bug#43539: [PATCH] gnu: vim: Automatically find vim plugins.

[Efraim Flashner <efraim@flashner.co.il>]

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On Fri, Sep 25, 2020 at 07:48:34PM +0200, Marius Bakke wrote:
> Efraim Flashner <efraim@flashner.co.il> writes:
> 
> > On Sun, Sep 20, 2020 at 11:57:58PM +0300, Efraim Flashner wrote:
> >> On Sun, Sep 20, 2020 at 09:50:12PM +0200, Ricardo Wurmus wrote:
> >> > 
> >> > Efraim Flashner <efraim@flashner.co.il> writes:
> >> > 
> >> > > On Sun, Sep 20, 2020 at 09:29:27PM +0200, Ricardo Wurmus wrote:
> >> > >> 
> >> > >> Efraim Flashner <efraim@flashner.co.il> writes:
> >> > >> 
> >> > >> > diff --git a/gnu/packages/aux-files/guix.vim b/gnu/packages/aux-files/guix.vim
> >> > >> > new file mode 100644
> >> > >> > index 0000000000..ca97f451d8
> >> > >> > --- /dev/null
> >> > >> > +++ b/gnu/packages/aux-files/guix.vim
> >> > >> > @@ -0,0 +1,7 @@
> >> > >> > +" This appends all of the vim plugins to the end of Vim's runtimepath.
> >> > >> > +for directory in ["/run/current-system/profile", $HOME . "/.guix-profile", $GUIX_ENVIRONMENT]
> >> > >> 
> >> > >> How about using $GUIX_PROFILE as well or instead of $HOME/.guix-profile?
> >> > >> This would allow users to keep a separate profile for Vim things.
> >> > >
> >> > > That was the one part I didn't really like about my patch. Unfortunately
> >> > > I don't seem to have $GUIX_PROFILE set on my machine.
> >> > >
> >> > > (ins)efraim@E5400 ~$ echo $GUIX_PROFILE
> >> > >
> >> > > (ins)efraim@E5400 ~$
> >> > 
> >> > Me neither!  But when loading profiles we suggest this approach:
> >> > 
> >> >    export GUIX_PROFILE=/the/location/of/the/.guix-profile
> >> >    source $GUIX_PROFILE/etc/profile
> >> > 
> >> > The variable is set in that case, because that affects whether absolute
> >> > store file names are used or the symlink
> >> > “/the/location/of/the/.guix-profile”.
> >> 
> >> It seems to be the case for the default profile. And in Guix System. I
> >> could also just add $GUIX_PROFILE as another location in the list of
> >> directories to search.
> >
> > The more I think about it the more I see $HOME/.guix-profile as a
> > "special profile" which is nearly always included in $PATH and other
> > variables, similar to /run/current-system/profile. With that in mind I
> > like the attached patch which keeps that path but adds a search for
> > $GUIX_PROFILE.
> >
> > I could use environment variables to override vim's builtin search for
> > $VIM and $VIMRUNTIME, but then we would have to decide to support vim
> > installed by the user or system-wide.
> 
> So vim only expects a single vimfiles directory in those variables?
> 
> [...]
> 
> > +++ b/gnu/packages/aux-files/guix.vim
> > @@ -0,0 +1,7 @@
> > +" This appends all of the vim plugins to the end of Vim's runtimepath.
> > +for directory in ["/run/current-system/profile", $HOME . "/.guix-profile", $GUIX_PROFILE, $GUIX_ENVIRONMENT]
> > +    let vimplugins = directory . "/share/vim/vimfiles"
> > +    if isdirectory(vimplugins)
> > +        let &rtp = join([&rtp,vimplugins], ',')
> > +    endif
> > +endfor
> 
> I wonder if we could generalize this to a proper search path with
> something like (pseudo code):
> 
>   for directory in getenv("VIM_PLUGIN_PATH").split(":")
>     let vimplugins = directory . "share/vim/vimfiles"
>     ...

Note for the future, 'let vimplugins = directory' is what works here.

> 
> And then in the vim package:
> 
> (native-search-paths
>  (list
>   (search-path-specification
>    (variable "VIM_PLUGIN_PATH")
>    (files '("share/vim/vimfiles")))))
> 
> ...which makes Guix populate VIM_PLUGIN_PATH automatically as plugins
> are added to a profile/environment (as long as it contains the 'vim'
> package).
> 
> WDYT?

I wasn't able to get anything like that to work. For some reason the
only combination I got using VIM_PLUGIN_PATH to work was a
guix-environment with vim and a plugin in it.

I pushed the version with the hardcoded list of directories since I was
able to actually get that one to work.

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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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