feat: support custom marshal and content type

README.md

@@ -2,7 +2,7 @@
 
 [![Build Status](https://img.shields.io/travis/vicanso/elton-responder.svg?label=linux+build)](https://travis-ci.org/vicanso/elton-responder)
 
-Responder middleware for elton, it can convert `Context.Body` to json data. By this middleware, it's more simple for successful response.
+Responder middleware for elton, it can convert `Context.Body` to json data. By this middleware, it's more simple for successful response. More response type can be supported through custom marshal function and content type.
 
 
 ```go

example/main.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"time"
+
+	"github.com/vicanso/elton"
+	responder "github.com/vicanso/elton-responder"
+)
+
+type AutoGenerated struct {
+	Users []struct {
+		ID             int    `json:"id"`
+		Username       string `json:"username"`
+		AvatarTemplate string `json:"avatar_template"`
+	} `json:"users"`
+	Topics struct {
+		CanCreateTopic bool        `json:"can_create_topic"`
+		MoreTopicsURL  string      `json:"more_topics_url"`
+		Draft          interface{} `json:"draft"`
+		DraftKey       string      `json:"draft_key"`
+		DraftSequence  interface{} `json:"draft_sequence"`
+		PerPage        int         `json:"per_page"`
+		Topics         []struct {
+			ID                 int         `json:"id"`
+			Title              string      `json:"title"`
+			FancyTitle         string      `json:"fancy_title"`
+			Slug               string      `json:"slug"`
+			PostsCount         int         `json:"posts_count"`
+			ReplyCount         int         `json:"reply_count"`
+			HighestPostNumber  int         `json:"highest_post_number"`
+			ImageURL           string      `json:"image_url"`
+			CreatedAt          time.Time   `json:"created_at"`
+			LastPostedAt       time.Time   `json:"last_posted_at"`
+			Bumped             bool        `json:"bumped"`
+			BumpedAt           time.Time   `json:"bumped_at"`
+			Unseen             bool        `json:"unseen"`
+			Pinned             bool        `json:"pinned"`
+			Unpinned           interface{} `json:"unpinned"`
+			Excerpt            string      `json:"excerpt,omitempty"`
+			Visible            bool        `json:"visible"`
+			Closed             bool        `json:"closed"`
+			Archived           bool        `json:"archived"`
+			Bookmarked         interface{} `json:"bookmarked"`
+			Liked              interface{} `json:"liked"`
+			Views              int         `json:"views"`
+			LikeCount          int         `json:"like_count"`
+			HasSummary         bool        `json:"has_summary"`
+			Archetype          string      `json:"archetype"`
+			LastPosterUsername string      `json:"last_poster_username"`
+			CategoryID         int         `json:"category_id"`
+			PinnedGlobally     bool        `json:"pinned_globally"`
+			Posters            []struct {
+				Extras      string `json:"extras"`
+				Description string `json:"description"`
+				UserID      int    `json:"user_id"`
+			} `json:"posters"`
+		} `json:"topics"`
+	} `json:"topics"`
+}
+
+func main() {
+	d := elton.New()
+
+	buf, _ := ioutil.ReadFile("./test.json")
+	genInfo := &AutoGenerated{}
+	marshal := func(v interface{}) ([]byte, error) {
+		return json.Marshal(v)
+	}
+	json.Unmarshal(buf, genInfo)
+
+	d.Use(responder.New(responder.Config{
+		Marshal: marshal,
+	}))
+	d.GET("/", func(c *elton.Context) (err error) {
+		c.Body = genInfo
+		return
+	})
+
+	d.ListenAndServe(":3000")
+}