Golang template FuncMap that can call itself

I am trying to achieve a function to add to FuncMaps in a base template, and this function should be used to render re-useable view components

For instance:

func (v *Item) RenderComponent(componentPath string, vars ...interface{}) template.HTML {
	p := path.Join(v.folder, "components", componentPath)

	// Get the pieces of the component path.
	componentPathPieces := strings.Split(p, "/")

	// Get the last item in the pieces (this should be the file name).
	componentFileName := componentPathPieces[len(componentPathPieces)-1]

	// Make the new template using component file name and add FuncMap functions.
	t := template.New(componentFileName).Funcs(v.funcMap)

	// Determine if there is an error in the template syntax.
	t, err := template.ParseFiles(p + "." + v.extension)
	if err != nil {
		panic(err)
	}

	// Add variables to the component and write to a buffer.
	b := new(bytes.Buffer)
	if err = t.Execute(b, vars); err != nil {
		panic(err)
	}

	// Return the contents of the template buffer as a string of HTML.
	return template.HTML(b.String())
}

This code works just fine for a component that doesn't render another component. For example, I can write {{component "buttons/default-button" "some url goes here"}} and it will render the component at components/button/default-button.tmpl just fine.

However, if I include another component within that default-button component, such as {{component "icons/check-icon"}}, I will get a large error (too big to paste here). But here is one of the error messages:

> template: default-button.tmpl:4: function "component" not defined

As you can see, the error is thrown from the component file that is trying to call another component. I believe that happens because the viewFunc is either not being properly added, or is being recursively called in some way.

Oops, looked like I had a typo.

Had to change this:

// Make the new template using component file name and add FuncMap functions.
t := template.New(componentFileName).Funcs(v.funcMap)

// Determine if there is an error in the template syntax.
t, err := template.ParseFiles(p + "." + v.extension)

...to this:

// Make the new template using component file name and add FuncMap functions.
t := template.New(componentFileName + "." + v.extension).Funcs(v.funcMap) // <---- 'componentFileName' to 'componentFileName + "." + v.extension'

// Determine if there is an error in the template syntax.
t, err := t.ParseFiles(p + "." + v.extension) // <---- 'template' to 't'

I was referencing the template package instead of the t template that I created. I also passed in the wrong name for template.New, since that expects a full fill such as index.tmpl, instead of just index.

Now everything works as expected! Can call component from another component.