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IRB type completion comes as a result of a chain of events which starts from the incredible work done by Kevin Newton (et al) to write a new canonical Ruby parser called Prism in C99 with no dependencies [1].
With Prism, you can then create tool suites like syntax_tree [2], which then leads Prettier formatters [3], a new Ruby LSP [4], which unlocks a new Ruby LSP VS Code extension [5], not to mention a laundry list of other gems like Rubocop and of course Ruby itself that will benefit from a faster and more maintainable Ruby parser.
It's a beautiful illustration of the power of questioning conventions, going back to first principles to uncover better solutions to previously solved problems, whose new solutions create new capabilities which unlocks the ability to solve new problems.
[1]: https://github.com/ruby/prism
Reading "big features" like "multi line input" makes me feel more than ever that we really need an ultra light weight embeddedable text editor.
I wrote one, and while it's not yet complete I can say it's really _not that hard_
https://github.com/civboot/civlua/blob/main/ele/README.md
This allows you to use fzf with IRB. It works with anything that uses readline, which IRB uses. https://github.com/lincheney/rl_custom_isearch
it works for me on linux, not sure about other OS's