cluster: sort regions, for jpictl dump' sake

Signed-off-by: Alejandro Mery <amery@jpi.io>

pkg/cluster/regions_utils.go

@@ -8,22 +8,34 @@ import "sort"
 func SortRegions(regions []string) []string {
 	sort.Slice(regions, func(i, j int) bool {
 		r1, r2 := regions[i], regions[j]
+		return regionLess(r1, r2)
+	})
 
+	return regions
+}
+
+func regionLess(r1, r2 string) bool {
+	switch {
+	case len(r1) < 4:
 		switch {
-		case len(r1) < 4:
-			switch {
-			case len(r1) < len(r2):
-				return true
-			case len(r1) > len(r2):
-				return false
-			default:
-				return r1 < r2
-			}
-		case len(r2) < 4:
+		case len(r1) < len(r2):
+			return true
+		case len(r1) > len(r2):
 			return false
 		default:
 			return r1 < r2
 		}
-	})
-	return regions
+	case len(r2) < 4:
+		return false
+	default:
+		return r1 < r2
+	}
+}
+
+func (m *Cluster) sortRegions() {
+	sort.Slice(m.Regions, func(i, j int) bool {
+		r1 := m.Regions[i].Name
+		r2 := m.Regions[j].Name
+		return regionLess(r1, r2)
+	})
 }