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This makes it, so that GNOME can handle system-wide input methods installed
by adding them to the gnome package, to the operating system packages, or
to some other profile-service.  An example would be a system-wide installation
of ibus along with input methods like ibus-anthy or ibus-rime.

* gnu/services/desktop.scm (gnome-environment): New variable.
(gnome-desktop-service-type)[extensions]: Use it here.
---
 gnu/services/desktop.scm | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/gnu/services/desktop.scm b/gnu/services/desktop.scm
index 265cf9f35f..8a571aacb0 100644
--- a/gnu/services/desktop.scm
+++ b/gnu/services/desktop.scm
@@ -918,12 +918,43 @@ rules."
            "gnome-system-monitor"
            "gvfs"))))
 
+(define (gnome-environment config)
+  (let* ((lib "/run/current-system/profile/lib")
+         (im-module-files
+          `(("3"
+             "GUIX_GTK3_IM_MODULE_FILE"
+             .
+             ,(string-append lib "/gtk-3.0/3.0.0/immodules-gtk3.cache"))
+            ("2"
+             "GUIX_GTK2_IM_MODULE_FILE"
+             .
+             ,(string-append lib "/gtk-2.0/2.10.0/immodules-gtk2.cache"))))
+         (versions
+          (filter-map
+           (match-lambda
+             ((_ pkg)
+              (and (package? pkg)
+                   (string=? (package-name pkg) "gtk+")
+                   (version-major (package-version pkg))))
+             ((_ pkg "out")
+              (and (package? pkg)
+                   (string=? (package-name pkg) "gtk+")
+                   (version-major (package-version pkg))))
+             (_ #f))
+           (package-transitive-inputs (gnome-package config)))))
+    (filter-map
+     (lambda (version)
+       (assoc-ref im-module-files version))
+     (delete-duplicates versions))))
+
 (define gnome-desktop-service-type
   (service-type
    (name 'gnome-desktop)
    (extensions
     (list (service-extension polkit-service-type
                              gnome-polkit-settings)
+          (service-extension session-environment-service-type
+                             gnome-environment)
           (service-extension profile-service-type
                              (compose list
                                       gnome-package))))
-- 
2.29.1





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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Leo Prikler <leo.prikler@HIDDEN>
Subject: bug#44354: Acknowledgement ([PATCH] gnu: gnome-deskop-service-type:
 Set GUIX_GTK*_IM_MODULE_FILE.)
Message-ID: <handler.44354.B.160416336125627.ack <at> debbugs.gnu.org>
References: <20201031164602.13152-1-leo.prikler@HIDDEN>
X-Gnu-PR-Message: ack 44354
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Date: Sat, 31 Oct 2020 16:57:02 +0000

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Hi Leo,

I haven=E2=80=99t been able to get ibus-libpinyin to work even when these=20
variables are set.  I know that these variables used to work once.

I don=E2=80=99t know if setting them is the correct thing to do for Gnome.=
=20
This patch would also only work for system-wide installations of=20
input methods.  Input methods that have been installed in a user=20
profile would not be part of the cache files.

Can we take a step back and come to an understanding of how ibus=20
in Gnome is supposed to work?  Ibus in Gnome is (supposed to be)=20
more =E2=80=9Cintegrated=E2=80=9D than in other environments, which means t=
hat we=20
should first aim to understand what Gnome attempts to do with=20
ibus.

We should also take into account dconf keys, such as these:

/desktop/ibus/
/org/gnome/desktop/input-sources/mru-sources
/org/gnome/desktop/input-sources/sources
/org/gnome/desktop/interface/gtk-im-module

What do you think?

--=20
Ricardo




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Hi,

Am Dienstag, den 04.05.2021, 09:46 +0200 schrieb Ricardo Wurmus:
> Hi Leo,
> 
> I haven’t been able to get ibus-libpinyin to work even when these 
> variables are set.  I know that these variables used to work once.
"Used to work" in what sense?  Did ibus-libpinyin work for you or
someone else with these variables set and now it's no longer working?

> I don’t know if setting them is the correct thing to do for Gnome. 
> This patch would also only work for system-wide installations of 
> input methods.  Input methods that have been installed in a user 
> profile would not be part of the cache files.
I'm not sure we can expect things to "just work" with ibus in the user
profile.  As far as I'm aware, we don't expect GDM to find the user's
custom gnome installation without some hacking on their part, so I
don't understand why we would expect GNOME to find ibus in a similar
setup.

> Can we take a step back and come to an understanding of how ibus 
> in Gnome is supposed to work?  Ibus in Gnome is (supposed to be) 
> more “integrated” than in other environments, which means that we 
> should first aim to understand what Gnome attempts to do with 
> ibus.
As far as I know, GNOME should recognize ibus as one of its input
modules and then offer appropriate input sources in its settings.  The
specifics are handled by gsd-keyboard-manager, at least as far as
setting these is concerned.  How the settings are interpreted is
probably a matter of GtkIMContext, which at some point hands off
control to ibus IIUC.

