add vlang

runtimes/default.nix

@@ -14,6 +14,7 @@ args: {
     "erlang" = import ./erlang.nix args;
     "gawk-awk" = import ./gawk-awk.nix args;
     "openjdk11_headless-java" = import ./openjdk11_headless-java.nix args;
-    "zig" = import ./zig.nix args;
     "ruby" = import ./ruby.nix args;
+    "zig" = import ./zig.nix args;
+    "vlang" = import ./vlang.nix args;
 }

runtimes/vlang.nix

@@ -0,0 +1,40 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.vlang;
+in piston.mkRuntime {
+    language = "vlang";
+    version = pkg.version;
+
+    aliases = [
+        "v"
+    ];
+
+    run = ''
+        # vlang env
+        export VMODULES="$PWD"
+        export TMPDIR="$PWD"
+
+        # modify file extension
+        mv "$1" "$1.v"
+        filename="$1.v"
+        shift
+
+        ${pkg}/bin/v run "$filename" "$@"
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "file0.code" = ''
+                    fn main() {
+                        println('OK')
+                    }
+                '';
+            };
+            args = [];
+            stdin = "";
+            packages = [];
+            main = "file0.code";
+        })
+    ];
+}