogue "SELECT 5;" :cmdline --no-psqlrc -P format=aligned -P footer=on
|   SELECT 2;
|   SELECT 3;
|   SELECT 4;
| #+END_SRC

| #+RESULTS: test-for-ob-sql
| #+begin_example
|  ?column?
| ----------
|         2
| (1 Zeile)

|  ?column?
| ----------
|         3
| (1 Zeile)

|  ?column?
| ----------
|         4
| (1 Zeile)

| #+end_example

It seems that :prologue and :epilogue are only honoured in
languages that use org-babel-expand-body:generic and a
(very) few others; especially, the following languages prob-
ably ignore them (untested):

| [tim@passepartout ~/src/emacs]$ find lisp/org -type f -name ob-\*.el \
| > -not -exec fgrep -q 'org-babel-expand-body:generic' {} \; \
| > -not -exec fgrep -q ':prologue' {} \; \
| > -print
| lisp/org/ob-C.el
| lisp/org/ob-J.el
| lisp/org/ob-abc.el
| lisp/org/ob-awk.el
| lisp/org/ob-calc.el
| lisp/org/ob-clojure.el
| lisp/org/ob-comint.el
| lisp/org/ob-css.el
| lisp/org/ob-ditaa.el
| lisp/org/ob-dot.el
| lisp/org/ob-ebnf.el
| lisp/org/ob-emacs-lisp.el
| lisp/org/ob-eval.el
| lisp/org/ob-exp.el
| lisp/org/ob-fortran.el
| lisp/org/ob-hledger.el
| lisp/org/ob-latex.el
| lisp/org/ob-ledger.el
| lisp/org/ob-lisp.el
| lisp/org/ob-lob.el
| lisp/org/ob-makefile.el
| lisp/org/ob-matlab.el
| lisp/org/ob-mscgen.el
| lisp/org/ob-org.el
| lisp/org/ob-picolisp.el
| lisp/org/ob-ref.el
| lisp/org/ob-sed.el
| lisp/org/ob-shen.el
| lisp/org/ob-sql.el
| lisp/org/ob-sqlite.el
| lisp/org/ob-table.el
| lisp/org/ob-stan.el
| lisp/org/ob-vala.el



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