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#autoload
local of ofwuc ouc oss ofwy ofwg ofwl cmd
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"
# 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"
# 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"
# 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"
# 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 \
'(--ignore-case -i)'{--ignore-case,-i}'[case insensitive]' \
'--ignore-file-name-case[ignore case when comparing file names]' \
'--no-ignore-file-name-case[consider case when comparing file names]' \
'(--ignore-tab-expansion -E)'{--ignore-tab-expansion,-E}'[ignore changes due to tab expansion]' \
'(-b)--ignore-space-change[ignore changes in the amount of white space]' \
'(--ignore-space-change)-b[ignore changes in the amount of white space]' \
'(--ignore-all-space -w)'{--ignore-all-space,-w}'[ignore all white space]' \
'(-B)--ignore-blank-lines[ignore lines that are all blank]' \
'(--ignore-blank-lines)-B[ignore lines that are all blank]' \
'(--ignore-matching-lines -I)'{--ignore-matching-lines=,-I+}'[ignore lines that match regex]:line exclusion regex:' \
'--strip-trailing-cr[strip trailing carriage return on input]' \
'(--text -a)'{--text,-a}'[treat all files as text]' \
"($of $oss)--context=-[output a context diff]:number of lines of copied context:" \
"($of $oss)-C+[output a context diff]:number of lines of copied context:" \
"($of $oss)-c[output a context diff]" \
"($of $oss)--unified=-[output a unified diff]:number of lines of unified context:" \
"($of $oss)-U+[output a unified diff]:number of lines of unified context:" \
"($of $oss)-u[output a unified diff]" \
"($ofwuc $oss)*--label=[set label to use instead of file name]:label:" \
"($ofwuc $oss)*-L+[set label to use instead of file name]:label:" \
"($ofwuc $oss -p)--show-c-function[show C function of each change]" \
"($ofwuc $oss --show-c-function)-p[show C function of each change]" \
"($ofwuc $oss -F)--show-function-line=[show the most recent line matching regex]:regex:" \
"($ofwuc $oss --show-function-line)-F+[show the most recent line matching regex]:regex:" \
"($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 $ouc)--suppress-common-lines[do not output common lines]" \
"($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 $oss)--unchanged-line-format=[set unchanged line format]:unchanged line format:" \
'(--paginate -l)'{--paginate,-l}'[output through pr]' \
'(--expand-tabs -t)'{--expand-tabs,-t}'[expand tabs to spaces]' \
'(--initial-tab -T)'{--initial-tab,-T}'[prepend a tab]' \
'(--recursive -r)'{--recursive,-r}'[recursively compare subdirectories]' \
'(--new-file -N)'{--new-file,-N}'[treat absent files as empty]' \
'(-P)--unidirectional-new-file[treat absent first files as empty]' \
'(--unidirectional-new-file)-P[treat absent first files as empty]' \
'(-s)--report-identical-files[report when two files are the same]' \
'(--report-identical-files)-s[report when two files are the same]' \
'(-x)--exclude=[exclude files matching pattern]:exclusion pattern:' \
'(--exclude)-x+[exclude files matching pattern]:exclusion pattern:' \
'(-X)--exclude-from=[exclude files matching pattern in file]:exclude file:_files' \
'(--exclude-from)-X+[exclude files matching pattern in file]:exclude file:_files' \
'(-S)--starting-file=[set first file in comparison]:start with file:_files' \
'(--starting-file)-S+[set first file in comparison]:start with file:_files' \
'(--to-file)--from-file=[compare specified file to all operands]:from file:_files' \
'(--from-file)--to-file=[compare all operands to specified file]:to file:_files' \
'--horizon-lines=[set number of lines to keep in prefix and suffix]:number of horizon lines:' \
'(--minimal -d)'{--minimal,-d}'[try to find a smaller set of changes]' \
'(--speed-large-files -H)'{--speed-large-files,-H}'[assume large files and many small changes]' \
'(--version -v)'{--version,-v}'[output version info]' \
'--help[help text]' \
"$@"
else
_arguments \
"(-e -f)-c[output a context diff]" \
"(-c -f)-e[output an ed script]" \
"(-c -e)-f[output a reversed ed script]" \
'-b[skip trailing white spaces]' \
'-r[recursively compare subdirectories]' \
"$@"
fi
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