Hi Matt, Looking good here. Thanks! Tom On Wed, Sep 9, 2020 at 12:06 PM Matt Huszagh <huszaghm...@gmail.com> wrote: > > Tom Gillespie <tgb...@gmail.com> writes: > > > [...] I have a number of use > > cases that I can imagine would benefit greatly from being able to > > define a :header-args: :header (lambda () "yay!") property as a > > closure (and actually I assumed that it would just work that way if I > > tried to do it, clearly not though). I can't tell for sure if the > > patch enables this behavior though or whether I would still get a > > Wrong type argument error. > > This should work. Do you have reason for believing it might not?
With the patch applied this is working on my end. * test header :PROPERTIES: :header-args:bash: :tangle (lambda () "./from-header.sh") :END: #+begin_src bash :shebang "#!/usr/bin/env bash" echo yes #+end_src > > [...] Looking > > at the patch it seems that it preserves the behavior of performing the > > evaluation of the closures at the source block, but I'm not 100% sure. > > I'm not sure I completely understand what you mean here. However, the > closures are evaluated when point is at the source block, during the > source block evaluation, not when the default headers are declared. This > allows the closures to use context-dependent functionality (e.g. you can > call `org-element-at-point' inside the closure and retrieve whatever > information you want). Does this address your concern? Please clarify if > I've missed your point. Yep, you've got it. > > If the default header closures are being evaluated before checking > > whether they have been superseded by the headers on a block then that > > is incorrect and they should not be evaluated until it is clear that > > they are the value of the header for that block and have not been > > superseded. > > I've fixed my patch (attached) so that now closures are only evaluated > when they are used as part of the final set of headers. Great.