push sheeet

pkgs/development/tools/misc/watson-ruby/Gemfile

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+source 'https://rubygems.org'
+gem 'watson-ruby'

pkgs/development/tools/misc/watson-ruby/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    json (2.1.0)
+    watson-ruby (1.6.3)
+      json
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  watson-ruby
+
+BUNDLED WITH
+   2.1.4

pkgs/development/tools/misc/watson-ruby/default.nix

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+{
+  lib,
+  stdenv,
+  bundlerEnv,
+  ruby,
+  bundlerUpdateScript,
+}:
+
+stdenv.mkDerivation rec {
+  pname = "watson-ruby";
+  version = (import ./gemset.nix).watson-ruby.version;
+
+  dontUnpack = true;
+
+  installPhase =
+    let
+      env = bundlerEnv {
+        name = "watson-ruby-gems-${version}";
+        inherit ruby;
+        # expects Gemfile, Gemfile.lock and gemset.nix in the same directory
+        gemdir = ./.;
+      };
+    in
+    ''
+      mkdir -p $out/bin
+      ln -s ${env}/bin/watson $out/bin/watson
+    '';
+
+  passthru.updateScript = bundlerUpdateScript "watson-ruby";
+
+  meta = with lib; {
+    description = "Inline issue manager";
+    homepage = "https://goosecode.com/watson/";
+    license = with licenses; mit;
+    maintainers = with maintainers; [
+      robertodr
+      nicknovitski
+    ];
+    mainProgram = "watson";
+    platforms = platforms.unix;
+  };
+}

pkgs/development/tools/misc/watson-ruby/gemset.nix

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+{
+  json = {
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "01v6jjpvh3gnq6sgllpfqahlgxzj50ailwhj9b3cd20hi2dx0vxp";
+      type = "gem";
+    };
+    version = "2.1.0";
+  };
+  watson-ruby = {
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "1d5m29nr0i030q8ygmbapwri5ndcg2q6lf8a15bk79lfcp9xyj9w";
+      type = "gem";
+    };
+    version = "1.6.3";
+  };
+}