bookmarks: add a warning for non empty malformed line

mercurial/bookmarks.py

@@ -28,6 +28,9 b' def read(repo):'
         for line in repo.opener('bookmarks'):
             line = line.strip()
             if ' ' not in line:
+                if line:
+                    msg = _('malformed line in .hg/bookmarks: %r\n')
+                    repo.ui.warn( msg % line)
                 continue
             sha, refspec = line.strip().split(' ', 1)
             refspec = encoding.tolocal(refspec)

tests/test-bookmarks.t

@@ -350,3 +350,11 b' test wrongly formated bookmark'
      Y                         2:db815d6d32e6
    * Z                         3:125c9a1d6df6
      x  y                      2:db815d6d32e6
+  $ echo "Ican'thasformatedlines" >> .hg/bookmarks
+  $ hg bookmarks
+  malformed line in .hg/bookmarks: "Ican'thasformatedlines"
+     X2                        1:925d80f479bb
+     Y                         2:db815d6d32e6
+   * Z                         3:125c9a1d6df6
+     x  y                      2:db815d6d32e6
+