From: Jos'h Fuller <Jos'h.Fuller@arcproductions.com> To: Eric Schulte <firstname.lastname@example.org> Cc: "email@example.com" <firstname.lastname@example.org>, "Thomas S. Dye" <email@example.com> Subject: Re: Tangling without clutter? Date: Wed, 14 Mar 2012 19:35:32 +0000 [thread overview] Message-ID: <44B0EAE8544C834188E8790873CDE1CC3EA8C0@ARCEXCHANGE.arc.local> (raw) In-Reply-To: <firstname.lastname@example.org> Hi! > > It seems like I almost need some variant of the "tangle" argument to > > :noweb where syntax references are expanded for evaluation, but not > > for anything else. > > > > Why would you want to tangle out a python src file with an un-expanded > noweb reference? Either way, who am I to judge. I've just added a new > "eval" option to the noweb header argument which will expand noweb > references *only* during interactive evaluation. Please allow me to explain, I think it's a legitimate use case... I would like to provide a listing of a Python function, then later in the document show a demonstration of how it's used. I just did this when preparing some documentation for another programmer who is porting an application between languages. So I listed the function, then after a discussion, I had a demonstration of how to use the function. I wanted the output from the demonstration to be "live", generated from the demonstration code. Therefore, I needed to reference the function defined above. Unfortunately, the reference was expanded during export so that the same block of code appeared /twice/, presenting the reader with something like this: : Here's a function: : def gorking(): : return "gork" : : Here's how to use the function: : def gorking(): : return "gork" : : print gorking() : : Which gives us: : gork As you can see, it's rather clumsy to have the function in the output twice. It's not too bad for this example, but anything more than a few lines becomes quite a distraction! This would have been preferable: : Here's a function: : def gorking(): : return "gork" : : Here's how to use the function: : <<function-gorking>> : : print gorking() : : Which gives us: : gork The original %.org file would look like this: : Here's a function: : #+name: function-gorking : #+begin_src python :tangle yes : def gorking(): : return "gork" : #+end_src : : Here's how to use the function: : #+name: function-gorking-demo : #+begin_src python :tangle yes : <<function-gorking>> : : print gorking() : #+end_src : : Which gives us: : #+results: function-gorking-demo : gork Does that explain it better? Thanks! Jos'h
next prev parent reply other threads:[~2012-03-14 19:36 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-03-14 17:34 Jos'h Fuller 2012-03-14 18:22 ` Thomas S. Dye 2012-03-14 18:39 ` Jos'h Fuller 2012-03-14 19:13 ` Eric Schulte 2012-03-14 19:35 ` Jos'h Fuller [this message] 2012-03-14 18:34 ` Eric Schulte 2012-03-14 22:08 ` Jos'h Fuller 2012-03-14 20:52 ` Eric Schulte 2012-03-15 6:25 ` Viktor Rosenfeld 2012-03-15 8:42 ` Jacek Generowicz
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