cocでLSP互換の補完を実装する

例えばcoc-copilotでこんな感じにする

code:typescript

import {

CancellationToken,

CompletionContext,

CompletionItem,

CompletionItemProvider,

ExtensionContext,

languages,

Position,

TextDocument,

} from 'coc.nvim';

export async function activate(context: ExtensionContext): Promise<void> {

context.subscriptions.push(

languages.registerCompletionItemProvider('copilot', 'Copilot', null, new CopilotCompletionItemProvider())

);

}

class CopilotCompletionItemProvider implements CompletionItemProvider {

async provideCompletionItems(

document: TextDocument,

position: Position,

token: CancellationToken,

context: CompletionContext

) {

const completionItems: CompletionItem[] = [];

// const buffer = (await workspace.document).buffer;

// const copilot = (await buffer.getVar('_copilot')) as Copilot | null;

// if (copilot?.suggestions == null) return completionItems;

completionItems.push({

label: 'sample',

// ---- add more property! ----

});

return completionItems;

}

// 補完候補選択時に item をゴニョゴニョしたい、もしくはする必要がある場合

resolveCompletionItem(item: CompletionItem, token: CancellationToken) {

return item;

}

}