reorganized directory and package structure

lib/helpers.go

@@ -0,0 +1,51 @@
+/*
+Copyright © 2022 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 lib
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func die(v ...interface{}) {
+	fmt.Fprintln(os.Stderr, v...)
+	os.Exit(1)
+}
+
+func contains(s []int, e int) bool {
+	for _, a := range s {
+		if a == e {
+			return true
+		}
+	}
+	return false
+}
+
+func prepareColumns() {
+	if len(Columns) > 0 {
+		for _, use := range strings.Split(Columns, ",") {
+			usenum, err := strconv.Atoi(use)
+			if err != nil {
+				die(err)
+			}
+			UseColumns = append(UseColumns, usenum)
+		}
+	}
+}