> We should also take into account dconf keys, such as these:
> 
> /desktop/ibus/
This seems to contain settings, that IBus wants to know about,
including stuff like what Emojis you last typed for the completion UI
and so on, and so forth.  Of particular interest here is probably the
key '/desktop/ibus/general/preload-engines', which lists all engines to
load at startup.
> /org/gnome/desktop/input-sources/mru-sources
> /org/gnome/desktop/input-sources/sources
These are lists of tuples, which are either ('xkb', VARIANT) or
('ibus', ENGINE).  As far as I know, the latter won't work correctly
without GNOME knowing about ibus existing, for which I patch GUIX_GTK*_IM_MODULE_FILE.
> /org/gnome/desktop/interface/gtk-im-module
This one's likely set to "ibus" inside an ibus setup.  In particular,
gsd-keyboard-manager sets it to "ibus" if it notices any of the input-
sources to contain an ibus engine and to "gtk-im-context-simple"
otherwise.  I'm sure there would be more elegant solutions, but that's
the one they chose.

Regards,
Leo





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Leo Prikler <leo.prikler@HIDDEN> writes:

> Hi,
>
> Am Dienstag, den 04.05.2021, 09:46 +0200 schrieb Ricardo Wurmus:
>> Hi Leo,
>>=20
>> I haven=E2=80=99t been able to get ibus-libpinyin to work even when=20
>> these=20
>> variables are set.  I know that these variables used to work=20
>> once.
> "Used to work" in what sense?  Did ibus-libpinyin work for you=20
> or
> someone else with these variables set and now it's no longer=20
> working?

Yes.

IIRC I patched GTK back in the day to respect these extra=20
variables.  I did that because that made things work.  This=20
predates at least two upgrades to Gnome and the decision on=20
Gnome=E2=80=99s part to =E2=80=9Cintegrate=E2=80=9D ibus more tightly; I do=
n=E2=80=99t know=20
exactly when things broke because all I know is that when I=20
returned to Guix after a months-long hiatus things no longer=20
worked.

>> I don=E2=80=99t know if setting them is the correct thing to do for=20
>> Gnome.=20
>> This patch would also only work for system-wide installations=20
>> of=20
>> input methods.  Input methods that have been installed in a=20
>> user=20
>> profile would not be part of the cache files.
> I'm not sure we can expect things to "just work" with ibus in=20
> the user
> profile.  As far as I'm aware, we don't expect GDM to find the=20
> user's
> custom gnome installation without some hacking on their part, so=20
> I
> don't understand why we would expect GNOME to find ibus in a=20
> similar
> setup.

Because it worked just like that before.

Ibus should be a user process with user configuration.  This is=20
not inherently global, so only making it work with globally=20
installed input methods is a restriction that I think we should=20
aim to do without.

--=20
Ricardo




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Am Dienstag, den 04.05.2021, 11:58 +0200 schrieb Ricardo Wurmus:
> Leo Prikler <leo.prikler@HIDDEN> writes:
> 
> > Hi,
> > 
> > Am Dienstag, den 04.05.2021, 09:46 +0200 schrieb Ricardo Wurmus:
> > > Hi Leo,
> > > 
> > > I haven’t been able to get ibus-libpinyin to work even when 
> > > these 
> > > variables are set.  I know that these variables used to work 
> > > once.
> > "Used to work" in what sense?  Did ibus-libpinyin work for you 
> > or
> > someone else with these variables set and now it's no longer 
> > working?
> 
> Yes.
> 
> IIRC I patched GTK back in the day to respect these extra 
> variables.  I did that because that made things work.  This 
> predates at least two upgrades to Gnome and the decision on 
> Gnome’s part to “integrate” ibus more tightly; I don’t know 
> exactly when things broke because all I know is that when I 
> returned to Guix after a months-long hiatus things no longer 
> worked.
I think the reason why this might not work if you're putting things
into ~/.guix-profile is because that IM_MODULE_FILE is incomplete. 
Compare its contents against the one where everything is built into the
system, there will be huge differences.

> > > I don’t know if setting them is the correct thing to do for 
> > > Gnome. 
> > > This patch would also only work for system-wide installations 
> > > of 
> > > input methods.  Input methods that have been installed in a 
> > > user 
> > > profile would not be part of the cache files.
> > I'm not sure we can expect things to "just work" with ibus in 
> > the user
> > profile.  As far as I'm aware, we don't expect GDM to find the 
> > user's
> > custom gnome installation without some hacking on their part, so 
> > I
> > don't understand why we would expect GNOME to find ibus in a 
> > similar
> > setup.
> 
> Because it worked just like that before.
> 
> Ibus should be a user process with user configuration.  This is 
> not inherently global, so only making it work with globally 
> installed input methods is a restriction that I think we should 
> aim to do without.
What is a "user process with user configuration" here?  The way I
understand those words, is that
a. the process is launched under the user's account, and
b. the configuration for that process lies in the user's directory.
Certainly, those two hold for ibus.  But they also hold for gnome,
which should not be inherently global either by the above argument. 
Yet managing gnome system-wide is significantly easier than managing it
per-user.

Also note, that my patch would not bar you from setting
GUIX_GTK*_IM_MODULE_FILE to something else if you indeed have a local
ibus setup.  I'd even go so far as to argue, that it doesn't make your
setup more difficult at all.  All it does is make things easier for
those who want a global gnome+ibus setup.

Regards,
Leo






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