6 files changed, 94 insertions, 120 deletions

diff --git a/crates/ra_project_model/src/lib.rs b/crates/ra_project_model/src/lib.rs
index dd9c80691..0ab64a1e0 100644
--- a/crates/ra_project_model/src/lib.rs
+++ b/crates/ra_project_model/src/lib.rs
@@ -62,16 +62,16 @@ pub struct PackageRoot {
     /// Is a member of the current workspace
     is_member: bool,
 }
-
 impl PackageRoot {
-    pub fn new(path: PathBuf, is_member: bool) -> PackageRoot {
-        PackageRoot { path, is_member }
+    pub fn new_member(path: PathBuf) -> PackageRoot {
+        Self { path, is_member: true }
     }
-
-    pub fn path(&self) -> &PathBuf {
+    pub fn new_non_member(path: PathBuf) -> PackageRoot {
+        Self { path, is_member: false }
+    }
+    pub fn path(&self) -> &Path {
         &self.path
     }
-
     pub fn is_member(&self) -> bool {
         self.is_member
     }
@@ -130,70 +130,45 @@ impl ProjectWorkspace {
     pub fn to_roots(&self) -> Vec<PackageRoot> {
         match self {
             ProjectWorkspace::Json { project } => {
-                let mut roots = Vec::with_capacity(project.roots.len());
-                for root in &project.roots {
-                    roots.push(PackageRoot::new(root.path.clone(), true));
-                }
-                roots
-            }
-            ProjectWorkspace::Cargo { cargo, sysroot } => {
-                let mut roots = Vec::with_capacity(cargo.packages().len() + sysroot.crates().len());
-                for pkg in cargo.packages() {
-                    let root = cargo[pkg].root().to_path_buf();
-                    let member = cargo[pkg].is_member;
-                    roots.push(PackageRoot::new(root, member));
-                }
-                for krate in sysroot.crates() {
-                    roots.push(PackageRoot::new(sysroot[krate].root_dir().to_path_buf(), false))
-                }
-                roots
+                project.roots.iter().map(|r| PackageRoot::new_member(r.path.clone())).collect()
             }
+            ProjectWorkspace::Cargo { cargo, sysroot } => cargo
+                .packages()
+                .map(|pkg| PackageRoot {
+                    path: cargo[pkg].root().to_path_buf(),
+                    is_member: cargo[pkg].is_member,
+                })
+                .chain(sysroot.crates().map(|krate| {
+                    PackageRoot::new_non_member(sysroot[krate].root_dir().to_path_buf())
+                }))
+                .collect(),
         }
     }
 
     pub fn out_dirs(&self) -> Vec<PathBuf> {
         match self {
             ProjectWorkspace::Json { project } => {
-                let mut out_dirs = Vec::with_capacity(project.crates.len());
-                for krate in &project.crates {
-                    if let Some(out_dir) = &krate.out_dir {
-                        out_dirs.push(out_dir.to_path_buf());
-                    }
-                }
-                out_dirs
+                project.crates.iter().filter_map(|krate| krate.out_dir.as_ref()).cloned().collect()
             }
-            ProjectWorkspace::Cargo { cargo, sysroot: _sysroot } => {
-                let mut out_dirs = Vec::with_capacity(cargo.packages().len());
-                for pkg in cargo.packages() {
-                    if let Some(out_dir) = &cargo[pkg].out_dir {
-                        out_dirs.push(out_dir.to_path_buf());
-                    }
-                }
-                out_dirs
+            ProjectWorkspace::Cargo { cargo, sysroot: _ } => {
+                cargo.packages().filter_map(|pkg| cargo[pkg].out_dir.as_ref()).cloned().collect()
             }
         }
     }
 
