Implemented function scanning

src/scanner/queue.go

@@ -0,0 +1,21 @@
+package scanner
+
+import "os"
+
+// queue scans the list of files.
+func (s *scanner) queue(files ...string) {
+	for _, file := range files {
+		stat, err := os.Stat(file)
+
+		if err != nil {
+			s.errors <- err
+			return
+		}
+
+		if stat.IsDir() {
+			s.queueDirectory(file, "main")
+		} else {
+			s.queueFile(file, "main")
+		}
+	}
+}