Break utils package into subpackages.

internal/utils/filesys/filesys.go

@@ -0,0 +1,85 @@
+package filesys
+
+import (
+	"fmt"
+	"go/format"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// FormatAndSaveGoFile saves go file at folder dir, with name fileName and contents text.
+func FormatAndSaveGoFile(dirPath, fileName string, text []byte) error {
+	newGoFilePath := filepath.Join(dirPath, fileName)
+
+	if !strings.HasSuffix(newGoFilePath, ".go") {
+		newGoFilePath += ".go"
+	}
+
+	file, err := os.Create(newGoFilePath)
+
+	if err != nil {
+		return err
+	}
+
+	defer file.Close()
+
+	p, err := format.Source(text)
+
+	// if there is a format error we will write unformulated text for debug purposes
+	if err != nil {
+		file.Write(text)
+		return fmt.Errorf("failed to format '%s', check '%s' for syntax errors: %w", fileName, newGoFilePath, err)
+	}
+
+	_, err = file.Write(p)
+	if err != nil {
+		return fmt.Errorf("failed to save '%s' file: %w", newGoFilePath, err)
+	}
+
+	return nil
+}
+
+// EnsureDirPathExist ensures dir path exists. If path does not exist, creates new path.
+func EnsureDirPathExist(dirPath string) error {
+	if _, err := os.Stat(dirPath); os.IsNotExist(err) {
+		err := os.MkdirAll(dirPath, os.ModePerm)
+
+		if err != nil {
+			return fmt.Errorf("can't create directory - %s: %w", dirPath, err)
+		}
+	}
+
+	return nil
+}
+
+// RemoveDir deletes everything at folder dir.
+func RemoveDir(dir string) error {
+	exist, err := DirExists(dir)
+
+	if err != nil {
+		return err
+	}
+
+	if exist {
+		err := os.RemoveAll(dir)
+
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// DirExists checks if folder at path exist.
+func DirExists(path string) (bool, error) {
+	_, err := os.Stat(path)
+	if err == nil {
+		return true, nil
+	}
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	return true, err
+}