add sysroot boilerplate

crates/ra_lsp_server/src/main_loop/handlers.rs

@@ -347,11 +347,11 @@ pub fn handle_runnables(
                 .read()
                 .file2path(ra_vfs::VfsFile(file_id.0.into()));
             let res = world.workspaces.iter().find_map(|ws| {
-                let tgt = ws.target_by_root(&path)?;
+                let tgt = ws.cargo.target_by_root(&path)?;
                 let res = CargoTargetSpec {
-                    package: tgt.package(ws).name(ws).to_string(),
-                    target: tgt.name(ws).to_string(),
-                    target_kind: tgt.kind(ws),
+                    package: tgt.package(&ws.cargo).name(&ws.cargo).to_string(),
+                    target: tgt.name(&ws.cargo).to_string(),
+                    target_kind: tgt.kind(&ws.cargo),
                 };
                 Some(res)
             });

crates/ra_lsp_server/src/project_model.rs

@@ -1,4 +1,7 @@
-use std::path::{Path, PathBuf};
+use std::{
+    path::{Path, PathBuf},
+    process::Command,
+};
 
 use cargo_metadata::{metadata_run, CargoOpt};
 use ra_syntax::SmolStr;
@@ -9,6 +12,36 @@ use thread_worker::{WorkerHandle, Worker};
 
 use crate::Result;
 
+#[derive(Debug, Clone)]
+pub struct ProjectWorkspace {
+    pub(crate) cargo: CargoWorkspace,
+    pub(crate) sysroot: Sysroot,
+}
+
+impl ProjectWorkspace {
+    pub fn discover(path: &Path) -> Result<ProjectWorkspace> {
+        let cargo_toml = find_cargo_toml(path)?;
+        let cargo = CargoWorkspace::from_cargo_metadata(&cargo_toml)?;
+        let sysroot = sysroot_info(&cargo_toml)?;
+        let res = ProjectWorkspace { cargo, sysroot };
+        Ok(res)
+    }
+}
+
+pub fn workspace_loader() -> (Worker<PathBuf, Result<ProjectWorkspace>>, WorkerHandle) {
+    thread_worker::spawn::<PathBuf, Result<ProjectWorkspace>, _>(
+        "workspace loader",
+        1,
+        |input_receiver, output_sender| {
+            input_receiver
+                .into_iter()
+                .map(|path| ProjectWorkspace::discover(path.as_path()))
+                .try_for_each(|it| output_sender.send(it))
+                .unwrap()
+        },
+    )
+}
+
 /// `CargoWorksapce` represents the logical structure of, well, a Cargo
 /// workspace. It pretty closely mirrors `cargo metadata` output.
 ///
@@ -63,6 +96,11 @@ pub enum TargetKind {
     Other,
 }
 
+#[derive(Debug, Clone)]
+pub(crate) struct Sysroot {
+    crates: FxHashMap<SmolStr, PathBuf>,
+}
+
 impl Package {
     pub fn name(self, ws: &CargoWorkspace) -> &str {
         ws.packages[self].name.as_str()
@@ -160,6 +198,68 @@ impl CargoWorkspace {
     }
 }
 
+fn sysroot_info(cargo_toml: &Path) -> Result<Sysroot> {
+    let rustc_output = Command::new("rustc")
+        .current_dir(cargo_toml.parent().unwrap())
+        .args(&["--print", "sysroot"])
+        .output()?;
+    if !rustc_output.status.success() {
+        failure::bail!("failed to locate sysroot")
+    }
+    let stdout = String::from_utf8(rustc_output.stdout)?;
+    let sysroot_path = Path::new(stdout.trim());
+    let src = sysroot_path.join("lib/rustlib/src/rust/src");
+
+    let crates: &[(&str, &[&str])] = &[
+        (
+            "std",
+            &[
+                "alloc_jemalloc",
+                "alloc_system",
+                "panic_abort",
+                "rand",
+                "compiler_builtins",
+                "unwind",
+                "rustc_asan",
+                "rustc_lsan",
+                "rustc_msan",
+                "rustc_tsan",
+                "build_helper",
+            ],
+        ),
+        ("core", &[]),
+        ("alloc", &[]),
+        ("collections", &[]),
+        ("libc", &[]),
+        ("panic_unwind", &[]),
+        ("proc_macro", &[]),
+        ("rustc_unicode", &[]),
+        ("std_unicode", &[]),
+        ("test", &[]),
+        // Feature gated
+        ("alloc_jemalloc", &[]),
+        ("alloc_system", &[]),
+        ("compiler_builtins", &[]),
+        ("getopts", &[]),
+        ("panic_unwind", &[]),
+        ("panic_abort", &[]),
+        ("rand", &[]),
+        ("term", &[]),
+        ("unwind", &[]),
+        // Dependencies
+        ("build_helper", &[]),
+        ("rustc_asan", &[]),
+        ("rustc_lsan", &[]),
+        ("rustc_msan", &[]),
+        ("rustc_tsan", &[]),
+        ("syntax", &[]),
+    ];
+
+    Ok(Sysroot {
+        crates: FxHashMap::default(),
+    })
+}
+
 fn find_cargo_toml(path: &Path) -> Result<PathBuf> {
     if path.ends_with("Cargo.toml") {
         return Ok(path.to_path_buf());
@@ -190,17 +290,3 @@ impl TargetKind {
         TargetKind::Other
     }
 }
-
-pub fn workspace_loader() -> (Worker<PathBuf, Result<CargoWorkspace>>, WorkerHandle) {
-    thread_worker::spawn::<PathBuf, Result<CargoWorkspace>, _>(
-        "workspace loader",
-        1,
-        |input_receiver, output_sender| {
-            input_receiver
-                .into_iter()
-                .map(|path| CargoWorkspace::from_cargo_metadata(path.as_path()))
-                .try_for_each(|it| output_sender.send(it))
-                .unwrap()
-        },
-    )
-}

