Support document symbols (`textDocument/documentSymbol`)

[withered-magic]

https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_documentSymbol

[Ezekiel Warren]

I'm curious if "document symbols" in starlark would include bazel/buck targets?

i.e. would this

_some_local_var = []

cc_library(name = "some_target")

result in these symbols?

_some_local_var
:some_target

same question for "workspace symbols" https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#workspace_symbol

[withered-magic]

Yep, that's what I'm envisioning! Although the initial implementation here would likely use the same heuristic that goto def for labels currently uses and derive the list of targets from call expressions that have a name argument (as opposed to using bazel query or something)