     pub fn proc_macro_dylib_paths(&self) -> Vec<PathBuf> {
         match self {
-            ProjectWorkspace::Json { project } => {
-                let mut proc_macro_dylib_paths = Vec::with_capacity(project.crates.len());
-                for krate in &project.crates {
-                    if let Some(out_dir) = &krate.proc_macro_dylib_path {
-                        proc_macro_dylib_paths.push(out_dir.to_path_buf());
-                    }
-                }
-                proc_macro_dylib_paths
-            }
-            ProjectWorkspace::Cargo { cargo, sysroot: _sysroot } => {
-                let mut proc_macro_dylib_paths = Vec::with_capacity(cargo.packages().len());
-                for pkg in cargo.packages() {
-                    if let Some(dylib_path) = &cargo[pkg].proc_macro_dylib_path {
-                        proc_macro_dylib_paths.push(dylib_path.to_path_buf());
-                    }
-                }
-                proc_macro_dylib_paths
-            }
+            ProjectWorkspace::Json { project } => project
+                .crates
+                .iter()
+                .filter_map(|krate| krate.proc_macro_dylib_path.as_ref())
+                .cloned()
+                .collect(),
+            ProjectWorkspace::Cargo { cargo, sysroot: _sysroot } => cargo
+                .packages()
+                .filter_map(|pkg| cargo[pkg].proc_macro_dylib_path.as_ref())
+                .cloned()
+                .collect(),
         }
     }
 
@@ -216,10 +191,12 @@ impl ProjectWorkspace {
         let mut crate_graph = CrateGraph::default();
         match self {
             ProjectWorkspace::Json { project } => {
-                let mut crates = FxHashMap::default();
-                for (id, krate) in project.crates.iter().enumerate() {
-                    let crate_id = json_project::CrateId(id);
-                    if let Some(file_id) = load(&krate.root_module) {
+                let crates: FxHashMap<_, _> = project
+                    .crates
+                    .iter()
+                    .enumerate()
+                    .filter_map(|(seq_index, krate)| {
+                        let file_id = load(&krate.root_module)?;
                         let edition = match krate.edition {
                             json_project::Edition::Edition2015 => Edition::Edition2015,
                             json_project::Edition::Edition2018 => Edition::Edition2018,
@@ -249,8 +226,8 @@ impl ProjectWorkspace {
                             .clone()
                             .map(|it| proc_macro_client.by_dylib_path(&it));
                         // FIXME: No crate name in json definition such that we cannot add OUT_DIR to env
-                        crates.insert(
-                            crate_id,
+                        Some((
+                            json_project::CrateId(seq_index),
                             crate_graph.add_crate_root(
                                 file_id,
                                 edition,
@@ -261,9 +238,9 @@ impl ProjectWorkspace {
                                 extern_source,
                                 proc_macro.unwrap_or_default(),
                             ),
-                        );
-                    }
-                }
+                        ))
+                    })
+                    .collect();
 
                 for (id, krate) in project.crates.iter().enumerate() {
                     for dep in &krate.deps {
@@ -287,9 +264,11 @@ impl ProjectWorkspace {
                 }
             }
             ProjectWorkspace::Cargo { cargo, sysroot } => {
-                let mut sysroot_crates = FxHashMap::default();
-                for krate in sysroot.crates() {
-                    if let Some(file_id) = load(&sysroot[krate].root) {
+                let sysroot_crates: FxHashMap<_, _> = sysroot
+                    .crates()
+                    .filter_map(|krate| {
+                        let file_id = load(&sysroot[krate].root)?;
+
                         // Crates from sysroot have `cfg(test)` disabled
                         let cfg_options = {
                             let mut opts = default_cfg_options.clone();
@@ -300,22 +279,22 @@ impl ProjectWorkspace {
                         let env = Env::default();
                         let extern_source = ExternSource::default();
                         let proc_macro = vec![];
+                        let crate_name = CrateName::new(&sysroot[krate].name)
+                            .expect("Sysroot crate names should not contain dashes");
 
                         let crate_id = crate_graph.add_crate_root(
                             file_id,
                             Edition::Edition2018,
-                            Some(
-                                CrateName::new(&sysroot[krate].name)
-                                    .expect("Sysroot crate names should not contain dashes"),
-                            ),
+                            Some(crate_name),
                             cfg_options,
                             env,
                             extern_source,
                             proc_macro,
                         );
-                        sysroot_crates.insert(krate, crate_id);
-                    }
-                }
+                        Some((krate, crate_id))
+                    })
+                    .collect();
+
                 for from in sysroot.crates() {
                     for &to in sysroot[from].deps.iter() {
                         let name = &sysroot[to].name;
diff --git a/crates/rust-analyzer/src/cli/load_cargo.rs b/crates/rust-analyzer/src/cli/load_cargo.rs
index 2c0bde920..69133e4e4 100644
--- a/crates/rust-analyzer/src/cli/load_cargo.rs
+++ b/crates/rust-analyzer/src/cli/load_cargo.rs
@@ -36,8 +36,7 @@ pub(crate) fn load_cargo(
     extern_dirs.extend(ws.out_dirs());
 
