csharp: Possible to go-to-interface for library functions?

[unhammer]

In the old omnisharp.el I could xref-find-definitions on logger.Info and it would put me in a file Logger.cs with the method signatures of that class (no implementations, but I could see public methods and such). If I do it with eglot, I also get a Logger.cs, but it's completely empty. It'd be nice if we could have that feature working, but maybe LSP makes this difficult?

[joaotavora]

post the Eglot events log around the find definitions transaction

[unhammer]

[jsonrpc] e[15:18:40.101] --> textDocument/definition[9] {"jsonrpc":"2.0","id":9,"method":"textDocument/definition","params":{"textDocument":{"uri":"file:///home/me/foo/WSProject/Foo.cs"},"position":{"line":677,"character":21}}}
[jsonrpc] e[15:18:42.601]   <-- textDocument/definition[9] #[0 "\303\304\305\306\307\310\311\300\312\301\302F\313\300\314\301\302FF\315\316F\257\6\207" [:character :line 2226 :id 9 :jsonrpc "2.0" :result :range :end 24 :start 20 :uri "file:///%24metadata%24/Project/WSProject/Assembly/NLog/Symbol/NLog/Logger.cs"] 21]

[unhammer]

I grepped for metadata in the old omnisharp.el, maybe

https://github.com/OmniSharp/omnisharp-emacs/blob/e276ff140666057c6d6848f9cfc84a82e3a7650c/omnisharp-navigation-actions.el#L38

is what did it? It seems like it from that docstring:

  "Prepares metadata buffer if required (if FILENAME is missing and
METADATA-SOURCE is available) and then invokes CALLBACK with either
buffer or FILENAME of the file containing the definition.

Metadata buffer is made readonly and both omnisharp-mode and csharp-mode's
are enabled on this buffer."