mailer/cli/preview.ts

import { Command } from '@cliffy/command'
import { renderTemplate } from '../src/template.tsx'
import { templates, templateType } from './_templates_loader.ts'
import { promptProps } from './_prompt_template.ts'

export const cmd = new Command()
	.name('preview')
	.description('Preview a mail.')
	.type('template', templateType)
	.option(
		'-p, --port <number:number>',
		'Port to serve preview, default random free port.',
	)
	.option('-t, --template <name:template>', 'HTML template from config', {
		default: 'message',
	})
	.action(
		async ({ template, port }) => {
			const selectedTemplate = templates.get(template)!
			const props = await promptProps(selectedTemplate)

			const body = selectedTemplate.builder(props)!
			const { html, text } = await renderTemplate(body)

			Deno.serve({ port }, (req) => {
				const url = new URL(req.url)
				if (url.pathname === '/') {
					return new Response(html, {
						headers: {
							'Content-Type': 'text/html; charset=utf-8',
						},
					})
				}
				if (url.pathname === '/text') {
					return new Response(text, {
						headers: {
							'Content-Type': 'text/plain; charset=utf-8',
						},
					})
				}
				return new Response('Not found', {
					status: 404,
				})
			})
		},
	)