autocompletion.py

#!/usr/bin/env python
import sys
from prompt_toolkit import prompt
from prompt_toolkit.completion import WordCompleter
from prompt_toolkit.contrib.regular_languages.compiler import compile
from prompt_toolkit.lexers import Lexer, PygmentsLexer, SimpleLexer
from prompt_toolkit.contrib.regular_languages.completion import GrammarCompleter
from prompt_toolkit.contrib.regular_languages.lexer import GrammarLexer

animal_completer = WordCompleter(
    [
        "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",
    ],
    ignore_case=True,
)


class MyCompleter(WordCompleter):
    def get_completions(self, document, event):
        print(document, file=sys.stderr)
        yield from super().get_completions(document, event)


grammar = compile(r"(?P<foo>\w+) (?P<bar>\d+)")
lexer = GrammarLexer(grammar, lexers={"foo": SimpleLexer(), "bar": SimpleLexer()})
completer = GrammarCompleter(grammar, {"foo": animal_completer, "bar": MyCompleter(["123"])})


def main():
    text = prompt(
        "Input a word then numbers:",
        complete_while_typing=True,
        lexer=lexer,
        completer=completer,
    )
    print("You said: %s" % text)


if __name__ == "__main__":
    main()

Try to get the whole line from completers.

run:

python autocompletion.py 2>error.log

see logs:

tail -f error.log