From aa162b388de4a65961a1edc87d8ccf820138e565 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Domen=20Ko=C5=BEar?= <domen@dev.si>
Date: Fri, 12 Sep 2014 00:26:13 +0200
Subject: [PATCH] package gim-nix and document it

---
 doc/language-support.xml                      | 11 +++++++++
 .../interpreters/ruby/rubygems.nix            |  8 +------
 .../package-management/gem-nix/default.nix    | 23 +++++++++++++++++++
 pkgs/top-level/all-packages.nix               |  2 ++
 4 files changed, 37 insertions(+), 7 deletions(-)
 create mode 100644 pkgs/tools/package-management/gem-nix/default.nix

diff --git a/doc/language-support.xml b/doc/language-support.xml
index f5e89df57fcc..117e1d93c152 100644
--- a/doc/language-support.xml
+++ b/doc/language-support.xml
@@ -233,6 +233,17 @@ twisted = buildPythonPackage {
 </section>
 
 
+<section xml:id="ssec-language-java"><title>Ruby</title>
+  <para>For example, to package yajl-ruby package, use gem-nix:</para>
+  
+  <screen>
+    $ nix-env -i gem-nix
+    $ gem-nix --no-user-install --nix-file=pkgs/development/interpreters/ruby/generated.nix yajl-ruby
+    $ nix-build -A rubyLibs.yajl-ruby
+  </screen>
+</section>
+
+
 <section xml:id="ssec-language-java"><title>Java</title>
 
 <para>Ant-based Java packages are typically built from source as follows:
diff --git a/pkgs/development/interpreters/ruby/rubygems.nix b/pkgs/development/interpreters/ruby/rubygems.nix
index 13829c3f9f6a..3b66464ce223 100644
--- a/pkgs/development/interpreters/ruby/rubygems.nix
+++ b/pkgs/development/interpreters/ruby/rubygems.nix
@@ -29,13 +29,7 @@ rec {
     longDescription = ''
       Nix can create nix packages from gems.
 
-      To use it do the following:
-      1. Install rubygems and rubyLibs.nix.
-      2. Add $your_profile/${ruby.gemPath} to GEM_PATH.
-      3. export RUBYLIB=$your_profile/lib RUBYOPT=rubygems.
-      4. Run `gem nix --[no-]user-install gem1 gem2 ...` to generate Nix
-      expression from gem repository.
-      5. Install rubyLibs.gem1 etc.
+      To use it by installing gem-nix package.
     '';
   };
 
diff --git a/pkgs/tools/package-management/gem-nix/default.nix b/pkgs/tools/package-management/gem-nix/default.nix
new file mode 100644
index 000000000000..de5f3a9e0444
--- /dev/null
+++ b/pkgs/tools/package-management/gem-nix/default.nix
@@ -0,0 +1,23 @@
+{ stdenv, rubygems, rubyLibs, ruby, makeWrapper }:
+
+stdenv.mkDerivation rec {
+  name = "gem-nix";
+
+  buildInputs = [ ruby rubygems rubyLibs.nix makeWrapper ];
+
+  phases = ["installPhase"];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    echo 'exec ${rubygems}/bin/gem nix "$@"' >> $out/bin/gem-nix
+    chmod +x $out/bin/gem-nix
+    wrapProgram $out/bin/gem-nix \
+      --set GEM_PATH $GEM_PATH
+  '';
+
+  meta = with stdenv.lib; {
+    description = "gem nix command in a nice wrapper";
+    platforms = platforms.linux;
+    maintainers = [ maintainers.iElectric ];
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 22ac7822cfca..5e49547b9dc7 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -3087,6 +3087,8 @@ let
 
   fsharp = callPackage ../development/compilers/fsharp {};
 
+  gem-nix = callPackage ../tools/package-management/gem-nix { };
+
   go_1_0 = callPackage ../development/compilers/go { };
 
   go_1_1 =