From 80be61ed78e8410e013cb94879435d54a4907c30 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Sun, 2 Sep 2018 14:46:15 +0300
Subject: project model

---
 crates/libeditor/src/completion.rs         | 52 ++++++++++++------------
 crates/server/Cargo.toml                   |  3 +-
 crates/server/src/lib.rs                   |  1 +
 crates/server/src/main_loop/mod.rs         | 39 +++++++++++++++---
 crates/server/src/project_model.rs         | 54 ++++++++++++++++++++-----
 crates/server/src/req.rs                   |  8 ++++
 crates/server/src/server_world.rs          | 10 ++++-
 crates/server/src/thread_watcher.rs        | 33 +++++++++++++++
 crates/server/src/vfs.rs                   | 28 +++----------
 crates/server/tests/heavy_tests/main.rs    | 36 ++++++++++++++++-
 crates/server/tests/heavy_tests/support.rs | 65 +++++++++++++++++++++++++-----
 11 files changed, 251 insertions(+), 78 deletions(-)
 create mode 100644 crates/server/src/thread_watcher.rs

(limited to 'crates')

diff --git a/crates/libeditor/src/completion.rs b/crates/libeditor/src/completion.rs
index be37fb6bf..b296f6fd5 100644
--- a/crates/libeditor/src/completion.rs
+++ b/crates/libeditor/src/completion.rs
@@ -62,16 +62,16 @@ fn is_single_segment(name_ref: ast::NameRef) -> bool {
 }
 
 fn complete_expr_keywords(file: &File, fn_def: ast::FnDef, name_ref: ast::NameRef, acc: &mut Vec<CompletionItem>) {
-    acc.push(keyword("if", "if $0 { }"));
-    acc.push(keyword("match", "match $0 { }"));
-    acc.push(keyword("while", "while $0 { }"));
+    acc.push(keyword("if", "if $0 {}"));
+    acc.push(keyword("match", "match $0 {}"));
+    acc.push(keyword("while", "while $0 {}"));
     acc.push(keyword("loop", "loop {$0}"));
 
     if let Some(off) = name_ref.syntax().range().start().checked_sub(2.into()) {
         if let Some(if_expr) = find_node_at_offset::<ast::IfExpr>(file.syntax(), off) {
             if if_expr.syntax().range().end() < name_ref.syntax().range().start() {
                 acc.push(keyword("else", "else {$0}"));
-                acc.push(keyword("else if", "else if $0 { }"));
+                acc.push(keyword("else if", "else if $0 {}"));
             }
         }
     }
@@ -276,9 +276,9 @@ mod tests {
             fn quux() {
                 <|>
             }
-            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 { }") },
-                   CompletionItem { name: "match", snippet: Some("match $0 { }") },
-                   CompletionItem { name: "while", snippet: Some("while $0 { }") },
+            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 {}") },
+                   CompletionItem { name: "match", snippet: Some("match $0 {}") },
+                   CompletionItem { name: "while", snippet: Some("while $0 {}") },
                    CompletionItem { name: "loop", snippet: Some("loop {$0}") },
                    CompletionItem { name: "return", snippet: Some("return") }]"#);
     }
@@ -291,12 +291,12 @@ mod tests {
                     ()
                 } <|>
             }
-            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 { }") },
-                   CompletionItem { name: "match", snippet: Some("match $0 { }") },
-                   CompletionItem { name: "while", snippet: Some("while $0 { }") },
+            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 {}") },
+                   CompletionItem { name: "match", snippet: Some("match $0 {}") },
+                   CompletionItem { name: "while", snippet: Some("while $0 {}") },
                    CompletionItem { name: "loop", snippet: Some("loop {$0}") },
                    CompletionItem { name: "else", snippet: Some("else {$0}") },
-                   CompletionItem { name: "else if", snippet: Some("else if $0 { }") },
+                   CompletionItem { name: "else if", snippet: Some("else if $0 {}") },
                    CompletionItem { name: "return", snippet: Some("return") }]"#);
     }
 
