output.txt

#type "a", "b", "c", "Enter", "a", "TAB":

% crystal test.cr
> abc
you typed: abc
> a
autocompleting on: "a"
line_buffer is: "abc\n"

readline_buffer.cr

# sample code for showing Readline.line_buffer is not updated realtime

require "readline"

Readline.autocomplete do |text|
  print! "\nautocompleting on: #{text.inspect}\n"
  print! "line_buffer is: #{Readline.line_buffer.inspect}\n"
  [] of String
end

loop do
  input = Readline.readline("> ")
  print! "you typed: #{input}\n" unless input.nil?
end