zsh/Completion/Unix/Command/_ssh

#compdef ssh slogin=ssh scp ssh-add ssh-agent ssh-keygen sftp

_remote_files () {
  # There should be coloring based on all the different ls -F classifiers.
  local expl remfiles remdispf remdispd args suf ret=1

  if zstyle -T ":completion:${curcontext}:" remote-access; then
    zparseopts -D -E -a args p: 1 2 4 6 F:
    remfiles=(${(M)${(f)"$(ssh $args -a -x ${words[CURRENT]%%:*} ls -d1F ${PREFIX%%[^./][^/]#}\* 2>/dev/null)"}%%[^/]#(|/)})
    compset -P '*/'
    compset -S '/*' || suf='remote file'

    remdispf=(${remfiles:#*/})
    remdispd=(${(M)remfiles:#*/})

    _tags files
    while _tags; do
      while _next_label files expl ${suf:-remote directory}; do
        [[ -n $suf ]] && compadd "$@" "$expl[@]" -d remdispf \
	    ${remdispf%[*=@|]} && ret=0 
	compadd ${suf:+-S/} "$@" "$expl[@]" -d remdispd \
	    ${remdispd%/} && ret=0
      done
      (( ret )) || return 0
    done
  else
    _message -e remote-files 'remote file'
  fi
}

_ssh () {
  local curcontext="$curcontext" state line expl common tmp ret=1
  typeset -A opt_args

  common=(
    '-c+[select encryption cipher]:encryption cipher:(idea des 3des blowfish arcfour tss none)'
    '-C[compress data]'
    '-F+[specify alternate config file]:config file:_files'
    '-i+[select identity file]:SSH identity file:_files'
    '*-o+[specify extra options]:option string:->option'
    '(-2)-1[forces ssh to try protocol version 1 only]'
    '(-1)-2[forces ssh to try protocol version 2 only]'
    '(-6)-4[forces ssh to use IPv4 addresses only]'
    '(-4)-6[forces ssh to use IPv6 addresses only]'
  )