@@ -307,9 +307,9 @@ mod tests {
                 <|>
                 92
             }
-            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 { }") },
-                   CompletionItem { name: "match", snippet: Some("match $0 { }") },
-                   CompletionItem { name: "while", snippet: Some("while $0 { }") },
+            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 {}") },
+                   CompletionItem { name: "match", snippet: Some("match $0 {}") },
+                   CompletionItem { name: "while", snippet: Some("while $0 {}") },
                    CompletionItem { name: "loop", snippet: Some("loop {$0}") },
                    CompletionItem { name: "return", snippet: Some("return $0;") }]"#);
         check_snippet_completion(r"
@@ -317,9 +317,9 @@ mod tests {
                 <|>
                 92
             }
-            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 { }") },
-                   CompletionItem { name: "match", snippet: Some("match $0 { }") },
-                   CompletionItem { name: "while", snippet: Some("while $0 { }") },
+            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 {}") },
+                   CompletionItem { name: "match", snippet: Some("match $0 {}") },
+                   CompletionItem { name: "while", snippet: Some("while $0 {}") },
                    CompletionItem { name: "loop", snippet: Some("loop {$0}") },
                    CompletionItem { name: "return", snippet: Some("return;") }]"#);
     }
@@ -332,9 +332,9 @@ mod tests {
                     () => <|>
                 }
             }
-            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 { }") },
-                   CompletionItem { name: "match", snippet: Some("match $0 { }") },
-                   CompletionItem { name: "while", snippet: Some("while $0 { }") },
+            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 {}") },
+                   CompletionItem { name: "match", snippet: Some("match $0 {}") },
+                   CompletionItem { name: "while", snippet: Some("while $0 {}") },
                    CompletionItem { name: "loop", snippet: Some("loop {$0}") },
                    CompletionItem { name: "return", snippet: Some("return $0") }]"#);
     }
@@ -345,9 +345,9 @@ mod tests {
             fn quux() -> i32 {
                 loop { <|> }
             }
-            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 { }") },
-                   CompletionItem { name: "match", snippet: Some("match $0 { }") },
-                   CompletionItem { name: "while", snippet: Some("while $0 { }") },
+            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 {}") },
+                   CompletionItem { name: "match", snippet: Some("match $0 {}") },
+                   CompletionItem { name: "while", snippet: Some("while $0 {}") },
                    CompletionItem { name: "loop", snippet: Some("loop {$0}") },
                    CompletionItem { name: "continue", snippet: Some("continue") },
                    CompletionItem { name: "break", snippet: Some("break") },
@@ -356,9 +356,9 @@ mod tests {
             fn quux() -> i32 {
                 loop { || { <|> } }
             }
-            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 { }") },
-                   CompletionItem { name: "match", snippet: Some("match $0 { }") },
-                   CompletionItem { name: "while", snippet: Some("while $0 { }") },
+            ", r#"[CompletionItem { name: "if", snippet: Some("if $0 {}") },
+                   CompletionItem { name: "match", snippet: Some("match $0 {}") },
+                   CompletionItem { name: "while", snippet: Some("while $0 {}") },
                    CompletionItem { name: "loop", snippet: Some("loop {$0}") },
                    CompletionItem { name: "return", snippet: Some("return $0") }]"#);
     }
diff --git a/crates/server/Cargo.toml b/crates/server/Cargo.toml
index c3e7a6238..cb96929c6 100644
--- a/crates/server/Cargo.toml
+++ b/crates/server/Cargo.toml
@@ -18,8 +18,9 @@ url_serde = "0.2.0"
 languageserver-types = "0.49.0"
 walkdir = "2.2.0"
 im = { version = "11.0.1", features = ["arc"] }
-text_unit = { version = "0.1.2", features = ["serde"] }
 cargo_metadata = "0.6.0"
+text_unit = { version = "0.1.2", features = ["serde"] }
+smol_str = { version = "0.1.5", features = ["serde"] }
 
