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# -*- mode: sh *-*
# vim: ft=zsh
# the de-facto prefix is determined by:
# * zstyle (by widget name) if it's set
# * else the dedicated environment variable
# * else it's detected at runtime
local prefix
if ! zstyle -s :zle:$WIDGET prefix prefix; then
prefix=$ELEVATECMD
if [[ -z $prefix ]]; then
# the runtime detection is uncached in case you install/uninstall
if [[ -x =doas ]]; then prefix=doas
elif [[ -x =sudo ]]; then prefix=sudo
else return 1 # do nothing
fi
fi
fi
# if the prefix is already present, we remove it
if [[ $BUFFER = ${(b)~prefix}\ * ]]; then
# if the cursor is not inside the prefix
if [[ $#LBUFFER -gt $#prefix ]]; then
# then just remove it from the LBUFFER
LBUFFER=${LBUFFER#$prefix }
# otherwise, the cursor *is* inside the prefix
else
# so remove it from the buffer and move the cursor to start of line
BUFFER=${BUFFER#$prefix }
CURSOR=0
fi
# otherwise we add it
else
# prefix always goes into LBUFFER since it's not there yet
LBUFFER="$prefix $LBUFFER"
fi
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