hack around nested libraries

crates/ra_analysis/src/imp.rs

@@ -59,6 +59,9 @@ impl FileResolverImp {
     pub(crate) fn resolve(&self, file_id: FileId, path: &RelativePath) -> Option<FileId> {
         self.inner.resolve(file_id, path)
     }
+    pub(crate) fn debug_path(&self, file_id: FileId) -> Option<std::path::PathBuf> {
+        self.inner.debug_path(file_id)
+    }
     fn inner(&self) -> *const FileResolver {
         &*self.inner
     }
@@ -138,6 +141,11 @@ impl AnalysisHostImpl {
                 let mut files = FxHashSet::default();
                 for (file_id, text) in library.files {
                     files.insert(file_id);
+                    log::debug!(
+                        "library file: {:?} {:?}",
+                        file_id,
+                        library.file_resolver.debug_path(file_id)
+                    );
                     self.db
                         .query_mut(crate::input::FileSourceRootQuery)
                         .set_constant(file_id, source_root_id);

crates/ra_analysis/src/input.rs

@@ -33,6 +33,9 @@ impl CrateGraph {
 pub trait FileResolver: fmt::Debug + Send + Sync + 'static {
     fn file_stem(&self, file_id: FileId) -> String;
     fn resolve(&self, file_id: FileId, path: &RelativePath) -> Option<FileId>;
+    fn debug_path(&self, _file_id: FileId) -> Option<std::path::PathBuf> {
+        None
+    }
 }
 
 salsa::query_group! {

crates/ra_lsp_server/src/main_loop/mod.rs

@@ -168,9 +168,35 @@ fn main_loop_inner(
                     let workspaces = vec![ws];
                     feedback(internal_mode, "workspace loaded", msg_sender);
                     for ws in workspaces.iter() {
-                        for pkg in ws.packages().filter(|pkg| !pkg.is_member(ws)) {
-                            debug!("sending root, {}", pkg.root(ws).to_path_buf().display());
-                            fs_worker.send(pkg.root(ws).to_path_buf());
+                        // Add each library as constant input. If library is
+                        // within the workspace, don't treat it as a library.
+                        //
+                        // HACK: If source roots are nested, pick the outer one.
+
+                        let mut roots = ws
+                            .packages()
+                            .filter(|pkg| !pkg.is_member(ws))
+                            .filter_map(|pkg| {
+                                let root = pkg.root(ws).to_path_buf();
+                                if root.starts_with(&ws_root) {
+                                    None
+                                } else {
+                                    Some(root)
+                                }
+                            })
+                            .collect::<Vec<_>>();
+                        roots.sort_by_key(|it| it.as_os_str().len());
+                        let unique = roots
+                            .iter()
+                            .enumerate()
+                            .filter(|&(idx, long)| {
+                                !roots[..idx].iter().any(|short| long.starts_with(short))
+                            })
+                            .map(|(_idx, root)| root);
+
+                        for root in unique {
+                            debug!("sending root, {}", root.display());
+                            fs_worker.send(root.to_owned());
                         }
                     }
                     state.set_workspaces(workspaces);

crates/ra_lsp_server/src/path_map.rs

@@ -79,6 +79,10 @@ impl FileResolver for PathMap {
         let path = normalize(&path);
         self.get_id(&path)
     }
+
+    fn debug_path(&self, file_id: FileId) -> Option<PathBuf> {
+        Some(self.get_path(file_id).to_owned())
+    }
 }
 
 fn normalize(path: &Path) -> PathBuf {