RawLine

RawLine was created to provide a 100% Ruby alternative to the ReadLine library, providing some of its most popular features such as:

• Basic line editing operations

• Word completion

• History Management

• Custom key/key sequences bindings

Installation

The simplest method to install RawLine is to install the gem:

gem install rawline

Usage

Editor initialization:

require 'rawline'
editor = RawLine::Editor.new

Key binding:

editor.bind(:ctrl_z) { editor.undo }
editor.bind(:up_arrow) { editor.history_back }
editor.bind(:ctrl_x) { puts "Exiting..."; exit }

Setup word completion

editor.completion_proc = lambda do |word|
  if word
    ['select', 'update', 'delete', 'debug', 'destroy'].find_all  { |e| e.match(/^#{Regexp.escape(word)}/) }
  end
end
editor.completion_append_string = " "

Read input:

editor.read("=> ", true)

Replacing Readline

Simply include the RawLine (or Rawline) module:

include Rawline

…and you’ll get:

readline(prompt, add_history) # RawLine::Editor#read(prompt, add_history)
HISTORY  # RawLine::Editor#history
FILENAME_COMPLETION_PROC  # Rawline::Editor#filename_completion_proc
...

but also:

Rawline.editor  # RawLine::Editor

…which opens a world of endless possibilities! ;-)