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#compdef iconv

local expl curcontext="$curcontext" state line ret=1

if _pick_variant libiconv='GNU*libiconv' glibc='(GNU*libc|EGLIBC)' unix --version; then
  local -a args
  local exargs="-l --list -? --help --usage --version -V"

  args=(
    "(-f --from-code $exargs)"{-f+,--from-code=}'[specify code set of input file]:code set:->from_codeset'
    "(-t --to-code $exargs)"{-t+,--to-code=}'[specify code set for output]:code set:->to_codeset'
    '(- 1 -l --list)'{-l,--list}'[list all character code sets]'
    "($exargs)-c[omit invalid characters from output]"
    "(-s --silent --verbose $exargs)"{-s,--silent}'[suppress warnings]'
    '(-)'{-\?,--help}'[display help information]'
    '(-)--usage[display a short usage message]'
    '(-)'{-V,--version}'[print program version]'
    '1:input file:_files' 
  )

  case $_cmd_variant[$service] in
    (libiconv)
      args=( ${(R)args:#(|\*)(|\(*\))-[V\?]*} )  # remove -V and -?
      args+=(
       '--byte-subst=[format for unconvertible bytes]:format string:'
       '--widechar-subst=[format for unconvertible wide chars]:format string:'
       '--unicode-subst=[format for unconvertible Unicode chars]:format string:'
      )
      ;;
    (glibc)
      args+=( 
        "(-o --output $exargs)"{-o+,--output=}'[specify output file]:output file:_files'
        "(-s --silent $exargs)--verbose[print progress information]"
      )
      ;;
  esac

  _arguments -C -S -s : $args && return 0

  if [[ $state = *_codeset ]]; then
    # suffix is meaningfull only for output encoding
    if [[ $state = to_codeset ]] && compset -P '*[^/]/'; then
      _wanted suffix expl suffix compadd "$@" /TRANSLIT /IGNORE && ret=0
    else
      _wanted codesets expl 'code set' compadd "$@" \
        -M 'm:{a-zA-Z}={A-Za-z} r:|-=* r:|=*' \
        ${$(_call_program codesets iconv --list)%//} && ret=0
    fi
  fi

  return ret

else
  local LOCPATH="${LOCPATH:-/usr/lib/nls/loc}"
  local -U codeset

  _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:]]*} )
      codeset+=( /usr/lib/iconv/*%*.so(Ne.'reply=( ${${REPLY:t}%%%*} ${${REPLY:r}#*%} )'.) )
    elif [[ -d $LOCPATH/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