day 16 part 1

utils/files/files.go

@@ -0,0 +1,27 @@
+package files
+
+import (
+	"errors"
+	"fmt"
+	"os"
+)
+
+func CreateOrReplace(fileName string) (*os.File, error) {
+	var output *os.File
+	if _, err := os.Stat(fileName); errors.Is(err, os.ErrNotExist) {
+		output, err = os.Create(fileName)
+		if err != nil {
+			return nil, fmt.Errorf("Error creating file %s", fileName)
+		}
+	} else {
+		err = os.Truncate(fileName, 0)
+		if err != nil {
+			return nil, fmt.Errorf("Error truncating file %s", fileName)
+		}
+		output, err = os.Open(fileName)
+		if err != nil {
+			return nil, fmt.Errorf("Error opening file %s", fileName)
+		}
+	}
+	return output, nil
+}