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#autoload

local of ofwuc ouc oss ofwy ofwg ofwl cmd
local -a args

cmd="$1"
shift

if _pick_variant -c $cmd gnu=GNU unix -v; then
  # output formats
  of="-y --side-by-side -n --rcs -e -f --ed -q --brief -c -C --context -u -U \
  --unified --old-group-format --new-group-format --changed-group-format \
  --unchanged-group-format --line-format --old-line-format --new-line-format \
  --unchanged-line-format --normal -D --ifdef"

  # output formats w/o unified and context
  ofwuc="-y --side-by-side -n --rcs -e -f --ed -q --brief --old-group-format \
  --new-group-format --changed-group-format --unchanged-group-format --normal \
  --line-format --old-line-format --new-line-format --unchanged-line-format \
  -D --ifdef"

  # option specific to unified or context diff
  ouc='-L --label -p --show-c-function -F --show-function-line'

  # option specific to side by side
  oss='-W --width --left-column --suppress-common-lines'

  # output formats w/o side by side
  ofwy="-n --rcs -e -f --ed -q --brief -c -C --context -u -U --unified \
  --old-group-format --new-group-format --changed-group-format \
  --unchanged-group-format --line-format --old-line-format \
  --new-line-format --unchanged-line-format --normal -D --ifdef"

  # output formats w/o group format
  ofwg="-n --rcs -e -f --ed -q --brief -c -C --context -u -U --unified --normal \
  --line-format --old-line-format --new-line-format --unchanged-line-format
  -D --ifdef"

  # output formats w/o line format
  ofwl="-n --rcs -e -f --ed -q --brief -c -C --context -u -U --unified \
  --old-group-format --new-group-format --changed-group-format --normal \
  --unchanged-group-format"

