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#!/usr/bin/env python
"""
An example of how to deal with slow auto completion code.
- Running the completions in a thread is possible by wrapping the
`Completer` object in a `ThreadedCompleter`. This makes sure that the
``get_completions`` generator is executed in a background thread.
For the `prompt` shortcut, we don't have to wrap the completer ourselves.
Passing `complete_in_thread=True` is sufficient.
- We also set a `loading` boolean in the completer function to keep track of
when the completer is running, and display this in the toolbar.
"""
from __future__ import unicode_literals
from prompt_toolkit.completion import Completer, Completion
from prompt_toolkit.shortcuts import prompt, CompleteStyle
import time
WORDS = [
'alligator', 'ant', 'ape', 'bat', 'bear', 'beaver', 'bee', 'bison',
'butterfly', 'cat', 'chicken', 'crocodile', 'dinosaur', 'dog', 'dolphin',
'dove', 'duck', 'eagle', 'elephant', 'fish', 'goat', 'gorilla', 'kangaroo',
'leopard', 'lion', 'mouse', 'rabbit', 'rat', 'snake', 'spider', 'turkey',
'turtle',
]
class SlowCompleter(Completer):
"""
This is a completer that's very slow.
"""
def __init__(self):
self.loading = 0
def get_completions(self, document, complete_event):
# Keep count of how many completion generators are running.
self.loading += 1
word_before_cursor = document.get_word_before_cursor()
try:
for word in WORDS:
if word.startswith(word_before_cursor):
time.sleep(.2) # Simulate slowness.
yield Completion(word, -len(word_before_cursor))
finally:
# We use try/finally because this generator can be closed if the
# input text changes before all completions are generated.
self.loading -= 1
def main():
# We wrap it in a ThreadedCompleter, to make sure it runs in a different
# thread. That way, we don't block the UI while running the completions.
slow_completer = SlowCompleter()
# Add a bottom toolbar that display when completions are loading.
def bottom_toolbar():
return ' Loading completions... ' if slow_completer.loading > 0 else ''
# Display prompt.
text = prompt('Give some animals: ', completer=slow_completer,
complete_in_thread=True, complete_while_typing=True,
bottom_toolbar=bottom_toolbar,
complete_style=CompleteStyle.MULTI_COLUMN)
print('You said: %s' % text)
if __name__ == '__main__':
main()
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