 libsyntax2 = { path = "../libsyntax2" }
 libeditor = { path = "../libeditor" }
diff --git a/crates/server/src/lib.rs b/crates/server/src/lib.rs
index 096b94a6d..d874ecf84 100644
--- a/crates/server/src/lib.rs
+++ b/crates/server/src/lib.rs
@@ -30,6 +30,7 @@ mod vfs;
 mod path_map;
 mod server_world;
 mod project_model;
+mod thread_watcher;
 
 pub type Result<T> = ::std::result::Result<T, ::failure::Error>;
 pub use caps::server_capabilities;
diff --git a/crates/server/src/main_loop/mod.rs b/crates/server/src/main_loop/mod.rs
index ff267fcad..52fc00c9c 100644
--- a/crates/server/src/main_loop/mod.rs
+++ b/crates/server/src/main_loop/mod.rs
@@ -22,6 +22,7 @@ use {
     vfs::{self, FileEvent},
     server_world::{ServerWorldState, ServerWorld},
     main_loop::subscriptions::{Subscriptions},
+    project_model::{CargoWorkspace, workspace_loader},
 };
 
 #[derive(Debug)]
@@ -37,20 +38,24 @@ pub fn main_loop(
 ) -> Result<()> {
     let pool = ThreadPool::new(4);
     let (task_sender, task_receiver) = bounded::<Task>(16);
-    let (fs_events_receiver, watcher) = vfs::watch(vec![root]);
+    let (fs_events_receiver, watcher) = vfs::watch(vec![root.clone()]);
+    let (ws_root_sender, ws_receiver, ws_watcher) = workspace_loader();
+    ws_root_sender.send(root);
 
     info!("server initialized, serving requests");
     let mut state = ServerWorldState::new();
 
     let mut pending_requests = HashMap::new();
     let mut subs = Subscriptions::new();
-    let res = main_loop_inner(
+    let main_res = main_loop_inner(
         &pool,
         msg_receriver,
         msg_sender,
         task_receiver.clone(),
         task_sender,
         fs_events_receiver,
+        ws_root_sender,
+        ws_receiver,
         &mut state,
         &mut pending_requests,
         &mut subs,
@@ -63,10 +68,14 @@ pub fn main_loop(
     pool.join();
     info!("...threadpool has finished");
 
-    info!("waiting for file watcher to finish...");
-    watcher.stop()?;
-    info!("...file watcher has finished");
-    res
+    let vfs_res = watcher.stop();
+    let ws_res = ws_watcher.stop();
+
+    main_res?;
+    vfs_res?;
+    ws_res?;
+
+    Ok(())
 }
 
 fn main_loop_inner(
@@ -76,6 +85,8 @@ fn main_loop_inner(
     task_receiver: Receiver<Task>,
     task_sender: Sender<Task>,
     fs_receiver: Receiver<Vec<FileEvent>>,
+    _ws_roots_sender: Sender<PathBuf>,
+    ws_receiver: Receiver<Result<CargoWorkspace>>,
     state: &mut ServerWorldState,
     pending_requests: &mut HashMap<u64, JobHandle>,
     subs: &mut Subscriptions,
@@ -87,6 +98,7 @@ fn main_loop_inner(
             Msg(RawMessage),
             Task(Task),
             Fs(Vec<FileEvent>),
+            Ws(Result<CargoWorkspace>),
             FsWatcherDead,
         }
         trace!("selecting");
@@ -100,6 +112,10 @@ fn main_loop_inner(
                 Some(events) => Event::Fs(events),
                 None => Event::FsWatcherDead,
             }
+            recv(ws_receiver, ws) => match ws {
+                None => bail!("workspace watcher died"),
+                Some(ws) => Event::Ws(ws),
+            }
         };
         trace!("selected {:?}", event);
         let mut state_changed = false;
@@ -111,6 +127,17 @@ fn main_loop_inner(
                 state.apply_fs_changes(events);
                 state_changed = true;
             }
+            Event::Ws(ws) => {
+                match ws {
+                    Ok(ws) => {
+                        let not = RawNotification::new::<req::DidReloadWorkspace>(vec![ws.clone()]);
+                        msg_sender.send(RawMessage::Notification(not));
+                        state.set_workspaces(vec![ws]);
+                        state_changed = true;
+                    }
+                    Err(e) => warn!("loading workspace failed: {}", e),
+                }
+            }
             Event::Msg(msg) => {
                 match msg {
                     RawMessage::Request(req) => {
diff --git a/crates/server/src/project_model.rs b/crates/server/src/project_model.rs
index a33b34dd0..1c5954dad 100644
--- a/crates/server/src/project_model.rs
+++ b/crates/server/src/project_model.rs
@@ -2,30 +2,35 @@ use std::{
     collections::HashMap,
     path::{Path, PathBuf},
 };
-use libsyntax2::SmolStr;
 use cargo_metadata::{metadata_run, CargoOpt};
-use Result;
+use crossbeam_channel::{bounded, Sender, Receiver};
+use libsyntax2::SmolStr;
+
+use {
+    Result,
+    thread_watcher::ThreadWatcher,
+};
 
