logisim: cleanup

pkgs/applications/science/logic/logisim/default.nix

@@ -1,29 +1,28 @@
 { lib, stdenv, fetchurl, jre, makeWrapper }:
 
-let version = "2.7.1"; in
-
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   pname = "logisim";
-  inherit version;
+  version = "2.7.1";
 
   src = fetchurl {
-    url = "mirror://sourceforge/project/circuit/2.7.x/${version}/logisim-generic-${version}.jar";
+    url = "mirror://sourceforge/project/circuit/${lib.versions.majorMinor version}.x/${version}/logisim-generic-${version}.jar";
     sha256 = "1hkvc9zc7qmvjbl9579p84hw3n8wl3275246xlzj136i5b0phain";
   };
 
   phases = [ "installPhase" ];
 
-  nativeBuildInputs = [makeWrapper];
+  nativeBuildInputs = [ makeWrapper ];
 
   installPhase = ''
-    mkdir -pv $out/bin
+    mkdir -p $out/bin
     makeWrapper ${jre}/bin/java $out/bin/logisim --add-flags "-jar $src"
   '';
 
-  meta = {
+  meta = with lib; {
     homepage = "http://ozark.hendrix.edu/~burch/logisim";
     description = "Educational tool for designing and simulating digital logic circuits";
-    license = lib.licenses.gpl2Plus;
-    platforms = lib.platforms.unix;
+    maintainers = with maintainers; [ ];
+    license = licenses.gpl2Plus;
+    platforms = platforms.unix;
   };
 }