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#compdef stdbuf gstdbuf

local -a short long buf args
local i opt gnu=0

short=( -e -i -o )
long=( --error --output --input )
buf=( err in out )

opt='[set initial buffering for std${buf[i]}]:mode or size:((0\:unbuffered L\:line\ buffered'
if _pick_variant gnu=GNU freebsd --version; then
  gnu=1
  args=(
    '(- *)--help[display usage information]'
    '(- *)--version[display version information]'
  )
else
  opt+=' B\:fully\ buffered'
fi
opt+='))'

for ((i=1;i<=3;i++)); do
  args+=( "(${long[i]})${short[i]}+${(e)opt}" )
  (( gnu )) && args+=(
    "(${short[i]})${long[i]}=${(e)opt}"
  )
done
(( CURRENT > 2 )) && args+=( '*::command:_normal' )

_arguments -s -S $args