Add a command to blow everything up

By this we mean archive all open threads that haven't been active in 4
weekdays.

Currently we just log what threads we would archive.

discord-scripts/blow-everything-up.ts

@@ -0,0 +1,47 @@
+import { Client, TextChannel } from "discord.js"
+import { Robot } from "hubot"
+import moment from "moment"
+
+const GUILD: string = process.env.GUILD ?? ""
+
+function weekdaysBefore(theMoment: any, days: any) {
+  let newMoment = theMoment.clone()
+  while(days > 0) {
+    if (newMoment.isoWeekday() < 6) {
+      days -= 1
+    }
+    newMoment = newMoment.subtract(1, 'days')
+  }
+  return newMoment
+}
+
+export default async function webhookDiscord(
+  discordClient: Client,
+  robot: Robot,
+) {
+	robot.hear(/blow everything up/, async (msg) => {
+	const guild = await discordClient.guilds.fetch(GUILD)
+	const channels = await guild.channels.fetch()
+	const archiveThreshold = weekdaysBefore(moment(), 4)
+	channels
+		.filter((channel): channel is TextChannel => channel !== null && channel.isTextBased() && channel.viewable)
+		.forEach(async channel => {
+			const threads = await channel.threads.fetch()
+			threads.threads.forEach(async thread => {
+				const messages = await thread.messages.fetch({limit: 1})
+
+				const firstMessage = messages.first()
+				const lastActivity = Math.max(
+					firstMessage?.createdTimestamp ?? 0,
+					thread.archiveTimestamp ?? 0
+				)
+				if (moment(lastActivity).isAfter(archiveThreshold)) {
+					return
+				}
+
+				// await thread.setArchived(true)
+				msg.reply("We would archive", thread.name)
+			})
+		})
+	})
+}