How to Properly Register Custom Functions in Go Templates?

Golang Templates and Issues Accessing Functions Passed to Templates

When attempting to utilize a function passed to a Go template, an error can arise: "template: struct.tpl:3: function "makeGoName" not defined." To rectify this issue, custom functions must be registered prior to template parsing.

The static analyzability of templates requires this constraint. To accomplish this, create a new template using template.New() and employ the Template.ParseFiles() method of the returned template.Template type.

t, err := template.New("struct.tpl").Funcs(template.FuncMap{
    "makeGoName": makeGoName,
    "makeDBName": makeDBName,
}).ParseFiles("templates/struct.tpl")

Note that the template.New() call should specify the basename of the file being executed. Additionally, ensure error handling for Template.Execute().

if err := t.Execute(os.Stdout, data); err != nil {
    fmt.Println(err)
}

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