# HG changeset patch
# User Martin von Zweigbergk <martinvonz@google.com>
# Date 2022-03-25 05:04:38
# Node ID f808417db5cc9dd9dcd9cc3bb8c1527ed65e6e0c
# Parent  7bd5f862b249bf6ba47f89bff9ef29c010db7555

bookmarks: use new function for getting first line of string

Differential Revision: https://phab.mercurial-scm.org/D12408

diff --git a/mercurial/bookmarks.py b/mercurial/bookmarks.py
--- a/mercurial/bookmarks.py
+++ b/mercurial/bookmarks.py
@@ -27,6 +27,7 @@ from . import (
     util,
 )
 from .utils import (
+    stringutil,
     urlutil,
 )
 
@@ -342,7 +343,7 @@ def _readactive(repo, marks):
     # No readline() in osutil.posixfile, reading everything is
     # cheap.
     content = repo.vfs.tryread(b'bookmarks.current')
-    mark = encoding.tolocal((content.splitlines() or [b''])[0])
+    mark = encoding.tolocal(stringutil.firstline(content))
     if mark == b'' or mark not in marks:
         mark = None
     return mark