[PATCH] diffstat hook example

[Alexander Solovyov]

# HG changeset patch
# User Alexander Solovyov <piranha at piranha.org.ua>
# Date 1238078987 -7200
# Node ID 45434eeae0fe71eb54097e5af750da30ef29aeb2
# Parent  67e59a9886d5902de5b94cd2552d854b6292ec63
diffstat hook example

diff --git a/contrib/python-hook-examples.py b/contrib/python-hook-examples.py
new file mode 100644
--- /dev/null
+++ b/contrib/python-hook-examples.py
@@ -0,0 +1,27 @@
+'''
+This is examples of useful hooks in Python for Mercurial.
+
+To use them, put file containing hooks somewhere in the Python path and edit
+your hg config to use them.
+'''
+
+from mercurial import patch, util
+
+
+def diffstat(ui, repo, **kwargs):
+    '''Use it like:
+
+    [hooks]
+    commit.diffstat = python:hghooks.diffstat
+    changegroup.diffstat = python:hghooks.diffstat
+    '''
+    if kwargs.get('parent2'):
+        return
+    node = kwargs['node']
+    first = repo[node].parents()[0].node()
+    if 'url' in kwargs:
+        last = repo['tip'].node()
+    else:
+        last = node
+    diff = patch.diff(repo, first, last)
+    ui.write(patch.diffstat(util.iterlines(diff)))