3 files changed, 83 insertions, 36 deletions

diff --git a/crates/ra_lsp_server/src/main_loop/mod.rs b/crates/ra_lsp_server/src/main_loop/mod.rs
index e681062ca..9ddc3fd0b 100644
--- a/crates/ra_lsp_server/src/main_loop/mod.rs
+++ b/crates/ra_lsp_server/src/main_loop/mod.rs
@@ -8,7 +8,7 @@ use gen_lsp_server::{
     handle_shutdown, ErrorCode, RawMessage, RawNotification, RawRequest, RawResponse,
 };
 use languageserver_types::NumberOrString;
-use ra_analysis::{FileId, LibraryData};
+use ra_analysis::{Canceled, FileId, LibraryData};
 use rayon::{self, ThreadPool};
 use rustc_hash::FxHashSet;
 use serde::{de::DeserializeOwned, Serialize};
@@ -376,7 +376,7 @@ impl<'a> PoolDispatcher<'a> {
                         Err(e) => {
                             match e.downcast::<LspError>() {
                                 Ok(lsp_error) => RawResponse::err(id, lsp_error.code, lsp_error.message),
-                                Err(e) => RawResponse::err(id, ErrorCode::InternalError as i32, e.to_string())
+                                Err(e) => RawResponse::err(id, ErrorCode::InternalError as i32, format!("{}\n{}", e, e.backtrace()))
                             }
                         }
                     };
@@ -408,14 +408,22 @@ fn update_file_notifications_on_threadpool(
     pool.spawn(move || {
         for file_id in subscriptions {
             match handlers::publish_diagnostics(&world, file_id) {
-                Err(e) => error!("failed to compute diagnostics: {:?}", e),
+                Err(e) => {
+                    if !is_canceled(&e) {
+                        error!("failed to compute diagnostics: {:?}", e);
+                    }
+                },
                 Ok(params) => {
                     let not = RawNotification::new::<req::PublishDiagnostics>(&params);
                     sender.send(Task::Notify(not));
                 }
             }
             match handlers::publish_decorations(&world, file_id) {
-                Err(e) => error!("failed to compute decorations: {:?}", e),
+                Err(e) => {
+                    if !is_canceled(&e) {
+                        error!("failed to compute decorations: {:?}", e);
+                    }
+                },
                 Ok(params) => {
                     let not = RawNotification::new::<req::PublishDecorations>(&params);
                     sender.send(Task::Notify(not))
@@ -432,3 +440,7 @@ fn feedback(intrnal_mode: bool, msg: &str, sender: &Sender<RawMessage>) {
     let not = RawNotification::new::<req::InternalFeedback>(&msg.to_string());
     sender.send(RawMessage::Notification(not));
 }
+
+fn is_canceled(e: &failure::Error) -> bool {
+    e.downcast_ref::<Canceled>().is_some()
+}
diff --git a/crates/ra_lsp_server/src/path_map.rs b/crates/ra_lsp_server/src/path_map.rs
index d32829382..d5957d673 100644
--- a/crates/ra_lsp_server/src/path_map.rs
+++ b/crates/ra_lsp_server/src/path_map.rs
@@ -1,4 +1,7 @@
-use std::path::{Component, Path, PathBuf};
+use std::{
+    fmt,
+    path::{Component, Path, PathBuf},
+};
 
 use im;
 use ra_analysis::{FileId, FileResolver};
@@ -10,7 +13,7 @@ pub enum Root {
     Lib,
 }
 
-#[derive(Debug, Default, Clone)]
+#[derive(Default, Clone)]
 pub struct PathMap {
     next_id: u32,
     path2id: im::HashMap<PathBuf, FileId>,
@@ -18,19 +21,28 @@ pub struct PathMap {
     id2root: im::HashMap<FileId, Root>,
 }
 
+impl fmt::Debug for PathMap {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.write_str("PathMap { ... }")
+    }
+}
+
 impl PathMap {
     pub fn new() -> PathMap {
         Default::default()
     }
-    pub fn get_or_insert(&mut self, path: PathBuf, root: Root) -> FileId {
-        self.path2id
+    pub fn get_or_insert(&mut self, path: PathBuf, root: Root) -> (bool, FileId) {
+        let mut inserted = false;
+        let file_id = self.path2id
             .get(path.as_path())
             .map(|&id| id)
             .unwrap_or_else(|| {
+                inserted = true;
                 let id = self.new_file_id();
                 self.insert(path, id, root);
                 id
-            })
+            });
+        (inserted, file_id)
     }
     pub fn get_id(&self, path: &Path) -> Option<FileId> {
         self.path2id.get(path).map(|&id| id)
@@ -105,8 +117,8 @@ mod test {
     #[test]
     fn test_resolve() {
         let mut m = PathMap::new();
-        let id1 = m.get_or_insert(PathBuf::from("/foo"), Root::Workspace);
-        let id2 = m.get_or_insert(PathBuf::from("/foo/bar.rs"), Root::Workspace);
+        let (_, id1) = m.get_or_insert(PathBuf::from("/foo"), Root::Workspace);
+        let (_, id2) = m.get_or_insert(PathBuf::from("/foo/bar.rs"), Root::Workspace);
         assert_eq!(m.resolve(id1, &RelativePath::new("bar.rs")), Some(id2),)
     }
 }
diff --git a/crates/ra_lsp_server/src/server_world.rs b/crates/ra_lsp_server/src/server_world.rs
index 69b2a1cd1..25986e230 100644
--- a/crates/ra_lsp_server/src/server_world.rs
+++ b/crates/ra_lsp_server/src/server_world.rs
@@ -5,7 +5,7 @@ use std::{
 };
 
