[Nix-dev] Ruby Development on Nix

[Taeer Bar-Yam]

Oh. Huh. That's very good to know, thank you. So is that the preferred nix model for programming language packages then?
  --Taeer
> On Jul 15, 2016, at 4:05 PM, Freddy Rietdijk <freddyrietdijk at fridh.nl> wrote:
> 
> 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 <mailto: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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