Don't use fail function in findMarkupFiles()

main.go

@@ -1,6 +1,9 @@
 package main
 
-import "os"
+import (
+	"os"
+	"sync"
+)
 
 const filesCapacity = 1024
 
@@ -8,13 +11,23 @@ func main() {
 	args, err := getArguments(nil)
 
 	if err != nil {
-		printToStderr(err.Error())
-		os.Exit(1)
+		fail(err)
 	}
 
 	fc := make(chan string, filesCapacity)
+	ec := make(chan error, 64)
+	wg := sync.WaitGroup{}
+
+	go findMarkupFiles(args.filenames, args.recursive, fc, ec)
 
-	go findMarkupFiles(args.filenames, args.recursive, fc)
+	wg.Add(1)
+	go func() {
+		for e := range ec {
+			fail(e)
+		}
+
+		wg.Done()
+	}()
 
 	rc := make(chan fileResult, filesCapacity)
 	s := newSemaphore(args.concurrency)
@@ -33,6 +46,8 @@ func main() {
 		}
 	}
 
+	wg.Wait()
+
 	if !ok {
 		os.Exit(1)
 	}

utils.go

@@ -55,27 +55,28 @@ func listDirectory(d string, fc chan<- string) error {
 	})
 }
 
-func findMarkupFiles(fs []string, recursive bool, fc chan<- string) {
+func findMarkupFiles(fs []string, recursive bool, fc chan<- string, ec chan<- error) {
 	for _, f := range fs {
 		i, err := os.Stat(f)
 
 		if err != nil {
-			fail(err)
+			ec <- err
+			continue
 		}
 
 		if i.IsDir() && recursive {
 			err := listDirectory(f, fc)
 
 			if err != nil {
-				fail(err)
+				ec <- err
 			}
-
 		} else if i.IsDir() {
-			fail(fmt.Errorf("%v is not a file", f))
+			ec <- fmt.Errorf("%v is not a file", f)
 		} else {
 			fc <- f
 		}
 	}
 
 	close(fc)
+	close(ec)
 }