 use languageserver_types::Url;
-use ra_analysis::{Analysis, AnalysisHost, CrateGraph, CrateId, FileId, FileResolver, LibraryData};
+use ra_analysis::{Analysis, AnalysisHost, AnalysisChange, CrateGraph, FileId, FileResolver, LibraryData};
 use rustc_hash::FxHashMap;
 
 use crate::{
@@ -39,30 +39,40 @@ impl ServerWorldState {
         }
     }
     pub fn apply_fs_changes(&mut self, events: Vec<FileEvent>) {
+        let mut change = AnalysisChange::new();
+        let mut inserted = false;
         {
             let pm = &mut self.path_map;
             let mm = &mut self.mem_map;
-            let changes = events
+            events
                 .into_iter()
                 .map(|event| {
                     let text = match event.kind {
-                        FileEventKind::Add(text) => Some(text),
+                        FileEventKind::Add(text) => text,
                     };
                     (event.path, text)
                 })
-                .map(|(path, text)| (pm.get_or_insert(path, Root::Workspace), text))
-                .filter_map(|(id, text)| {
-                    if mm.contains_key(&id) {
-                        mm.insert(id, text);
+                .map(|(path, text)| {
+                    let (ins, file_id) = pm.get_or_insert(path, Root::Workspace);
+                    inserted |= ins;
+                    (file_id, text)
+                })
+                .filter_map(|(file_id, text)| {
+                    if mm.contains_key(&file_id) {
+                        mm.insert(file_id, Some(text));
                         None
                     } else {
-                        Some((id, text))
+                        Some((file_id, text))
                     }
+                })
+                .for_each(|(file_id, text)| {
+                    change.add_file(file_id, text)
                 });
-            self.analysis_host.change_files(changes);
         }
-        self.analysis_host
-            .set_file_resolver(Arc::new(self.path_map.clone()));
+        if inserted {
+            change.set_file_resolver(Arc::new(self.path_map.clone()))
+        }
+        self.analysis_host.apply_change(change);
     }
     pub fn events_to_files(
         &mut self,
@@ -76,24 +86,31 @@ impl ServerWorldState {
                     let FileEventKind::Add(text) = event.kind;
                     (event.path, text)
                 })
-                .map(|(path, text)| (pm.get_or_insert(path, Root::Lib), text))
+                .map(|(path, text)| (pm.get_or_insert(path, Root::Lib).1, text))
                 .collect()
         };
         let resolver = Arc::new(self.path_map.clone());
         (files, resolver)
     }
     pub fn add_lib(&mut self, data: LibraryData) {
-        self.analysis_host.add_library(data);
+        let mut change = AnalysisChange::new();
+        change.add_library(data);
+        self.analysis_host.apply_change(change);
     }
 
     pub fn add_mem_file(&mut self, path: PathBuf, text: String) -> FileId {
-        let file_id = self.path_map.get_or_insert(path, Root::Workspace);
-        self.analysis_host
-            .set_file_resolver(Arc::new(self.path_map.clone()));
-        self.mem_map.insert(file_id, None);
+        let (inserted, file_id) = self.path_map.get_or_insert(path, Root::Workspace);
         if self.path_map.get_root(file_id) != Root::Lib {
-            self.analysis_host.change_file(file_id, Some(text));
+            let mut change = AnalysisChange::new();
+            if inserted {
+                change.add_file(file_id, text);
+                change.set_file_resolver(Arc::new(self.path_map.clone()));
+            } else {
+                change.change_file(file_id, text);
+            }
+            self.analysis_host.apply_change(change);
         }
+        self.mem_map.insert(file_id, None);
         file_id
     }
 
@@ -103,7 +120,9 @@ impl ServerWorldState {
             .get_id(path)
             .ok_or_else(|| format_err!("change to unknown file: {}", path.display()))?;
         if self.path_map.get_root(file_id) != Root::Lib {
-            self.analysis_host.change_file(file_id, Some(text));
+            let mut change = AnalysisChange::new();
+            change.change_file(file_id, text);
+            self.analysis_host.apply_change(change);
         }
         Ok(())
     }
@@ -120,12 +139,16 @@ impl ServerWorldState {
         // Do this via file watcher ideally.
         let text = fs::read_to_string(path).ok();
         if self.path_map.get_root(file_id) != Root::Lib {
-            self.analysis_host.change_file(file_id, text);
+            let mut change = AnalysisChange::new();
+            if let Some(text) = text {
+                change.change_file(file_id, text);
+            }
+            self.analysis_host.apply_change(change);
         }
         Ok(file_id)
     }
     pub fn set_workspaces(&mut self, ws: Vec<CargoWorkspace>) {
-        let mut crate_roots = FxHashMap::default();
+        let mut crate_graph = CrateGraph::new();
         ws.iter()
             .flat_map(|ws| {
                 ws.packages()
@@ -134,13 +157,13 @@ impl ServerWorldState {
             })
             .for_each(|root| {
                 if let Some(file_id) = self.path_map.get_id(root) {
-                    let crate_id = CrateId(crate_roots.len() as u32);
-                    crate_roots.insert(crate_id, file_id);
+                    crate_graph.add_crate_root(file_id);
                 }
             });
-        let crate_graph = CrateGraph { crate_roots };
         self.workspaces = Arc::new(ws);
-        self.analysis_host.set_crate_graph(crate_graph);
+        let mut change = AnalysisChange::new();
+        change.set_crate_graph(crate_graph);
+        self.analysis_host.apply_change(change);
     }
     pub fn snapshot(&self) -> ServerWorld {
         ServerWorld {