#compdef chmod gchmod zf_chmod

local curcontext="$curcontext" state line expl ret=1 variant
local -a args privs aopts=( -A '-*' )

args=( '*: :->files' '1: :_file_modes' )

_pick_variant -r variant -b zsh gnu=Free\ Soft $OSTYPE --version
case "$variant" in
  zsh)
    # Assign, not append because zf_chmod only supports octal modes.
    args=(
      '-R[change files and directories recursively]'
      '-s[enable paranoid behavior]'
      '1: :_guard "[0-7]#" "octal mode"'
      '*: :->files'
    )
    ;;
  gnu)
    aopts=()
    args+=(
      '(-v --verbose -c --changes)'{-c,--changes}'[report changes made]'
      '(-v --verbose -c --changes)'{-v,--verbose}'[output a diagnostic for every file processed]'
      '(-f --silent --quiet)'{-f,--silent,--quiet}'[suppress most error messages]'
      '(--no-preserve-root)--preserve-root[fail to operate recursively on /]'
      "(--preserve-root)--no-preserve-root[don't treat / specially (default)]"
      '(1)--reference=[copy permissions of specified file]:file:_files'
      '(-R --recursive)'{-R,--recursive}'[change files and directories recursively]'
      '(- : *)--help[display help information]'
      '(- : *)--version[display version information]'
    )
    ;;
  *)
    args+=(
      '-f[suppress most error messages]'
      '-R[change files and directories recursively]'
    )
    ;|
  freebsd*|dragonfly*|darwin*)
    args+=(
      '-v[output a diagnostic for every file processed]'
    )
    ;|
  freebsd*|netbsd*|darwin*|dragonfly*)
    args+=(
      '-h[operate on symlinks themselves]'
    )
    ;|
  freebsd*|openbsd*|netbsd*|darwin*|dragonfly*)
    args+=(
      '(-H -L -P)-L[follow all symlinks]'
      '(-H -L -P)-H[follow symlinks on the command line]'
      '(-H -L -P)-P[do not follow symlinks (default)]'
    )
    ;|
  darwin*)
    args+=(
      '(1)-C[return false if any specified files have ACLs]'
      '(1)-N[remove ACLs from specified files]'
      '(1)-E[read ACL info from stdin as sequential list of ACEs]'
      "(1)-i[remove inherited bit from all entries in specified files' ACLs]"
      "(1)-I[remove all inherited entries from specified files' ACLs]"
    )
    ;;
esac

_arguments -C -s -S $aopts "$args[@]" && ret=0

case "$state" in
  files)
    if [[ -n $opt_args[--reference] ]]; then
      zmodload -F zsh/stat b:zstat 2>/dev/null
      typeset -i8 ref=$(zstat +mode $opt_args[--reference])
      _wanted files expl file _files -g "*(-.^f${ref#??})" && ret=0
    elif [[ $line[1] = [0-7]## ]]; then
      _wanted files expl file _files -g "*(-.^f$line[1])" && ret=0
    else
      local spec who op priv
      local -a specs
      for spec in ${(s:,:)line[1]}; do
        if [[ ${spec#*[+-=]} != [rwxst]## ]]; then
          _files && ret=0
          return ret
        fi

        specs+=( ${${(M)spec##[+-=]*}:+a}$spec )
      done
      _wanted files expl file _files -g "*(-.^f:${(j.,.)specs}:)" && ret=0
    fi
  ;;
esac

return ret