unrolled/render 集成Masterminds/sprig 增强模版处理

Posted 2020-12-19 rongfengliang

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Masterminds/sprig 是一个强大的golang 模版函数，以下是一个unrolled/render 集成Masterminds/sprig 的简单demo

环境准备

go.mod

module github.com/rongfengliang/renameio-app

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go 1.14

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require (

    github.com/Masterminds/goutils v1.1.0 // indirect

    github.com/Masterminds/semver v1.5.0 // indirect

    github.com/Masterminds/sprig v2.22.0+incompatible

    github.com/google/renameio v0.1.0

    github.com/google/uuid v1.1.1 // indirect

    github.com/huandu/xstrings v1.3.2 // indirect

    github.com/imdario/mergo v0.3.10 // indirect

    github.com/mitchellh/copystructure v1.0.0 // indirect

    github.com/stretchr/testify v1.6.1 // indirect

    github.com/unrolled/render v1.0.3

    golang.org/x/crypto v0.0.0-20200728195943-123391ffb6de // indirect

)

项目结构

├── demo.conf

├── go.mod

├── go.sum

├── main.go

└── templates

    ├── admin

    ├── home

    ├── index.tmpl

    └── layout.tmpl

golang 代码集成

main.go

package main

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import (

    "encoding/xml"

    "errors"

    "html/template"

    "net/http"

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    "github.com/Masterminds/sprig"

    "github.com/google/renameio"

    "github.com/unrolled/render"

)

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// fielname for test

func filname() error {

    confContent := `

    nginx {

        main {

            server {

                port :9090;

            }

        }

    }

    `

    err := renameio.WriteFile("./demo.conf", []byte(confContent), 0644)

    if err != nil {

        return errors.New("some wrong:" + err.Error())

    }

    return nil

}

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// render demo

func main() {

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    r := render.New(render.Options{

        Layout:        "layout",

        IsDevelopment: true,

        Funcs: []template.FuncMap{

            sprig.FuncMap(),

        },

    })

    mux := http.NewServeMux()

    mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {

        w.Write([]byte("Welcome, visit sub pages now."))

    })

    ob := struct {

        XMLName xml.Name `json:"-" xml:"dalongdemoapp"`

        Name    string   `json:"dalongrong" xml:"dalongdemo"`

        Items   []string `json:"items" xml:"items"`

    }{

        Name:  "dalong",

        Items: []string{"demo", "app"},

    }

    mux.HandleFunc("/json", func(w http.ResponseWriter, req *http.Request) {

        r.JSON(w, 200, ob)

    })

    mux.HandleFunc("/xml", func(w http.ResponseWriter, req *http.Request) {

        r.XML(w, 200, ob)

    })

    mux.HandleFunc("/rename", func(w http.ResponseWriter, req *http.Request) {

        if err := filname(); err != nil {

            r.JSON(w, 500, "rename wrong")

            return

        }

        r.JSON(w, 200, "rename ok")

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    })

    mux.HandleFunc("/html", func(w http.ResponseWriter, req *http.Request) {

        r.HTML(w, 200, "index", ob)

    })

    http.ListenAndServe("127.0.0.1:3000", mux)

}

index.tmpl

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <title>Document</title>

</head>

<body>

    {{.Name}}

    {{ range .Items }}

            <p>{{ . }}</p>

    {{ end }}

    {{ "hello!" | repeat 5 }}

    {{ range $i,$v := .Items }}

           <p>{{ $i }} {{$v}}</p>

    {{ end }}

</body>

</html>

layout.tmpl

<!-- templates/layout.tmpl -->

<html>

  <head>

    <title>My Layout</title>

    <!-- Render the partial template called `css-$current_template` here -->

    {{ partial "css" }}

  </head>

  <body>

    <!-- render the partial template called `header-$current_template` here -->

    {{ partial "header" }}

    <!-- Render the current template here -->

    {{ yield }}

    This is the {{ current }} page.

    <!-- render the partial template called `footer-$current_template` here -->

    {{ partial "footer" }}

  </body>

</html>