Command and arguments completion with readline.

completion.rb

COMMANDS = {
  'collect' => ['info', 'info2'], 
  'watch' => ['watchvalue_1', 'watchvalue_2']
}

comp = proc do |s| 
	if Readline.line_buffer =~ /#{COMMANDS.keys} /
		COMMANDS.values_at("#{Readline.line_buffer.gsub(/ .*/,'')}").flatten.grep(/^#{Regexp.escape(s)}/)
	else
		COMMANDS.keys.grep(/^#{Regexp.escape(s)}/)
	end
end

Readline.completion_proc = comp