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Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lin
From: |
Nick Dokos |
Subject: |
Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines |
Date: |
Fri, 21 Oct 2011 14:09:44 -0400 |
Eric Schulte <address@hidden> wrote:
> >
> > 2. Allowing you to pass multiple buffer-wide arguments with :var. This
> > could make a substantive difference in some applications. The
> > following will work:
> >
> > #+BABEL: :var euro=1.3791 :var salestax=.15
> >
> > The following will not, since it tries to set the same property:
> >
> > #+PROPERTY: var euro=1.3791
> > #+PROPERTY: var salestax=.15
> >
> > If BABEL is dropped for PROPERTY, it would be good for the :var:
> > property to support multiple arguments (comma-separated would be good
> > for consistency with passing arguments through the SRCNAME). E.g.:
> >
> > #+PROPERTY: var euro=1.3791, salestax=.15
> >
> > I think I'd like this better in any case.
> >
>
> Nice idea. This same issue with "var" arose when we first started
> allowing header arguments to be specified inside subtree properties.
> I've just implemented your suggestion so the following are now possible.
>
> #+PROPERTY: var foo=1, bar=2
> #+PROPERTY: cache yes
> #+begin_src emacs-lisp
> (+ foo bar)
> #+end_src
>
> #+results[be32e67491d4e92f75769aebe423c20ca01626fe]:
> : 3
>
> and
>
> #+begin_src emacs-lisp :var foo="this", bar="that"
> (concat foo " " bar)
> #+end_src
>
> #+results[3cde077efa81f1ca24a62ac264dbd5776b6e0054]:
> : this that
>
> Thanks for the suggestion and I hope the above is a sufficient
> replacement for the now-missing #+BABEL: syntax.
>
Just to clarify my understanding: on a #+PROPERTY line, you *have* to
say
#+PROPERTY: var a=1, b=2
but in the code block itself, you can say *either*
#+begin_src emacs-lisp :var a=1, b=2
...
*or*
#+begin_src emacs-lisp :var a=1 :var b=2
...
Experimentally, both of these currently work: do you have any plans to
outlaw the last form?
Also, how does the comma-separated list of variable assignments interact
with a language where comma has syntactic significance? I was primarily
thinking of python where e.g. a=[1,2,3] or a=(1,2) is a legal
construct. AFAICT, that never worked in babel[fn:1], so it may not
matter much, but it may be a good idea to come up with a quoting
mechanism so things like that can be added in the future if necessary.
Thanks,
Nick
Footnotes:
[fn:1] I checked in 7.7 to avoid the recent churn with the following
code block
#+begin_src python :var a='(1,2)'
len(a)
#+end_src
and I get
,----
| File "<stdin>", line 3
| a=[1, [\,, 2]]
| ^
| SyntaxError: unexpected character after line continuation character
`----
in the org babel error output buffer.
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, (continued)
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Nick Dokos, 2011/10/20
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Eric Schulte, 2011/10/20
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Sebastien Vauban, 2011/10/21
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Christian Moe, 2011/10/21
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Rainer M Krug, 2011/10/21
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Christian Moe, 2011/10/21
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Rainer M Krug, 2011/10/21
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Christian Moe, 2011/10/21
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Rainer M Krug, 2011/10/21
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Eric Schulte, 2011/10/21
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines,
Nick Dokos <=
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Eric Schulte, 2011/10/22
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Rainer M Krug, 2011/10/21
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Rainer M Krug, 2011/10/21
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Christian Moe, 2011/10/22
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Rainer M Krug, 2011/10/24
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Eric Schulte, 2011/10/22
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Christian Moe, 2011/10/22
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Rainer M Krug, 2011/10/24
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Christian Moe, 2011/10/24
- Re: [O] [ANN] BREAKING CHANGE -- removing #+BABEL file-wide property lines, Sebastien Vauban, 2011/10/24