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from typing import Iterable, Set
from prompt_toolkit.document import Document
from .base import CompleteEvent, Completer, Completion
__all__ = ["DeduplicateCompleter"]
class DeduplicateCompleter(Completer):
"""
Wrapper around a completer that removes duplicates. Only the first unique
completions are kept.
Completions are considered to be a duplicate if they result in the same
document text when they would be applied.
"""
def __init__(self, completer: Completer) -> None:
self.completer = completer
def get_completions(
self, document: Document, complete_event: CompleteEvent
) -> Iterable[Completion]:
# Keep track of the document strings we'd get after applying any completion.
found_so_far: Set[str] = set()
for completion in self.completer.get_completions(document, complete_event):
text_if_applied = (
document.text[: document.cursor_position + completion.start_position]
+ completion.text
+ document.text[document.cursor_position :]
)
if text_if_applied == document.text:
# Don't include completions that don't have any effect at all.
continue
if text_if_applied in found_so_far:
continue
found_so_far.add(text_if_applied)
yield completion
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