[Nix-dev] Ruby Development on Nix

[Freddy Rietdijk]

Hi Taeer,

For instance, the python model of
>   python27Packages.package1
>   python27Packages.package2
> is very different from the haskell model of
>   (haskellPackages.ghcWithPackages (h: with h; [
>     package1
>     package2
>   ])


Actually, they're quite similar. For Python we also have `python.buildEnv`
and `python.withPackages` of which the use is identical to your Haskell
example. In certain cases it is possible to install or use individual
Python packages but using `python.buildEnv` or `python.withPackages`
generally works better.



On Fri, Jul 15, 2016 at 9:41 PM, Taeer Bar-Yam <tb442 at cornell.edu> wrote:

> Dear Knowledgable Nixers,
>
> *Introduction*
> I have been trying to get ruby gems installed in any way on my nixos
> machine. I have been reading up on the wikis, and I understand that this is
> not yet well put together. However, it seems that even things that aught to
> be working are not.
>
> *Problem*
> I put "bundler" in my configuration.nix, and it installs fine. However,
> when I try to actually run it, I get the error message:
> /nix/store/n5gqlhs1nmadxkbibv42wnxq3m7f404k-ruby-2.3.0-p0/lib/ruby/2.3.0/rubygems.rb:241:in
> `bin_path': can't find gem bundler (>= 0) (Gem::GemNotFoundException)
>         from /run/current-system/sw/bin/bundler:14:in `<main>'
>
> I tried to add the gem I wanted to my configuration.nix directly using
> buildRubyGem, but ruby was not able to find it.
>
> The method the manual prescribes is dependent on already having bundler
> installed, so I have not had a chance to test that.
>
> *Request/Solution*
> I am interested in contributing to the nix community by developing a
> better system for ruby gem installation, so I guess what I am looking for
> is the following:
>
> 1) For now, what is the current simplest way to install a ruby gem so that
> I can, in the terminal, type
> $ irb
> > require 'desired_gem'
> and it will work?
> This can include simply installing bundler and using that locally with a
> gemfile, but I would prefer that any system-wide installation be done
> through configuration.nix
>
> 2) If I'm going to add a system for installing ruby gems, what would be
> the right way to design it? I understand that programming languages
> sometimes have structure that prevents us from always using the ideal path,
> so can y'all point me to a programming language that is considered "done
> right"?
>
> For instance, the python model of
>   python27Packages.package1
>   python27Packages.package2
>
> is very different from the haskell model of
>   (haskellPackages.ghcWithPackages (h: with h; [
>     package1
>     package2
>   ])
> My understanding is that the haskell model is a less-than-ideal kludge
> because haskell wont allow the python method. Is that right? Is there an
> even better way than python?
>
> Lastly, is there anyone already working on this that I should get in touch
> with instead of splitting efforts?
>
> Thank you,
>   --Taeer
>
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>
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