add piston nix pkg for scala

packages/scala/3.0.0/build.sh

@@ -1,11 +0,0 @@
-#!/usr/bin/env bash
-
-# Download and extract JDK8
-curl -L "https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u292-b10/OpenJDK8U-jdk_x64_linux_hotspot_8u292b10.tar.gz" -o jdk.tar.gz
-tar xzf jdk.tar.gz --strip-components=1
-rm jdk.tar.gz
-
-# Download and extract Scala 3
-curl -L "https://github.com/lampepfl/dotty/releases/download/3.0.0/scala3-3.0.0.tar.gz" -o scala.tar.gz
-tar -xzf scala.tar.gz --strip-components=1
-rm scala.tar.gz

packages/scala/3.0.0/compile

@@ -1,15 +0,0 @@
-#!/usr/bin/env bash
-
-# Compile scala classes into a jar file
-scalac "$@" -d out.jar
-
-# Create the Manifest and include scala lib jars:
-# NOTE: - entry point will only consider @main and App traits from the main file
-#       - scala lib jars will be added to the class path in order to run the jar properly
-echo "Main-Class: $(grep -oP '\@main\s+def\s+\K[a-zA-Z][a-zA-Z0-9]*|object\s+\K[a-zA-Z][a-zA-Z0-9]*(?=\s+extends\s+App)' $1)
-Class-Path:  $(echo $JAVA_HOME/lib/*.jar | sed 's/\s/\n  /g')
-
-" > manifest.txt
-
-# Update the jar with the manifest
-jar ufm out.jar manifest.txt

packages/scala/3.0.0/environment

@@ -1,5 +0,0 @@
-#!/usr/bin/env bash
-
-# Scala requires JAVA_HOME to be set
-export JAVA_HOME=$PWD
-export PATH=$PWD/bin:$PATH

packages/scala/3.0.0/metadata.json

@@ -1,5 +0,0 @@
-{
-    "language": "scala",
-    "version": "3.0.0",
-    "aliases": ["sc"]
-}

packages/scala/3.0.0/run

@@ -1,5 +0,0 @@
-#!/usr/bin/env bash
-
-# Run jar file
-shift
-java -jar out.jar "$@"

packages/scala/3.0.0/test.scala

@@ -1,3 +0,0 @@
-@main def run(): Unit = {
-  println("OK")
-}

runtimes/default.nix

@@ -60,4 +60,5 @@ args: {
     "fpc-pascal" = import ./fpc-pascal.nix args;
     "brainfuck" = import ./brainfuck.nix args;
     "node-coffeescript" = import ./node-coffeescript.nix args;
+    "jvm-scala" = import ./jvm-scala.nix args;
 }

runtimes/jvm-scala.nix

@@ -0,0 +1,54 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.scala;
+    java = pkgs.jdk8;
+    sed = pkgs.gnused;
+in piston.mkRuntime {
+    language = "scala";
+    version = pkg.version;
+    runtime = "jvm";
+
+    aliases = [
+        "sc"
+    ];
+
+    compile = ''
+        # Compile scala classes into a jar file
+        ${pkg}/bin/scalac "$@" -d out.jar
+
+        # Capture extra class-path libraries
+        java_libs="$(echo ${java}/lib/openjdk/lib/*.jar | ${sed}/bin/sed 's/\s/\\n  /g')"
+        scala_libs="$(echo ${pkg}/lib/*.jar | ${sed}/bin/sed 's/\s/\\n  /g')"
+
+        echo -e "Class-Path:  $java_libs
+          $scala_libs
+        " > classPath
+
+        # Update the jar manifest with scala libs
+        ${java}/bin/jar umf classPath out.jar
+    '';
+
+    run = ''
+        # Run jar from compile
+        shift
+        ${java}/bin/java -jar out.jar "$@"
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.sc" = ''
+                    object Main {
+                        def main(args: Array[String]) = {
+                            println("OK")
+                        }
+                    }
+                '';
+            };
+            args = [];
+            stdin = "";
+            packages = [];
+            main = "test.sc";
+        })
+    ];
+}