%prep
  PAGER=cat
  unalias run-help
  autoload +X -Uz ${^fpath}/run-help*(N)
  builtin() {
    case "$1 $2" in
      ( 'getln cmd_args' )
        cmd_args="$BUFFER_STACK"
      ;;
      ( 'print -z' )
      ;;
      ( 'whence -va' )
        print -l "$3 is WHENCE:{$3}"
      ;;
      ( * )
        eval $@
      ;;
    esac
  }
  man() {
    [[ $1 == -w && -n $NO_SUBCMD_MANUALS ]] &&
        return 1
    print "MAN:{${(qq)@}}"
  }
  git svn () {
    print "${(U)0}:{${(qq)@}}"
  }


%test

  BUFFER_STACK='btrfs --help'
  run-help btrfs
0:btrfs with option flag, no subcmd
>btrfs is WHENCE:{btrfs}
>MAN:{'btrfs'}

  BUFFER_STACK='btrfs subvolume snapshot –r /btrfs/SV1 /btrfs/SV1-rosnap'
  run-help btrfs
0:btrfs with subcmd
>btrfs is WHENCE:{btrfs}
>MAN:{'btrfs-subvolume'}

  BUFFER_STACK="sudo $BUFFER_STACK"
  run-help btrfs
0:sudo btrfs with subcmd
>btrfs is WHENCE:{btrfs}
>MAN:{'btrfs-subvolume'}

  BUFFER_STACK='ip addr add 192.168.50.5 dev eth1'
  run-help ip
0:ip with subcmd
>ip is WHENCE:{ip}
>MAN:{'ip-address'}

  NO_SUBCMD_MANUALS=1
  run-help ip
  unset NO_SUBCMD_MANUALS
0:ip with subcmd, but no subcmd manuals
>ip is WHENCE:{ip}
>MAN:{'ip'}

  BUFFER_STACK='ip -s -s link ls up'
  run-help ip
0:ip with options and subcmd
>ip is WHENCE:{ip}
>MAN:{'ip-link'}

  BUFFER_STACK="sudo $BUFFER_STACK"
  run-help ip
0:sudo ip with options and subcmd
>ip is WHENCE:{ip}
>MAN:{'ip-link'}

  BUFFER_STACK='svn -vq'
  run-help svn
0:svn with options
>svn is WHENCE:{svn}
>SVN:{'help'}

  BUFFER_STACK+=' commit -m "log messages"'
  run-help svn
0:svn with options and subcmd
>svn is WHENCE:{svn}
>SVN:{'help' 'commit'}

  BUFFER_STACK='git --exec-path'
  run-help git
0:git with option
>git is WHENCE:{git}
>GIT:{'help' 'git'}

  BUFFER_STACK='git -C $PWD/.. difftool --no-prompt --tool opendiff --dir-diff'
  run-help git
0:git with option, file & subcmd
>git is WHENCE:{git}
>GIT:{'help' 'difftool'}

  BUFFER_STACK='git -c http.proxy=someproxy clone https://github.com/user/repo.git'
  run-help git
0:git with option, assignment & subcmd
>git is WHENCE:{git}
>GIT:{'help' 'clone'}


%clean