  case "$service" in
  ssh)
    _arguments -C -s \
      '(-A)-a[disable forwarding of authentication agent connection]' \
      '(-a)-A[enables forwarding of the authentication agent connection]' \
      '(-P)-b+[specify interface to transmit on]:bind address' \
      '-D+[specify a dynamic port forwarding]:port' \
      '-e+[set escape character]:escape character (or `none'"'"'):' \
      '(-n)-f[go to background]' \
      '-g[allow remote hosts to connect to local forwarded ports]' \
      '-I+[specify smartcard device]:device:_files' \
      '-k[disable forwarding of kerberos tickets]' \
      '-l+[specify login name]:login name:_ssh_users' \
      '(-1)-m+[specify mac algorithms]:mac spec' \
      '-n[redirect stdin from /dev/null]' \
      '(-1)-N[do not execute a remote command. (protocol version 2 only)]' \
      '-p+[specify port on remote host]:port number on remote host' \
      '-P[use non privileged port]' \
      '(-v)*-q[quiet operation]' \
      '(-1)-s[invoke subsystem]' \
      '(-T)-t[force pseudo-tty allocation]' \
      '(-1 -t)-T[disable pseudo-tty allocation (protocol version 2 only)]' \
      '(-q)*-v[verbose mode]' \
      '-V[show version number]' \
      '(-X)-x[disable X11 forwarding]' \
      '(-x)-X[enable X11 forwarding]' \
      '*-L[specify local port forwarding]:local port forwarding:->forward' \
      '*-R[specify remote port forwarding]:remote port forwarding:->forward' \
      ':remote host name:->userhost' \
      '*::args:->command' "$common[@]" && ret=0
    ;;
  scp)
    _arguments -C -s \
      '-p[preserve modification times]' \
      '-r[recursively copy directories]' \
      '-v[verbose mode]' \
      '-B[batch mode]' \
      '-q[disables the progress meter]' \
      '-P+[specify port on remote host]:port number on remote host:' \
      '-S+[specify path to ssh]:path to ssh:_files -g \*\(-\*\)' \
      '*:file:->file' "$common[@]" && ret=0
    ;;
  ssh-add)
    _arguments -s \
      '-l[list all identities]' \
      '-L[lists public key parameters of all identities in the agent]'\
      '-d[remove identity]' \
      '-D[delete all identities]' \
      '-p[read passphrase from stdin]' \
      '*:SSH identity file:_files'
    return
    ;;
  ssh-agent)
    _arguments -s \
      '(*)-k[kill agent automatically]' \
      '(-c)-s[force sh-style shell]' \
      '(-s)-c[force csh-style shell]' \
      '(-k)-d[debug mode]' \
      '*::command: _normal'
    return
    ;;
  ssh-keygen)
    _arguments \
      '(-p -c -u -P)-b[specify number of bits in key]:bits in key:' \
      '(-c)-f[key file]:key file:_files' \
      '(-c -u)-N[specify new passphrase]:new passphrase:' \
      '(-b -u -f)-P[specify old passphrase]:old passphrase:' \
      '(-p -u)-C[specify new comment]:new comment:' \
      '(-b -C -u -c)-p[change passphrase of private key file]' \
      '(-b -N -p -u)-c[change comment in private and public key files]' \
      '-l[show fingerprint of specified private or public key file]' \
      '-q[silence ssh-keygen]' \
      '-R[exit 0 or 1 if RSA support is functional]' \
      '-x[read a DSA private key and print a SSH2 public key to stdout]'\
      '-X[read a SSH2 public key and print a DSA public key to stdout]'\
      '-y[read a DSA private key and print a DSA public key to stdout]'\
      '(-b -N -C -p -c)-u[change key cipher to default]'
    return
    ;;
  sftp)
    _arguments -C -s \
      '-C[compress data]' \
      '-F+[specify alternate config file]:config file:_files' \
      '(-1)-s[invoke subsystem]' \
      '-S+[specify program]:program:_command_names -e' \
      '-b+[specify batch file to read]:batch file:_files' \
      '*-v[verbose mode]' \
      '-1[forces ssh to try protocol version 1 only]' \
      '*-o+[specify extra options]:option string:->option' \
      '1:file:->rfile' '*:file:->file' && ret=0
    ;;
  esac

  while [[ -n "$state" ]]; do
    lstate="$state"
    state=''