  _arguments -s \
    '(-i --ignore-case)'{-i,--ignore-case}'[case insensitive]' \
    '(--no-ignore-file-name-case)--ignore-file-name-case[ignore case when comparing file names]' \
    '(--ignore-file-name-case)--no-ignore-file-name-case[consider case when comparing file names]' \
    '(-E --ignore-tab-expansion)'{-E,--ignore-tab-expansion}'[ignore changes due to tab expansion]' \
    '(-b --ignore-space-change)'{-b,--ignore-space-change}'[ignore changes in the amount of white space]' \
    '(--ignore-all-space -w)'{--ignore-all-space,-w}'[ignore all white space]' \
    '(-B --ignore-blank-lines)'{-B,--ignore-blank-lines}'[ignore lines that are all blank]' \
    '(-I --ignore-matching-lines)'{-I+,--ignore-matching-lines=}'[ignore lines that match regex]:line exclusion regex:' \
    '--strip-trailing-cr[strip trailing carriage return on input]' \
    '(-a --text)'{-a,--text}'[treat all files as text]' \
    "($of $oss)"{-C+,--context=-}'[output a context diff]:number of lines of copied context' \
    "($of $oss)-c[output a context diff]" \
    "($of $oss)"{-U+,--unified=-}'[output a unified diff]:number of lines of unified context' \
    "($of $oss)-u[output a unified diff]" \
    "($ofwuc $oss)*"{-L+,--label=}'[set label to use instead of file name]:label' \
    "($ofwuc $oss -p --show-c-function)"{-p,--show-c-function}'[show C function of each change]' \
    "($ofwuc $oss -F --show-function-line)"{-F+,--show-function-line=}'[show the most recent line matching regex]:regex' \
    "($of $ouc $oss)--brief[output only whether files differ]" \
    "($of $ouc $oss)-q[output only whether files differ]" \
    "($of $ouc $oss -e --ed)"{--ed,-e}'[output an ed script]' \
    "($of $ouc $oss)--normal[output a normal diff]" \
    "($of $ouc $oss)--forward-ed[output a reversed ed script]" \
    "($of $ouc $oss)-f[output a reversed ed script]" \
    "($of $ouc $oss)--rcs[RCS format diff]" \
    "($of $ouc $oss)-n[RCS format diff]" \
    "($of $ouc)--side-by-side[output in two columns]" \
    "($of $ouc)-y[output in two columns]" \
    "($ofwy $ouc --width -W)"{--width=,-W+}'[set size of line]:number of characters per line' \
    "($ofwy $ouc)--left-column[output only left column of common lines]" \
    "($ofwy $ouc)--suppress-common-lines[do not output common lines]" \
    "($of $oss)"{-D,--ifdef=}'[output merged file with preprocessor directives]:preprocessor symbol' \
    "($ofwg $ouc $oss)--old-group-format=[set old group format]:old group format" \
    "($ofwg $ouc $oss)--new-group-format=[set new group format]:new group format" \
    "($ofwg $ouc $oss)--changed-group-format=[set changed group format]:changed group format" \
    "($ofwg $ouc $oss)--unchanged-group-format=[set unchanged group format]:unchanged group format" \
    "($ofwl $ouc $oss)--line-format=[set line format]:line format" \
    "($ofwl $ouc $oss)--old-line-format=[set old line format]:old line format" \
    "($ofwl $ouc $oss)--new-line-format=[set new line format]:new line format" \
    "($ofwl $ouc $oss)--unchanged-line-format=[set unchanged line format]:unchanged line format" \
    '(-l --paginate)'{-l,--paginate}'[output through pr]' \
    '(-t --expand-tabs)'{-t,--expand-tabs}'[expand tabs to spaces]' \
    '(-T --initial-tab)'{-T,--initial-tab}'[prepend a tab]' \
    '--tabsize=[specify width of tab]:width' \
    '(-r --recursive)'{-r,--recursive}'[recursively compare subdirectories]' \
    '(-N --new-file)'{-N,--new-file}'[treat absent files as empty]' \
    '(-P --unidirectional-new-file)'{-P,--unidirectional-new-file}'[treat absent first files as empty]' \
    '(-s --report-identical-files)'{-s,--report-identical-files}'[report when two files are the same]' \
    \*{-x+,--exclude=}'[exclude files matching pattern]:exclusion pattern' \
    '(-X --exclude-from)'{-X+,--exclude-from=}'[exclude files matching pattern in file]:exclude file:_files' \
    '(-S --starting-file)'{-S+,--starting-file=}'[set first file in comparison]:start with file:_files' \
    '(--to-file)--from-file=[compare specified file to all operands]:from file:_files' \
    '(--from-file)--to-file=[compare all operands to specified file]:to file:_files' \
    '--horizon-lines=[set number of lines to keep in prefix and suffix]:number of horizon lines' \
    '(-d --minimal)'{-d,--minimal}'[try to find a smaller set of changes]' \
    '(-H --speed-large-files)'{-H,--speed-large-files}'[assume large files and many small changes]' \
    '(-v --version)'{-v,--version}'[display version info]' \
    '--help[display help info]' \
    "$@"
else
  case $OSTYPE in
    solaris2.<9->)
      args=( '(-c -e -f -C)-u[output a unified diff]' )
    ;&
    solaris*)
      args+=(
	'-i[case insensitive]'
        '-t[expand tabs to spaces]'
	'-w[ignore all white space]'
        '(-c -e -f -n -u -h -D)-C+[output a context diff]:number of lines of copied context'
	'(-c -e -f -n -u -C -D)-h[do a fast, half-hearted job]'
	'(-c -e -f -u -h -C -D)-n[reversed ed script]'
	'(-c -e -f -n -u -h -C)-D[output merged file with preprocessor directives]:preprocessor symbol'
        '-l[output through pr]'
	'-s[report on identical files]'
        '-S+[set first file in comparison]:start with file:_files'
      )
    ;;
  esac
  
  _arguments "$args[@]" \
    "(-e -f -u -n)-c[output a context diff]" \
    "(-c -f -u -n)-e[output an ed script]" \
    "(-c -e -u -n)-f[output a reversed ed script]" \
    '-b[skip trailing white spaces]' \
    '-r[recursively compare subdirectories]' \
    "$@"
fi

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