Periodically do background task while waiting for result

whilewait.go

package main

import (
	"fmt"
	"time"
)

func main() {
	c := make(chan string)
	t := time.NewTicker(200 * time.Millisecond)
	
	go func() {
		time.Sleep(1 * time.Second)
		c <- "Done!"
	}()
	
	for c != nil {
		select {
		case s := <-c:
			fmt.Printf("\n%s\n", s)
			c = nil
			t.Stop()
		case <-t.C:
			fmt.Print(".")
		}
	}
}