Add ripgrep producer alternative for line-based grep

[spywhere]

A grep with --vimgrep will produce duplicate lines as there are multiple matches within the same line. While the introduced ripgrep.vimgrep.line producer will produce only a single line per match, regardless of multiple matches within the same line. This should help in a case where only line matches are needed, and to not waste processing power to the filtering.

[camspiers]

This genuinely awesome, thanks!

[gegoune]

How to use that with snap.maps? Also, there is no documentation at all. Is it meant to be active by default?

[camspiers]

It's optional, at the moment it isn't documented, you can use it with snap.maps as you would any custom function. Something like:

snap.maps {
  {"<Leader>g", snap.config.vimgrep {
    producer = snap.get"producer.ripgrep.vimgrep".line {},
  }}
}