Push suffix/prefix code to plugin.

plugin/someteam.example.com/v1/dateprefixer/DatePrefixer.go

@@ -4,18 +4,51 @@
 package main
 
 import (
+	"github.com/pkg/errors"
 	"sigs.k8s.io/kustomize/pkg/ifc"
 	"sigs.k8s.io/kustomize/pkg/resmap"
 	"sigs.k8s.io/kustomize/pkg/transformers"
 	"sigs.k8s.io/kustomize/pkg/transformers/config"
+	"sigs.k8s.io/kustomize/plugin/builtin"
+	"sigs.k8s.io/yaml"
 )
 
-type plugin struct{}
+// Add a date prefix to the name.
+// A plugin that adapts another plugin.
+type plugin struct {
+	t transformers.Transformer
+}
 
 var KustomizePlugin plugin
 
+func (p *plugin) makePrefixSuffixPluginConfig() ([]byte, error) {
+	var s struct {
+		Prefix     string
+		Suffix     string
+		FieldSpecs []config.FieldSpec
+	}
+	s.Prefix = getDate() + "-"
+	s.FieldSpecs = []config.FieldSpec{
+		{Path: "metadata/name"},
+	}
+	return yaml.Marshal(s)
+}
+
 func (p *plugin) Config(
 	ldr ifc.Loader, rf *resmap.Factory, c []byte) error {
+	// Ignore the incoming c, compute new config.
+	c, err := p.makePrefixSuffixPluginConfig()
+	if err != nil {
+		return errors.Wrapf(
+			err, "dateprefixer makeconfig")
+	}
+	prefixer := builtin.NewPrefixSuffixTransformerPlugin()
+	err = prefixer.Config(ldr, rf, c)
+	if err != nil {
+		return errors.Wrapf(
+			err, "prefixsuffix configure")
+	}
+	p.t = prefixer
 	return nil
 }
 
@@ -28,11 +61,5 @@ func getDate() string {
 }
 
 func (p *plugin) Transform(m resmap.ResMap) error {
-	tr, err := transformers.NewPrefixSuffixTransformer(
-		getDate()+"-", "",
-		config.MakeDefaultConfig().NamePrefix)
-	if err != nil {
-		return err
-	}
-	return tr.Transform(m)
+	return p.t.Transform(m)
 }