crates/ra_lsp_server/src/server_world.rs

@@ -15,7 +15,7 @@ use parking_lot::RwLock;
 use failure::format_err;
 
 use crate::{
-    project_model::{CargoWorkspace, TargetKind},
+    project_model::{ProjectWorkspace, TargetKind},
     Result,
 };
 
@@ -23,26 +23,26 @@ use crate::{
 pub struct ServerWorldState {
     pub roots_to_scan: usize,
     pub root: PathBuf,
-    pub workspaces: Arc<Vec<CargoWorkspace>>,
+    pub workspaces: Arc<Vec<ProjectWorkspace>>,
     pub analysis_host: AnalysisHost,
     pub vfs: Arc<RwLock<Vfs>>,
 }
 
 pub struct ServerWorld {
-    pub workspaces: Arc<Vec<CargoWorkspace>>,
+    pub workspaces: Arc<Vec<ProjectWorkspace>>,
     pub analysis: Analysis,
     pub vfs: Arc<RwLock<Vfs>>,
 }
 
 impl ServerWorldState {
-    pub fn new(root: PathBuf, workspaces: Vec<CargoWorkspace>) -> ServerWorldState {
+    pub fn new(root: PathBuf, workspaces: Vec<ProjectWorkspace>) -> ServerWorldState {
         let mut change = AnalysisChange::new();
 
         let mut roots = Vec::new();
         roots.push(root.clone());
         for ws in workspaces.iter() {
-            for pkg in ws.packages() {
-                roots.push(pkg.root(&ws).to_path_buf());
+            for pkg in ws.cargo.packages() {
+                roots.push(pkg.root(&ws.cargo).to_path_buf());
             }
         }
         let roots_to_scan = roots.len();
@@ -56,13 +56,13 @@ impl ServerWorldState {
         let mut pkg_to_lib_crate = FxHashMap::default();
         let mut pkg_crates = FxHashMap::default();
         for ws in workspaces.iter() {
-            for pkg in ws.packages() {
-                for tgt in pkg.targets(ws) {
-                    let root = tgt.root(ws);
+            for pkg in ws.cargo.packages() {
+                for tgt in pkg.targets(&ws.cargo) {
+                    let root = tgt.root(&ws.cargo);
                     if let Some(file_id) = vfs.load(root) {
                         let file_id = FileId(file_id.0.into());
                         let crate_id = crate_graph.add_crate_root(file_id);
-                        if tgt.kind(ws) == TargetKind::Lib {
+                        if tgt.kind(&ws.cargo) == TargetKind::Lib {
                             pkg_to_lib_crate.insert(pkg, crate_id);
                         }
                         pkg_crates
@@ -72,8 +72,8 @@ impl ServerWorldState {
                     }
                 }
             }
-            for pkg in ws.packages() {
-                for dep in pkg.dependencies(ws) {
+            for pkg in ws.cargo.packages() {
+                for dep in pkg.dependencies(&ws.cargo) {
                     if let Some(&to) = pkg_to_lib_crate.get(&dep.pkg) {
                         for &from in pkg_crates.get(&pkg).into_iter().flatten() {
                             crate_graph.add_dep(from, dep.name.clone(), to);

crates/ra_lsp_server/tests/heavy_tests/main.rs

@@ -4,7 +4,7 @@ use languageserver_types::{
     CodeActionContext, DocumentFormattingParams, FormattingOptions, Position, Range,
 };
 use ra_lsp_server::req::{
-    CodeActionParams, CodeActionRequest, Formatting, Runnables, RunnablesParams,
+    CodeActionParams, CodeActionRequest, Formatting, Runnables, RunnablesParams, CompletionParams, Completion,
 };
 use serde_json::json;
 
@@ -12,6 +12,45 @@ use crate::support::project;
 
 const LOG: &'static str = "";
 
+#[test]
+fn completes_items_from_standard_library() {
+    let server = project(
+        r#"
+//- Cargo.toml
+[package]
+name = "foo"
+version = "0.0.0"
+
+//- src/lib.rs
+use std::collections::;
+"#,
+    );
+    server.wait_for_feedback("workspace loaded");
+    server.request::<Completion>(
+        CompletionParams {
+            text_document: server.doc_id("src/lib.rs"),
+            context: None,
+            position: Position::new(0, 22),
+        },
+        json!([
+          {
+            "filterText": "self",
+            "insertText": "self",
+            "insertTextFormat": 1,
+            "kind": 14,
+            "label": "self"
+          },
+          {
+            "filterText": "super",
+            "insertText": "super",
+            "insertTextFormat": 1,
+            "kind": 14,
+            "label": "super"
+          }
+        ]),
+    );
+}
+
 #[test]
 fn test_runnables_no_project() {
     let server = project(