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Allow searches on sourcegraph.com without `repo` keyword

Created by: ijt

Currently sourcegraph.com doesn't show anything useful if you do a simple search without specifying a repo. For example, say we want to see an example of how to use "d3.selectAll". Currently sourcegraph.com gives this result:

Screen Shot 2019-07-23 at 14 19 02

It would be more useful if this search would show some examples of using this function in some popular repositories.

Here are some steps to get there:

  • Figure out how much memory we'll probably need for zoekt-webserver by summing the sizes of all the repos, probably using http://github.com/ijt/reposize
  • Run zoekt-webserver and zoekt-sourcegraph-indexserver on sourcegraph.com
  • When zoekt-sourcegraph-indexserver asks for the repositories to index, give it say 20k repositories at random
  • Rank the repositories somehow (github stars, clone count, number of commits in other repos sharing a SHA with a commit in this repo) and index the top 20k based on that
  • When a query comes in without a repo field, search over some plausible repos instead of serving up a suggestion box.