dll fix for c#

Author: danielborowski

language/csharp/csharp.go

@@ -4,17 +4,29 @@ import (
 	"github.com/coderbyte-org/cb-code-runner/cmd"
 	"github.com/coderbyte-org/cb-code-runner/util"
 	"path/filepath"
+	"io"
+	"os"
+	"fmt"
 )
 
 func Run(files []string, stdin string) (string, string, error, string) {
 	workDir := filepath.Dir(files[0])
 	binName := "a.exe"
+	sourceFiles := util.FilterByExtension(files, "cs")
 
-	// TODO: getting JSON package to work with C#
+	// for C#, need to link .dll files to this project and include them in directory
 	// https://stackoverflow.com/questions/50079804/how-do-i-add-json-assembly-to-compile-c-sharp-code-on-ubuntu-terminal-using-mcs
 	// https://stackoverflow.com/questions/49767212/how-to-compile-and-run-c-sharp-project-from-terminal-mac-os
-	sourceFiles := util.FilterByExtension(files, "cs")
-	args := append([]string{"mcs", "-out:" + binName}, sourceFiles...)
+	// https://docs.unity3d.com/462/Documentation/Manual/UsingDLL.html
+	oldLocation := "/usr/local/bin/Newtonsoft.Json.dll"
+	newLocation := workDir + "/Newtonsoft.Json.dll"
+	srcFile, err := os.Open(oldLocation)
+	destFile, err := os.Create(newLocation)
+	_, err = io.Copy(destFile, srcFile)
+	err = destFile.Sync()
+	
+	args := append([]string{"mcs", "-r:Newtonsoft.Json.dll", "-out:" + binName}, sourceFiles...)
+
 	stdout, stderr, err, duration := cmd.Run(workDir, args...)
 	if err != nil || stderr != "" {
 		return stdout, stderr, err, duration