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Subject: bug#24153: 25.1; Feature request: per-buffer cursor-color variable
Resent-From: Tej Chajed <tchajed@HIDDEN>
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From: Tej Chajed <tchajed@HIDDEN>
Date: Thu, 4 Aug 2016 11:08:12 -0400
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Currently there's a per-buffer cursor-type variable that is respected
per window and a single cursor-color variable that applies to the
entire frame.

Evil emulates a per-window cursor color in order to have the cursor
color of the active window reflect the buffer state (eg,
distinguishing insert and normal mode). It does so by advising
set-window and calling set-cursor-color if necessary; this can lead to
slowdowns when code calls set-window repeatedly (eg, through
with-selected-window).

It seems like the right way for evil to manage the cursor color is to
have an analogous per-buffer cursor-color variable natively provided
by emacs. Is this a doable feature?

Thanks!
Tej

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To: Tej Chajed <tchajed@HIDDEN>
Subject: bug#24153: Acknowledgement (25.1; Feature request: per-buffer
 cursor-color variable)
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Subject: bug#24153: 25.1; Feature request: per-buffer cursor-color variable
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> From: Tej Chajed <tchajed@HIDDEN>
> Date: Thu, 4 Aug 2016 11:08:12 -0400
> 
> It seems like the right way for evil to manage the cursor color is to
> have an analogous per-buffer cursor-color variable natively provided
> by emacs. Is this a doable feature?

I don't see up front why not.  Patches welcome.

Thanks.

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Subject: bug#24153: 25.1; Feature request: per-buffer cursor-color variable
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Tej Chajed <tchajed@HIDDEN> writes:
>
> Evil emulates a per-window cursor color in order to have the cursor
> color of the active window reflect the buffer state (eg,
> distinguishing insert and normal mode). It does so by advising
> set-window and calling set-cursor-color if necessary; this can lead to
> slowdowns when code calls set-window repeatedly (eg, through
> with-selected-window).

There's no `set-window' function, did you mean `select-window'?  I find
in the docstring for that function:

    Selections that "really count" are those causing a visible change in
    the next redisplay of WINDOW=E2=80=99s frame and should be always recor=
ded.
    So if you think of running a function each time a window gets
    selected put it on =E2=80=98buffer-list-update-hook=E2=80=99.

Perhaps using =E2=80=98buffer-list-update-hook=E2=80=99 instead of advising
`select-window' would help?

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On Thu, Aug 4, 2016 at 9:21 PM,  <npostavs@HIDDEN> wrote:
> Tej Chajed <tchajed@HIDDEN> writes:
>>
>> Evil emulates a per-window cursor color in order to have the cursor
>> color of the active window reflect the buffer state (eg,
>> distinguishing insert and normal mode). It does so by advising
>> set-window and calling set-cursor-color if necessary; this can lead to
>> slowdowns when code calls set-window repeatedly (eg, through
>> with-selected-window).
>
> There's no `set-window' function, did you mean `select-window'?

Yes, my mistake - the advice is on select-window.

>
> Perhaps using =E2=80=98buffer-list-update-hook=E2=80=99 instead of advisi=
ng
> `select-window' would help?

I haven't fully debugged this alternative, but it doesn't seem to
work. company-coq still uses save-window-excursion in
company-coq-ask-prover, which triggers the buffer-list-update-hook. In
addition, even with company-coq disabled this somehow doesn't call
evil-refresh-cursor enough; starting from insert mode, after the first
proof command, the color gets stuck on the normal mode color, and then
doesn't change until some other buffer list update.

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From: =?UTF-8?Q?Cl=c3=a9ment_Pit--Claudel?= <clement.pit@HIDDEN>
To: bug-gnu-emacs@HIDDEN, npostavs@HIDDEN
Message-ID: <009b9bb5-fef9-127a-a2df-fc037b29f636@HIDDEN>
Subject: Re: bug#24153: 25.1; Feature request: per-buffer cursor-color
 variable
References: <CAFCzHYb4ox1PRK9TWFTpvb_BaiS9sRiDSPTBHSXZbdomv0xmGg@HIDDEN>
 <87d1lo9fjm.fsf@HIDDEN>
In-Reply-To: <87d1lo9fjm.fsf@HIDDEN>

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On 2016-08-04 21:21, npostavs@HIDDEN wrote:
> Perhaps using =E2=80=98buffer-list-update-hook=E2=80=99 instead of advi=
sing
> `select-window' would help?

Hmmm. I don't think that would work.

