[PATCH] Add :noweb-prefix and :noweb-trans babel header arguments

[Sébastien Miquel]

Hi,

The attached patch adds support for two new babel header arguments:
=:noweb-prefix= and =:noweb-trans=.

=:noweb-prefix= can be set to =no= to disable the noweb prefix
behaviour, where prefix characters are repeated when expanding a
multiline noweb reference.

=:noweb-trans= can be set to =prin1-to-string= to insert a lisp string
representing the content of the referenced src block.

The goal is to allow one to use, say, a LaTeX src block to represent
some LaTeX snippet to be tangled into a string in some lisp (or other)
code. This isn't possible currently, and one has to manually string
escape the LaTeX code.

As an example, the following two blocks

#+BEGIN_SRC LaTeX :tangle no :noweb-ref nw
\usepackage{…}
\usepackage{…}
#+END_SRC

#+BEGIN_SRC emacs-lisp :noweb yes :tangle yes :noweb-prefix no 
:noweb-trans prin1-to-string
(setq latex-header <<nw>>)
#+END_SRC

would tangle to

#+BEGIN_SRC emacs-lisp
(setq latex-header "\\usepackage{…}
\\usepackage{…}")
#+END_SRC

I've left undocumented the possibility of setting =:noweb-trans= to
another function. I wonder if anyone can think of some other use.

Regards,

--
Sébastien Miquel

0001-ob-core.el-Add-noweb-prefix-noweb-trans-babel-header.patch
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