Use path.Join instead of + (#143)

Towards windows support.

deno_dir.go

@@ -87,7 +87,7 @@ func LoadOutputCodeCache(filename string, sourceCodeBuf []byte) (
 
 func UserHomeDir() string {
 	if runtime.GOOS == "windows" {
-		home := os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH")
+		home := path.Join(os.Getenv("HOMEDRIVE"), os.Getenv("HOMEPATH"))
 		if home == "" {
 			home = os.Getenv("USERPROFILE")
 		}

main.go

@@ -6,6 +6,7 @@ import (
 	"flag"
 	"fmt"
 	"os"
+	"path"
 	"runtime/pprof"
 
 	"github.com/ry/v8worker2"
@@ -38,8 +39,8 @@ func setPerms() {
 	Perms.Net = *flagAllowNet
 }
 
-func stringAsset(path string) string {
-	data, err := Asset("dist/" + path)
+func stringAsset(filename string) string {
+	data, err := Asset(path.Join("dist", filename))
 	check(err)
 	return string(data)
 }

os.go

@@ -123,7 +123,7 @@ func HandleCodeFetch(moduleSpecifier string, containingFile string) (out []byte)
 		sourceCodeBuf, err = FetchRemoteSource(moduleName, filename)
 	} else if strings.HasPrefix(moduleName, assetPrefix) {
 		f := strings.TrimPrefix(moduleName, assetPrefix)
-		sourceCodeBuf, err = Asset("dist/" + f)
+		sourceCodeBuf, err = Asset(path.Join("dist", f))
 		if err != nil {
 			logDebug("%s Asset doesn't exist. Return without error", moduleName)
 			err = nil