-#[derive(Debug)]
+#[derive(Debug, Serialize, Clone)]
 pub struct CargoWorkspace {
     ws_members: Vec<Package>,
     packages: Vec<PackageData>,
     targets: Vec<TargetData>,
 }
 
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, Serialize)]
 pub struct Package(usize);
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, Serialize)]
 pub struct Target(usize);
 
-#[derive(Debug)]
+#[derive(Debug, Serialize, Clone)]
 struct PackageData {
     name: SmolStr,
     manifest: PathBuf,
     targets: Vec<Target>
 }
 
-#[derive(Debug)]
+#[derive(Debug, Serialize, Clone)]
 struct TargetData {
     pkg: Package,
     name: SmolStr,
@@ -33,7 +38,7 @@ struct TargetData {
     kind: TargetKind,
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+#[derive(Debug, Serialize, Clone, Copy, PartialEq, Eq)]
 pub enum TargetKind {
     Bin, Lib, Example, Test, Bench, Other,
 }
@@ -66,9 +71,10 @@ impl Target {
 }
 
 impl CargoWorkspace {
-    pub fn from_path(path: &Path) -> Result<CargoWorkspace> {
+    pub fn from_cargo_metadata(path: &Path) -> Result<CargoWorkspace> {
+        let cargo_toml = find_cargo_toml(path)?;
         let meta = metadata_run(
-            Some(path),
+            Some(cargo_toml.as_path()),
             true,
             Some(CargoOpt::AllFeatures)
         ).map_err(|e| format_err!("cargo metadata failed: {}", e))?;
@@ -121,6 +127,21 @@ impl CargoWorkspace {
     }
 }
 
+fn find_cargo_toml(path: &Path) -> Result<PathBuf> {
+    if path.ends_with("Cargo.toml") {
+        return Ok(path.to_path_buf());
+    }
+    let mut curr = Some(path);
+    while let Some(path) = curr {
+        let candidate = path.join("Cargo.toml");
+        if candidate.exists() {
+            return Ok(candidate);
+        }
+        curr = path.parent();
+    }
+    bail!("can't find Cargo.toml at {}", path.display())
+}
+
 impl TargetKind {
     fn new(kinds: &[String]) -> TargetKind {
         for kind in kinds {
@@ -136,3 +157,16 @@ impl TargetKind {
         TargetKind::Other
     }
 }
+
+pub fn workspace_loader() -> (Sender<PathBuf>, Receiver<Result<CargoWorkspace>>, ThreadWatcher) {
+    let (path_sender, path_receiver) = bounded::<PathBuf>(16);
+    let (ws_sender, ws_receiver) = bounded::<Result<CargoWorkspace>>(1);
+    let thread = ThreadWatcher::spawn("workspace loader", move || {
+        path_receiver
+            .into_iter()
+            .map(|path| CargoWorkspace::from_cargo_metadata(path.as_path()))
+            .for_each(|it| ws_sender.send(it))
+    });
+
+    (path_sender, ws_receiver, thread)
+}
diff --git a/crates/server/src/req.rs b/crates/server/src/req.rs
index 893cbde81..b9e0c3796 100644
--- a/crates/server/src/req.rs
+++ b/crates/server/src/req.rs
@@ -1,6 +1,7 @@
 use std::collections::HashMap;
 use languageserver_types::{TextDocumentIdentifier, Range, Url, Position, Location};
 use url_serde;
+use project_model::CargoWorkspace;
 
