初始化目录结构

.bookignore

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+# only for gitbook

.editorconfig

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+# Copyright 2017 <chaishushan{AT}gmail.com>. All rights reserved.
+# Use of this source code is governed by a Apache
+# license that can be found in the LICENSE file.
+
+# http://editorconfig.org/
+
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+charset = utf-8
+end_of_line = lf
+trim_trailing_whitespace = true
+insert_final_newline = false
+
+[*]
+indent_style = tab
+
+[*.{go,proto}]
+charset = utf-8
+indent_style = tab
+
+# Matches the exact files either package.json or .travis.yml
+[{package.json,.travis.yml}]
+indent_style = space
+indent_size = 2
+
+[*.yaml]
+indent_style = space
+indent_size = 2

.gitignore

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+# Node rules:
+## Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+## Dependency directory
+## Commenting this out is preferred by some people, see
+## https://docs.npmjs.com/misc/faq#should-i-check-my-node_modules-folder-into-git
+node_modules
+
+# Book build output
+_book
+
+# eBook build output
+*.epub
+*.mobi
+*.pdf
+
+*.o
+*.obj
+*.exe
+
+# macOS
+.DS_Store
+
+*.a
+*.lib
+*.so
+*.dll
+*.obj
+*.o
+a.out
+
+.oracle_jre_usage
+
+# Delve
+debug

Makefile

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+# Copyright 2016 <chaishushan{AT}gmail.com>. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+#
+# fix gitbook build error on macOS(node@8.x and gitbook@2.6.7)
+#
+# gitbook fetch 3.2.3
+# gitbook build --gitbook=3.2.3
+#
+# https://github.com/GitbookIO/gitbook/issues/1774
+# https://github.com/GitbookIO/gitbook-cli/blob/master/README.md
+#
+
+default:
+	gitbook build
+
+macos:
+	gitbook build --gitbook=3.2.3
+
+macos-pdf:
+	mv preface.md preface-bak.md && mv preface-pdf.md preface.md
+	gitbook pdf --gitbook=3.2.3
+	mv preface.md preface-pdf.md && mv preface-bak.md preface.md
+
+server:
+	go run server.go
+
+cover:
+	convert -resize 1800x2360! cover.png cover.jpg
+	convert -resize 200x262!   cover.png cover_small.jpg
+
+
+# https://chai2010.cn/go2-book
+deploy:
+	-rm -rf _book
+	gitbook build
+
+	cd _book && \
+		git init && \
+		git add . && \
+		git commit -m "Update github pages" && \
+		git push --force --quiet "https://github.com/chai2010/go2-book.git" master:gh-pages
+
+	@echo deploy done
+
+clean:
+	-rm -rf _book

README.md

@@ -1,2 +1,17 @@
-# go2-book
-Go2编程指南
+# Go2编程指南
+
+本书重点讲解Go2新特性，以及Go1教程中较少涉及的特性。本书适合对Go语言有一定基础的用户学习。
+
+![](cover.png)
+
+- 作者：柴树杉，Github [@chai2010](https://github.com/chai2010)，Twitter [@chaishushan](https://twitter.com/chaishushan)
+
+
+## 在线阅读
+
+- [SUMMARY.md](SUMMARY.md)
+
+## 版权声明
+
+自有版权，严禁任何使用。
+

SUMMARY.md

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+# 目录
+
+* [第1章 语法糖变迁](ch1/readme.md)

book.json

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+{
+	"gitbook": "3.x",
+	"title": "Go2编程指南",
+	"description": "Go2编程指南",
+	"language": "zh-hans",
+
+	"structure": {
+		"readme": "preface.md"
+	},
+
+	"pluginsConfig": {
+		"theme-default": {
+			"showLevel": false
+		}
+	},
+
+	"plugins": [
+		"-search"
+	]
+}

go.mod

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+// Copyright 2018 <chaishushan{AT}gmail.com>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+module github.com/chai2010/go2-book

