diff --git a/pycvsanaly2/extensions/PatchLOC.py b/pycvsanaly2/extensions/PatchLOC.py
new file mode 100644
index 0000000..e0075a3
--- /dev/null
+++ b/pycvsanaly2/extensions/PatchLOC.py
@@ -0,0 +1,166 @@
+# Copyright (C) 2011 Alexander Pepper
+#
+# This program 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+#
+# Authors :
+#       Alexander Pepper <pepper@inf.fu-berlin.de>
+
+from pycvsanaly2.Database import SqliteDatabase, MysqlDatabase, statement, \
+    ICursor, execute_statement, TableAlreadyExists
+from pycvsanaly2.extensions import Extension, register_extension, \
+    ExtensionRunError
+from pycvsanaly2.utils import printdbg, printerr, printout, uri_to_filename, \
+    to_utf8
+from pycvsanaly2.profile import profiler_start, profiler_stop
+import re
+
+class PatchLOC(Extension):
+    deps = ['Patches']
+    INTERVAL_SIZE = 100
+    patterns = {}
+    patterns['old_file'] = re.compile("^--- a")
+    patterns['no_old_file'] = re.compile("^--- \/dev\/null")
+    patterns['new_file'] = re.compile("^\+\+\+ b")
+    patterns['no_new_file'] = re.compile("^\+\+\+ \/dev\/null")
+    patterns['added'] = re.compile("^\+.?")#"^\+(?!\+)"
+    patterns['removed'] = re.compile("^-.?")#"^-(?!-)"
+
+    def __init__(self):
+        self.db = None
+
+    def __create_table(self, cnn):
+        cursor = cnn.cursor()
+
+        if isinstance(self.db, SqliteDatabase):
+            import sqlite3.dbapi2
+
+            try:
+                cursor.execute("""CREATE TABLE patch_lines (
+                                id integer primary key AUTOINCREMENT,
+                                commit_id integer NOT NULL,
+                                file_id integer NOT NULL,
+                                added integer,
+                                removed integer,
+                                UNIQUE(commit_id, file_id)
+                                )""")
+            except sqlite3.dbapi2.OperationalError:
+                cursor.close()
+                raise TableAlreadyExists
+            except:
+                raise
+        elif isinstance(self.db, MysqlDatabase):
+            import MySQLdb
+
+            try:
+                cursor.execute("""CREATE TABLE patch_lines (
+                                id integer primary key auto_increment,
+                                commit_id integer NOT NULL,
+                                file_id integer NOT NULL,
+                                added int,
+                                removed int,
+                                UNIQUE(commit_id, file_id)
+                                ) CHARACTER SET=utf8""")
+            except MySQLdb.OperationalError, e:
+                if e.args[0] == 1050:
+                    cursor.close()
+                    raise TableAlreadyExists
+                raise
+            except:
+                raise
+
+        cnn.commit()
+        cursor.close()
+
+    def get_patches(self, repo, repo_uri, repo_id, db, cursor):
+        icursor = ICursor(cursor, self.INTERVAL_SIZE)
+        # Get the patches from this repository
+        query = """select p.commit_id, p.file_id, p.patch, s.rev
+                    from patches p, scmlog s
+                    where p.commit_id = s.id and
+                    s.repository_id = ? and
+                    p.patch is not NULL"""
+        icursor.execute(statement(query, db.place_holder), (repo_id,))
+        rs = icursor.fetchmany()
+        while rs:
+            for commit_id, file_id, patch_content, rev in rs:
+                yield (commit_id, file_id, to_utf8(patch_content), rev)
+            rs = icursor.fetchmany()
+
+    def count_lines(self, patch_content):
+        added = 0
+        removed = 0
+
+        for line in patch_content.splitlines():
+            if self.patterns['old_file'].match(line) or self.patterns['no_old_file'].match(line):
+                # skip line
+                continue
+            elif self.patterns['new_file'].match(line) or self.patterns['no_new_file'].match(line):
+                # skip line
+                continue
+            elif self.patterns['added'].match(line):
+                added += 1
+            elif self.patterns['removed'].match(line):
+                removed += 1
+
+        return (added, removed)
+
+    def run(self, repo, uri, db):
+        profiler_start("Running PatchLOC extension")
+
+        # Open a connection to the database and get cursors
+        self.db = db
+        connection = self.db.connect()
+        cursor = connection.cursor()
+
+        path = uri_to_filename(uri)
+        if path is not None:
+            repo_uri = repo.get_uri_for_path(path)
+        else:
+            repo_uri = uri
+
+        cursor.execute(statement("SELECT id from repositories where uri = ?",
+                                 db.place_holder), (repo_uri,))
+        repo_id = cursor.fetchone()[0]
+
+        try:
+            self.__create_table(connection)
+        except TableAlreadyExists:
+            pass
+        except Exception, e:
+            raise ExtensionRunError(str(e))
+
+        patches = self.get_patches(repo, path or repo.get_uri(), repo_id, db,
+                                   cursor)
+
+        for commit_id, file_id, patch_content, rev in patches:
+            (added, removed) = self.count_lines(patch_content)
+            insert = """insert into patch_lines(file_id, commit_id,
+                        added, removed)
+                        values(?,?,?,?)"""
+            execute_statement(statement(insert, db.place_holder),
+                              (file_id, commit_id, added, removed),
+                               cursor,
+                               db,
+                               "Couldn't insert patch, dup record?",
+                               exception=ExtensionRunError)
+            connection.commit()
+
+        cursor.close()
+        connection.commit()
+        connection.close()
+
+        profiler_stop("Running PatchLOC extension", delete=True)
+
+register_extension("PatchLOC", PatchLOC)