 pub use languageserver_types::{
     request::*, notification::*,
@@ -167,3 +168,10 @@ pub enum FileSystemEdit {
         dst: Url,
     }
 }
+
+pub enum DidReloadWorkspace {}
+
+impl Notification for DidReloadWorkspace {
+    const METHOD: &'static str = "m/didReloadWorkspace";
+    type Params = Vec<CargoWorkspace>;
+}
diff --git a/crates/server/src/server_world.rs b/crates/server/src/server_world.rs
index d99ef661e..4d5c50428 100644
--- a/crates/server/src/server_world.rs
+++ b/crates/server/src/server_world.rs
@@ -2,6 +2,7 @@ use std::{
     fs,
     path::{PathBuf, Path},
     collections::HashMap,
+    sync::Arc,
 };
 
 use languageserver_types::Url;
@@ -11,10 +12,12 @@ use {
     Result,
     path_map::PathMap,
     vfs::{FileEvent, FileEventKind},
+    project_model::CargoWorkspace,
 };
 
 #[derive(Debug)]
 pub struct ServerWorldState {
+    pub workspaces: Arc<Vec<CargoWorkspace>>,
     pub analysis_host: AnalysisHost,
     pub path_map: PathMap,
     pub mem_map: HashMap<FileId, Option<String>>,
@@ -22,6 +25,7 @@ pub struct ServerWorldState {
 
 #[derive(Clone)]
 pub struct ServerWorld {
+    pub workspaces: Arc<Vec<CargoWorkspace>>,
     pub analysis: Analysis,
     pub path_map: PathMap,
 }
@@ -29,6 +33,7 @@ pub struct ServerWorld {
 impl ServerWorldState {
     pub fn new() -> ServerWorldState {
         ServerWorldState {
+            workspaces: Arc::new(Vec::new()),
             analysis_host: AnalysisHost::new(),
             path_map: PathMap::new(),
             mem_map: HashMap::new(),
@@ -89,9 +94,12 @@ impl ServerWorldState {
         self.analysis_host.change_file(file_id, text);
         Ok(file_id)
     }
-
+    pub fn set_workspaces(&mut self, ws: Vec<CargoWorkspace>) {
+        self.workspaces = Arc::new(ws);
+    }
     pub fn snapshot(&self) -> ServerWorld {
         ServerWorld {
+            workspaces: Arc::clone(&self.workspaces),
             analysis: self.analysis_host.analysis(self.path_map.clone()),
             path_map: self.path_map.clone()
         }
diff --git a/crates/server/src/thread_watcher.rs b/crates/server/src/thread_watcher.rs
new file mode 100644
index 000000000..98bcdfd6c
--- /dev/null
+++ b/crates/server/src/thread_watcher.rs
@@ -0,0 +1,33 @@
+use std::thread;
+use drop_bomb::DropBomb;
+use Result;
+
+pub struct ThreadWatcher {
+    name: &'static str,
+    thread: thread::JoinHandle<()>,
+    bomb: DropBomb,
+}
+
+impl ThreadWatcher {
+    pub fn spawn(name: &'static str, f: impl FnOnce() + Send + 'static) -> ThreadWatcher {
+        let thread = thread::spawn(f);
+        ThreadWatcher {
+            name,
+            thread,
+            bomb: DropBomb::new(format!("ThreadWatcher {} was not stopped", name)),
+        }
+    }
+
+    pub fn stop(mut self) -> Result<()> {
+        info!("waiting for {} to finish ...", self.name);
+        let name = self.name;
+        self.bomb.defuse();
+        let res = self.thread.join()
+            .map_err(|_| format_err!("ThreadWatcher {} died", name));
+        match &res {
+            Ok(()) => info!("... {} terminated with ok", name),
+            Err(_) => error!("... {} terminated with err", name)
+        }
+        res
+    }
+}
diff --git a/crates/server/src/vfs.rs b/crates/server/src/vfs.rs
index 2e4319cdb..2acc3f55f 100644
--- a/crates/server/src/vfs.rs
+++ b/crates/server/src/vfs.rs
@@ -1,14 +1,14 @@
 use std::{
     path::PathBuf,
-    thread,
     fs,
 };
 