    case "$lstate" in
    option)
      if compset -P '*[= ]'; then
        case "$IPREFIX" in
        *(#i)(afstokenpassing|batchmode|compression|fallbacktorsh|forward(agent|x11)|keepalive|passwordauthentication|rhosts(|rsa)authentication|rsaauthentication|usersh|kerberos(authetication|tgtparsing)|useprivileged)*)
	  _wanted values expl 'truth value' compadd yes no && ret=0
          ;;
        *(#i)ciphers*)
          _values -s , 'encryption cipher' \
	      'aes128-cbc' \
	      '3des-cbc' \
	      'blowfish-cbc' \
	      'cast128-cbc' \
	      'arcfour' \
	      'aes192-cbc' \
	      'aes256-cbc' \
	      'rijndael128-cbc' \
	      'rijndael192-cbc' \
	      'rijndael256-cbc' \
	      'rijndael-cbc@lysator.liu.se' && ret=0
          ;;
        *(#i)cipher*)
	  _wanted values expl 'encryption cipher' \
              compadd idea des 3des blowfish arcfour tss none && ret=0
          ;;
        *(#i)globalknownhostsfile*)
          _description files expl 'global file with known hosts'
          _files "$expl[@]" && ret=0
          ;;
        *(#i)hostname*)
	  _wanted hosts expl 'real host name to log into' _ssh_hosts && ret=0
          ;;
        *(#i)identityfile*)
          _description files expl 'SSH identity file'
          _files "$expl[@]" && ret=0
          ;;
        *(#i)(local|remote)forward*)
          state=forward
          ;;
        *(#i)protocol*)
          _values -s , 'protocol version' \
	      '1' \
	      '2' && ret=0
	  ;;
        *(#i)proxycommand*)
          compset -q
          shift 1 words
          (( CURRENT-- ))
          _normal && ret=0
          ;;
        *(#i)stricthostkeychecking*)
          _wanted values expl 'checking type' compadd yes no ask && ret=0
          ;;
        *(#i)userknownhostsfile*)
          _description files expl 'user file with known hosts'
          _files "$expl[@]" && ret=0
          ;;
        *(#i)user*)
	  _wanted users expl 'user to log in as' _ssh_users && ret=0
          ;;
        *(#i)xauthlocation*)
          _description files expl 'xauth program'
          _files "$expl[@]" -g '*(-*)' && ret=0
          ;;
        esac
      else
        _wanted values expl 'configure file option' \
            compadd -M 'm:{a-z}={A-Z}' -S '=' - \
                AFSTokenPassing BatchMode BindAddress CheckHostIP \
		Cipher Ciphers ClearAllForwardings Compression \
                CompressionLevel ConnectionAttempts DynamicForward \
		EscapeChar FallBackToRsh ForwardAgent ForwardX11 \
                GatewayPorts GlobalKnownHostsFile HostbasedAuthentication \
		HostKeyAlgorithms HostKeyAlias HostName IdentityFile \
		KeepAlive KerberosAuthentication KerberosTgtPassing \
		LocalForward LogLevel MACs NoHostAuthenticationForLocalhost \
		NumberOfPasswordPrompts PreferredAuthentications \
		PasswordAuthentication Port Protocol ProtocolKeepAlives \
                ProxyCommand PubkeyAuthentication RemoteForward \
		RhostsAuthentication RhostsRSAAuthentication \
		RSAAuthentication ChallengeResponseAuthentication \
		SetupTimeOut SmartcardDevice StrictHostKeyChecking \
                UsePrivilegedPort User UserKnownHostsFile UseRsh \
                XAuthLocation && ret=0
      fi
      ;;
    forward)
      if compset -P 1 '*:'; then
        if compset -P '*:'; then
          _message -e port-numbers 'port number'
        else
	  _wanted hosts expl host _ssh_hosts -qS:
        fi
      else
        _message -e port-numbers 'listen-port number'
      fi
      return
      ;;
    command)
      shift 1 words
      (( CURRENT-- ))
      _normal
      return
      ;;
    userhost)
      if compset -P '*@'; then
	_wanted hosts expl 'remote host name' _ssh_hosts && ret=0
      elif compset -S '@*'; then
        _wanted users expl 'login name' _ssh_users -S '' && ret=0
      else
        if (( $+opt_args[-l] )); then
	  tmp=()
	else
	  tmp=( 'users:login name:_ssh_users -qS@' )
	fi
	_alternative \
	    'hosts:remote host name:_ssh_hosts' \
	    "$tmp[@]" && ret=0
      fi
      ;;
    file)
      if compset -P '*:'; then
        _remote_files ${(kv)~opt_args[(I)-[FP1246]]/-P/-p} && ret=0
      elif compset -P '*@'; then
        _wanted hosts expl host _ssh_hosts -S: && ret=0
      else
        _alternative \
	    'files:: _files' \
	    'hosts:host:_ssh_hosts -S:' \
	    'users:user:_ssh_users -qS@' && ret=0
      fi
      ;;
    rfile)
      if compset -P '*:'; then
        _remote_files && ret=0
      elif compset -P '*@'; then
        _wanted hosts expl host _ssh_hosts -S: && ret=0
      else
        _alternative \
	    'hosts:host:_ssh_hosts -S:' \
	    'users:user:_ssh_users -qS@' && ret=0
      fi
      ;;
    esac
  done
}

_ssh_users () {
  _combination -s '[:@]' my-accounts users-hosts users "$@"
}

_ssh_hosts () {
  if [[ "$IPREFIX" == *@ ]]; then
    _combination -s '[:@]' my-accounts users-hosts "users=${IPREFIX/@}" hosts "$@"
  else
    _combination -s '[:@]' my-accounts users-hosts \
      ${opt_args[-l]:+"users=${opt_args[-l]:q}"} hosts "$@"
  fi
}

_ssh "$@"