migrate ponylang to nix

runtimes/default.nix

@@ -25,4 +25,5 @@ args: {
     "racket" = import ./racket.nix args;
     "powershell" = import ./powershell.nix args;
     "prolog" = import ./prolog.nix args;
+    "ponylang" = import ./ponylang.nix args;
 }

runtimes/ponylang.nix

@@ -0,0 +1,37 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.ponyc; 
+in piston.mkRuntime {
+    language = "ponylang";
+    version = pkg.version;
+    aliases = [
+        "pony"
+        "ponyc"
+    ];
+
+    compile = ''
+        rename 's/$/.pony/' "$@" # Add .pony extension
+        ${pkg}/bin/ponyc -b out
+    '';
+
+    run = ''
+        shift
+        ./out "$@"
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.pony" = ''
+                    actor Main
+                        new create(env: Env) =>
+                            env.out.print("OK")
+                '';
+            };
+            args = [];
+            stdin = "";
+            packages = [];
+            main = "test.pony";
+        })
+    ];
+}