traverse: added golang

pkg/traverse/golang.go

@@ -0,0 +1,23 @@
+package traverse
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// GoBinDir TODO experimental
+func GoBinDir(tc Context) (dir string, err error) {
+	if path, ok := tc.LookupEnv("GOPATH"); ok {
+		dir = strings.Split(path, string(os.PathListSeparator))[0]
+	}
+
+	if dir == "" {
+		if dir, err = UserHomeDir(tc); err != nil {
+			return "", err
+		}
+		dir += "/go"
+	}
+
+	return filepath.ToSlash(dir) + "/bin", nil
+}