async-autocomplete-cli

async-autocomplete-cli

A CLI prompt that allows the user to select from a list of choices, where the choices are fetched asynchronously (e.g. from a request to a remote server). The user can type filter text and new choices matching that filter text will be fetched.

Based upon prompts; this basically a stripped-down fork of that repo.

Usage Example

npm i --save async-autocomplete-cli

const { asyncAutocomplete } = require('async-autocomplete-cli')

async function go() {
  const instance = await asyncAutocomplete({
    message: 'Select an AWS EC2 Instance',
    suggest: async (input, cancelationToken, yield) => {
      const results = []
      if (!input) {
        // getRecentSelectedInstances not implemented in this example.
        results.push(...(await getRecentSelectedInstances()))
        yield(results)
      }

      const Filters = []
      if (input)
        Filters.push({
          Name: 'tag:Name',
          Values: [`*${input}*`],
        })
      const args = { MaxResults: 100 }
      if (Filters.length) args.Filters = Filters
      const request = ec2.describeInstances(args)
      cancelationToken.on('canceled', () => request.abort())

      if (cancelationToken.canceled) return []

      const { Reservations } = await request.promise()
      for (const { Instances } of Reservations || []) {
        for (const Instance of Instances || []) {
          const { InstanceId, Tags = [] } = Instance
          const name = (Tags.find(t => t.Key === 'Name') || {}).Value
          results.push({
            title: `${InstanceId} ${name || ''}`,
            value: Instance,
            initial: !results.length,
          })
        }
      }

      if (!results.length) {
        results.push({
          title: `No matching EC2 Instances found${
            input ? ` with name starting with ${input}` : ''
          }`,
        })
      }

      return results
    },
  })
}

go()

API

asyncAutocomplete(options)

The suggest function will be called with:

• The user input (a string, may be empty)
• A cancelationToken. This is an EventEmitter that will event 'canceled' when the user input has changed. It also has a canceled property that is initially false and becomes true when the user input has changed. You must handle the 'canceled' event if you want choices for the latest user input to load ASAP.
• A yield function you can call with an array of choices objects [{ title, value }, ...]. You can also return the final choices, but calling this function allows you to change the choices even if the user input remains the same. For example, you might want to save what the user has recently selected to a local file, and show the recent selections immediately while waiting to load other choices from the server.

Options

Param	Type	Description
message	string	Prompt message to display
suggest	function	Function to fetch choices
limit	number	Max number of results to show. Defaults to 10
style	string	Render style (default, password, invisible, emoji). Defaults to 'default'
clearFirst	boolean	The first ESCAPE keypress will clear the input