Add jedi-based completion.

This first version only uses the Jedi completion engine after a ".", similar to
how the ClangCompleter works. It is also entirely synchronous and blocks for
quite a while the first time it is called.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "python/completers/python/jedi"]
+	path = python/completers/python/jedi
+	url = https://github.com/davidhalter/jedi.git

python/completers/python/hook.py

@@ -0,0 +1,21 @@
+# Copyright (C) 2011, 2012  Stephen Sugden <me@stephensugden.com>
+#
+# This file is part of YouCompleteMe.
+#
+# YouCompleteMe 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 3 of the License, or
+# (at your option) any later version.
+#
+# YouCompleteMe 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 YouCompleteMe.  If not, see <http://www.gnu.org/licenses/>.
+
+from jedi_completer import JediCompleter
+
+def GetCompleter():
+    return JediCompleter()

python/completers/python/jedi

@@ -0,0 +1 @@
+Subproject commit 23f36c86d7d7c5b890fef9eb9eb46cd1fe553329

python/completers/python/jedi_completer.py

@@ -0,0 +1,68 @@
+# Copyright (C) 2011, 2012  Stephen Sugden <me@stephensugden.com>
+#
+# This file is part of YouCompleteMe.
+#
+# YouCompleteMe 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 3 of the License, or
+# (at your option) any later version.
+#
+# YouCompleteMe 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 YouCompleteMe.  If not, see <http://www.gnu.org/licenses/>.
+
+import vim
+from completers.completer import Completer
+from vimsupport import PostVimMessage, CurrentLineAndColumn
+
+import sys
+from os.path import join, abspath, dirname
+
+# We need to add the jedi package to sys.path, but it's important that we clean
+# up after ourselves, because ycm.YouCompletMe.GetFiletypeCompleterForFiletype
+# removes sys.path[0] after importing completers.python.hook
+sys.path.insert(0, join(abspath(dirname(__file__)), 'jedi'))
+from jedi import Script
+sys.path.pop(0)
+
+class JediCompleter( Completer ):
+    """
+    A Completer that uses the Jedi completion engine 
+    https://jedi.readthedocs.org/en/latest/
+    """
+
+    def __init__( self ):
+        self.candidates = None
+
+    def SupportedFiletypes( self ):
+        """ Just python """
+        return ['python']
+
+    def ShouldUseNow(self, start_column):
+        """ Only use jedi-completion after a . """
+        line = vim.current.line
+        return len(line) >= start_column and line[start_column - 1] == '.'
+
+    def CandidatesFromStoredRequest( self ):
+        return self.candidates
+    
+    def OnFileReadyToParse(self):
+        pass
+
+    def AsyncCandidateRequestReady(self):
+        return self.candidates is not None
+
+    def CandidatesFromStoredRequest(self):
+        return self.candidates
+
+    def CandidatesForQueryAsync( self, query ):
+        buffer = vim.current.buffer
+        filename = buffer.name
+        line, column = CurrentLineAndColumn()
+        script = Script("\n".join(buffer), line + 1, column, filename)
+        self.candidates = [completion.word for completion
+                           in script.complete() if completion.word.startswith(query)]

python/jedi

@@ -0,0 +1 @@
+Subproject commit 23f36c86d7d7c5b890fef9eb9eb46cd1fe553329