feat(chore): add support of custom mail templates

cli/send.ts

@@ -1,25 +1,60 @@
-import { Command } from '@cliffy/command/mod.ts'
+import { Command, EnumType } from '@cliffy/command/mod.ts'
+import { Input } from '@cliffy/prompt/mod.ts'
 import { Contact } from '../src/contact.ts'
 import { send } from '../src/send.ts'
-import type { Mail } from '../types.ts'
+import type { Mail, Template } from '../types.ts'
+import type { JSX } from 'preact'
+
+const templates: Map<
+	string,
+	Template<
+		(props: Record<string, unknown>) => JSX.Element,
+		Record<string, unknown>
+	>
+> = new Map()
+
+const templatesDir = import.meta.resolve('../templates').slice('file://'.length)
+
+//Load templates dynamicaly
+for await (
+	const template of Deno.readDir(templatesDir)
+) {
+	if (template.isFile && template.name.endsWith('.tsx')) {
+		const modPath = new URL(
+			template.name,
+			`${import.meta.resolve('../templates')}/`,
+		)
+		const mod = await import(modPath.href)
+		templates.set(mod.default.name, mod.default)
+	}
+}
+
+const templateType = new EnumType([...templates.keys()])
 
 export const cmd = new Command()
 	.name('send')
 	.description('Send a mail.')
+	.type('template', templateType)
 	.option(
 		'-f, --from <account:string>',
 		'From mail account or short name from config.',
 		{ default: '!me' },
 	)
+	.option('-r, --recipient <recipient:string>', 'Recipient (to) of the mail.', {
+		required: true,
+		collect: true,
+	})
 	.option('--cc <recipient:string>', 'Copy carbon.', { collect: true })
 	.option('--cci <recipient:string>', 'Copy carbon invisible.', {
 		collect: true,
 	})
 	.option('-a, --attachments <file:file>', 'Attachments.', { collect: true })
-	//.option('-t, --template <name:template>', 'HTML template from config', { default: 'message' })
+	.option('-t, --template <name:template>', 'HTML template from config', {
-	.arguments('<to:string> <subject:string> <body:string>')
+		default: 'message',
+	})
+	.arguments('<subject:string>')
 	.action(
-		async ({ from, cc, cci, attachments }, to, subject, body) => {
+		async ({ from, recipient, cc, cci, attachments, template }, subject) => {
 			const fromContact: Contact = await (async () => {
 				if (from === '!me') {
 					const whoami = new Deno.Command('whoami', {
@@ -29,10 +64,10 @@ export const cmd = new Command()
 					const rawName = new TextDecoder().decode(stdout).trim()
 					const name = encodeURIComponent(rawName)
 
-					return {
+					return new Contact({
 						name: `${name} de Cohabit`,
 						address: `_${name}_@cohabit.fr`,
-					}
+					})
 				}
 				if (from.startsWith('!')) {
 					//@ts-ignore try expand
@@ -41,11 +76,48 @@ export const cmd = new Command()
 				return Contact.fromString(from)
 			})()
 
+			const selectedTemplate = templates.get(template)!
+			type Props = typeof selectedTemplate
+			const props: Partial<Props> = {}
+			for (const prop of selectedTemplate.props) {
+				if (prop.multiline) {
+					console.log(
+						`%c?%c ${prop.description} %c[end input with "!EOL" on a new line] %c›`,
+						'color: yellow;',
+						'font-weight: bold',
+						'color: white',
+						'color: blue',
+					)
+
+					const decoder = new TextDecoder()
+					for await (const chunk of Deno.stdin.readable) {
+						const text = decoder.decode(chunk)
+						if (text.startsWith('!EOF\n')) {
+							break
+						}
+						//@ts-ignore TODO fix type inference
+						props[prop.tag] += text
+					}
+					//@ts-ignore TODO fix type inference
+					if (props[prop.tag].startsWith('undefined')) {
+						//@ts-ignore TODO fix type inference
+						props[prop.tag] = props[prop.tag].slice('undefined'.length)
+					}
+				} else {
+					const value = await Input.prompt({
+						message: prop.description,
+					})
+
+					//@ts-ignore TODO fix type inference
+					props[prop.tag] = value
+				}
+			}
+
 			const mail: Mail = {
 				from: fromContact,
-				to: [Contact.fromString(to)],
+				to: recipient.map((to) => Contact.fromString(to)),
 				subject,
-				body,
+				body: selectedTemplate.builder(props)!,
 				options: {
 					cc: cc?.map(Contact.fromString) ?? [],
 					cci: cci?.map(Contact.fromString) ?? [],

deno.lock

@@ -3862,15 +3862,30 @@
     "https://esm.sh/@types/nodemailer": "https://esm.sh/v135/@types/nodemailer@6.4.14/index.d.ts"
   },
   "remote": {
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@@ -3920,6 +3935,25 @@
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src/send.ts

@@ -1,15 +1,18 @@
 import type { Mail } from '../types.ts'
+import { renderTemplate } from './template.tsx'
 import { transporter } from './transporter.ts'
 
-export function send(mail: Mail) {
+export async function send(mail: Mail) {
+	const { html, text } = await renderTemplate(mail.body)
+
 	return transporter.sendMail({
 		from: mail.from.toString(),
 		to: mail.to.map((contact) => contact.toString()),
 		cc: mail.options.cc.map((cc) => cc.toString()),
 		bcc: mail.options.cci.map((cci) => cci.toString()),
 		subject: mail.subject,
-		text: 'Text only',
+		text,
-		html: mail.body.toString(),
+		html,
 		attachments: mail.options.attachments.map((path) => ({ path })),
 	})
 }