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#compdef ptx

local -a specs optA

# common specs
specs=(
  '(hv -b --break-file)'{-b+,--break-file=}'[use characters in specified file as word separators]:break file:_files'
  '(hv -f --ignore-case)'{-f,--ignore-case}'[fold lower case to upper case for sorting]'
  '(hv -g --gap-size)'{-g+,--gap-size=}'[specify gap size between output fields]:number of chars [3]: '
  '(hv -i --ignore-file)'{-i+,--ignore-file=}'[ignore keywords listed in specified file]:ignore file:_files'
  '(hv -o --only-file)'{-o+,--only-file=}'[use only the keywords listed in specified file]:only file:_files'
  '(hv -r --references)'{-r,--references}'[first field of each line is a reference]'
  '(hv -w --width)'{-w+,--width=}'[specify page width, reference excluded]:number of characters [72]: '
)

if _pick_variant gnu=GNU unix --version; then
  # GNU coreutils 8.32
  specs+=(
    '(hv -A --auto-reference)'{-A,--auto-reference}'[output automatically generated references]'
    '(hv -G --traditional)'{-G,--traditional}"[behave more like System V 'ptx']"
    '(hv -F --flag-truncation)'{-F+,--flag-truncation=}'[specify string for flagging line truncations]:string [/]: '
    '(hv -M --macro-name)'{-M+,--macro-name=}"[specify macro name to use instead of 'xx']:macro name: "
    '(hv)-O[generate output as roff directives]'
    '(hv -R --right-side-refs)'{-R,--right-side-refs}'[put references at right, not counted in -w]'
    '(hv -S --sentence-regexp)'{-S+,--sentence-regexp=}'[specify regexp for end of lines/sentences]:regexp: '
    '(hv)-T[generate output as TeX directives]'
    '(hv -W --word-regexp -b --break-file)'{-W+,--word-regexp=}'[specify regexp to match each keyword]:regexp: '
    '(hv)--format=[specify the output format]:format:(roff tex)'
    !{-t,--typeset-mode}'[not implemented]'
    + hv
    '(: * -)--help[display help and exit]'
    '(: * -)--version[output version information and exit]'
  )
  if (( $words[(I)(-G|--traditional)] )); then
    specs+=( + arg '1:input file:_files'  '2:output file:_files' )
  else
    specs+=( + arg '(-G --traditional)*:input file:_files' )
  fi
else
  # The only non-GNU implementation I can find is the one in
  # heirloom-doctools. FreeBSD has a package for this.
  specs=( ${specs:#(|*\))--*} )    # remove long options
  # remove '+' from -b+ -g+ -i+ -o+ -w+
  local MATCH MBEGIN MEND
  specs=( ${specs/(#m)-[bgiow]+/$MATCH[1,-2]} )
  specs+=(
    '-t[prepare output for typesetter]'
    '1:input file:_files'
    '2:output file:_files'
  )
  optA=( -A '-?*' )  # a single '-' is a valid file name (stdin)
fi

_arguments -s -S $optA : $specs