_i3swallow() {
    [[ -z $BUFFER ]] && zle up-history
    if [[ $BUFFER == i3-swallow\ * ]]; then
        LBUFFER="${LBUFFER#i3-swallow }"
    else
        LBUFFER="i3-swallow $LBUFFER"
    fi
}
zle -N _i3swallow

# Defined shortcut keys: [Pos1][Pos1]
bindkey "OHOH" _i3swallow