Template package

First example

• It outputs the result to Stdout
• Insert variables into a template

Use Go playground

{% raw %}

	type TemplateVariables struct {
		Name string
	}
	tmpl := template.Must(template.New("template").Parse(`{{ .Name }}`))
	err := tmpl.Execute(os.Stdout, TemplateVariables{
		Name: "name inserted",
	})
	if err != nil {
		return err
	}
	return nil

{% endraw %}

Define a custom function

Use template.FuncMap and template.Template.Func to define a Custom Func. In order to use the function in a template, just use that function

• Go Playground

{% raw %}

	type TemplateVariables struct {
		Name string
	}

	tmpl := template.Must(template.New("template").Funcs(template.FuncMap{
		"CustomFunc": func(arg string) string {
			return "return " + arg
		},
	}).Parse(`{{ .Name }}
{{ CustomFunc "argument" }}`))
	err := tmpl.Execute(os.Stdout, TemplateVariables{
		Name: "name inserted",
	})
	if err != nil {
		return err
	}
	return nil

{% endraw %}

Read a file

Use template.Template.ParseFiles or template.ParseFiles If you use template.Template.ParseFiles, then use the base name of a template file.

Template features

Basic syntax

• To access an element of a slice by an index, use index $var $index

To extend a template like inheritance

• Use block or template on a base file, and define in the main file
• Pass these two files to template.Template.ParseFiles
• Use the base filename for template.New
• In the define, the variables defined outside of the block cannot be used. It’s out of scope

It was not possible to define a variable in the main file and use it on the base file, probably.