feat: Installation instructions for Nix users

[de-abreu]

💡 Summary

Provide instuctions on how this plugin could be installed using the Nix package manager.

🗨 Details

One is able to fetch the plugin with instructions provided in the NixOS wiki, but not run any of the following steps (probably an isntallation using python is involved?).

[Realiserad]

I'm not very familiar with NixOS. What does your configuration.nix file look like at the moment?

You should be able to fetch the plugin from GitHub using:

{
  name = "fish-ai";
  src = pkgs.fetchFromGitHub {
    owner = "realiserad";
    repo = "fish-ai";
    rev = "v1.8.0";
    sha256 = "03ja4q30br68vsa02772vb4m7warjyd32w57mzqipxssr16h0b2b";
  };
}

After Nix has copied over the relevant files, you should be able to manually set it up by invoking _fish_ai_install. This function will set up a Python virtual environment for the plugin, so here you need Python with virtualenv and pip.

[Termux-Masters]

You also need fisher to make it work. First of all Download home-manager if you don't have. And install fisher and fish-ai with:

{ pkgs, ... }:
{
  programs.fish = {
    enable = true;
    plugins = [
      {
        name = "fisher";
        src = pkgs.fetchFromGithub {
          owner = "jorgebucaran";
          repo = "fisher";
          rev = "1f0dc2b4970da160605638cb0f157079660d6e04";
          hash = "sha256-pR5RKU+zIb7CS0Y6vjx2QIZ8Iu/3ojRfAcAdjCOxl1U=";
        };   
      }
      {
        name = "fish-ai";
        src = pkgs.fetchFromGithub {
          owner = "realiserad";
          repo = "fish-ai";
          rev = "0ny0vi6wh0q70kfim0qhcyrwmrvfb9wq04d1phwjjvgpqkznwfpl";
          hash = "sha256-9Dpu/8T3bSk5vKERgHlabufKs2cQgxrdBAcDyE3cwFs=";
        };
      }
    ];
  };
}

And install following packages:

environment.systemPackages = with pkgs; [
  python3
  python3Packages.pip
  # Already Installed by system (add them if in case of some curl or grep error)
  curl
  gnutar
  gnugrep
  gzip
];

hash and rev values might be changed because of new releases and these are the hash and rev values of the current versions. To check for new releases install nix-prefetch-git.

And run this for fisher:

nix-prefetch-git https://github.com/jorgebucaran/fisher

And this for fish-ai:

nix-prefetch-git https://github.com/realiserad/fish-ai