refactored dir layout

cmd/util.go

@@ -0,0 +1,79 @@
+/*
+Copyright © 2023 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 cmd
+
+import (
+	"fmt"
+	"math"
+	"strings"
+)
+
+// find an item in a list, generic variant
+func contains[E comparable](s []E, v E) bool {
+	for _, vs := range s {
+		if v == vs {
+			return true
+		}
+	}
+
+	return false
+}
+
+// look if a key in a map exists, generic variant
+func exists[K comparable, V any](m map[K]V, v K) bool {
+	if _, ok := m[v]; ok {
+		return true
+	}
+
+	return false
+}
+
+func const2num(name string) float64 {
+	switch name {
+	case "Pi":
+		return math.Pi
+	case "Phi":
+		return math.Phi
+	case "Sqrt2":
+		return math.Sqrt2
+	case "SqrtE":
+		return math.SqrtE
+	case "SqrtPi":
+		return math.SqrtPi
+	case "SqrtPhi":
+		return math.SqrtPhi
+	case "Ln2":
+		return math.Ln2
+	case "Log2E":
+		return math.Log2E
+	case "Ln10":
+		return math.Ln10
+	case "Log10E":
+		return math.Log10E
+	default:
+		return 0
+	}
+}
+
+func list2str(list Numbers) string {
+	return strings.Trim(strings.Join(strings.Fields(fmt.Sprint(list)), " "), "[]")
+}
+
+func Error(m string) error {
+	return fmt.Errorf("Error: %s", m)
+}