I think I solved the tab-complete on a full line part

[rubyFeedback]

Here is the code:

require 'reline'

alias e puts

prompt = '> '

SHALL_HISTORY_BE_USED = true

STATIC_LIST = [
  'search1',
  'Search2',
  'abc def',
  'download',
  'open',
  'help',
  'history',
  'quit',
  'url',
  'next',
  'clear',
  'prev',
  'past',
  'search for cat',
  'z is the cat',
  'Z is the dog'
].sort

Reline.completer_word_break_characters = "" # Pass whole line to proc each time
Reline.completion_append_character = ' '
Reline.completion_case_fold = true

Reline.completion_proc = proc { |entry|
  (STATIC_LIST+Dir['*']).flatten.grep(/^#{Regexp.escape(entry)}/)
}

begin
  loop {
    user_input = Reline.readline(prompt, SHALL_HISTORY_BE_USED)
    e "The user input was:\n#{user_input}"
    p Reline::HISTORY.to_a
    case user_input
    when 'dir'
      pp (STATIC_LIST+Dir['*']).flatten # Show our listing.
    when 'q','quit','break','exit'
      break
    end
  }
rescue Interrupt
  exit 0
end

I adapted it from:

https://stackoverflow.com/questions/13876024/how-to-write-a-ruby-command-line-app-that-supports-tab-completion

Just in the case someone else needs it and may not find it on stackoverflow.

I am not 100% done but I think I have the basic part now, so I can add e. g. dynamic listing of files and
directories in the current working directory, and a basic list of commands I can support with that.