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Re: [O] [babel] Should babel be more error intolerant?

From: Eric Schulte
Subject: Re: [O] [babel] Should babel be more error intolerant?
Date: Sat, 08 Oct 2011 11:23:41 -0600
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

Torsten Wagner <address@hidden> writes:

> Hi,
> just playing around with a new aspect of org-mode and babel, I
> noticed, that many of my typos and wrong syntax using are silently
> accepted resp. ignored.
> Even the message buffer keeps quite.
> I just wonder if babel should be more error intolerant to tell users
> that they are actually doing something wrong.
> E.g., I don't see any error messages for (marked the typo by *):
> #+begin_src latex :file*s* fig/mypicture.pdf :packages '(("" "tikz"))
> :border 1em :fit  :results output silent
> or
> #+begin_src latex :file fig/mypicture.pdf :packages '(("" "tikz"))
> :border 1em :fit  :*result* output silent
> or
> #+begin_src latex :file fig/mypicture.pdf :packages '(("" "tikz"))
> :border 1em :fit  :results output *quite*
> obviously the above errors might happen quickly just as typos or
> because one tries to use commands from memory.
> Trying something new, this might drive someone quickly crazy. One is
> going to tackle the problem in many different ways and finally after
> several minutes (or even hours) one notice its simply "silent" and not
> "quite" ;)

There are no disallowed header arguments, and language is free to add
its own arbitrary new header arguments so it is not possible to raise
warnings on unknown header arguments.  There is however a helper
function which will inspect header arguments bound to C-c v c.  This may
prove useful if you get into the habit of using it as your first step in
debugging code blocks.

> I would prefer a bold
> Error ":results output quite" is unknown to babel
> in the minibuffer, maybe including jumping to the line in question.
> Others might like to keep it quite (or silent), I guess it could be
> easily set by an optional flag
> like #+BABEL:debug:t
> As a side note of this, I wonder if babel could use the same/similar
> way like the TODO field in org-mode to switch between all possible
> parameters for a certain code block?
> I learned, different code blocks can have quite different possible
> parameters. A bit difficult to remember esp., if you don't use them on
> a daily basis.
> If one could place the pointer to e.g., the :results keyword and hit
> C-c C-t to switch between all possibilities for the :exports keyword
> for this particular source code block, it would greatly simply the
> usage and reduce errors. Parameters which require additional user
> input like file names could indicate this (like in the manual) by
> indicating it within brackets e.g., <filename>.

This is a very good idea and shouldn't be too difficult to implement for
all of those header arguments which are common across all languages.
I'll place this on my todo list...

Best -- Eric

> Thanks for all the help and support
> Torsten

Eric Schulte

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