example_test.go

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package template_test
     6  
     7  import (
     8  	"log"
     9  	"os"
    10  	"strings"
    11  	"text/template"
    12  )
    13  
    14  func ExampleTemplate() {
    15  	// Define a template.
    16  	const letter = `
    17  Dear {{.Name}},
    18  {{if .Attended}}
    19  It was a pleasure to see you at the wedding.
    20  {{- else}}
    21  It is a shame you couldn't make it to the wedding.
    22  {{- end}}
    23  {{with .Gift -}}
    24  Thank you for the lovely {{.}}.
    25  {{end}}
    26  Best wishes,
    27  Josie
    28  `
    29  
    30  	// Prepare some data to insert into the template.
    31  	type Recipient struct {
    32  		Name, Gift string
    33  		Attended   bool
    34  	}
    35  	var recipients = []Recipient{
    36  		{"Aunt Mildred", "bone china tea set", true},
    37  		{"Uncle John", "moleskin pants", false},
    38  		{"Cousin Rodney", "", false},
    39  	}
    40  
    41  	// Create a new template and parse the letter into it.
    42  	t := template.Must(template.New("letter").Parse(letter))
    43  
    44  	// Execute the template for each recipient.
    45  	for _, r := range recipients {
    46  		err := t.Execute(os.Stdout, r)
    47  		if err != nil {
    48  			log.Println("executing template:", err)
    49  		}
    50  	}
    51  
    52  	// Output:
    53  	// Dear Aunt Mildred,
    54  	//
    55  	// It was a pleasure to see you at the wedding.
    56  	// Thank you for the lovely bone china tea set.
    57  	//
    58  	// Best wishes,
    59  	// Josie
    60  	//
    61  	// Dear Uncle John,
    62  	//
    63  	// It is a shame you couldn't make it to the wedding.
    64  	// Thank you for the lovely moleskin pants.
    65  	//
    66  	// Best wishes,
    67  	// Josie
    68  	//
    69  	// Dear Cousin Rodney,
    70  	//
    71  	// It is a shame you couldn't make it to the wedding.
    72  	//
    73  	// Best wishes,
    74  	// Josie
    75  }
    76  
    77  // The following example is duplicated in html/template; keep them in sync.
    78  
    79  func ExampleTemplate_block() {
    80  	const (
    81  		master  = `Names:{{block "list" .}}{{"\n"}}{{range .}}{{println "-" .}}{{end}}{{end}}`
    82  		overlay = `{{define "list"}} {{join . ", "}}{{end}} `
    83  	)
    84  	var (
    85  		funcs     = template.FuncMap{"join": strings.Join}
    86  		guardians = []string{"Gamora", "Groot", "Nebula", "Rocket", "Star-Lord"}
    87  	)
    88  	masterTmpl, err := template.New("master").Funcs(funcs).Parse(master)
    89  	if err != nil {
    90  		log.Fatal(err)
    91  	}
    92  	overlayTmpl, err := template.Must(masterTmpl.Clone()).Parse(overlay)
    93  	if err != nil {
    94  		log.Fatal(err)
    95  	}
    96  	if err := masterTmpl.Execute(os.Stdout, guardians); err != nil {
    97  		log.Fatal(err)
    98  	}
    99  	if err := overlayTmpl.Execute(os.Stdout, guardians); err != nil {
   100  		log.Fatal(err)
   101  	}
   102  	// Output:
   103  	// Names:
   104  	// - Gamora
   105  	// - Groot
   106  	// - Nebula
   107  	// - Rocket
   108  	// - Star-Lord
   109  	// Names: Gamora, Groot, Nebula, Rocket, Star-Lord
   110  }
   111
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