package main

import (
	"bytes"
	"fmt"
	"os"
	"strings"
	"text/template"
)

var TMPL = strings.Trim(`
{{- /* []string expected */}}
{{- define "sasakuna"}}
{{- range $i, $text := . }}
{{$i}}: {{$text}}
{{- end }}
{{- end }}
`, "\n")

func main() {
	inlineTemplate := generateInlineTemplates(
		[]string{
			TMPL,
		})
	tmpl := template.New("")
	tmpl = template.Must(tmpl.Parse(`{{ call .InlineTemplate .Name .Data}}`))

	tmpl.Execute(os.Stdout, struct {
		Name           string
		Data           []string
		InlineTemplate func(string, any) string
	}{
		Name:           "sasakuna",
		Data:           []string{"sasa", "kuna"},
		InlineTemplate: inlineTemplate,
	})

	// Output:
	// 0: sasa
	// 1: kuna
}

func generateInlineTemplates(
	definitions []string,
) func(string, any) string {
	templates := template.New("")
	for _, def := range definitions {
		templates = template.Must(templates.Parse(def))
	}
	return func(name string, param any) string {
		buf := bytes.NewBuffer([]byte{})
		tmpl := template.Must(templates.Parse(fmt.Sprintf(`{{template "%s" .}}`, name)))
		if err := tmpl.Execute(buf, param); err != nil {
			panic(err)
		}
		return buf.String()
	}
}