 use crossbeam_channel::{Sender, Receiver, bounded};
-use drop_bomb::DropBomb;
 use walkdir::WalkDir;
 
-use Result;
+use {
+    thread_watcher::ThreadWatcher,
+};
 
 
 #[derive(Debug)]
@@ -24,26 +24,10 @@ pub enum FileEventKind {
     Remove,
 }
 
-pub struct Watcher {
-    thread: thread::JoinHandle<()>,
-    bomb: DropBomb,
-}
-
-impl Watcher {
-    pub fn stop(mut self) -> Result<()> {
-        self.bomb.defuse();
-        self.thread.join()
-            .map_err(|_| format_err!("file watcher died"))
-    }
-}
-
-pub fn watch(roots: Vec<PathBuf>) -> (Receiver<Vec<FileEvent>>, Watcher) {
+pub fn watch(roots: Vec<PathBuf>) -> (Receiver<Vec<FileEvent>>, ThreadWatcher) {
     let (sender, receiver) = bounded(16);
-    let thread = thread::spawn(move || run(roots, sender));
-    (receiver, Watcher {
-        thread,
-        bomb: DropBomb::new("Watcher should be stopped explicitly"),
-    })
+    let watcher = ThreadWatcher::spawn("vfs", move || run(roots, sender));
+    (receiver, watcher)
 }
 
 fn run(roots: Vec<PathBuf>, sender: Sender<Vec<FileEvent>>) {
diff --git a/crates/server/tests/heavy_tests/main.rs b/crates/server/tests/heavy_tests/main.rs
index 94c8243b0..9c0196f22 100644
--- a/crates/server/tests/heavy_tests/main.rs
+++ b/crates/server/tests/heavy_tests/main.rs
@@ -1,5 +1,6 @@
-extern crate tempdir;
+#[macro_use]
 extern crate crossbeam_channel;
+extern crate tempdir;
 extern crate languageserver_types;
 extern crate serde;
 extern crate serde_json;
@@ -9,10 +10,12 @@ extern crate m;
 
 mod support;
 
-use m::req::{Runnables, RunnablesParams};
+use m::req::{Runnables, RunnablesParams, DidReloadWorkspace};
 
 use support::project;
 
+const LOG: &'static str = "WARN";
+
 #[test]
 fn test_runnables() {
     let server = project(r"
@@ -40,3 +43,32 @@ fn foo() {
         ]"#
     );
 }
+
+#[test]
+fn test_project_model() {
+    let server = project(r#"
+//- Cargo.toml
+[package]
+name = "foo"
+version = "0.0.0"
+
+//- src/lib.rs
+pub fn foo() {}
+"#);
+    server.notification::<DidReloadWorkspace>(r#"[
+  {
+    "packages": [
+      {
+        "manifest": "$PROJECT_ROOT$/Cargo.toml",
+        "name": "foo",
+        "targets": [ 0 ]
+      }
+    ],
+    "targets": [
+      { "kind": "Lib", "name": "foo", "pkg": 0, "root": "$PROJECT_ROOT$/src/lib.rs" }
+    ],
+    "ws_members": [ 0 ]
+  }
+]"#
+    );
+}
diff --git a/crates/server/tests/heavy_tests/support.rs b/crates/server/tests/heavy_tests/support.rs
index 36ca56af3..006926216 100644
--- a/crates/server/tests/heavy_tests/support.rs
+++ b/crates/server/tests/heavy_tests/support.rs
@@ -3,16 +3,18 @@ use std::{
     thread,
     cell::{Cell, RefCell},
     path::PathBuf,
+    time::Duration,
+    sync::Once,
 };
 
