// It installs the strings.Title function and uses it to
// Make Title Text Look Good In Our Template's Output.
func ExampleTemplate_func() {
	// First we create a FuncMap with which to register the function.
	funcMap := template.FuncMap{
		// The name "title" is what the function will be called in the template text.
		"title": strings.Title,
	}

	// A simple template definition to test our function.

	var buf bytes.Buffer
	if _, err := buf.ReadFrom(in); err != nil {
		return fmt.Errorf("reading input: %v", err)
	}

	funcMap := template.FuncMap{
		"include": include,
		"indent":  indent,
		"trim":    trim,
	}

	tmpl, err := template.New("").Funcs(funcMap).Parse(buf.String())
	if err != nil {
		return fmt.Errorf("parsing input as text template: %v", err)
	}

// It is legal to overwrite elements of the map. The return value is the template,
// so calls can be chained.
func (t *Template) Funcs(funcMap FuncMap) *Template {
	t.init()
	t.muFuncs.Lock()
	defer t.muFuncs.Unlock()
	addValueFuncs(t.execFuncs, funcMap)
	addFuncs(t.parseFuncs, funcMap)
	return t
}

// Lookup returns the template with the given name that is associated with t.

func newTemplate(templateFilePath string) (*template.Template, error) {
	cfgTmpl, err := os.ReadFile(templateFilePath)
	if err != nil {
		return nil, err
	}

	funcMap := template.FuncMap{
		"toJSON": toJSON,
	}
	return template.New("bootstrap").Funcs(funcMap).Funcs(sprig.GenericFuncMap()).Parse(string(cfgTmpl))

func ExampleTemplate_block() {
	const (
		master  = `Names:{{block "list" .}}{{"\n"}}{{range .}}{{println "-" .}}{{end}}{{end}}`
		overlay = `{{define "list"}} {{join . ", "}}{{end}} `
	)
	var (
		funcs     = template.FuncMap{"join": strings.Join}
		guardians = []string{"Gamora", "Groot", "Nebula", "Rocket", "Star-Lord"}
	)
	masterTmpl, err := template.New("master").Funcs(funcs).Parse(master)
	if err != nil {
		log.Fatal(err)
	}

type GoTemplatePrinter struct {
	rawTemplate string
	template    *template.Template
}

func NewGoTemplatePrinter(tmpl []byte) (*GoTemplatePrinter, error) {
	t, err := template.New("output").
		Funcs(template.FuncMap{
			"exists":       exists,
			"base64decode": base64decode,
		}).
		Parse(string(tmpl))
	if err != nil {
		return nil, err
	}
	return &GoTemplatePrinter{
		rawTemplate: string(tmpl),
		template:    t,

func ExampleTemplate_block() {
	const (
		master  = `Names:{{block "list" .}}{{"\n"}}{{range .}}{{println "-" .}}{{end}}{{end}}`
		overlay = `{{define "list"}} {{join . ", "}}{{end}} `
	)
	var (
		funcs     = template.FuncMap{"join": strings.Join}
		guardians = []string{"Gamora", "Groot", "Nebula", "Rocket", "Star-Lord"}
	)
	masterTmpl, err := template.New("master").Funcs(funcs).Parse(master)
	if err != nil {
		log.Fatal(err)
	}

	c.Stdout = os.Stdout
	c.Stderr = os.Stderr
	return c.Run()
}

func applyTemplate(tmpl string, i any) (string, error) {
	t := template.New("tmpl").Funcs(template.FuncMap{
		"contains": strings.Contains,
	})

	t2 := template.Must(t.Parse(tmpl))

	var b bytes.Buffer
	if err := t2.Execute(&b, i); err != nil {
		return "", err
	}

	return b.String(), nil

	a, b, c, d string
	Shift1     []int
	Shift2     []int
	Shift3     []int
	Shift4     []int
	Table1     []uint32
	Table2     []uint32
	Table3     []uint32
	Table4     []uint32
}

var funcs = template.FuncMap{
	"dup":     dup,
	"relabel": relabel,
	"rotate":  rotate,
	"idx":     idx,
	"seq":     seq,
}

func dup(count int, x []int) []int {
	var out []int
	for i := 0; i < count; i++ {

		w.err = err
	}
	return n, err
}

// tmpl executes the given template text on data, writing the result to w.
func tmpl(w io.Writer, text string, data any) {
	t := template.New("top")
	t.Funcs(template.FuncMap{"trim": strings.TrimSpace, "capitalize": capitalize})
	template.Must(t.Parse(text))
	ew := &errWriter{w: w}
	err := t.Execute(ew, data)
	if ew.err != nil {
		// I/O error writing. Ignore write on closed pipe.