read and write index file

1 files changed, 41 insertions, 0 deletions

diff --git a/util.go b/util.go
new file mode 100644
index 0000000..09f93be
--- /dev/null
+++ b/util.go
@@ -0,0 +1,41 @@
+/*******************************************************************************
+*
+* Copyright 2017 Stefan Majewsky <majewsky@gmx.net>
+*
+* 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 main
+
+import (
+	"fmt"
+	"os"
+)
+
+//ShowError prints the given error on stderr if it is non-nil, or returns false otherwise.
+func ShowError(err error) bool {
+	if err == nil {
+		return false
+	}
+	fmt.Fprintf(os.Stderr, "ERROR: %s\n", err.Error())
+	return true
+}
+
+//FatalIfError prints the given error on stderr and exits with an error code.
+func FatalIfError(err error) {
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "FATAL: %s\n", err.Error())
+		os.Exit(255)
+	}
+}