 use tempdir::TempDir;
-use crossbeam_channel::{bounded, Sender, Receiver};
+use crossbeam_channel::{bounded, after, Sender, Receiver};
 use flexi_logger::Logger;
 use languageserver_types::{
     Url,
     TextDocumentIdentifier,
     request::{Request, Shutdown},
-    notification::DidOpenTextDocument,
+    notification::{Notification, DidOpenTextDocument},
     DidOpenTextDocumentParams,
     TextDocumentItem,
 };
@@ -23,7 +25,8 @@ use gen_lsp_server::{RawMessage, RawRequest, RawNotification};
 use m::{Result, main_loop};
 
 pub fn project(fixture: &str) -> Server {
-    Logger::with_env_or_str("").start().unwrap();
+    static INIT: Once = Once::new();
+    INIT.call_once(|| Logger::with_env_or_str(::LOG).start().unwrap());
 
     let tmp_dir = TempDir::new("test-project")
         .unwrap();
@@ -34,6 +37,7 @@ pub fn project(fixture: &str) -> Server {
         () => {
             if let Some(file_name) = file_name {
                 let path = tmp_dir.path().join(file_name);
+                fs::create_dir_all(path.parent().unwrap()).unwrap();
                 fs::write(path.as_path(), buf.as_bytes()).unwrap();
                 paths.push((path, buf.clone()));
             }
@@ -121,6 +125,25 @@ impl Server {
         );
     }
 
+    pub fn notification<N>(
+        &self,
+        expected: &str,
+    )
+    where
+        N: Notification,
+    {
+        let expected = expected.replace("$PROJECT_ROOT$", &self.dir.path().display().to_string());
+        let expected: Value = from_str(&expected).unwrap();
+        let actual = self.wait_for_notification(N::METHOD);
+        assert_eq!(
+            expected, actual,
+            "Expected:\n{}\n\
+             Actual:\n{}\n",
+            to_string_pretty(&expected).unwrap(),
+            to_string_pretty(&actual).unwrap(),
+        );
+    }
+
     fn send_request<R>(&self, id: u64, params: R::Params) -> Value
     where
         R: Request,
@@ -130,7 +153,6 @@ impl Server {
         self.sender.as_ref()
             .unwrap()
             .send(RawMessage::Request(r));
-
         while let Some(msg) = self.recv() {
             match msg {
                 RawMessage::Request(req) => panic!("unexpected request: {:?}", req),
@@ -146,15 +168,38 @@ impl Server {
         }
         panic!("no response");
     }
+    fn wait_for_notification(&self, method: &str) -> Value {
+        let f = |msg: &RawMessage| match msg {
+                RawMessage::Notification(n) if n.method == method => {
+                    Some(n.params.clone())
+                }
+                _ => None,
+        };
+
+        for msg in self.messages.borrow().iter() {
+            if let Some(res) = f(msg) {
+                return res;
+            }
+        }
+        while let Some(msg) = self.recv() {
+            if let Some(res) = f(&msg) {
+                return res;
+            }
+        }
+        panic!("no response")
+    }
     fn recv(&self) -> Option<RawMessage> {
-        self.receiver.recv()
-            .map(|msg| {
-                self.messages.borrow_mut().push(msg.clone());
-                msg
-            })
+        let timeout = Duration::from_secs(5);
+        let msg = select! {
+            recv(&self.receiver, msg) => msg,
+            recv(after(timeout)) => panic!("timed out"),
+        };
+        msg.map(|msg| {
+            self.messages.borrow_mut().push(msg.clone());
+            msg
+        })
     }
     fn send_notification(&self, not: RawNotification) {
-
         self.sender.as_ref()
             .unwrap()
             .send(RawMessage::Notification(not));
-- 
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