https://github.com/junegunn/fzf/issues/405

fzf-curr-pos.sh

#!/usr/bin/env bash
#
# The logic in the getpos function is stolen from
# http://stackoverflow.com/a/2575525
# Pass "row" or "col" as an argument to get their positions

getpos ()
{
        exec </dev/tty

        typeset -n arg=$1
        typeset \
                col \
                row \
                oldstty=$(stty -g)

        stty raw -echo min 0

        printf '%b' "\033[6n" >/dev/tty
        IFS='[;' read -d R _ row col </dev/tty

        stty "$oldstty"

        printf '%d' "$(( arg - 1))"

        unset -n arg
}

typeset -i \
        lines=$(tput lines) \
        row=$(getpos row);
typeset -i \
        halfway=lines/2 \
        start_row=lines-row;
typeset -x FZF_DEFAULT_OPTS=$FZF_DEFAULT_OPTS

# Start fzf from the current row
if
        (( row < halfway ))
then
        FZF_DEFAULT_OPTS="$FZF_DEFAULT_OPTS --reverse --margin $(( row - 1 )),0,0"
else
        (( start_row == 1 && (start_row=0) ))
        FZF_DEFAULT_OPTS="$FZF_DEFAULT_OPTS --no-reverse --margin 0,0,${start_row}"
fi

fzf

# vim: set ts=8 sw=8 tw=0 et :