Add endswithsep() and use it instead of using os.sep and os.altsep directly.

This change is intended to allow hooking endswithsep() by win32mbcs
extension for MBCS support.

mercurial/cmdutil.py

@@ -462,7 +462,7 b' def copy(ui, repo, pats, opts, rename=Fa'
         if len(pats) > 1 or util.patkind(pats[0], None)[0]:
             raise util.Abort(_('with multiple sources, destination must be an '
                                'existing directory'))
-        if dest.endswith(os.sep) or os.altsep and dest.endswith(os.altsep):
+        if util.endswithsep(dest):
             raise util.Abort(_('destination %s is not a directory') % dest)
 
     tfn = targetpathfn

mercurial/dirstate.py

@@ -74,7 +74,7 b' class dirstate(object):'
         if cwd == self._root: return ''
         # self._root ends with a path separator if self._root is '/' or 'C:\'
         rootsep = self._root
-        if not rootsep.endswith(os.sep):
+        if not util.endswithsep(rootsep):
             rootsep += os.sep
         if cwd.startswith(rootsep):
             return cwd[len(rootsep):]
@@ -410,7 +410,7 b' class dirstate(object):'
 
         # self._root may end with a path separator when self._root == '/'
         common_prefix_len = len(self._root)
-        if not self._root.endswith(os.sep):
+        if not util.endswithsep(self._root):
             common_prefix_len += 1
 
         normpath = util.normpath

mercurial/util.py

@@ -341,7 +341,7 b' def canonpath(root, cwd, myname):'
     """return the canonical path of myname, given cwd and root"""
     if root == os.sep:
         rootsep = os.sep
-    elif root.endswith(os.sep):
+    elif endswithsep(root):
         rootsep = root
     else:
         rootsep = root + os.sep
@@ -882,6 +882,10 b' def needbinarypatch():'
     """return True if patches should be applied in binary mode by default."""
     return os.name == 'nt'
 
+def endswithsep(path):
+    '''Check path ends with os.sep or os.altsep.'''
+    return path.endswith(os.sep) or os.altsep and path.endswith(os.altsep)
+
 # Platform specific variants
 if os.name == 'nt':
     import msvcrt