Re: [PATCH] ob-tangle.el: restore :tangle closure nil behavior

[Tom Gillespie <tgbugs@gmail.com>]

> My confusion about you patch comes from the fact that
>
> #+begin_src emacs-lisp :tangle (if (= 1 1) "yes")
> 2
> #+end_src
>
> works just fine on main.

It appears to work fine on main, but that is because
what is actually happening behind the scenes is that in the test
(unless (or (string= src-tfile "no") ...) ...) the actual comparison is
(string= "(if (= 1 1) \"yes\")" "no") which appears to work, but is
not comparing the result of the closure, only its string value.

> I admit that I don't fully understand your use case.

I want to use a closure to conditionally control whether a block will tangle.
If I hardcode :tangle no, then :var x=(error "oops") will not evaluate. The
(error "oops") is a placeholder for a number of things that will result in
an error if the condition for :tangle (when condition "file-name") is not
satisfied.

> Something like (org-babel-get-heading-arg :tangle info/params)

I need to go to bed, because I definitely started on an implementation
of that I forgot about it as a potential solution. Yes, this seems like
a better and clearer way to go about it.

> May you please elaborate?

Disregard, your suggestion clarified what you meant, and in
that case, yes we can consolidate.