[feat] 新增配置项

engine/engine_option.go

@@ -0,0 +1,30 @@
+package engine
+
+type engineOptions struct {
+	debug     bool
+	relations []string
+}
+
+type EngineOption interface {
+	apply(*engineOptions)
+}
+
+type fnOption struct {
+	f func(*engineOptions)
+}
+
+func (this fnOption) apply(do *engineOptions) {
+	this.f(do)
+}
+
+func Debug() EngineOption {
+	return &fnOption{f: func(o *engineOptions) {
+		o.debug = true
+	}}
+}
+
+func Relation(opts ...string) EngineOption {
+	return &fnOption{f: func(o *engineOptions) {
+		o.relations = append(o.relations, opts...)
+	}}
+}