add piston nix pkg for go

packages/go/1.16.2/build.sh

@@ -1,5 +0,0 @@
-#!/usr/bin/env bash
-curl -LO https://golang.org/dl/go1.16.2.linux-amd64.tar.gz
-tar -xzf go1.16.2.linux-amd64.tar.gz
-rm go1.16.2.linux-amd64.tar.gz
-

packages/go/1.16.2/environment

@@ -1,2 +0,0 @@
-export PATH=$PWD/go/bin:$PATH
-export GOPATH=$PWD/gopath

packages/go/1.16.2/metadata.json

@@ -1,5 +0,0 @@
-{
-    "language": "go",
-    "version": "1.16.2",
-    "aliases": ["go", "golang"]
-}

packages/go/1.16.2/run

@@ -1,7 +0,0 @@
-#!/usr/bin/env bash
-
-mv $1 $1.go
-#filename=$1.go
-filename=*.go
-shift
-GOCACHE=$PWD go run $filename "$@"

packages/go/1.16.2/test.go

@@ -1,7 +0,0 @@
-package main
-
-import "fmt"
-
-func main() {
-	fmt.Println("OK")
-}

runtimes/default.nix

@@ -44,4 +44,5 @@ args: {
     "iverilog" = import ./iverilog.nix args;
     "ghc-haskell" = import ./ghc-haskell.nix args;
     "groovy" = import ./groovy.nix args;
+    "go" = import ./go.nix args;
 }

runtimes/go.nix

@@ -0,0 +1,38 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.go;
+in piston.mkRuntime {
+    language = "go";
+    version = pkg.version;
+
+    aliases = [
+        "golang"
+    ];
+
+    run = ''
+        mv $1 $1.go
+        filename=*.go
+        shift
+        GOCACHE=$PWD ${pkg}/bin/go run $filename "$@"
+    '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.go" = ''
+                    package main
+
+                    import "fmt"
+
+                    func main() {
+                        fmt.Println("OK")
+                    }
+                '';
+            };
+            args = [];
+            stdin = "";
+            packages = [];
+            main = "test.go";
+        })
+    ];
+}