Get the module for the current line of a file

[axelson]

Is it possible to expose a public API that will return the Module that corresponds to the current line in the file? (i.e. if there are three modules defined in a file, this API will return the module whose body is on the specified line).

This would be a replacement for ElixirLS calling into ElixirSense.Core.Metadata.get_env:

https://github.com/elixir-lsp/elixir-ls/blob/c9b095fc797613b33c7bc39ca72e9b48c69aedac/apps/debugger/lib/debugger/server.ex#L616

Related issue: elixir-lsp/elixir-ls#234

[lukaszsamson]

I believe with the changes from #234 the need for that is lower.
The problem with our approach is that we use token_metadata from AST. This works well for standard elixir code but it will fail for anything macro generated. In elixir a code position moay correspond to many modules. There's no better standard lib API that returns code ranges for module as of 1.15. Compile tracer only returns begin line in macro env. Docs return begin line and column.