Add first-class support for Pug in .astro files

[KenEucker]

Body

Summary

Pug templates are much more concise and quicker to implement compared to all of the requirements of HTML. Adding built-in support for pug templates in astro files would greatly reduce the size of source files.

Background & Motivation

I took on the task of creating this discussion after reading through this issue on GitHub and realizing that it hadn't been proposed here yet.

Users have reported the following:

"I've used Pug for years. I prefer it because life is too short to waste it closing opening tags (yes, I'm looking at you, HTML). Beyond the improved authoring experience, however, It also provides a higher signal-to-noise ratio when reading template code, which is more of a benefit than I think a lot of people may realize."

"If Astro offered first-class support for Pug in .astro files it may become the closest-to-perfect SSG in existence (just sayin')."

"It'd be nice if we could simply write Pug in place of Html in the way that .astro files current support Html."

Goals

• add pug support to astro files
• have .pug files treated similar to markdown files (and exposing Astro.props to them for dynamic stuff)
• be able to import a pug component from 'astro/components' for placing pug templates into astro templates

Example

---
import { Pug } from 'astro/components';
---

<Pug>
    h1 Hello!
    p this is a test
</Pug>

[louiss0]

I'm a fan of this idea. I think a pug renderer would also be a good idea.

[LimePotato]

this would be wonderful.

[vai]

yes please.