zsh-workers

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 #compdef chsh chpass
case $OSTYPE in
(darwin*)
  _arguments : \
      '-s[specify user login shell]:shell:(${(Z+Cn+)"$(</etc/shells)"})' \
      "-l[specify location of user]:node:" \
      "-u[specify authentication name]:auth user:" \
      "1:user name:_users"
  ;;
(*bsd*|dragonfly*)
  # options common to most BSD flavors
  _arguments : \
      '(-a)-s[specify user login shell]:shell:(${(Z+Cn+)"$(</etc/shells)"})' \
      '(-s)-a[passwd file entry]:colon-separated list:' \
      '(-y)-l[change local password database]' \
      '(-l)-y[change YP(NIS) password database]' \
      '1:user name:_users'
  ;;
(linux-gnu)
  if { =chsh -v } >&/dev/null
  then
      local -a opts shells
      shells=( $(=chsh -l) )
      _arguments : \
	  "(-)-s[specify your login shell]:shell:($shells)" \
	  "(-)--shell[specify your login shell]:shell:($shells)" \
	  "(-)-l[print shells in /etc/shells]" \
	  "(-)--list-shells[print shells in /etc/shells]" \
	  "(-)-u[print a usage message and exit]" \
	  "(-)--help[print a usage message and exit]" \
	  "(-)-v[print version information and exit]" \
	  "(-)--version[print version information and exit]" \
	  "1:user name:_users"
      return
  fi
  # else fall through
  ;&
(*)
  local s=''
  # Use $s to cause all options to be treated as mutually exclusive
  [[ $words[CURRENT-1] = -* ]] && s="(-)$words[CURRENT-1]"
  # This fiddling with $s is a hack to cause "_arguments  : --" to use
  # the /etc/shells listing for -s or --shell even when the description
  # of that option has been pulled from the GNU --help output.
  [[ $words[CURRENT-1] = (-s|--shell) ]] &&
    s="$s"'[ ]:shell:(${(Z+Cn+)"$(</etc/shells)"})'
  _arguments : $s "1:user name:_users" --
  ;;
esac