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#compdef fish

local MATCH MBEGIN MEND ret=1
local -a args context line state state_descr
local -A opt_args

args=(
  # unlike most shells, fish's -c is a normal option-with-optarg which can be
  # interleaved with other options and can even be given multiple times.
  # obviously we can't complete command strings reliably here but we'll try
  '(1)*'{-c+,--command=}'[execute specified command string]: :_cmdstring'
  '*'{-C+,--init-command=}'[execute specified command before other input]: :_cmdstring'
  '(-d --debug)'{-d+,--debug=}'[enable debug output for specified categories]: :->debug'
  '(-o --debug-output)'{-o+,--debug-output=}'[specify debug output file]:debug output file:_files'
  '(-f --features)'{-f+,--features=}'[enable specified feature flags]: :->feature'
  '(-i --interactive)'{-i,--interactive}'[act as interactive shell]'
  '(-l --login)'{-l,--login}'[act as login shell]'
  '(-N --no-config)'{-N,--no-config}'[do not read configuration files]'
  '(-n --no-execute)'{-n,--no-execute}'[check syntax only (do not execute commands)]'
  '(-p --profile)'{-p+,--profile=}'[specify profile output file]:profile output file:_files'
  '--profile-startup=[specify start-up profile output file]:profile output file:_files'
  '(-P --private)'{-P,--private}'[enable private mode (no history)]'
  '--print-rusage-self[output getrusage() stats on exit]'
  '(- : *)--print-debug-categories[display debug categories]'
  '(- : *)'{-v,--version}'[display version information]'
  '(- : *)'{-h,--help}'[display usage information]'
  '(-)1:script file:_files'
  '(-)*:argument:_files'
)

_arguments -s -S -A '-*' : $args && ret=0

case $state in
  debug)
    local -a tmp=( ${(f)"$(
      _call_program debug-categories $words[1] --print-debug-categories
    )"} )
    tmp=( ${${tmp/[[:space:]]##/\[}/%/\]} )
    tmp=( ${tmp/(#m)\[[A-Z][^A-Z]/${(L)MATCH}} )
    tmp=( ${tmp/.\]/\]} )
    _values -s, 'debug category' $tmp && ret=0
    ;;

  feature)
    local name def ver desc
    local -a flags_on flags_off versions flags tmp

    while IFS=$'\t ' read -r name def ver desc; do
      desc=${${desc/#(#m)[A-Z][^A-Z]/${(L)MATCH}}//(#m)[]\\]/\\$MATCH}
      if [[ $def == on ]]; then
        flags_on+=( $name"[$desc ($ver, defaults on)]" )
      else
        flags_off+=( $name"[$desc ($ver, defaults off)]" )
      fi
      versions+=( $ver"[all features introduced in fish $ver]" )
    done < <(
      _call_program feature-flags $words[1] -NPc '"status features"'
    )

    # if an individual flag is already on, show the no- variant, and vice versa
    flags+=( no-$^flags_on $flags_off )
    # always show both for these 'groups'
    flags+=( {no-,}all'[all features]' {no-,}${(u)versions} )

    # only show redundant variants of individual flags when necessary
    tmp=( no-$^flags_off )
    [[ ${PREFIX##*,} == n* ]] || tmp=( '!'$^tmp )
    flags+=( $tmp )

    tmp=( ${(M)flags_on:#${${PREFIX##*,}[1]:----}*} )
    (( $#tmp )) || tmp=( '!'$^flags_on )
    flags+=( $tmp )

    _values -s, 'feature flag' $flags && ret=0
    ;;
esac

return ret