generate list of language options automatically

go/linguaevalia/linguaevalia.go

type Language interface {
	RunFile(f *os.File) (result []byte, err error)
	Name() string
	Extension() string
}
type LanguageGeneral struct {
	Name    string
	Ext     string
	Command string
	Args    []string
	name    string
	ext     string
	command string
	args    []string
}
func (l LanguageGeneral) RunFile(f *os.File) ([]byte, error) {
	args := append(l.Args, f.Name())
	cmd := exec.Command(l.Command, args...)
	args := append(l.args, f.Name())
	cmd := exec.Command(l.command, args...)
	return cmd.CombinedOutput()
}
func (l LanguageGeneral) Extension() string { return l.Ext }
func (l LanguageGeneral) Name() string { return l.name }
func (l LanguageGeneral) Extension() string { return l.ext }
var Go = LanguageGeneral{"Go", "go", "go", []string{"run"}}
var Python = LanguageGeneral{"Python", "py", "python", []string{}}
}
func homePageHandler(w http.ResponseWriter, r *http.Request) {
	homePageTemplate.Execute(w, nil)
	bindings := map[string]interface{}{
		"languages": languageMappings,
	}
	homePageTemplate.Execute(w, bindings)
}
var homePageTemplate = template.Must(template.New("homepage").Parse(homePageTemplateStr))
}
</textarea>
      <select id="language">
        <option value="go">Go</option>
        <option value="python">Python</option>
        {{ range $short, $name := .languages }}
        <option value="{{ $short }}">{{ $name.Name }}</option>
        {{ end }}
      </select>
    </div>
    <pre id="result"></pre>