I have a vision of a device kind of like a pair of scissors, except instead of shears there are two levered attachments: a holder for a needle and a hook to man

I have a vision of a device kind of like a pair of scissors, except instead of shears there are two levered attachments: a holder for a needle and a hook to manipulate yarn. Every time you close and open the handles, it puts one standard knot onto the needle. This could make knitting a row as easy as snip snip snip, but I don't know if it would actually be useful in knitting real projects.