feat(cmd.fast): add flag for upload speed, show spinner

cmd/fast/main.go

@@ -1,9 +1,61 @@
 package main
 
 import (
+	"flag"
+	"fmt"
+	"log"
+	"sync"
+	"time"
+
 	"github.com/adhocore/fast/internal/fast"
 )
 
 func main() {
-	fast.Run()
+	var noUp bool
+	var wg sync.WaitGroup
+
+	flag.BoolVar(&noUp, "noup", false, "Do not show upload speed (shows only download speed)")
+	flag.Parse()
+	wg.Add(1)
+
+	ch := make(chan bool)
+
+	go doSpin(ch)
+	go doFast(ch, &wg, noUp)
+
+	wg.Wait()
+}
+
+func doSpin(ch chan bool) {
+	chars := []string{"+", "\\", "|", "/", "-", "+", "\\", "|", "/", "-"}
+
+	for {
+	outer:
+		select {
+		case _, ok := <-ch:
+			if ok {
+				fmt.Print("\010")
+				break outer
+			}
+		default:
+			for _, c := range chars {
+				fmt.Print(c, "\010")
+				time.Sleep(50 * time.Millisecond)
+			}
+		}
+	}
+}
+
+func doFast(ch chan bool, wg *sync.WaitGroup, noUp bool) {
+	defer wg.Done()
+
+	start := time.Now()
+	res, err := fast.Measure(noUp)
+	ch <- true
+
+	if err != nil {
+		log.Fatalf("error measuring speed: %v", err)
+	}
+
+	fast.Out(res, start)
 }