Added time tests for fs

hyde/fs.py

@@ -7,6 +7,7 @@ for common operations to provide a single interface.
 """
 
 import codecs
+from datetime import datetime
 import mimetypes
 import os
 import shutil
@@ -202,6 +203,41 @@ class File(FS):
                     break
         return False
 
+    @property
+    def is_text(self):
+        """Return true if this is a text file."""
+        return (not self.is_binary)
+
+    @property
+    def is_image(self):
+        """Return true if this is an image file."""
+        return self.mimetype.split("/")[0] == "image"
+
+
+    @property
+    def last_modified(self):
+        """
+        Returns a datetime object representing the last modified time.
+        Calls os.path.getmtime.
+
+        """
+        return datetime.fromtimestamp(os.path.getmtime(self.path))
+
+    def has_changed_since(self, basetime):
+        """
+        Returns True if the file has been changed since the given time.
+
+        """
+        return self.last_modified > basetime
+
+    def older_than(self, another_file):
+        """
+        Checks if this file is older than the given file. Uses last_modified to
+        determine age.
+
+        """
+        return another_file.last_modified > self.last_modified
+
     @staticmethod
     def make_temp(text):
         """
@@ -214,16 +250,6 @@ class File(FS):
         f.write(text)
         return f
 
-    @property
-    def is_text(self):
-        """Return true if this is a text file."""
-        return (not self.is_binary)
-
-    @property
-    def is_image(self):
-        """Return true if this is an image file."""
-        return self.mimetype.split("/")[0] == "image"
-
     def read_all(self, encoding='utf-8'):
         """
         Reads from the file and returns the content as a string.

hyde/tests/test_fs.py

@@ -56,6 +56,16 @@ def test_can_create_temp_file():
     f.delete()
     assert not f.exists
 
+def test_time_functions():
+    f1 = File(__file__)
+    t1 = f1.last_modified
+    f2 = File.make_temp("I am new")
+    t2  = f2.last_modified
+    assert t1 < t2
+    assert f2.has_changed_since(t1)
+    assert f1.older_than(f2)
+
+
 def test_path_expands_user():
     f = File("~/abc/def")
     assert f.path == os.path.expanduser("~/abc/def")
@@ -243,16 +253,18 @@ def test_move_folder():
     DATA_JUNK = DATA_ROOT.child_folder('junk')
     assert not DATA_JUNK.exists
     JINJA2.copy_contents_to(DATA_JUNK)
+    assert DATA_JUNK.exists
     for f in [HELPERS, INDEX, LAYOUT]:
         assert File(DATA_JUNK.child(f.name)).exists
-    DATA_JUNK2 = DATA_ROOT.child_folder('junk2')
-    assert DATA_JUNK.exists
+    DATA_JUNK2 = DATA_ROOT.child_folder('second_junk')
     assert not DATA_JUNK2.exists
     DATA_JUNK.move_to(DATA_JUNK2)
     assert not DATA_JUNK.exists
     assert DATA_JUNK2.exists
     for f in [HELPERS, INDEX, LAYOUT]:
-        assert File(DATA_JUNK2.child_folder('junk').child(f.name)).exists
+        assert File(DATA_JUNK2.child_folder(
+                    DATA_JUNK.name).child(
+                        f.name)).exists
 
 @with_setup(setup_data, cleanup_data)
 def test_rename_folder():