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Babel: add comments to ERT for reading properties 

* testing/examples/babel.org (use case of reading entry properties):
Add comments to function definitions.
This commit is contained in:
Michael Brand 2013-11-15 19:20:25 +01:00
parent 668ba5de0e
commit 77710ec262
1 changed files with 8 additions and 0 deletions
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8
testing/examples/babel.org
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@ -413,6 +413,9 @@ Note: Just export of a property can be done with a macro: {{{property(a)}}}.
**** function definition
comments for ":var":
- The "or" is to deal with a property not present.
- The t is to get property inheritance.
#+NAME: src_block_location_shell
#+HEADER: :var a=(or (org-entry-get org-babel-current-src-block-location "a" t) "0")
#+HEADER: :var b=(or (org-entry-get org-babel-current-src-block-location "b" t) "0")
@ -433,6 +436,11 @@ Note: Just export of a property can be done with a macro: {{{property(a)}}}.
#+HEADER: :var e='nil
#+BEGIN_SRC emacs-lisp :exports results
(setq
;; - The first `or' together with ":var <var>='nil" is to check for
;; a value bound from an optional call argument, in the examples
;; here: c=5, e=6
;; - The second `or' is to deal with a property not present
;; - The t is to get property inheritance
a (or a (string-to-number
(or (org-entry-get org-babel-current-src-block-location "a" t)
"0")))