Add progression reporting.

examples/run_wait

@@ -0,0 +1,6 @@
+#!/usr/bin/bash
+set -e
+cd "$(dirname "$(realpath "$0")")"
+
+
+../src/regar.ts --hard --progress 'sleep 2s' wdir

package/deploy

@@ -0,0 +1,6 @@
+#!/usr/bin/bash
+set -e
+cd "$(dirname "$(realpath "$0")")"
+
+./release/package
+./aur/package

src/regar.ts

@@ -5,13 +5,13 @@ import { Command } from "https://deno.land/x/cliffy@v1.0.0-rc.4/command/mod.ts"
 import { Channel, Constructible, InstanceOf } from "https://git.barnulf.net/mb/barnulf_ts/raw/branch/master/mod.ts"
 import { wait } from "https://git.barnulf.net/mb/barnulf_ts/raw/branch/master/src/lib/utils.ts"
 
-const version = "1.0.0"
+const version = "1.1.0"
 
 async function main() {
-	const { do_clear, command, extensions, files, strategy, go_up } = await parse_args()
+	const { do_clear, command, extensions, files, strategy, go_up, show_progress } = await parse_args()
 	const channel = new Channel<Event>()
 	files.map((path) => new Watcher(path, extensions).spin(channel))
-	new Runner(command, strategy, do_clear, go_up).spin(channel)
+	new Runner(command, strategy, do_clear, go_up, show_progress).spin(channel)
 }
 
 async function parse_args() {
@@ -26,6 +26,7 @@ async function parse_args() {
 		.option("-e, --extensions <extentions>", "Comma separated whitelist of extensions to whatch.")
 		.option("-c, --clear", "Clear the terminal on restart.", { default: false })
 		.option("-u, --up", "Scroll the terminal to the start of the command at each run.", { default: false })
+		.option("-p, --progress", "Show estimated progress on subsequent runs.", { default: false })
 		.help({ colors: false })
 	const { args, options } = await cmd.parse()
 	const [command, ...files] = args
@@ -36,7 +37,8 @@ async function parse_args() {
 	const extensions = options.extensions?.split(",")
 	const do_clear = options.clear
 	const go_up = options.up
-	return { command, files, strategy, extensions, do_clear, go_up }
+	const show_progress = options.progress
+	return { command, files, strategy, extensions, do_clear, go_up, show_progress }
 }
 
 class Watcher {
@@ -67,6 +69,7 @@ class Runner {
 		private strategy: ShutdownStrategy,
 		private do_clear: boolean,
 		private go_up: boolean,
+		private show_progress: boolean,
 	) {}
 
 	public async spin(channel: Channel<Event>) {
@@ -89,7 +92,9 @@ class Runner {
 		log("running", this.command)
 		console.log()
 		const process = new Deno.Command("sh", { args }).spawn()
-		process.status.then(this.on_end())
+		let stop: Stop | undefined = undefined
+		if (this.show_progress) stop = this.start_progress()
+		process.status.then(this.on_end(stop))
 		return process
 	}
 
@@ -101,20 +106,22 @@ class Runner {
 	private last_event_date_ms = 0
 	private debouncing(event: Event) {
 		const delay_ms = event.date_ms - this.last_event_date_ms
-		const threshold_ms = 100
+		const threshold_ms = 150
 		if (delay_ms < threshold_ms) return true
 		this.last_event_date_ms = event.date_ms
 		return false
 	}
 
-	private on_end() {
+	private on_end(stop: Stop | undefined) {
 		if (this.go_up) this.save_cursor()
 		const start_ms = Date.now()
-		return () => {
+		return (status: Deno.CommandStatus) => {
 			const end_ms = Date.now()
 			const time_ms = end_ms - start_ms
+			if (status.success) this.time_estimation_ms = time_ms
 			const secs = time_ms / 1000
 			if (this.go_up) this.restore_cursor()
+			if (stop !== undefined) stop.stop = true
 			log("terminated", `${secs} s`)
 		}
 	}
@@ -126,7 +133,25 @@ class Runner {
 	private restore_cursor() {
 		console.log("\x1b[u")
 	}
+
+	time_estimation_ms = 0
+	private start_progress() {
+		const stop = { stop: false }
+		;(async () => {
+			for await (const step of progress(this.time_estimation_ms)) {
+				if (stop.stop) break
+				const secs = (Math.floor(step.ms / 100) / 10).toString().padStart(3)
+				const total = Math.floor(this.time_estimation_ms / 1_000).toString().padStart(3)
+				const perc = (Math.floor(step.relative * 1_000) / 10).toString().padStart(5)
+				log("progress", `${secs} s / ${total} s (${perc} %)\x1bM`)
 			}
+		})()
+
+		return stop
+	}
+}
+
+type Stop = { stop: boolean }
 
 interface ShutdownStrategy {
 	/** Returns wether the child has been shutdown. */
@@ -173,6 +198,18 @@ function try_signal(pid: number, sig: Deno.Signal) {
 	)
 }
 
+async function* progress(time_ms: number, step_ms = 100) {
+	const start = Date.now()
+	yield { ms: 0., relative: 0. }
+	while (true) {
+		const ellapsed = Date.now() - start
+		if (ellapsed > time_ms) break
+		yield { ms: ellapsed, relative: ellapsed / time_ms }
+		await wait(step_ms)
+	}
+	yield { ms: time_ms, relative: 1. }
+}
+
 // deno-lint-ignore no-explicit-any
 type Catching<C extends Constructible<C, any>, R = void> = [
 	exception: C,
@@ -199,7 +236,7 @@ function log(verb: string, value: unknown) {
 	const bold = "\x1b[1m"
 	const reset = "\x1b[0m"
 	console.log(
-		`` +
+		`\x1b[2K` +
 			`${yellow}${bold}${verb.padStart(12)}${reset}` +
 			` ` +
 			`${yellow}${value}${reset}`,