fix #2: add flag --create-config to create a default config

cmd/store.go

@@ -102,9 +102,37 @@ func Mkdir(dir string) error {
 	return nil
 }
 
-// FIXME: check https://github.com/gosimple/slug
 func Slug(input string) string {
 	slug := slugify.ReplaceAllString(input, "-")
 	slug = suffix.ReplaceAllString(slug, "")
 	return nonprintable.ReplaceAllString(slug, "")
 }
+
+func FileExists(filename string) bool {
+	info, err := os.Stat(filename)
+
+	if err != nil {
+		// return false on any error
+		return false
+	}
+
+	return !info.IsDir()
+}
+
+func WriteFile(filename string, content []byte) error {
+	var err error
+
+	fd, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
+	if err != nil {
+		return fmt.Errorf("failed to open file %s for writing: %w", filename, err)
+	}
+	defer func() {
+		if err := fd.Close(); err != nil {
+			log.Fatal(err)
+		}
+	}()
+
+	_, err = fd.Write(content)
+
+	return err
+}