pkg/generator: add code generation for config/config.yaml

pkg/generator/gen_config.go

@@ -0,0 +1,31 @@
+package generator
+
+import (
+	"io"
+
+	yaml "gopkg.in/yaml.v2"
+)
+
+type Config struct {
+	// APIVersion is the kubernetes apiVersion that has the format of $GROUP_NAME/$VERSION.
+	APIVersion string `yaml:"apiVersion"`
+	// Kind is the kubernetes resource kind.
+	Kind string `yaml:"kind"`
+	// ProjectName is name of the new operator application
+	// and is also the name of the base directory.
+	ProjectName string `yaml:"projectName"`
+}
+
+func renderConfigFile(w io.Writer, apiVersion, kind, projectName string) error {
+	o, err := yaml.Marshal(&Config{
+		APIVersion:  apiVersion,
+		Kind:        kind,
+		ProjectName: projectName,
+	})
+	if err != nil {
+		return err
+	}
+
+	_, err = w.Write(o)
+	return err
+}

pkg/generator/generator.go

@@ -36,6 +36,7 @@ const (
 	updateGenerated = "update-generated.sh"
 	gopkgtoml       = "Gopkg.toml"
 	gopkglock       = "Gopkg.lock"
+	config          = "config.yaml"
 )
 
 type Generator struct {
@@ -125,11 +126,19 @@ func renderCmdFiles(cmdProjectDir, repoPath string) error {
 }
 
 func (g *Generator) renderConfig() error {
-	if err := os.MkdirAll(filepath.Join(g.projectName, configDir), defaultDirFileMode); err != nil {
+	cp := filepath.Join(g.projectName, configDir)
+	if err := os.MkdirAll(cp, defaultDirFileMode); err != nil {
 		return err
 	}
-	// TODO render files.
-	return nil
+	return renderConfigFiles(cp, g.apiVersion, g.kind, g.projectName)
+}
+
+func renderConfigFiles(configDir, apiVersion, kind, projectName string) error {
+	buf := &bytes.Buffer{}
+	if err := renderConfigFile(buf, apiVersion, kind, projectName); err != nil {
+		return err
+	}
+	return ioutil.WriteFile(filepath.Join(configDir, config), buf.Bytes(), defaultFileMode)
 }
 
 func (g *Generator) renderDeploy() error {

pkg/generator/generator_test.go

@@ -274,3 +274,18 @@ func TestGenGopkg(t *testing.T) {
 		t.Errorf("want %v, got %v", gopkgLockTmpl, buf.String())
 	}
 }
+
+const configExp = `apiVersion: app.example.com/v1alpha1
+kind: AppService
+projectName: app-operator
+`
+
+func TestGenConfig(t *testing.T) {
+	buf := &bytes.Buffer{}
+	if err := renderConfigFile(buf, "app.example.com/v1alpha1", "AppService", "app-operator"); err != nil {
+		t.Error(err)
+	}
+	if configExp != buf.String() {
+		t.Errorf("want %v, got %v", configExp, buf.String())
+	}
+}