Refactoring of the event loop:

- Use coroutines whenever possible.
- Don't pass the loop around everywhere. Use get_event_loop (just like asyncio).
- A couple of bug fixes.
- Fixed run_system_command.

examples/full-screen/split-screen.py

@@ -9,33 +9,18 @@
 
 from prompt_toolkit.application import Application
 from prompt_toolkit.buffer import Buffer
-from prompt_toolkit.eventloop.defaults import create_event_loop
 from prompt_toolkit.key_binding.defaults import load_key_bindings
 from prompt_toolkit.key_binding.key_bindings import KeyBindings, merge_key_bindings
 from prompt_toolkit.layout.containers import VSplit, HSplit, Window, Align
 from prompt_toolkit.layout.controls import BufferControl, FormattedTextControl
 from prompt_toolkit.layout.layout import Layout
 
 
-# 1. Create an event loop
-#    --------------------
-
-# We need to create an eventloop for this application. An eventloop is
-# basically a while-true loop that waits for user input, and when it receives
-# something (like a key press), it will send that to the application. Usually,
-# you want to use this `create_eventloop` shortcut, which -- according to the
-# environment (Windows/posix) -- returns something that will work there. If you
-# want to run your application inside an "asyncio" environment, you'd have to
-# pass another eventloop.
-
-loop = create_event_loop()
-
-
 # 3. Create the buffers
 #    ------------------
 
-left_buffer = Buffer(loop=loop)
-right_buffer = Buffer(loop=loop)
+left_buffer = Buffer()
+right_buffer = Buffer()
 
 # 1. First we create the layout
 #    --------------------------
@@ -150,7 +135,6 @@ def default_buffer_changed(_):
 # This glues everything together.
 
 application = Application(
-    loop=loop,
     layout=Layout(root_container, focussed_window=left_window),
     key_bindings=all_bindings,
 

examples/full-screen/yes-no-dialog.py

@@ -5,7 +5,6 @@
 
 from prompt_toolkit.application import Application
 from prompt_toolkit.contrib.completers import WordCompleter
-from prompt_toolkit.eventloop import create_event_loop, set_event_loop
 from prompt_toolkit.key_binding.bindings.focus import focus_next, focus_previous
 from prompt_toolkit.key_binding.defaults import load_key_bindings
 from prompt_toolkit.key_binding.key_bindings import KeyBindings, merge_key_bindings
@@ -19,12 +18,6 @@
 from pygments.lexers import HtmlLexer
 
 
-loop = create_event_loop()
-set_event_loop(loop)
-
-
-# >>>
-
 def accept_yes(app):
     app.set_return_value(True)
 
@@ -35,15 +28,13 @@ def do_exit(app):
     app.set_return_value(False)
 
 
-# Make partials that pass the loop everywhere.
-
 yes_button = Button(text='Yes', handler=accept_yes)
 no_button = Button(text='No', handler=accept_no)
 textfield  = TextArea(lexer=PygmentsLexer(HtmlLexer))
 checkbox1 = Checkbox(text='Checkbox')
 checkbox2 = Checkbox(text='Checkbox')
 
-radios = RadioList(loop=loop, values=[
+radios = RadioList(values=[
     ('Red', 'red'),
     ('Green', 'green'),
     ('Blue', 'blue'),
@@ -87,7 +78,7 @@ def do_exit(app):
     ),
 ])
 
-root_container = MenuContainer(loop=loop, body=root_container, menu_items=[
+root_container = MenuContainer(body=root_container, menu_items=[
     MenuItem('File', children=[
         MenuItem('New'),
         MenuItem('Open', children=[
@@ -162,7 +153,6 @@ def do_exit(app):
 
 
 application = Application(
-    loop=loop,
     layout=Layout(
         root_container,
         focussed_window=yes_button,

examples/tutorial/sqlite-cli.py

@@ -15,8 +15,8 @@
                                'delete', 'from', 'where', 'table'], ignore_case=True)
 
 style = Style.from_dict({
-    'completion-menu,current-completion': 'bg:#00aaaa #000000',
-    'completion-menu,completion': 'bg:#008888 #ffffff',
+    'completion-menu.current-completion': 'bg:#00aaaa #000000',
+    'completion-menu.completion': 'bg:#008888 #ffffff',
 })