* customize xref
@ 2017-01-10 18:28 James K. Lowden
2017-01-10 20:38 ` James K. Lowden
0 siblings, 1 reply; 4+ messages in thread
From: James K. Lowden @ 2017-01-10 18:28 UTC (permalink / raw)
To: help-gnu-emacs
I have an elisp syntax question.
I'd like to customize xref such that, when I jump to a definition, it
puts the line it finds at the top of the window. "customize group" led
me to xref-after-jump-hook, which calls recenter, and recenter takes an
optional argument that, if provided, is the line to "recenter" on.
Indeed, if I use "C-u 0 M-x recenter", it puts the line the cursor is
on at the top of the window.
By passing "xref" to customize-group, I was able to see roughly what to
do. In my .emacs I now see this (other settings elided):
(custom-set-variables
'(xref-after-jump-hook
(quote (recenter xref-pulse-momentarily))))
How to sneak an argument in there? I tried this:
(custom-set-variables
'(xref-after-jump-hook
(quote ((recenter 0) xref-pulse-momentarily))))
but that only produces the error:
run-hooks: Invalid function: (recenter 0)
I know I'm in the vicinity of quoting, but I'm not sure how to see
around the corner. Help?
--jkl
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: customize xref
2017-01-10 18:28 customize xref James K. Lowden
@ 2017-01-10 20:38 ` James K. Lowden
2017-01-11 0:42 ` Dmitry Gutov
2017-01-11 9:03 ` Ralf Fassel
0 siblings, 2 replies; 4+ messages in thread
From: James K. Lowden @ 2017-01-10 20:38 UTC (permalink / raw)
To: help-gnu-emacs
On Tue, 10 Jan 2017 13:28:08 -0500
"James K. Lowden" <jklowden@speakeasy.net> wrote:
> (custom-set-variables
> '(xref-after-jump-hook
> (quote (recenter xref-pulse-momentarily))))
I see:
(custom-set-variables
'(xref-after-jump-hook
(quote (lambda () (recenter 0) xref-pulse-momentarily))))
Because recenter is a function, it needs to be replaced with a
function, not a function invocation, and not the output of a function.
Unless, that is -- as in the case of lambda -- the function returns a
function.
In this case, xref-after-jump-hook takes as parameters two arguments,
each a function. I can't pass it 3 arguments
(recenter 0 xref-pulse-momentarily)
nor the result of recentering,
((recenter 0) xref-pulse-momentarily)
but I can pass it an unnamed function. The lisp interpreter reduces
(quote (lambda () (recenter 0) xref-pulse-momentarily))
by executing the lambda to
(quote (anonymous-func xref-pulse-momentarily))
where anonymous-func calls (recenter 0).
--jkl
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-01-11 9:03 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-01-10 18:28 customize xref James K. Lowden
2017-01-10 20:38 ` James K. Lowden
2017-01-11 0:42 ` Dmitry Gutov
2017-01-11 9:03 ` Ralf Fassel
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.