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Re: bug#22970: guix edit mutt -- not working

From: Jean Louis
Subject: Re: bug#22970: guix edit mutt -- not working
Date: Sat, 12 Mar 2016 10:35:25 +0100

Hello Alex,

Thank you much, it is working like this very good:

guix package -i my-mutt

by using this file: my-guix-packages.scm in ~/gnu/guix/packages:

 (define-module (my-guix-packages)
   #:use-module (guix packages)
   #:use-module (guix download)
   #:use-module (guix utils)
   #:use-module (gnu packages mail)
   #:use-module (gnu packages databases))

 (define-public my-mutt
     (inherit mutt)
     (name "my-mutt")
         (inputs (cons `("gdbm" ,gdbm) (package-inputs mutt)))
      (substitute-keyword-arguments (package-arguments mutt)
        ((#:configure-flags cf)
         `(cons "--enable-hcache" ,cf))))
     (synopsis (string-append (package-synopsis mutt)
                              " (configured with --enable-hcache)"))))

On Sat, Mar 12, 2016 at 11:13:06AM +0300, Alex Kost wrote:
> Jean Louis (2016-03-11 21:48 +0300) wrote:
> > Hello Alex,
> >
> > I got your mutt file, for my-guix-packages, but now I see I
> > need to learn Guile commands, I will do this somewhat later
> > when I have working system. Please help me until then, as
> > your style to make a modified package is excellent for me.
> It is not my style :-) Package inheriting is a great feature of Guix,
> it's just not documented (though "inherit" word can be met in the
> manual several times).
> > I guess you forgot the dependency gdbm, where to put it?
> Sorry about that, but actually I didn't forget about it because I didn't
> know it is needed (I've never used mutt, and I know nothing about it or
> gdbm).  Do you mean this dependency is needed because of --enable-hcache
> option?
> If so, then it can be added by adding gdbm to the inputs of my-mutt
> package (see below).  Also (my-guix-packages) module need to use (gnu
> packages databases), because gdbm package comes from this module.
> I hope the following comments clarify how my-mutt package is made:
> >  (define-module (my-guix-packages)
> >    #:use-module (guix packages)
> >    #:use-module (guix download)
> >    #:use-module (guix utils)
> Don't forget to add this line here:
>      #:use-module (gnu packages databases)
> >    #:use-module (gnu packages mail))
> >
> >  (define-public my-mutt
> >    (package
> >      (inherit mutt)
> Inheriting means: those package fields that are not specified, will be
> taken from mutt package.  For example, the package name is changed (to
> "my-mutt"), but the version is not, so it will be inherited.  This means
> when the version of mutt package will be updated, the version of my-mutt
> package will automatically be updated too.
> >      (name "my-mutt")
> >      (arguments
> >       (substitute-keyword-arguments (package-arguments mutt)
> >         ((#:configure-flags cf)
> >          `(cons "--enable-hcache" ,cf))))
> This means: take mutt's arguments and do some substitutions there.  In
> particular, we modify configure-flags by adding "--enable-hcache" to
> them.
> To add gdbm dependency, add the following line to the package
> definition:
>        (inputs (cons `("gdbm" ,gdbm) (package-inputs mutt)))
> >      (synopsis (string-append (package-synopsis mutt)
> >                               " (configured with --enable-hcache)"))))
> Modifying synopsis is not needed, it is just what you see in the output
> of "guix package --show=my-mutt" command.
> -- 
> Alex

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