56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
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// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package template_test
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import (
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"log"
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"os"
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"strings"
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"github.com/alecthomas/template"
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)
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// This example demonstrates a custom function to process template text.
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// It installs the strings.Title function and uses it to
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// Make Title Text Look Good In Our Template's Output.
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func ExampleTemplate_func() {
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// First we create a FuncMap with which to register the function.
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funcMap := template.FuncMap{
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// The name "title" is what the function will be called in the template text.
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"title": strings.Title,
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}
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// A simple template definition to test our function.
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// We print the input text several ways:
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// - the original
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// - title-cased
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// - title-cased and then printed with %q
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// - printed with %q and then title-cased.
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const templateText = `
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Input: {{printf "%q" .}}
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Output 0: {{title .}}
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Output 1: {{title . | printf "%q"}}
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Output 2: {{printf "%q" . | title}}
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`
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// Create a template, add the function map, and parse the text.
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tmpl, err := template.New("titleTest").Funcs(funcMap).Parse(templateText)
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if err != nil {
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log.Fatalf("parsing: %s", err)
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}
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// Run the template to verify the output.
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err = tmpl.Execute(os.Stdout, "the go programming language")
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if err != nil {
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log.Fatalf("execution: %s", err)
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}
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// Output:
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// Input: "the go programming language"
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// Output 0: The Go Programming Language
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// Output 1: "The Go Programming Language"
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// Output 2: "The Go Programming Language"
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}
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