Built-in generation of bash completions

[carnesen]

Now that we have come so far with the autocomplete functionality for CliRepl, it would be awesome if we leverage that command completion for Node.js CLIs executed in bash.

We could offer a CLI command to get these autocompletions into a shell that would look something like (for a CLI my-cli):

completionsCommand = CliCommand({
  name: 'completions',
  action() {
    return `
# This command is meant to be used as "eval $(my-cli completions)"
command -W ...
`

The user would do:

$ eval $(my-cli completions)

https://www.gnu.org/software/bash/manual/html_node/Programmable-Completion.html
Personally I still use bash, but probably we could/should do this for other shells too.