1 files changed, 62 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/tools/metals/default.nix b/nixpkgs/pkgs/development/tools/metals/default.nix
new file mode 100644
index 000000000000..729ab88c680b
--- /dev/null
+++ b/nixpkgs/pkgs/development/tools/metals/default.nix
@@ -0,0 +1,62 @@
+{ stdenv, lib, coursier, jdk, jre, makeWrapper }:
+
+stdenv.mkDerivation rec {
+  pname = "metals";
+  version = "0.9.10";
+
+  deps = stdenv.mkDerivation {
+    name = "${pname}-deps-${version}";
+    buildCommand = ''
+      export COURSIER_CACHE=$(pwd)
+      ${coursier}/bin/coursier fetch org.scalameta:metals_2.12:${version} \
+        -r bintray:scalacenter/releases \
+        -r sonatype:snapshots > deps
+      mkdir -p $out/share/java
+      cp -n $(< deps) $out/share/java/
+    '';
+    outputHashMode = "recursive";
+    outputHashAlgo = "sha256";
+    outputHash     = "1i91jq1p27kkzxk57mm438sablnrx8j5pfyl0yg64wzrashba1xa";
+  };
+
+  nativeBuildInputs = [ makeWrapper ];
+  buildInputs = [ jdk deps ];
+
+  phases = [ "installPhase" ];
+
+  extraJavaOpts = "-XX:+UseG1GC -XX:+UseStringDeduplication -Xss4m -Xms100m";
+
+  installPhase = ''
+    mkdir -p $out/bin
+
+    # This variant is not targeted at any particular client, clients are
+    # expected to declare their supported features in initialization options.
+    makeWrapper ${jre}/bin/java $out/bin/metals \
+      --prefix PATH : ${lib.makeBinPath [ jdk ]} \
+      --add-flags "${extraJavaOpts} -cp $CLASSPATH scala.meta.metals.Main"
+
+    # Further variants targeted at clients with featuresets pre-set.
+    makeWrapper ${jre}/bin/java $out/bin/metals-emacs \
+      --prefix PATH : ${lib.makeBinPath [ jdk ]} \
+      --add-flags "${extraJavaOpts} -Dmetals.client=emacs -cp $CLASSPATH scala.meta.metals.Main"
+
+    makeWrapper ${jre}/bin/java $out/bin/metals-vim \
+      --prefix PATH : ${lib.makeBinPath [ jdk ]} \
+      --add-flags "${extraJavaOpts} -Dmetals.client=coc.nvim -cp $CLASSPATH scala.meta.metals.Main"
+
+    makeWrapper ${jre}/bin/java $out/bin/metals-vim-lsc \
+      --prefix PATH : ${lib.makeBinPath [ jdk ]} \
+      --add-flags "${extraJavaOpts} -Dmetals.client=vim-lsc -cp $CLASSPATH scala.meta.metals.Main"
+
+    makeWrapper ${jre}/bin/java $out/bin/metals-sublime \
+      --prefix PATH : ${lib.makeBinPath [ jdk ]} \
+      --add-flags "${extraJavaOpts} -Dmetals.client=sublime -cp $CLASSPATH scala.meta.metals.Main"
+  '';
+
+  meta = with lib; {
+    homepage = "https://scalameta.org/metals/";
+    license = licenses.asl20;
+    description = "Work-in-progress language server for Scala";
+    maintainers = with maintainers; [ ceedubs tomahna ];
+  };
+}