Add initial project files

pkg/file/utils.go

@@ -0,0 +1,45 @@
+package file
+
+// This package makes it easier to implement tests to load data from a files.
+//
+// NOTE: Although it was not explicitly mentioned in the task,
+// I decided to make the GetModRootPath() function return path and an error if `go.mod` was not found.
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"runtime"
+)
+
+// GetModRootPath get the root path of the module
+func GetModRootPath() (string, error) {
+	// Get caller filePath
+	_, path, _, _ := runtime.Caller(0)
+	// Get base directory by file info
+	var prevPath string
+	for {
+		path = filepath.Dir(path)
+
+		if IsExist(path + "/go.mod") {
+			return path, nil
+		}
+		// Break if we reach root directory: '/'
+		// Break if prevPath is same, maybe on Windows, something like C:// or c:\\
+		if prevPath == path || len(path) < 2 {
+			break
+		}
+
+		prevPath = path
+	}
+	return "", errors.New("go.mod not found")
+}
+
+// IsExist the path and isn't directory
+func IsExist(path string) bool {
+	info, err := os.Stat(path)
+	if os.IsNotExist(err) {
+		return false
+	}
+	return !info.IsDir()
+}