Oh dear, I shouldn't have used `atomic-chrome' to format the message in
Gmail. So here's a revised version.

Dear All,

This patch adds the option to provide function and symbol for headline and
olp for org-capture-templates.

By that, I mean you can set the org-capture-templates in the following
manner:

(org-capture-templates `(("t" "Todo" entry (file+headline ,file (lambda ()
"A")) "** H1 %?")))

(org-capture-templates `(("t" "Todo" entry (file+headline ,file
test-org-capture/entry/headline) "** H1 %?")))
Where `test-org-capture/entry/headline' is a variable/symbol.

(org-capture-templates `(("t" "Todo" entry (file+olp ,file (lambda () '("A"
"B"))) "* H1 %?")))

(org-capture-templates `(("t" "Todo" entry (file+olp ,file
test-org-capture/entry/file+olp) "* H1 %?")))
Where `test-org-capture/entry/file+olp' is a variable/symbol.

I also added a few more unit tests for the targets `file+olp' and
`file+olp+datetree' to verify my new features and existing features.

However, I just realized that the suggestion provided in
https://lists.gnu.org/archive/html/emacs-orgmode/2024-05/msg00216.html
might not work how I was hoping for. Basically, I wanted it to be possible
to search for headlines and even outline paths in the
buffer while in the function. But, by expanding outline-path before setting
the buffer (by calling outside of `org-find-olp') that
becomes infeasible.