#compdef -command-

# The option `-e' if given as the first argument says that we should
# complete only external commands and executable files. This and a
# `-' as the first argument is then removed from the arguments.

local args defs

defs=(
  'commands:external command:compadd - ${(@k)commands}'
  'executables:executable file or directory:_path_files -/g \*\(-\*\)'
)

if [[ "$1" = -e ]]; then
  shift
else
  [[ "$1" = - ]] && shift

  defs=( "$defs[@]"
    'builtins:builtin command:compadd - ${(@k)builtins}'
    'functions:shell function:compadd - ${(@k)functions}'
    'aliases:alias:compadd - ${(@k)aliases}'
    'reserved-words:reserved word:compadd - ${(@k)reswords}'
    'jobs:: _jobs -t'
    'parameters:: _parameters -qS= -r "\n\t\- =["'
  )
fi

args=( "$@" )

_alternative -O args "$defs[@]"