Specify pull request to use, similar to commit/tag/version

[jhd-lego]

Would be really neat if we could specify the PR to use for a plugin.
Concretely I would like to test out nvim-neotest/neotest-go#44
I currently have

  {
    "nvim-neotest/neotest",
    dependencies = {
      "nvim-neotest/neotest-go",
      branch = "fix/file-level-test-status",
    },
    -- snip
  },

This works because the branch is in the same repo.
It becomes more complex if the branch is not in the same repo.
Would be really cool if we had the option of doing pr = 44

[wookayin]

+1, or more in general, refspecs: refs/pull/44/head

[Jomik]

Seems like this would be quite slow as I cannot really see any way other than trying to fetch the ref using git fetch origin refs/pull/44/head:__lazy_ref - if that fails, then we can use the head of a branch called __lazy_ref.
Any ideas @folke ?
I can try to give this a crack, but not 100% sure how lazy does this stuff :)
Thinking we have to add an extra or M.get_remote_ref here

lazy.nvim/lua/lazy/manage/git.lua

Line 163 in bb5cc9e

return Util.head(repo .. "/.git/refs/" .. ref) or M.packed_refs(repo)[ref]

[folke]

yeah, that would kill performance....

People should really just use the lazy dev option for this to test PRs

[Jomik]

I can agree with that. It should hopefully only hit performance for the cases where you define a refspec explicitly and it is not fetched normally.
You can also automatically fetch pull with git config remote.origin.fetch '+refs/pull/*:refs/remotes/origin/pull/*' as github and gitlab does actually serve them. Could that perhaps help in making this performant?