nixpkgs/pkgs/development/tools/misc/chruby/default.nix

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{ stdenv, lib, fetchFromGitHub, runCommand, rubies ? null }:
let
rubiesEnv = runCommand "chruby-env" { preferLocalBuild = true; } ''
mkdir $out
${lib.concatStrings
(lib.mapAttrsToList (name: path: "ln -s ${path} $out/${name}\n") rubies)}
'';
in stdenv.mkDerivation rec {
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name = "chruby-${version}";
version = "0.3.9";
src = fetchFromGitHub {
owner = "postmodern";
repo = "chruby";
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rev = "v${version}";
sha256 = "1894g6fymr8kra9vwhbmnrcr58l022mcd7g9ans4zd3izla2j3gx";
};
phases = [ "unpackPhase" "patchPhase" "installPhase" "fixupPhase" ];
patches = lib.optionalString (rubies != null) [
./env.patch
];
postPatch = lib.optionalString (rubies != null) ''
substituteInPlace share/chruby/chruby.sh --replace "@rubiesEnv@" ${rubiesEnv}
'';
installPhase = ''
mkdir $out
cp -r bin $out
cp -r share $out
'';
meta = with lib; {
description = "Changes the current Ruby";
homepage = https://github.com/postmodern/chruby;
license = licenses.mit;
platforms = platforms.unix;
maintainers = with maintainers; [ cstrahan ];
};
}