function __fish_ruby-build_needs_command
  set cmd (commandline -opc)
  if [ (count $cmd) -eq 1 ]
    return 0
  end
  return 1
end

function __fish_ruby-build_definitions
  ruby-build --definitions
end

complete -f -c ruby-build -n '__fish_ruby-build_needs_command' -a '(__fish_ruby-build_definitions)' -d 'Definition'

complete -f -c ruby-build -n '__fish_ruby-build_needs_command' -l keep -s k -d 'Do not remove source tree after installation'
complete -f -c ruby-build -n '__fish_ruby-build_needs_command' -l verbose -s v -d 'Verbose mode: print compilation status to stdout'
complete -f -c ruby-build -n '__fish_ruby-build_needs_command' -l definitions -d 'List all built-in definitions'

complete -f -c ruby-build -n '__fish_ruby-build_needs_command' -l help -s h -d 'Display help information'