Add a lejos package

nix/.config/nixpkgs/overlays/02-extrapkgs.nix

@@ -5,6 +5,7 @@ self: super: {
   peageprint = super.callPackage ../pkgs/peageprint.nix {};
   nottetris2 = super.callPackage ../pkgs/nottetris2.nix {};
   mailpile = super.callPackage ../pkgs/mailpile.nix {};
+  lejos = super.callPackage ../pkgs/lejos.nix {};
   libinput-gestures = super.callPackage ../pkgs/libinput-gestures.nix {};
   gitFire = super.stdenv.mkDerivation {
     src = super.fetchFromGitHub {

nix/.config/nixpkgs/pkgs/lejos.nix

@@ -0,0 +1,45 @@
+{ jdk, ant, libusb, makeWrapper, stdenv, lib, fetchurl }:
+let lejospkg = type: attrs:
+    stdenv.mkDerivation ({
+    name = "lejos-${type}-${attrs.version}";
+    JDK_PATH = jdk;
+    buildPhase = ''
+        pushd build
+        ant
+        popd
+    '';
+    installPhase = ''
+        runHook preInstall
+        mkdir -p $out/opt/lejos/${type} $out/bin
+        cp -r * $out/opt/lejos/${type}
+        for i in $(find $out/opt/lejos/${type}/bin/* -executable); do
+            makeWrapper $i $out/bin/`basename $i` --set JAVA_HOME $JDK_PATH \
+            --set ${lib.toUpper type}_HOME $out/opt/lejos/${type}
+        done
+        runHook postInstall
+    '';
+    buildInputs = [ jdk ant libusb makeWrapper ];
+} // attrs);
+in
+{
+
+  nxj = lejospkg "nxj" rec {
+    version = "0.9.1beta-3";
+    src = fetchurl { 
+  	  url  = "mirror://sourceforge/nxt.lejos.p/${version}/leJOS_NXJ_${version}.tar.gz";
+  	  sha256 = "18ll9phbl1i2dasici1m8jprcfhzl03dq0h1dsdl9iwq1yv380pi";
+    };
+  };
+  ev3 = lejospkg "ev3" rec {
+    version = "0.9.1-beta";
+    src = fetchurl {
+  	  url  = "mirror://sourceforge/ev3.lejos.p/${version}/leJOS_EV3_${version}.tar.gz";
+  	  sha256 = "12v5za15xijq8frsvrf1amr75jf80c593xdpplcx5l4rxhb3bprp";
+    };
+    buildPhase = "echo binary distribution";
+    postPatch = ''
+      mkdir -p $out/share/java
+      cp $(find . -iname '*.jar') $out/share/java
+    '';
+  };
+}