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# Transpose lines. This is like in emacs: with a positive argument
# (default 1) the current line and the previous line are swapped and the
# cursor goes down one line; with a negative argument the previous two
# lines are swapped and the cursor goes up one line.
emulate -L zsh
setopt extendedglob # xtrace
local -a match mbegin mend
integer count=${NUMERIC:-1}
local init prev lline final rrline
if (( ${NUMERIC:-1} < 0 )); then
while (( count++ )); do
[[ $LBUFFER != (#b)(|*$'\n')([^$'\n']#$'\n')([^$'\n']#$'\n')([^$'\n']#) ]] && return 1
LBUFFER=$match[1]$match[3]
RBUFFER=$match[2]$match[4]$RBUFFER
done
else
while (( count-- )); do
[[ $LBUFFER != (#b)(*)$'\n'([^$'\n']#) ]] && return 1
prev=$match[1]
lline=$match[2]
if [[ $prev = (#b)(*$'\n')([^$'\n']#) ]]; then
init=$match[1]
prev=$match[2]
fi
if [[ $RBUFFER = (#b)([^$'\n']#)$'\n'(*) ]]; then
rline=$match[1]
final=$match[2]
prev+=$'\n'
else
rline=$RBUFFER
fi
LBUFFER=$init$lline$rline$'\n'$prev
RBUFFER=$final
done
fi
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