Method start

runner/engine.go:397–456

Endless loop and never return

()

// Endless loop and never return
func (e *Engine) start() {
	if e.config.Proxy.Enabled {
		go e.proxy.Run()
		e.mainLog("Proxy server listening on http://localhost%s", e.proxy.server.Addr)
	}

	e.running.Store(true)
	firstRunCh := make(chan bool, 1)
	firstRunCh <- true

	for {
		var filename string

		select {
		case <-e.exitCh:
			e.mainDebug("exit in start")
			return
		case filename = <-e.eventCh:
			if !e.isIncludeExt(filename) && !e.checkIncludeFile(filename) {
				continue
			}
			if e.config.Build.ExcludeUnchanged {
				if !e.isModified(filename) {
					e.mainLog("skipping %s because contents unchanged", e.config.rel(filename))
					continue
				}
			}

			// cannot set buildDelay to 0, because when the write multiple events received in short time
			// it will start Multiple buildRuns: https://github.com/air-verse/air/issues/473
			time.Sleep(e.config.buildDelay())
			e.flushEvents()

			if e.config.Screen.ClearOnRebuild {
				if e.config.Screen.KeepScroll {
					// https://stackoverflow.com/questions/22891644/how-can-i-clear-the-terminal-screen-in-go
					fmt.Print("\033[2J")
				} else {
					// https://stackoverflow.com/questions/5367068/clear-a-terminal-screen-for-real/5367075#5367075
					fmt.Print("\033c")
				}
			}

			e.mainLog("%s has changed", e.config.rel(filename))
		case <-firstRunCh:
			// go down
		}

		// Stop any currently running build by closing its stop channel
		select {
		case oldStopCh := <-e.buildRunCh:
			// Close the old build's stop channel to signal it to stop
			close(oldStopCh)
		default:
			// No build is currently running
		}

		go e.buildRun()