[clangd] Add hidden tweaks to dump AST/selection.

Authored by sammccall on Jun 18 2019, 6:37 AM.


[clangd] Add hidden tweaks to dump AST/selection.

This introduces a few new concepts:

  • tweaks have an Intent (they don't all advertise as refactorings)
  • tweaks may produce messages (for ShowMessage notification). Generalized Replacements -> Effect.
  • tweaks (and other features) may be hidden (clangd -hidden-features flag). We may choose to promote these one day. I'm not sure they're worth their own feature flags though.

Verified it in vim-clangd (not yet open source), curious if the UI is ok in VSCode.

Reviewers: ilya-biryukov

Subscribers: mgorny, MaskRay, jkorous, arphaman, kadircet, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D62538

llvm-svn: 363680