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

pkg hash/maphash, func Bytes(Seed, []uint8) uint64 #42710
pkg hash/maphash, func String(Seed, string) uint64 #42710
pkg html/template, method (*Template) Funcs(template.FuncMap) *Template #46121
pkg html/template, type FuncMap = template.FuncMap #46121
pkg net/http, method (*MaxBytesError) Error() string #30715
pkg net/http, type MaxBytesError struct #30715
pkg net/http, type MaxBytesError struct, Limit int64 #30715

	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.

	}
	t.backup()
	return nil
}

// hasFunction reports if a function name exists in the Tree's maps.
func (t *Tree) hasFunction(name string) bool {
	for _, funcMap := range t.funcs {
		if funcMap == nil {
			continue
		}
		if funcMap[name] != nil {
			return true
		}
	}
	return false
}

// popVars trims the variable list to the specified length
func (t *Tree) popVars(n int) {

	allTopics = append(allTopics, coreTopics...)
	allTopics = append(allTopics, customTopics...)
	topicMutex.Unlock()

	exec, _ := os.Executable()
	instance := exec + " - " + getLocalIP()

	funcs := template.FuncMap{
		"getTopics": getTopics,
		"normalize": normalize,
	}

	baseLayout := assets.ParseTemplate(template.New("base"), "templates/layouts/base.html")
	baseLayout = baseLayout.Funcs(funcs)

	for i := 0; i < 11; i++ {
		fmt.Fprintf(&buf, ".cov%v { color: %v }\n", i, rgb(i))
	}
	return template.CSS(buf.String())
}

var htmlTemplate = template.Must(template.New("html").Funcs(template.FuncMap{
	"colors": colors,
}).Parse(tmplHTML))

type templateData struct {
	Files []*templateFile
	Set   bool
}

// PackageName returns a name for the package being shown.

const dataDir = "testdata"

var templateTxt = readTemplate("template.txt")

func readTemplate(filename string) *template.Template {
	t := template.New(filename)
	t.Funcs(template.FuncMap{
		"node":     nodeFmt,
		"synopsis": synopsisFmt,
		"indent":   indentFmt,
	})
	return template.Must(t.ParseFiles(filepath.Join(dataDir, filename)))
}

func nodeFmt(node any, fset *token.FileSet) string {