Irb::Autosuggestions

No need to explain. Fish-like autosuggestions for IRB — ghost text from history as you type.

Contents

• Irb::Autosuggestions
  • Contents
  • Installation
  • Usage
    • How it works
  • Development
  • License

Installation

Add to your Gemfile:

gem 'irb-autosuggestions'

~/.irbrc:

require 'irb-autosuggestions'

Usage

Start typing in IRB. Gray ghost text appears after the cursor, showing the most recent matching history entry:

irb(main):001* [1,2,3].map do |el|
irb(main):002*   el.succ      <- "cc" in gray
irb(main):003> end            <- "d" in gray

Press right arrow (->) to accept the full multiline suggestion.

How it works

• Each keystroke queries Reline::HISTORY for the most recent entry whose prefix matches the current buffer.
• The suggestion is rendered inline as gray (\e[90m) text without modifying the buffer.
• Extra ghost lines (for multiline history entries) are drawn below the prompt.
• \e[J clears stale ghost artifacts from the viewport.
• Right arrow triggers ed_next_char, which replaces the buffer with the ghost text.

Development

bin/setup
bundle exec rake          # spec + rubocop

License

MIT