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Re: [O] org-map-entries but with arguments?
From: |
Adam Porter |
Subject: |
Re: [O] org-map-entries but with arguments? |
Date: |
Wed, 18 Sep 2019 20:34:25 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) |
Matt Price <address@hidden> writes:
> OK, this is pretty cool, thank you. I took John's excellent
> suggestion of using a headline property to store the appropriate
> actions, but it makes sense to switch to org-ql if I can master the
> syntax (which seems awfully powerful). One questions: does
> org-ql-select respect buffer narrowing? That would be important for
> me.
Yes, just pass the argument ":narrow t". Take a look at the examples
and documentation, you can do a bunch of things. :)
> Another question. In place of a function or sexp, the :action key
> accepts the keyword "element" as a value, and will return a parsed
> headline. Is it possible to then pass that value on to a function that
> will be evaluated? I'm asking because I have a bunch of functions with
> very long `let` sections in which information is extracted from a
> headline with (org-entry-get).
There are a few ways to do something like that:
1. Just call functions like org-entry-get from the action function
(which is called with point at each match). For simple things, this is
the simplest way.
2. In a custom action function, do what the "element" action does, i.e.
(org-element-headline-parser (line-end-position)), then do whatever you
need with the resulting element.
3. Collect the elements into a list (i.e. use ":action 'element") and
map across it. Since that requires more consing, it will probably be
slower, but likely not a performance problem in most cases.
> It would be nice to use John's plist trick (from the other thread
> we're on) to, essentially, let-plist all the properties of the
> headline. It would declutter my code significantly.
You'll probably want to use -let from dash.el, with its &plist or &keys
destructuring. &plist was added to -let since John wrote that article,
and it also gives you all the other powerful features of -let. It works
well and is fast. You could also use pcase-let*'s destructuring, which
is built-in to Emacs, but its syntax is a bit more complex.
Re: [O] org-map-entries but with arguments?, John Kitchin, 2019/09/18