Restructure based on hello reference

pkg/server/debug/option.go

@@ -4,8 +4,20 @@ import (
 	"context"
 
 	"github.com/owncloud/ocis-graph/pkg/config"
+	"github.com/owncloud/ocis-pkg/log"
 )
 
+// Option defines a single option function.
+type Option func(o *Options)
+
+// Options defines the available options for this package.
+type Options struct {
+	Logger  log.Logger
+	Context context.Context
+	Config  *config.Config
+}
+
+// newOptions initializes the available default options.
 func newOptions(opts ...Option) Options {
 	opt := Options{}
 
@@ -16,19 +28,21 @@ func newOptions(opts ...Option) Options {
 	return opt
 }
 
-type Option func(o *Options)
-
-type Options struct {
-	Context context.Context
-	Config  *config.Config
+// Logger provides a function to set the logger option.
+func Logger(val log.Logger) Option {
+	return func(o *Options) {
+		o.Logger = val
+	}
 }
 
+// Context provides a function to set the context option.
 func Context(val context.Context) Option {
 	return func(o *Options) {
 		o.Context = val
 	}
 }
 
+// Config provides a function to set the config option.
 func Config(val *config.Config) Option {
 	return func(o *Options) {
 		o.Config = val