--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hgext/schemes.py	Tue Nov 24 17:48:23 2009 +0200
@@ -0,0 +1,82 @@
+# Copyright 2009, Alexander Solovyov <piranha@piranha.org.ua>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2, incorporated herein by reference.
+
+"""extend schemes with shortcuts to repository swarms
+
+This extension allows you to specify shortcuts for parent URLs with a
+lot of repositories to act like a scheme, for example::
+
+  [schemes]
+  py = http://code.python.org/hg/
+
+After that you can use it like::
+
+  hg clone py://trunk/
+
+Additionally there is support for some more complex schemas, for
+example used by Google Code::
+
+  [schemes]
+  gcode = http://{1}.googlecode.com/hg/
+
+The syntax is taken from Mercurial templates, and you have unlimited
+number of variables, starting with ``{1}`` and continuing with
+``{2}``, ``{3}`` and so on. This variables will receive parts of URL
+supplied, split by ``/``. Anything not specified as ``{part}`` will be
+just appended to an URL.
+
+For convenience, the extension adds these schemes by default::
+
+  [schemes]
+  py = http://hg.python.org/
+  bb = https://bitbucket.org/
+  bb+ssh = ssh://hg@bitbucket.org/
+  gcode = https://{1}.googlecode.com/hg/
+
+You can override the predefined scheme by defining new schemes with
+the same name.
+"""
+
+import re
+from mercurial import hg, templater
+
+
+class ShortRepository(object):
+    def __init__(self, url, scheme, templater):
+        self.scheme = scheme
+        self.templater = templater
+        self.url = url
+        try:
+            self.parts = max(map(int, re.findall(r'\{(\d+)\}', self.url)))
+        except ValueError:
+            self.parts = 0
+
+    def __repr__(self):
+        return '<ShortRepository: %s>' % self.scheme
+
+    def instance(self, ui, url, create):
+        url = url.split('://', 1)[1]
+        parts = url.split('/', self.parts)
+        if len(parts) > self.parts:
+            tail = parts[-1]
+            parts = parts[:-1]
+        else:
+            tail = ''
+        context = dict((str(i), v) for i, v in enumerate(parts))
+        url = ''.join(self.templater.process(self.url, context)) + tail
+        return hg._lookup(url).instance(ui, url, create)
+
+schemes = {
+    'py': 'http://hg.python.org/',
+    'bb': 'https://bitbucket.org/',
+    'bb+ssh': 'ssh://hg@bitbucket.org/',
+    'gcode': 'https://{1}.googlecode.com/hg/'
+    }
+
+def extsetup(ui):
+    schemes.update(dict(ui.configitems('schemes')))
+    t = templater.engine(lambda x: x)
+    for scheme, url in schemes.items():
+        hg.schemes[scheme] = ShortRepository(url, scheme, t)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-schemes	Tue Nov 24 17:48:23 2009 +0200
@@ -0,0 +1,22 @@
+#!/bin/sh
+
+cat <<EOF >> $HGRCPATH
+[extensions]
+schemes=
+
+[schemes]
+l = http://localhost:$HGPORT/
+EOF
+
+hg init test
+cd test
+echo a > a
+hg ci -Am initial
+
+hg serve -n test -p $HGPORT -d --pid-file=hg.pid -A access.log -E errors.log
+cat hg.pid >> $DAEMON_PIDS
+
+hg incoming l://
+
+echo % errors
+cat errors.log

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-schemes.out	Tue Nov 24 17:48:23 2009 +0200
@@ -0,0 +1,5 @@
+adding a
+comparing with l://
+searching for changes
+no changes found
+% errors