ammonite: add scala-2.13 version

pkgs/development/tools/ammonite/default.nix

···
-{ stdenv, lib, fetchurl, makeWrapper, jre, gnused
+{ stdenv, fetchurl, jre
 , disableRemoteLogging ? true
 }:
 
 with stdenv.lib;
+
+let
+common = { scalaVersion, sha256 }:
 stdenv.mkDerivation rec {
   pname = "ammonite";
   version = "1.7.1";
-  scalaVersion = "2.12";
 
   src = fetchurl {
     url = "https://github.com/lihaoyi/Ammonite/releases/download/${version}/${scalaVersion}-${version}";
-    sha256 = "0isg9flnzc2ldbx6q0lg0xyg9lnvqkd8qhgfln8p1hbzdq0n6jd0";
+    inherit sha256;
   };
 
-  propagatedBuildInputs = [ jre ] ;
-  buildInputs = [ makeWrapper gnused ] ;
-
   phases = "installPhase";
 
   installPhase = ''
-    mkdir -p $out/bin
-    cp ${src} $out/bin/amm
-    chmod +x $out/bin/amm
-    ${gnused}/bin/sed -i '0,/java/{s|java|${jre}/bin/java|}' $out/bin/amm
+    install -Dm755 ${src} $out/bin/amm
+    sed -i '0,/java/{s|java|${jre}/bin/java|}' $out/bin/amm
   '' + optionalString (disableRemoteLogging) ''
-    ${gnused}/bin/sed -i '0,/ammonite.Main/{s|ammonite.Main|ammonite.Main --no-remote-logging|}' $out/bin/amm
+    sed -i '0,/ammonite.Main/{s|ammonite.Main|ammonite.Main --no-remote-logging|}' $out/bin/amm
   '';
 
   meta = {
···
         that may be familiar to people coming from IDEs or other REPLs such as IPython or Zsh.
     '';
     homepage = http://www.lihaoyi.com/Ammonite/;
-    license = lib.licenses.mit;
-    platforms = lib.platforms.all;
-    maintainers = [ lib.maintainers.nequissimus ];
+    license = licenses.mit;
+    platforms = platforms.all;
+    maintainers = [ maintainers.nequissimus ];
   };
+};
+in {
+  ammonite_2_12 = common { scalaVersion = "2.12"; sha256 = "0isg9flnzc2ldbx6q0lg0xyg9lnvqkd8qhgfln8p1hbzdq0n6jd0"; };
+  ammonite_2_13 = common { scalaVersion = "2.13"; sha256 = "01dyc6bilhcr1mwrpmhjc8nhzfqgjh44bx36gd3gk9mkvlbys5mp"; };
 }

pkgs/top-level/all-packages.nix

···
     inherit (darwin.apple_sdk.frameworks) Security;
   };
 
-  ammonite = callPackage ../development/tools/ammonite {};
+  inherit (callPackages ../development/tools/ammonite {})
+    ammonite_2_12
+    ammonite_2_13;
+  ammonite = if scala == scala_2_12 then ammonite_2_12 else ammonite_2_13;
 
   amp = callPackage ../applications/editors/amp {};