--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/piecrust/cache.py	Sat Dec 21 14:44:02 2013 -0800
@@ -0,0 +1,46 @@
+import os
+import os.path
+import codecs
+
+
+class SimpleCache(object):
+    def __init__(self, base_dir):
+        if not os.path.isdir(base_dir):
+            os.makedirs(base_dir, 0755)
+        self.base_dir = base_dir
+
+    def isValid(self, path, time):
+        cache_time = self.getCacheTime(path)
+        if cache_time is None:
+            return False
+        if isinstance(time, list):
+            for t in time:
+                if cache_time < t:
+                    return False
+            return True
+        return cache_time >= time
+
+    def getCacheTime(self, path):
+        cache_path = self.getCachePath(path)
+        try:
+            return os.path.getmtime(cache_path)
+        except os.error:
+            return None
+
+    def has(self, path):
+        cache_path = self.getCachePath(path)
+        return os.path.isfile(cache_path)
+
+    def read(self, path):
+        cache_path = self.getCachePath(path)
+        with codecs.open(cache_path, 'r', 'utf-8') as fp:
+            return fp.read()
+
+    def write(self, path, content):
+        cache_path = self.getCachePath(path)
+        cache_dir = os.path.dirname(cache_path)
+        if not os.path.isdir(cache_dir):
+            os.makedirs(cache_dir, 0755)
+        with codecs.open(cache_path, 'w', 'utf-8') as fp:
+            fp.write(content)
+