An example of simple language server using pygls

hfcc_poc.py

#!/usr/bin/python3

from pygls.server import LanguageServer
from lsprotocol.types import (
    TEXT_DOCUMENT_COMPLETION,
    CompletionItemKind,
    CompletionItem,
    CompletionList,
    CompletionParams,
)

server = LanguageServer("example-server", "v0.1")

@server.feature(TEXT_DOCUMENT_COMPLETION)
def completions(params: CompletionParams):
    items = []
    document = server.workspace.get_document(params.text_document.uri)
    current_line = document.lines[params.position.line].strip()

    if "hel" in current_line:
        items = [
            CompletionItem("Test completion from the imaginery star* model", kind=CompletionItemKind.Snippet),
        ]

    return CompletionList(is_incomplete=False, items=items)


server.start_io()