preface.md

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+# Go2编程指南
+
+本书重点讲解Go2新特性，以及Go1教程中较少涉及的特性。本书适合对Go语言有一定基础的用户学习。
+
+![](cover.png)
+
+- 作者：柴树杉，Github [@chai2010](https://github.com/chai2010)，Twitter [@chaishushan](https://twitter.com/chaishushan)
+
+
+## 版权声明
+
+自有版权，严禁任何使用。
+
+-----
+
+# 前言
+
+TODO

server.go

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+// Copyright 2016 <chaishushan{AT}gmail.com>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build ignore
+
+package main
+
+import (
+	"flag"
+	"log"
+	"net"
+	"net/http"
+	"os/exec"
+	"runtime"
+	"time"
+)
+
+var (
+	flagRootDir     = flag.String("dir", ".", "root dir")
+	flagHttpAddr    = flag.String("http", ":8080", "HTTP service address")
+	flagNoCache     = flag.Bool("no-cache", true, "disable browser cache")
+	flagOpenBrowser = flag.Bool("openbrowser", true, "open browser automatically")
+)
+
+func main() {
+	flag.Parse()
+
+	host, port, err := net.SplitHostPort(*flagHttpAddr)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	if host == "" {
+		host = getLocalIP()
+	}
+	httpAddr := host + ":" + port
+	url := "http://" + httpAddr + "/_book"
+
+	go func() {
+		log.Printf("dir: %s\n", *flagRootDir)
+
+		if waitServer(url) && *flagOpenBrowser && startBrowser(url) {
+			log.Printf("A browser window should open. If not, please visit %s", url)
+		} else {
+			log.Printf("Please open your web browser and visit %s", url)
+		}
+		log.Printf("Hit CTRL-C to stop the server\n")
+	}()
+
+	mainHandler := http.FileServer(http.Dir(*flagRootDir))
+	if *flagNoCache {
+		mainHandler = NoCache(mainHandler)
+	}
+	log.Fatal(http.ListenAndServe(httpAddr, mainHandler))
+}
+
+// waitServer waits some time for the http Server to start
+// serving url. The return value reports whether it starts.
+func waitServer(url string) bool {
+	tries := 20
+	for tries > 0 {
+		resp, err := http.Get(url)
+		if err == nil {
+			resp.Body.Close()
+			return true
+		}
+		time.Sleep(100 * time.Millisecond)
+		tries--
+	}
+	return false
+}
+
+func getLocalIP() string {
+	addrs, err := net.InterfaceAddrs()
+	if err != nil {
+		return "127.0.0.1"
+	}
+	for _, address := range addrs {
+		if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
+			if ipnet.IP.To4() != nil {
+				return ipnet.IP.String()
+			}
+		}
+	}
+	return "127.0.0.1"
+}
+
+// startBrowser tries to open the URL in a browser, and returns
+// whether it succeed.
+func startBrowser(url string) bool {
+	// try to start the browser
+	var args []string
+	switch runtime.GOOS {
+	case "darwin":
+		args = []string{"open"}
+	case "windows":
+		args = []string{"cmd", "/c", "start"}
+	default:
+		args = []string{"xdg-open"}
+	}
+	cmd := exec.Command(args[0], append(args[1:], url)...)
+	return cmd.Start() == nil
+}
+
+var epoch = time.Unix(0, 0).Format(time.RFC1123)
+
+var noCacheHeaders = map[string]string{
+	"Expires":         epoch,
+	"Cache-Control":   "no-cache, private, max-age=0",
+	"Pragma":          "no-cache",
+	"X-Accel-Expires": "0",
+}
+
+var etagHeaders = []string{
+	"ETag",
+	"If-Modified-Since",
+	"If-Match",
+	"If-None-Match",
+	"If-Range",
+	"If-Unmodified-Since",
+}
+
+func NoCache(h http.Handler) http.Handler {
+	fn := func(w http.ResponseWriter, r *http.Request) {
+		// Delete any ETag headers that may have been set
+		for _, v := range etagHeaders {
+			if r.Header.Get(v) != "" {
+				r.Header.Del(v)
+			}
+		}
+
+		// Set our NoCache headers
+		for k, v := range noCacheHeaders {
+			w.Header().Set(k, v)
+		}
+
+		h.ServeHTTP(w, r)
+	}
+
+	return http.HandlerFunc(fn)
+}