Add lolcat, a rainbow version of cat

Closes #3399

pkgs/tools/misc/lolcat/Gemfile

@@ -0,0 +1,2 @@
+source "http://rubygems.org"
+gem "lolcat"

pkgs/tools/misc/lolcat/Gemfile.lock

@@ -0,0 +1,14 @@
+GEM
+  remote: http://rubygems.org/
+  specs:
+    lolcat (42.1.0)
+      paint (~> 0.8.3)
+      trollop (~> 1.16.2)
+    paint (0.8.7)
+    trollop (1.16.2)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  lolcat

pkgs/tools/misc/lolcat/default.nix

@@ -0,0 +1,18 @@
+{ stdenv, lib, bundlerEnv, gpgme, ruby, ncurses, writeText, zlib, xapian
+, pkgconfig, which }:
+
+bundlerEnv {
+  name = "lolcat-42.1.0";
+
+  inherit ruby;
+  gemfile = ./Gemfile;
+  lockfile = ./Gemfile.lock;
+  gemset = ./gemset.nix;
+
+  meta = with lib; {
+    description = "A rainbow version of cat";
+    homepage    = https://github.com/busyloop/lolcat;
+    license     = licenses.wtfpl;
+    maintainers = with maintainers; [ pSub ];
+  };
+}

pkgs/tools/misc/lolcat/gemset.nix

@@ -0,0 +1,27 @@
+{
+  "lolcat" = {
+    version = "42.1.0";
+    source = {
+      type = "gem";
+      sha256 = "1jp0g7k958dg709dm1qs7nr8dmi4vlgvmcvqcr1zhk8ygx89rwgc";
+    };
+    dependencies = [
+      "paint"
+      "trollop"
+    ];
+  };
+  "paint" = {
+    version = "0.8.7";
+    source = {
+      type = "gem";
+      sha256 = "0nl1x0190d44bfczlxdy16gxsvm95y14kxv3k9n92h9ap2zvdyd8";
+    };
+  };
+  "trollop" = {
+    version = "1.16.2";
+    source = {
+      type = "gem";
+      sha256 = "0frrp90dw266h3kf9g925dppir9l7p8jxknw6dn5nz6fa6c4g5lg";
+    };
+  };
+}

pkgs/top-level/all-packages.nix

@@ -1885,6 +1885,8 @@ let
 
   logstash-forwarder = callPackage ../tools/misc/logstash-forwarder { };
 
+  lolcat = callPackage ../tools/misc/lolcat { };
+
   lsdvd = callPackage ../tools/cd-dvd/lsdvd {};
 
   kippo = callPackage ../servers/kippo { };