Only generate lenses for elp-supported files

Summary:
This is to prevent crashes we are seeing trying to generate lenses for file of kind `OutsideProjectModel`.
This diff filters to only try for files known to be supported by ELP.
We are not able to do this at a general request level, because we don't have a `FileId` there.

Discussion of alternatives welcome

Reviewed By: ir-regular

Differential Revision: D56634386

fbshipit-source-id: 1247e3419d56ad2dec1008e62e30a4fdce203db2

crates/base_db/src/lib.rs

@@ -109,6 +109,13 @@ impl FileKind {
             _ => false,
         }
     }
+
+    pub fn is_elp_supported(self) -> bool {
+        match self {
+            Self::SrcModule | Self::TestModule | Self::Header | Self::Escript => true,
+            _ => false,
+        }
+    }
 }
 
 pub trait FileLoader {

crates/elp/src/handlers.rs

@@ -877,6 +877,9 @@ pub(crate) fn handle_code_lens(
     let lens_config = snap.config.lens();
 
     let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
+    if !snap.analysis.file_kind(file_id)?.is_elp_supported() {
+        return Ok(None);
+    }
     let line_index = snap.analysis.line_index(file_id)?;
     if let Ok(Some(project_id)) = snap.analysis.project_id(file_id) {
         let annotations = snap.analysis.annotations(file_id)?;