Add relpath module, for python < 2.6.0

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@3541 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/wizard/relpath.py b/wizard/relpath.py
new file mode 100644 (file)
index 0000000..045f617
--- /dev/null
+++ b/wizard/relpath.py
@@ -0,0 +1,89 @@
+#!/usr/bin/env python
+# encoding: utf-8
+#
+# This file is part of BeRTOS.
+#
+# Bertos is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+# As a special exception, you may use this file as part of a free software
+# library without restriction.  Specifically, if other files instantiate
+# templates or use macros or inline functions from this file, or you compile
+# this file and link it with other files to produce an executable, this
+# file does not by itself cause the resulting executable to be covered by
+# the GNU General Public License.  This exception does not however
+# invalidate any other reasons why the executable file might be covered by
+# the GNU General Public License.
+#
+# Copyright 2008 Develer S.r.l. (http://www.develer.com/)
+#
+# $Id$
+#
+# Author: Lorenzo Berni <duplo@develer.com>
+#
+
+import sys
+
+if sys.version_info < (2, 6, 0):
+    from os.path import *
+    def _posix_relpath(path, start="."):
+        """Return a relative version of a path"""
+
+        if not path:
+            raise ValueError("no path specified")
+
+        start_list = abspath(start).split(sep)
+        path_list = abspath(path).split(sep)
+
+        # Work out how much of the filepath is shared by start and path.
+        i = len(commonprefix([start_list, path_list]))
+
+        rel_list = [pardir] * (len(start_list)-i) + path_list[i:]
+        if not rel_list:
+            return curdir
+        return join(*rel_list)
+
+    def _nt_relpath(path, start="."):
+        """Return a relative version of a path"""
+
+        if not path:
+            raise ValueError("no path specified")
+        start_list = abspath(start).split(sep)
+        path_list = abspath(path).split(sep)
+        if start_list[0].lower() != path_list[0].lower():
+            unc_path, rest = splitunc(path)
+            unc_start, rest = splitunc(start)
+            if bool(unc_path) ^ bool(unc_start):
+                raise ValueError("Cannot mix UNC and non-UNC paths (%s and %s)"
+                                                                    % (path, start))
+            else:
+                raise ValueError("path is on drive %s, start on drive %s"
+                                                    % (path_list[0], start_list[0]))
+        # Work out how much of the filepath is shared by start and path.
+        for i in range(min(len(start_list), len(path_list))):
+            if start_list[i].lower() != path_list[i].lower():
+                break
+        else:
+            i += 1
+
+        rel_list = [pardir] * (len(start_list)-i) + path_list[i:]
+        if not rel_list:
+            return curdir
+        return join(*rel_list)
+
+    import posixpath
+    posixpath.relpath = _posix_relpath
+    import ntpath
+    ntpath.relpath = _nt_relpath
+from os.path import relpath