[facebook] Fix support for untitled videos (Fixes #3757)

1 files changed, 10 insertions, 0 deletions

diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 247788078..3ac0f1f54 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -1571,3 +1571,13 @@ except AttributeError:
         if ret:
             raise subprocess.CalledProcessError(ret, p.args, output=output)
         return output
+
+
+def limit_length(s, length):
+    """ Add ellipses to overly long strings """
+    if s is None:
+        return None
+    ELLIPSES = '...'
+    if len(s) > length:
+        return s[:length - len(ELLIPSES)] + ELLIPSES
+    return s