Add FileStat()

tail.go

@@ -158,6 +158,11 @@ func (tail *Tail) Tell() (offset int64, err error) {
 	return
 }
 
+// Return the file's stats
+func (tail *Tail) FileStat() (os.FileInfo, error) {
+	return tail.file.Stat()
+}
+
 // Stop stops the tailing activity.
 func (tail *Tail) Stop() error {
 	tail.Kill(nil)

tail_test.go

@@ -292,6 +292,27 @@ func TestTell(t *testing.T) {
 	tail.Cleanup()
 }
 
+func TestFileStat(t *testing.T) {
+	tailTest := NewTailTest("tell-position", t)
+	tailTest.CreateFile("test.txt", "hello\nworld\nagain\nmore\n")
+	config := Config{
+		Follow:    false,
+		MustExist: true,
+		Location:  &SeekInfo{0, os.SEEK_SET}}
+	tail := tailTest.StartTail("test.txt", config)
+	tail.reopen()
+	stat, err := tail.FileStat()
+	if err != nil {
+		tailTest.Errorf("FileStat return error: %s", err.Error())
+	}
+	if size := stat.Size(); size != 23 {
+		tailTest.Fatalf("mismatch; expected 23, but got %d", size)
+	}
+	tailTest.RemoveFile("test.txt")
+	tail.Done()
+	tail.Cleanup()
+}
+
 func TestBlockUntilExists(t *testing.T) {
 	tailTest := NewTailTest("block-until-file-exists", t)
 	config := Config{