Move permutations from test_objects to misc.

Change-Id: Idfda34da5603521c7c3b9b8adb3d8f031bb2d327

dulwich/misc.py

@@ -101,6 +101,40 @@ def unpack_from(fmt, buf, offset=0):
         return struct.unpack(fmt, b)
 
 
+try:
+    from itertools import permutations
+except ImportError:
+    # Implementation of permutations from Python 2.6 documentation:
+    # http://docs.python.org/2.6/library/itertools.html#itertools.permutations
+    # Copyright (c) 2001-2010 Python Software Foundation; All Rights Reserved
+    # Modified syntax slightly to run under Python 2.4.
+    def permutations(iterable, r=None):
+        # permutations('ABCD', 2) --> AB AC AD BA BC BD CA CB CD DA DB DC
+        # permutations(range(3)) --> 012 021 102 120 201 210
+        pool = tuple(iterable)
+        n = len(pool)
+        if r is None:
+            r = n
+        if r > n:
+            return
+        indices = range(n)
+        cycles = range(n, n-r, -1)
+        yield tuple(pool[i] for i in indices[:r])
+        while n:
+            for i in reversed(range(r)):
+                cycles[i] -= 1
+                if cycles[i] == 0:
+                    indices[i:] = indices[i+1:] + indices[i:i+1]
+                    cycles[i] = n - i
+                else:
+                    j = cycles[i]
+                    indices[i], indices[-j] = indices[-j], indices[i]
+                    yield tuple(pool[i] for i in indices[:r])
+                    break
+            else:
+                return
+
+
 try:
     from collections import namedtuple
 

dulwich/tests/test_objects.py

@@ -30,6 +30,9 @@ import stat
 from dulwich.errors import (
     ObjectFormatException,
     )
+from dulwich.misc import (
+    permutations,
+    )
 from dulwich.objects import (
     Blob,
     Tree,
@@ -64,40 +67,6 @@ tree_sha = '70c190eb48fa8bbb50ddc692a17b44cb781af7f6'
 tag_sha = '71033db03a03c6a36721efcf1968dd8f8e0cf023'
 
 
-try:
-    from itertools import permutations
-except ImportError:
-    # Implementation of permutations from Python 2.6 documentation:
-    # http://docs.python.org/2.6/library/itertools.html#itertools.permutations
-    # Copyright (c) 2001-2010 Python Software Foundation; All Rights Reserved
-    # Modified syntax slightly to run under Python 2.4.
-    def permutations(iterable, r=None):
-        # permutations('ABCD', 2) --> AB AC AD BA BC BD CA CB CD DA DB DC
-        # permutations(range(3)) --> 012 021 102 120 201 210
-        pool = tuple(iterable)
-        n = len(pool)
-        if r is None:
-            r = n
-        if r > n:
-            return
-        indices = range(n)
-        cycles = range(n, n-r, -1)
-        yield tuple(pool[i] for i in indices[:r])
-        while n:
-            for i in reversed(range(r)):
-                cycles[i] -= 1
-                if cycles[i] == 0:
-                    indices[i:] = indices[i+1:] + indices[i:i+1]
-                    cycles[i] = n - i
-                else:
-                    j = cycles[i]
-                    indices[i], indices[-j] = indices[-j], indices[i]
-                    yield tuple(pool[i] for i in indices[:r])
-                    break
-            else:
-                return
-
-
 class TestHexToSha(TestCase):
 
     def test_simple(self):