* Make company-backends buffer-local?
@ 2018-03-04 7:47 Jefferson Carpenter
2018-03-04 15:55 ` Stefan Monnier
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Jefferson Carpenter @ 2018-03-04 7:47 UTC (permalink / raw)
To: emacs-devel
First post to this list -- sorry if this is either not a good suggestion
at all, not right format, or too irrelevant.
The company-backends variable is currently a global variable. The
backend that serves completions is the first one that returns a prefix
for the location at point.
Are there any barriers to making company-backends a buffer-local
variable? I don't see any drawbacks - it would take a pretty small
amount of extra memory to create a copy for each buffer. The advantages
include:
1: You can specify backends mode by mode. I at least feel this makes
far more sense philosophically.
2: Would fix a possible issue where a backend at the beginning of the
list is actually for a different file type - maybe for a similar
language, say Java vs C++ - however still happens to return a prefix,
and subsequently doesn't return any of the right completions.
3 (extremely minor): Might speed up completions for backends that were
at the end of the list, since each mode can be programmed with a
specific list of backends.
TY,
Jefferson Carpenter
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Make company-backends buffer-local?
2018-03-04 7:47 Make company-backends buffer-local? Jefferson Carpenter
@ 2018-03-04 15:55 ` Stefan Monnier
2018-03-04 16:25 ` Clément Pit-Claudel
2018-03-04 19:26 ` Dmitry Gutov
2 siblings, 0 replies; 4+ messages in thread
From: Stefan Monnier @ 2018-03-04 15:55 UTC (permalink / raw)
To: emacs-devel
> Are there any barriers to making company-backends a buffer-local variable?
If you write your backend as a completion-at-point-function (which is
recommended whenever possible since that lets it work not just in
company), then it's already the case, since the normal way to specify
such a backend is via
(add-hook 'completion-at-point-functions #'my-backend-function nil t)
-- Stefan
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Make company-backends buffer-local?
2018-03-04 7:47 Make company-backends buffer-local? Jefferson Carpenter
2018-03-04 15:55 ` Stefan Monnier
@ 2018-03-04 16:25 ` Clément Pit-Claudel
2018-03-04 19:26 ` Dmitry Gutov
2 siblings, 0 replies; 4+ messages in thread
From: Clément Pit-Claudel @ 2018-03-04 16:25 UTC (permalink / raw)
To: emacs-devel
On 2018-03-04 02:47, Jefferson Carpenter wrote:
> The company-backends variable is currently a global variable. The
> backend that serves completions is the first one that returns a
> prefix for the location at point.
Most of the modes I write use setq-local to change that variable; is there a further advantage to be gained from making it buffer-local by default?
Clément.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Make company-backends buffer-local?
2018-03-04 7:47 Make company-backends buffer-local? Jefferson Carpenter
2018-03-04 15:55 ` Stefan Monnier
2018-03-04 16:25 ` Clément Pit-Claudel
@ 2018-03-04 19:26 ` Dmitry Gutov
2 siblings, 0 replies; 4+ messages in thread
From: Dmitry Gutov @ 2018-03-04 19:26 UTC (permalink / raw)
To: Jefferson Carpenter, emacs-devel
On 3/4/18 9:47 AM, Jefferson Carpenter wrote:
> First post to this list -- sorry if this is either not a good suggestion
> at all, not right format, or too irrelevant.
>
> The company-backends variable is currently a global variable. The
> backend that serves completions is the first one that returns a prefix
> for the location at point.
>
> Are there any barriers to making company-backends a buffer-local
> variable? I don't see any drawbacks - it would take a pretty small
> amount of extra memory to create a copy for each buffer.
You can do this in your own init script. Performance benefits are
negligible, but you can organize your backends this way.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2018-03-04 19:26 UTC | newest]
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2018-03-04 7:47 Make company-backends buffer-local? Jefferson Carpenter
2018-03-04 15:55 ` Stefan Monnier
2018-03-04 16:25 ` Clément Pit-Claudel
2018-03-04 19:26 ` Dmitry Gutov
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