Merge pull request #2281 from xonsh/events_docs

A few doc fixes

docs/conf.py

@@ -11,16 +11,24 @@ import os
 import sys
 import builtins
 import inspect
+import importlib
 
 os.environ['XONSH_DEBUG'] = '1'
 
 from xonsh import __version__ as XONSH_VERSION
 from xonsh.environ import DEFAULT_DOCS, Env
 from xonsh.xontribs import xontrib_metadata
-from xonsh.events import events
 from xonsh import main
 from xonsh.commands_cache import CommandsCache
 
+spec = importlib.util.find_spec('prompt_toolkit')
+if spec is not None:
+    # hacky runaround to import PTK-specific events
+    builtins.__xonsh_env__ = Env()
+    from xonsh.ptk.shell import events
+else:
+    from xonsh.events import events
+
 sys.path.insert(0, os.path.dirname(__file__))
 
 def setup(sphinx):

requirements-docs.txt

@@ -1,3 +1,4 @@
 cloud_sptheme
 numpydoc==0.5
 Sphinx
+prompt_toolkit