completer 函数的使用

completer 函数将用户输入的当前行作为参数，并返回包含 2 个条目的 Array：

• 使用匹配条目的 Array 补全。
• 用于匹配的子字符串。

例如：[[substr1, substr2, ...], originalsubstring]。

function completer(line) {
  const completions = '.help .error .exit .quit .q'.split(' ');
  const hits = completions.filter((c) => c.startsWith(line));
  // 如果没有找到，则显示所有补全
  return [hits.length ? hits : completions, line];
}

completer 函数也可以返回 <Promise>，或者是异步的：

async function completer(linePartial) {
  await someAsyncWork();
  return [['123'], linePartial];
}

The completer function takes the current line entered by the user as an argument, and returns an Array with 2 entries:

• An Array with matching entries for the completion.
• The substring that was used for the matching.

For instance: [[substr1, substr2, ...], originalsubstring].

function completer(line) {
  const completions = '.help .error .exit .quit .q'.split(' ');
  const hits = completions.filter((c) => c.startsWith(line));
  // Show all completions if none found
  return [hits.length ? hits : completions, line];
}

The completer function can also returns a <Promise>, or be asynchronous:

async function completer(linePartial) {
  await someAsyncWork();
  return [['123'], linePartial];
}