refactor Import()

app/io.go

@@ -0,0 +1,36 @@
+/*
+Copyright © 2024 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+package app
+
+import "os"
+
+func cleanError(file string, err error) error {
+	// remove given [backup] file and forward the given error
+	os.Remove(file)
+	return err
+}
+
+func fileExists(filename string) bool {
+	info, err := os.Stat(filename)
+
+	if err != nil {
+		// return false on any error
+		return false
+	}
+
+	return !info.IsDir()
+}