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search: refactor doResults

Administrator requested to merge run-backend-tests/refactor-doResults into main

Created by: stefanhengl

This is a refactoring of doResults

Why?

  • This change should make some of the experiments we want to do around performance much easier. For example, for global searches, we plan to call zoekt much earlier, even before determineRepos. With this change, we can simply call a method on the new aggregator, instead of duplicating code in various places.
  • The new aggregator makes the purpose of the variables we previously declared much more explicit.
  • doResults was (still is) very long.

What?

Previously

we declared a lot of variables in a block and kicked-off 1 goroutine per result type with each goroutine modifying the variables results, common, multiErr, and fileMatches (each protected by their own mutex).

Now

The variables are fields of a struct and each goroutine calls a method on this struct.

Downside

  • we add yet another layer to our call hierarchy

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