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[elpa] externals/org 005bba5 1/5: etc/ORG-NEWS: Add news item about org-
From: |
ELPA Syncer |
Subject: |
[elpa] externals/org 005bba5 1/5: etc/ORG-NEWS: Add news item about org-babel-default-header-args accepting closures |
Date: |
Wed, 29 Sep 2021 02:57:20 -0400 (EDT) |
branch: externals/org
commit 005bba5348226bdc97aafb42afd0aec94e26e973
Author: Bastien <bzg@gnu.org>
Commit: Bastien <bzg@gnu.org>
etc/ORG-NEWS: Add news item about org-babel-default-header-args accepting
closures
---
etc/ORG-NEWS | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/etc/ORG-NEWS b/etc/ORG-NEWS
index 283e4b1..ba220d9 100644
--- a/etc/ORG-NEWS
+++ b/etc/ORG-NEWS
@@ -441,6 +441,33 @@ See [[msg:875z8njaol.fsf@protesilaos.com][this thread]].
attachment directory at calls of ~org-attach-sync~. There is
Never delete, Always delete and Query the user (default).
+*** ~org-babel-default-header-args~ can now be specified as closures or strings
+
+~org-babel-default-header-args~ now also accepts closures that
+evaluate to a string. Previously, only direct strings were
+supported. These closures are evaluated when point is at the source
+block, which allows them to make use of contextual information at the
+relevant source block. One example that illustrates the usefulness of
+this addition (also given in the documentation for
+~org-babel-default-header-args~) is:
+
+#+begin_src elisp
+(defun org-src-sha ()
+ (let ((elem (org-element-at-point)))
+ (concat (sha1 (org-element-property :value elem)) \".svg\")))
+
+(setq org-babel-default-header-args:latex
+ `((:results . \"file link replace\")
+ (:file . (lambda () (org-src-sha)))))
+#+end_src
+
+This will set the ~:file~ header argument to the sha1 checksum of the
+contents of the current latex source block.
+
+Finally, the closures are only evaluated if they're not overridden for
+a source block. This improves efficiency in cases where the result of
+a compute-expensive closure would otherwise be discarded.
+
** Miscellaneous
*** =org-bibtex= includes =doi= and =url= entries when exporting to BiBTeX
=doi= and =url= entries have been made optional for some publication