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#compdef etags

integer ret=1
local context state line expl
typeset -A opt_args

_arguments \
  '(-a --append)'{-a,--append}'[append tag entries]' \
  '--packages-only[only generate tags for Ada packages]' \
  '--declarations[C etc.: tags for function declarations]' \
  '(-D --no-defines)'{-D,--no-defines}'[No tags for preprocessor definitions]' \
  {-i-,--include=}'[Tag file should include another]:tag file:_files' \
  {-l-,--language=}'[Specify language]:language:->lang' \
  '--no-globals[No tag entries for global variables]' \
  '--no-members[No tag entries for structure members]' \
  {-r-,--regex=}'[Specify regular expression]:regular expression:->regex' \
  {-R,--no-regex}'[No regular expressions for tags]' \
  '(-I --ignore-indentation)'{-I,--ignore-indentation}'[Closing brace in first col may not be start of func]' \
  '(-o --output)'{-o-,--output=}'[Specify output file]:file:_files' \
  '--parse-stdin=[Specify file name for stdin]:file name:_files' \
  '(-V --version)'{-V,--version}'[Output version]' \
  '(-h --help)'{-h,--help}'[Output help]' \
  '*:file to tag:_files' \
  && ret=0

case $state in
  (lang)
  local -a langs
  langs=(${${${${(f)"$(etags --help)"}:#^  [^[:blank:]]##[[:blank:]]##([[:alnum:].]*|)}#  }%%[[:blank:]]*})
  _wanted languages expl language compadd -a langs && ret=0
  ;;

  (regex)
  if compset -P @; then
    _files && ret=0
  elif [[ -n $PREFIX ]]; then
    local sep=$PREFIX[1]
    [[ $sep = [\\*?#] ]] && sep="\\$sep"
    local -a match mbegin mend
    if compset -P "$sep*$sep*$sep"; then
      local mods=smi
      mods=${mods//[${PREFIX}]}
      if [[ -n $mods ]]; then
	compset -P '*'
	local -a modarr
	[[ $mods = *i* ]] && modarr+=("i:ignore case")
	[[ $mods = *m* ]] && modarr+=("m:allow multi-line matches")
	[[ $mods = *s* ]] && modarr+=("s:multi-line, dot matches newline")
	_describe -t modifiers modifier modarr && ret=0
      fi
    elif compset -P "$sep*$sep"; then
      _message "tagname" && ret=0
    else
      compset -P "$sep"
      _message "tag regexp" && ret=0
    fi
  else
    _message "regexp separator or @ for file" && ret=0
  fi
  ;;
esac

return ret