     let mut project_roots = ws.to_roots();
-    project_roots
-        .extend(extern_dirs.iter().map(|path| PackageRoot::new(path.to_path_buf(), false)));
+    project_roots.extend(extern_dirs.iter().cloned().map(PackageRoot::new_non_member));
 
     let (sender, receiver) = unbounded();
     let sender = Box::new(move |t| sender.send(t).unwrap());
@@ -46,7 +45,7 @@ pub(crate) fn load_cargo(
             .iter()
             .map(|pkg_root| {
                 RootEntry::new(
-                    pkg_root.path().clone(),
+                    pkg_root.path().to_owned(),
                     RustPackageFilterBuilder::default()
                         .set_member(pkg_root.is_member())
                         .into_vfs_filter(),
@@ -58,12 +57,12 @@ pub(crate) fn load_cargo(
     );
 
     let source_roots = roots
-        .iter()
-        .map(|&vfs_root| {
+        .into_iter()
+        .map(|vfs_root| {
             let source_root_id = vfs_root_to_id(vfs_root);
             let project_root = project_roots
                 .iter()
-                .find(|it| it.path() == &vfs.root2path(vfs_root))
+                .find(|it| it.path() == vfs.root2path(vfs_root))
                 .unwrap()
                 .clone();
             (source_root_id, project_root)
diff --git a/crates/rust-analyzer/src/main_loop.rs b/crates/rust-analyzer/src/main_loop.rs
index 95e676e0f..8d1429196 100644
--- a/crates/rust-analyzer/src/main_loop.rs
+++ b/crates/rust-analyzer/src/main_loop.rs
@@ -23,6 +23,7 @@ use lsp_types::{
 use ra_flycheck::{url_from_path_with_drive_lowercasing, CheckTask};
 use ra_ide::{Canceled, FileId, LibraryData, SourceRootId};
 use ra_prof::profile;
+use ra_project_model::{PackageRoot, ProjectWorkspace};
 use ra_vfs::{VfsFile, VfsTask, Watch};
 use relative_path::RelativePathBuf;
 use rustc_hash::FxHashSet;
@@ -131,8 +132,8 @@ pub fn main_loop(ws_roots: Vec<PathBuf>, config: Config, connection: Connection)
             let registration_options = req::DidChangeWatchedFilesRegistrationOptions {
                 watchers: workspaces
                     .iter()
-                    .flat_map(|ws| ws.to_roots())
-                    .filter(|root| root.is_member())
+                    .flat_map(ProjectWorkspace::to_roots)
+                    .filter(PackageRoot::is_member)
                     .map(|root| format!("{}/**/*.rs", root.path().display()))
                     .map(|glob_pattern| req::FileSystemWatcher { glob_pattern, kind: None })
                     .collect(),
diff --git a/crates/rust-analyzer/src/main_loop/subscriptions.rs b/crates/rust-analyzer/src/main_loop/subscriptions.rs
index bee6437cf..2c76418be 100644
--- a/crates/rust-analyzer/src/main_loop/subscriptions.rs
+++ b/crates/rust-analyzer/src/main_loop/subscriptions.rs
@@ -17,6 +17,6 @@ impl Subscriptions {
         self.subs.remove(&file_id);
     }
     pub(crate) fn subscriptions(&self) -> Vec<FileId> {
-        self.subs.iter().cloned().collect()
+        self.subs.iter().copied().collect()
     }
 }
diff --git a/crates/rust-analyzer/src/vfs_glob.rs b/crates/rust-analyzer/src/vfs_glob.rs
index 91b33f94e..ff37a7008 100644
--- a/crates/rust-analyzer/src/vfs_glob.rs
+++ b/crates/rust-analyzer/src/vfs_glob.rs
@@ -29,10 +29,14 @@ impl RustPackageFilterBuilder {
         self.is_member = is_member;
         self
     }
-    pub fn exclude(mut self, glob: Glob) -> RustPackageFilterBuilder {
-        self.exclude.add(glob);
+
+    pub fn exclude(mut self, globs: impl IntoIterator<Item = Glob>) -> RustPackageFilterBuilder {
+        for glob in globs.into_iter() {
+            self.exclude.add(glob);
+        }
         self
     }
+
     pub fn into_vfs_filter(self) -> Box<dyn Filter> {
         let RustPackageFilterBuilder { is_member, mut exclude } = self;
         for &glob in ALWAYS_IGNORED {
@@ -87,7 +91,7 @@ fn test_globs() {
 
