prezto_config/plugins/gas/_gas

#compdef gas
#autoload

local curcontext="$curcontext" state line cmds ret=1

_arguments -C \
  '(- 1 *)'{-v,--version}'[display version information]' \
  '(-h|--help)'{-h,--help}'[show help information]' \
  '1: :->cmds' \
  '*: :->args' && ret=0

case "$state" in
  (cmds)
    cmds=(
      "version:Prints Gas's version"
      "use:Uses author"
      "show:Shows your current user"
      "list:Lists your authors"
      "import:Imports current user to gasconfig"
      "help:Describe available tasks or one specific task"
      "delete:Deletes author"
      "add:Adds author to gasconfig"
    )
    _describe -t commands 'gas command' cmds && ret=0
  ;;
  (args)
    case "$line[1]" in
      (use|delete)
        _values -S , 'authors' $(cat ~/.gas | sed -n -e 's/^\[\(.*\)\]/\1/p') && ret=0
      ;;
    esac
  ;;
esac

return ret