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#compdef chown chgrp

local suf usr grp req expl

if [[ CURRENT -eq 2 || CURRENT -eq 3 && $words[CURRENT-1] = -* ]]; then
  if [[ $service = chgrp ]] || compset -P '*[:.]'; then
    if (( EGID && $+commands[groups] )); then  # except for root
      _wanted groups expl 'group' compadd $(groups) && return 0
    fi
    _groups && return 0
  else
    if [[ $OSTYPE = (solaris*|hpux*|*bsd*) ]]; then
      suf=':'
    else
      suf='.'
    fi
    compset -S '.*' && unset suf
    _users -S "$suf" -q && return 0
  fi
else
  if [[ $service = chgrp ]]; then
    grp=${words[CURRENT-1]}
  else
    usr=${words[CURRENT-1]%%[.:]*}
    usr=${${(M)usr:#[0-9]#}:-${userdirs[$usr]:+.$usr.}}
    grp=${${(M)words[CURRENT-1]%%[.:]*}#?}
  fi
  [[ -n $grp ]] && grp="${${(M)grp:#[0-9]#}:-.$grp.}"
  req=( ${usr:+\^u$usr} ${grp:+\^g$grp} )
  (( EUID )) && req=( u$EUID$^req )

  _files -g "*(${(j:,:)req})" && return 0
fi