Adding multiple versions of sbt. Probably you want to use the latest(default).

pkgs/development/tools/build-managers/simple-build-tool/default.nix

@@ -1,41 +1,93 @@
-{ stdenv, fetchurl }:
+{ stdenv, versionedDerivation, fetchurl, version ? "xsbt-0.12.3" }:
+
+let
+
+      description = "A build tool for Scala";
+      longDescription = name: ''
+        ${name} is a simple build tool for Scala projects that aims to do the
+        basics well.
+
+        This package is the sbt launcher which automatically manages
+        and downloads dependencies, including the SBT package and the
+        Scala compiler.
+      '';
+
+      metaSBT = {
+        inherit description;
+        longDescription = longDescription "sbt";
+        homepage = http://code.google.com/p/simple-build-tool/;
+        license = "bsd";
+      };
+
+      metaXSBT = {
+        inherit description;
+        longDescription = longDescription "xsbt";
+        homepage = https://github.com/harrah/xsbt;
+        license = "bsd";
+      };
+
+in
 
 # Depends on a JRE at runtime.
 
-let
+versionedDerivation "simple-build-tool" version {
-  version = "0.7.3";
+  "0.7.3" = let version = "0.7.3"; in {
-in
-  stdenv.mkDerivation rec {
     name = "simple-build-tool-${version}";
     src = fetchurl {
       url = "http://simple-build-tool.googlecode.com/files/sbt-launch-${version}.jar";
       sha256 = "1nciifzf00cs54a4h57a7v1hyklm5vgln0sscmz5kzv96ggphs6k";
     };
+    meta = metaSBT;
+  };
 
-    installPhase = ''
+  "0.7.7" = let version = "0.7.7"; in {
-      mkdir -pv "$out/lib/java"
+    name = "simple-build-tool-${version}";
-      cp $src "$out/lib/java/sbt-launch-${version}.jar"
+    src = fetchurl {
-      mkdir -p "$out/bin"
+      url = "http://simple-build-tool.googlecode.com/files/sbt-launch-${version}.jar";
-      cat > "$out/bin/sbt" <<EOF
+      # sha256 = "1nciifzf00cs54a4h57a7v1hyklm5vgln0sscmz5kzv96ggphs6j";
-      #! /bin/sh
+      sha256 = "2720b033012a7509f7fbdfddfa69c07b105452a6f95bc410cb7dc34c1594ab3d";
-      exec java -jar $out/lib/java/sbt-launch-${version}.jar "\$@"
-      EOF
-      chmod u+x "$out/bin/sbt"
-    '';
-
-    phases = "installPhase";
-
-    meta = {
-      description = "A build tool for Scala";
-      longDescription = ''
-        sbt is a simple build tool for Scala projects that aims to do the
-        basics well.
-
-	This package is the sbt launcher which automatically manages
-	and downloads dependencies, including the SBT package and the
-	Scala compiler.
-      '';
-      homepage = http://code.google.com/p/simple-build-tool/;
-      license = "bsd";
     };
-  }
+    meta = metaSBT;
+  };
+
+  "xsbt-0.11.2" = let version = "0.11.2"; in { # scala 2.9
+    name = "xsbt-${version}";
+
+    # scala needs much more PermGen space
+    javaArgs = "-Xmx1024M";
+    # from https://github.com/harrah/xsbt/wiki/Getting-Started-Setup
+    src = fetchurl {
+      url = http://typesafe.artifactoryonline.com/typesafe/ivy-releases/org.scala-tools.sbt/sbt-launch/0.11.2/sbt-launch.jar;
+      sha256 = "14fbzvb1s66wpbqznw65a7nn27qrq1i9pd7wlbydv8ffl49d262n";
+    };
+    meta = metaXSBT;
+  };
+
+  "xsbt-0.12.3" = let version = "0.12.3"; in {
+    name = "xsbt-${version}";
+
+    # scala needs much more PermGen space
+    javaArgs = "-Xmx1024M";
+    # from https://github.com/harrah/xsbt/wiki/Getting-Started-Setup
+    src = fetchurl {
+      url = http://repo.typesafe.com/typesafe/ivy-releases/org.scala-sbt/sbt-launch/0.12.3/sbt-launch.jar;
+      sha256 = "11r26abjzmnmpn65ndbq60qg31s3ichkvzpmxyrq941s1n1dbxgh";
+    };
+    meta = metaXSBT;
+  };
+}
+{
+
+  installPhase = ''
+    mkdir -pv "$out/lib/java"
+    cp $src "$out/lib/java/sbt-launch-${version}.jar"
+    mkdir -p "$out/bin"
+    cat > "$out/bin/sbt" <<EOF
+    #! /bin/sh
+    exec java $javaArgs -jar $out/lib/java/sbt-launch-${version}.jar "\$@"
+    EOF
+    chmod u+x "$out/bin/sbt"
+  '';
+
+  phases = "installPhase";
+}