patch multiple -Z options

pkg/obitax/default_taxonomy.go

@@ -1,11 +1,14 @@
 package obitax
 
 import (
+	"sync"
+
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obidefault"
 	log "github.com/sirupsen/logrus"
 )
 
 var __defaut_taxonomy__ *Taxonomy
+var __defaut_taxonomy_mutex__ sync.Mutex
 
 func (taxonomy *Taxonomy) SetAsDefault() {
 	log.Infof("Set as default taxonomy %s", taxonomy.Name())
@@ -32,14 +35,18 @@ func DefaultTaxonomy() *Taxonomy {
 	var err error
 	if __defaut_taxonomy__ == nil {
 		if obidefault.HasSelectedTaxonomy() {
-			__defaut_taxonomy__, err = LoadTaxonomy(
-				obidefault.SelectedTaxonomy(),
-				!obidefault.AreAlternativeNamesSelected(),
-			)
+			__defaut_taxonomy_mutex__.Lock()
+			defer __defaut_taxonomy_mutex__.Unlock()
+			if __defaut_taxonomy__ == nil {
+				__defaut_taxonomy__, err = LoadTaxonomy(
+					obidefault.SelectedTaxonomy(),
+					!obidefault.AreAlternativeNamesSelected(),
+				)
 
-			if err != nil {
-				log.Fatalf("Cannot load default taxonomy: %v", err)
+				if err != nil {
+					log.Fatalf("Cannot load default taxonomy: %v", err)
 
+				}
 			}
 		}
 	}

pkg/obitax/taxonset.go

@@ -196,3 +196,29 @@ func (set *TaxonSet) Contains(id *string) bool {
 	node := set.Get(id)
 	return node != nil
 }
+
+func (set *TaxonSet) Sort() *TaxonSlice {
+	if set == nil {
+		return nil
+	}
+
+	taxonomy := set.Taxonomy()
+	taxa := taxonomy.NewTaxonSlice(0, set.Len())
+	parent := make(map[*TaxNode]bool, set.Len())
+
+	pushed := true
+
+	for pushed {
+		pushed = false
+		for _, node := range set.set {
+			if !parent[node] && (parent[set.Get(node.parent).Node] ||
+				!set.Contains(node.parent)) {
+				pushed = true
+				taxa.slice = append(taxa.slice, node)
+				parent[node] = true
+			}
+		}
+	}
+
+	return taxa
+}