Hi again,
is there an elisp-way to see the header-arguments, that are passed to a
#+call-line ?
(This relates to my previous question "[babel] #+call-line removes hlines and
headings ?", but has
shifted in subject, so I would like to start a new thread, which can be
understood on its own ...)
I have tried the internal variable "params", but that only gives me the
header-arguments
of the #+begin_src-block and NOT of the #+call-line.
This is illustrated in the example below:
#+call: parameters() :colnames yes
#+results: parameters()
| :colname-names | nil |
|+--|
| :rowname-names | nil |
| :result-params | (silent replace) |
| :result-type | value|
| :comments | |
| :shebang | |
| :cache | no |
| :padline | |
| :noweb | no |
| :tangle| no |
| :exports | code |
| :results | silent |
| :session | none |
| :padnewline| yes |
| :hlines| yes |
| :colnames | no |
| :result-type | value|
| :result-params | (replace)|
| :rowname-names | nil |
| :colname-names | nil |
#+name: parameters
#+begin_src emacs-lisp
(mapcar (lambda (x) (list (car x) (cdr x))) params)
#+end_src
#+results: parameters
| :colname-names | nil |
| :rowname-names | nil |
| :result-params | (replace) |
| :result-type | value |
| :comments | |
| :shebang | |
| :cache | no|
| :padline | |
| :noweb | no|
| :tangle| no|
| :exports | code |
| :results | replace |
| :colnames | no|
| :hlines| yes |
| :padnewline| yes |
| :session | none |
The #+call line calls a #+begin_src-block named "parameters", which simple
dumps the
content of the params-variable, which contains all the header arguments.
If I pass ":colnames yes" as a header argument, I nevertheless get dumped "no"
in the example !
This is probably because the #+begin_src-block only has only access to its
own header-arguments (via the variable "params").
Therefore my question:
Is there any way to access the header-arguments of the #+call-line within the
#+begin_src-block ?
Maybe with the "params" variable or maybe any other way ?
The reason I need to know this: The value of the header-argument ":colnames" of
the #+call-line
governs, whether the #+begin_src-block is expected to return a table with or
without column-names;
so to react accordingly (and not surprise users) I need to know within the
#+begin_src-block
the value of the ":colnames" header-argument from the #+call-line.
Thanx a lot !
with kind regards, Marc-Oliver Ihm
P.s.: Possible solutions I can think of:
- Access the variable "params" not from the local scope but from the outer
scope, however
I do not know, if elisp allows this.
- Pass the header-arguments of the #+call-line to the #+begin_src-block, but
this would probably
require a patch to babel.
- Something even more elegant I just cannot figure out :-)
Am 30.01.2012 17:10, schrieb Eric Schulte:
>
> To explain the cause (if not rationale) for the current behavior; when
> executing a call line, an ephemeral code block is created at the point
> of the call line. The result of the called function is passed into this
> ephemeral block, and the output of the block is inserted into the
> buffer.
>
> This is why call lines have *two* possible sets of header arguments, one
> to pass to the original called code block, and one for local effect in
> the ephemeral block.
>
> The reason the colnames header argument is required for the call line
> and not the code block, is because hlines are only stripped when data
> passes *into* a code block as a variable. In this case the 'hlines are
> stripped when the table passes into the ephemeral code blocks.
>
> Hope the above is more illuminating that confusing,
>