Assume there are two windows, one showing a buffer in evil's normal editi=
ng mode, and one showing a buffer in evil's edit mode.  If the user has c=
onfigured evil to show the normal-mode cursor in green and the insert-mod=
e cursor in purple, then evil needs to change the cursor color every time=
 the user switches between these two windows, and (I don't think that) bu=
ffer-list-update-hook won't be sufficient for that.

Cheers,
Cl=C3=A9ment.


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 >>> Evil emulates a per-window cursor color in order to have the cursor
 >>> color of the active window reflect the buffer state (eg,
 >>> distinguishing insert and normal mode). It does so by advising
 >>> set-window and calling set-cursor-color if necessary; this can lead =
to
 >>> slowdowns when code calls set-window repeatedly (eg, through
 >>> with-selected-window).
 >>
 >> There's no `set-window' function, did you mean `select-window'?
 >
 > Yes, my mistake - the advice is on select-window.
 >
 >>
 >> Perhaps using =E2=80=98buffer-list-update-hook=E2=80=99 instead of ad=
vising
 >> `select-window' would help?
 >
 > I haven't fully debugged this alternative, but it doesn't seem to
 > work. company-coq still uses save-window-excursion in
 > company-coq-ask-prover, which triggers the buffer-list-update-hook.

Please tell us more about where and why =E2=80=98buffer-list-update-hook=E2=
=80=99
doesn't work in any of your use cases.  From what you say here you
expect =E2=80=98save-window-excursion=E2=80=99 to _not_ run =E2=80=98buff=
er-list-update-hook=E2=80=99.
Is that correct?

 > In
 > addition, even with company-coq disabled this somehow doesn't call
 > evil-refresh-cursor enough; starting from insert mode, after the first=

 > proof command, the color gets stuck on the normal mode color, and then=

 > doesn't change until some other buffer list update.

But IIUC you do not set the buffer of any window in these steps, so why
would you expect =E2=80=98buffer-list-update-hook=E2=80=99 to run?

martin

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 > Assume there are two windows, one showing a buffer in evil's normal
 > editing mode, and one showing a buffer in evil's edit mode.  If the
 > user has configured evil to show the normal-mode cursor in green and
 > the insert-mode cursor in purple, then evil needs to change the cursor=

 > color every time the user switches between these two windows, and (I
 > don't think that) buffer-list-update-hook won't be sufficient for
 > that.

This would be a bug.  =E2=80=98select-window=E2=80=99 should always run
=E2=80=98buffer-list-update-hook=E2=80=99 when NORECORD is nil.

martin

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From: =?UTF-8?Q?Cl=c3=a9ment_Pit--Claudel?= <clement.pit@HIDDEN>
To: martin rudalics <rudalics@HIDDEN>, 24153 <at> debbugs.gnu.org,
 npostavs@HIDDEN
Message-ID: <edc44032-9cde-3805-6c81-5baf6845cdfa@HIDDEN>
Subject: Re: bug#24153: 25.1; Feature request: per-buffer cursor-color
 variable
References: <CAFCzHYb4ox1PRK9TWFTpvb_BaiS9sRiDSPTBHSXZbdomv0xmGg@HIDDEN>
 <87d1lo9fjm.fsf@HIDDEN>
 <009b9bb5-fef9-127a-a2df-fc037b29f636@HIDDEN> <57A4C0BE.4040704@HIDDEN>
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On 2016-08-05 12:37, martin rudalics wrote:
>> Assume there are two windows, one showing a buffer in evil's normal
>> editing mode, and one showing a buffer in evil's edit mode.  If the
>> user has configured evil to show the normal-mode cursor in green and
>> the insert-mode cursor in purple, then evil needs to change the cursor=

>> color every time the user switches between these two windows, and (I
>> don't think that) buffer-list-update-hook won't be sufficient for
>> that.
>=20
> This would be a bug.  =E2=80=98select-window=E2=80=99 should always run=

> =E2=80=98buffer-list-update-hook=E2=80=99 when NORECORD is nil.

I see; thanks for clarifying!



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Subject: Re: bug#24153: 25.1; Feature request: per-buffer cursor-color
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On 2016-08-04 22:17, Tej Chajed wrote:
>>> Perhaps using =E2=80=98buffer-list-update-hook=E2=80=99 instead of ad=
vising
>>> `select-window' would help?
>
> I haven't fully debugged this alternative, but it doesn't seem to
> work. company-coq still uses save-window-excursion in
> company-coq-ask-prover, which triggers the buffer-list-update-hook.=20

IIRC I added this save-window-excursion call to work a Proof General issu=
e, back when I didn't know much about PG.  Now that I have commit rights =
there, I could probably move the fix upstream and remove the save-window-=
excursion call.

Cl=C3=A9ment.


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