moved md5 versioning to hash/__init__.py

added sha1 versioning to hash versioning

compress/versioning/md5/__init__.py → compress/versioning/hash/__init__.py

 import cStringIO
-import md5
+from hashlib import md5, sha1
 import os
 
 from compress.conf import settings
-
 from compress.utils import concat, get_output_filename
 from compress.versioning.base import VersioningBase
 
-def get_md5(f, CHUNK=2**16):
-    m = md5.new()
-    while 1:
-        chunk = f.read(CHUNK)
-        if not chunk:
-            break
-        m.update(chunk)
-    return m.hexdigest()
-
-class MD5Versioning(VersioningBase):
+class HashVersioningBase(VersioningBase):
+    def __init__(self, hash_method):
+        self.hash_method = hash_method
     
-    def get_version(self, source_files):
-        buf = concat(source_files)
-        s = cStringIO.StringIO(buf)
-        version = get_md5(s)
-        s.close()
-        return version
-        
     def needs_update(self, output_file, source_files, version):
         output_file_name = get_output_filename(output_file, version)
         ph = settings.COMPRESS_VERSION_PLACEHOLDER
@@ -35,4 +20,28 @@ class MD5Versioning(VersioningBase):
             return (version != old_version), version
         except ValueError:
             # no placeholder found, do not update, manual update if needed
-            return False, version
\ No newline at end of file
+            return False, version
+            
+    def get_version(self, source_files):
+        buf = concat(source_files)
+        s = cStringIO.StringIO(buf)
+        version = self.get_hash(s)
+        s.close()
+        return version            
+            
+    def get_hash(self, f, CHUNK=2**16):
+        m = self.hash_method()
+        while 1:
+            chunk = f.read(CHUNK)
+            if not chunk:
+                break
+            m.update(chunk)
+        return m.hexdigest()
+
+class MD5Versioning(HashVersioningBase):
+    def __init__(self):
+        super(MD5Versioning, self).__init__(md5)
+
+class SHA1Versioning(HashVersioningBase):
+    def __init__(self):
+        super(SHA1Versioning, self).__init__(sha1)
\ No newline at end of file