Temporary lf bookmarks implementation

lfrc.part

cmd mark-new ${{
    # querying mark
    read -e -p "Mark as: " -n 1 markchar
    markfile="${XDG_CONFIG_HOME:-$HOME/.config}/lf/marks"
    # removing old mark if present
    sed -i "/^$markchar .*/d" "$markfile"
    # adding new mark
    { cat "$markfile" 2>/dev/null;
      echo "$markchar" "$(pwd)"; } |
        sort > "$markfile.tmp"
    mv -f "${markfile}.tmp" "$markfile"
}}

cmd mark-cd ${{
    # loading and presenting
    markfile="${XDG_CONFIG_HOME:-$HOME/.config}/lf/marks"
    echo "Current marks:"
    cat "$markfile" 2>/dev/null
    # querying mark
    read -e -p "Go to mark: " -n 1 markchar
    dir=$(grep -e "^$markchar" < "$markfile" | cut -d' ' -f2)
    # setting last visited dir
    sed -i "/^' .*$/d" "$markfile"
    echo "' $(pwd)" >> "$markfile"
    # going to wanted dir
    [ -n "$dir" ] && lf -remote "send $id cd $dir"
}}

map m mark-new
map "'" mark-cd