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#compdef iconv

local expl curcontext="$curcontext" state line codeset LOCPATH

(( $+_is_gnu )) || typeset -gA _is_gnu
if (( ! $+_is_gnu[$words[1]] )); then
  if [[ $(_call version $words[1] --version </dev/null 2>/dev/null) = *GNU* ]]; 
  then
    _is_gnu[$words[1]]=yes
  else
    _is_gnu[$words[1]]=
  fi
fi

if [[ -n "$_is_gnu[$words[1]]" ]]; then

  _arguments -C \
    {'(--from-code --list)-f','(-f --list)--from-code='}'[specify code set of input file]:code set:->codeset' \
    {'(--to-code --list)-t','(-t --list)--to-code='}'[specify code set for output]:code set:->codeset' \
    '--list[list all character code sets]' \
    '--verbose[print progress information]' \
    {'(--help)-\?','(-\?)--help'}'[display help information]' \
    '--usage[display a short usage message]' \
    {'(--version)-V','(-V)--version'}'[print program version]' \
    '1:file:_files' && return 0
    
    if [[ $state = codeset ]]; then
      _wanted codesets expl 'code set' \
          compadd "$@" ${${(s:,:)$(iconv --list|sed -n '/^$/,$ p')}## #}
    fi
    
else

  _arguments -C \
    '-f[specify code set of input file]:code set:->codeset' \
    '-t[specify code set for output]:code set:->codeset' \
    '1:file:_files' && return 0

    if [[ $state = codeset ]]; then
      if [[ -f /usr/lib/iconv/iconv_data ]]; then  # IRIX & Solaris
	codeset=( ${${(f)"$(</usr/lib/iconv/iconv_data)"}%%[[:blank:]]*} )
      elif [[ -d ${LOCPATH:=/usr/lib/nls/loc}/iconv ]]; then  # OSF
	codeset=( $LOCPATH/iconv/*(N:t) )
	codeset=( ${(j:_:s:_:)codeset} )
      else
	return 1
      fi
	
      _wanted codesets expl 'code set' compadd "$@" -a codeset
    fi

fi