Add functionality for writing patches in dulwich.patch.

NEWS

@@ -8,6 +8,8 @@
 
   * Add ObjectStore.tree_changes()
 
+  * Add functionality for writing patches in dulwich.patch.
+
 0.4.0	2009-10-07
 
  DOCUMENTATION

dulwich/patch.py

@@ -0,0 +1,57 @@
+# patch.py -- For dealing wih packed-style patches.
+# Copryight (C) 2009 Jelmer Vernooij <jelmer@samba.org>
+# 
+# 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; version 2
+# of the License or (at your option) a 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., 51 Franklin Street, Fifth Floor, Boston,
+# MA  02110-1301, USA.
+
+"""Classes for dealing with git am-style patches.
+
+These patches are basically unified diffs with some extra metadata tacked 
+on.
+"""
+
+import time
+
+def write_commit_patch(f, commit, progress, version=None):
+    """Write a individual file patch.
+
+    :param commit: Commit object
+    :param progress: Tuple with current patch number and total.
+    :return: tuple with filename and contents
+    """
+    (num, total) = progress
+    f.write("From %s %s\n" % (commit.id, time.ctime(commit.commit_time)))
+    f.write("From: %s\n" % commit.author)
+    f.write("Date: %s\n" % time.strftime("%a, %d %b %Y %H:%M:%S %Z"))
+    f.write("Subject: [PATCH %d/%d] %s\n" % (num, total, commit.message))
+    f.write("\n")
+    f.write("---\n")
+    f.write("TODO: Print diffstat\n")
+    f.write("\n")
+    f.write("-- \n")
+    if version is None:
+        from dulwich import __version__ as dulwich_version
+        f.write("Dulwich %d.%d.%d\n" % dulwich_version)
+    else:
+        f.write("%s\n" % version)
+
+
+def get_summary(commit):
+    """Determine the summary line for use in a filename.
+    
+    :param commit: Commit
+    :return: Summary string
+    """
+    return commit.message.splitlines()[0].replace(" ", "-")