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# Restrict the start of the editable line to the region between cursor
# and mark (including the character at the end). Can be bound used as
# a zle widget, or called as a function from another widget.
#
# Optionally accepts exactly two arguments, which are used instead of
# $CURSOR and $MARK as limits to the range.
#
# Upon exit, $MARK is always the start of the edited range and $CURSOR
# the end of the range, even if they began in the opposite order.
#
# Other options:
# -p pretext show "pretext" instead of the buffer text before the region.
# -P posttext show "posttext" instead of the buffer text after the region.
# Either or both may be empty.
# -n Only replace the text before or after the region with
# the -p or -P options if the text was not empty.
# -l lbufvar $lbufvar is assigned the value of $LBUFFER and
# -r rbufvar $rbufvar is assigned the value of $RBUFFER
# from any recursive edit (i.e. not with -S or -R). Neither
# lbufvar nor rbufvar may begin with the prefix "_ntr_".
# -S statevar
# -R statevar
# Save or restore the state in/from the parameter named statevar. In
# either case no recursive editing takes place; this will typically be
# done within the calling function between calls with -S and -R. The
# statevar may not begin with the prefix "_ntr_" which is reserved for
# parameters within narrow-to-region.
# set the minimum of options to avoid changing behaviour away from
# user preferences from within recursive-edit
setopt localoptions noshwordsplit noksharrays
local _ntr_newbuf _ntr_lbuf_return _ntr_rbuf_return
local _ntr_predisplay=$PREDISPLAY _ntr_postdisplay=$POSTDISPLAY
integer _ntr_savelim=UNDO_LIMIT_NO _ntr_changeno _ntr_histno=HISTNO
integer _ntr_start _ntr_end _ntr_swap _ntr_cursor=$CURSOR _ntr_mark=$MARK
integer _ntr_stat
local _ntr_opt _ntr_pretext _ntr_posttext _ntr_usepretext _ntr_useposttext
local _ntr_nonempty _ntr_save _ntr_restore _ntr_lbuffer _ntr_rbuffer
while getopts "l:np:P:r:R:S:" _ntr_opt; do
case $_ntr_opt in
(l) _ntr_lbuf_return=$OPTARG
;;
(n) _ntr_nonempty=1
;;
(p) _ntr_pretext=$OPTARG _ntr_usepretext=1
;;
(P) _ntr_posttext=$OPTARG _ntr_useposttext=1
;;
(r) _ntr_rbuf_return=$OPTARG
;;
(R) _ntr_restore=$OPTARG
;;
(S) _ntr_save=$OPTARG
;;
(*) [[ $_ntr_opt != '?' ]] && print "$0: unhandled option: $_ntr_opt" >&2
return 1
;;
esac
done
(( OPTIND > 1 )) && shift $(( OPTIND - 1 ))
if [[ $_ntr_restore = _ntr_* || $_ntr_save = _ntr_* ||
$_ntr_lbuf_return = _ntr_* || $_ntr_rbuf_return = _ntr_* ]]; then
zle -M "$0: _ntr_ prefix is reserved" >&2
return 1
fi
if [[ -n $_ntr_save || -z $_ntr_restore ]]; then
if (( $# )); then
if (( $# != 2 )); then
zle -M "$0: supply zero or two arguments" >&2
return 1
fi
_ntr_start=$1
_ntr_end=$2
else
_ntr_start=$MARK
_ntr_end=$CURSOR
fi
if (( _ntr_start > _ntr_end )); then
_ntr_swap=_ntr_start
_ntr_start=_ntr_end
_ntr_end=_ntr_swap
fi
(( _ntr_cursor -= _ntr_start, _ntr_mark -= _ntr_start ))
_ntr_lbuffer=${BUFFER[1,_ntr_start]}
if [[ -z $_ntr_usepretext || ( -n $_ntr_nonempty && -z $_ntr_lbuffer ) ]]
then
_ntr_pretext=$_ntr_lbuffer
fi
_ntr_rbuffer=${BUFFER[_ntr_end+1,-1]}
if [[ -z $_ntr_useposttext || ( -n $_ntr_nonempty && -z $_ntr_rbuffer ) ]]
then
_ntr_posttext=$_ntr_rbuffer
fi
_ntr_changeno=$UNDO_CHANGE_NO
PREDISPLAY="$_ntr_predisplay$_ntr_pretext"
POSTDISPLAY="$_ntr_posttext$_ntr_postdisplay"
if [[ -n $_ntr_save ]]; then
builtin typeset -ga $_ntr_save
set -A $_ntr_save "${_ntr_predisplay}" "${_ntr_postdisplay}" \
"${_ntr_savelim}" "${_ntr_changeno}" \
"${_ntr_start}" "${_ntr_end}" "${_ntr_histno}" || return 1
fi
BUFFER=${BUFFER[_ntr_start+1,_ntr_end]}
CURSOR=$_ntr_cursor
MARK=$_ntr_mark
zle split-undo
UNDO_LIMIT_NO=$UNDO_CHANGE_NO
fi
if [[ -z $_ntr_save && -z $_ntr_restore ]]; then
zle recursive-edit
_ntr_stat=$?
[[ -n $_ntr_lbuf_return ]] &&
builtin typeset -g ${_ntr_lbuf_return}="${LBUFFER}"
[[ -n $_ntr_rbuf_return ]] &&
builtin typeset -g ${_ntr_rbuf_return}="${RBUFFER}"
fi
if [[ -n $_ntr_restore || -z $_ntr_save ]]; then
if [[ -n $_ntr_restore ]]; then
if ! { _ntr_predisplay="${${(@P)_ntr_restore}[1]}"
_ntr_postdisplay="${${(@P)_ntr_restore}[2]}"
_ntr_savelim="${${(@P)_ntr_restore}[3]}"
_ntr_changeno="${${(@P)_ntr_restore}[4]}"
_ntr_start="${${(@P)_ntr_restore}[5]}"
_ntr_end="${${(@P)_ntr_restore}[6]}"
_ntr_histno="${${(@P)_ntr_restore}[7]}" }; then
zle -M Failed. >&2
return 1
fi
fi
_ntr_newbuf="$BUFFER"
HISTNO=_ntr_histno
zle undo $_ntr_changeno
PREDISPLAY=$_ntr_predisplay
POSTDISPLAY=$_ntr_postdisplay
BUFFER[_ntr_start+1,_ntr_end]="$_ntr_newbuf"
(( MARK = _ntr_start, CURSOR = _ntr_start + ${#_ntr_newbuf} ))
UNDO_LIMIT_NO=_ntr_savelim
fi
return $_ntr_stat
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