     let filter = RustPackageFilterBuilder::default()
         .set_member(true)
-        .exclude(Glob::new("src/llvm-project/**").unwrap())
+        .exclude(std::iter::once(Glob::new("src/llvm-project/**").unwrap()))
         .into_vfs_filter();
 
     assert!(!filter.include_dir(RelativePath::new("src/llvm-project/clang")));
diff --git a/crates/rust-analyzer/src/world.rs b/crates/rust-analyzer/src/world.rs
index 5674f42ef..365f57d8c 100644
--- a/crates/rust-analyzer/src/world.rs
+++ b/crates/rust-analyzer/src/world.rs
@@ -87,44 +87,35 @@ impl WorldState {
     ) -> WorldState {
         let mut change = AnalysisChange::new();
 
-        let mut roots = Vec::new();
-        roots.extend(folder_roots.iter().map(|path| {
-            let mut filter = RustPackageFilterBuilder::default().set_member(true);
-            for glob in exclude_globs.iter() {
-                filter = filter.exclude(glob.clone());
-            }
-            RootEntry::new(path.clone(), filter.into_vfs_filter())
-        }));
-        for ws in workspaces.iter() {
-            roots.extend(ws.to_roots().into_iter().map(|pkg_root| {
-                let mut filter =
-                    RustPackageFilterBuilder::default().set_member(pkg_root.is_member());
-                for glob in exclude_globs.iter() {
-                    filter = filter.exclude(glob.clone());
-                }
-                RootEntry::new(pkg_root.path().clone(), filter.into_vfs_filter())
-            }));
-        }
-
-        let mut extern_dirs = FxHashSet::default();
-        for ws in workspaces.iter() {
-            extern_dirs.extend(ws.out_dirs());
-        }
-
-        let mut extern_source_roots = FxHashMap::default();
-
-        roots.extend(extern_dirs.iter().map(|path| {
-            let mut filter = RustPackageFilterBuilder::default().set_member(false);
-            for glob in exclude_globs.iter() {
-                filter = filter.exclude(glob.clone());
-            }
-            RootEntry::new(PathBuf::from(&path), filter.into_vfs_filter())
-        }));
+        let extern_dirs: FxHashSet<_> =
+            workspaces.iter().flat_map(ProjectWorkspace::out_dirs).collect();
+
+        let roots: Vec<_> = {
+            let create_filter = |is_member| {
+                RustPackageFilterBuilder::default()
+                    .set_member(is_member)
+                    .exclude(exclude_globs.iter().cloned())
+                    .into_vfs_filter()
+            };
+            folder_roots
+                .iter()
+                .map(|path| RootEntry::new(path.clone(), create_filter(true)))
+                .chain(workspaces.iter().flat_map(ProjectWorkspace::to_roots).map(|pkg_root| {
+                    RootEntry::new(pkg_root.path().to_owned(), create_filter(pkg_root.is_member()))
+                }))
+                .chain(
+                    extern_dirs
+                        .iter()
+                        .map(|path| RootEntry::new(path.to_owned(), create_filter(false))),
+                )
+                .collect()
+        };
 
         let (task_sender, task_receiver) = unbounded();
         let task_sender = Box::new(move |t| task_sender.send(t).unwrap());
         let (mut vfs, vfs_roots) = Vfs::new(roots, task_sender, watch);
 
+        let mut extern_source_roots = FxHashMap::default();
         for r in vfs_roots {
             let vfs_root_path = vfs.root2path(r);
             let is_local = folder_roots.iter().any(|it| vfs_root_path.starts_with(it));