5 files changed, 45 insertions, 8 deletions

diff --git a/crates/ra_batch/src/lib.rs b/crates/ra_batch/src/lib.rs
index 2c9645c00..7744ba85a 100644
--- a/crates/ra_batch/src/lib.rs
+++ b/crates/ra_batch/src/lib.rs
@@ -22,7 +22,7 @@ fn vfs_root_to_id(r: ra_vfs::VfsRoot) -> SourceRootId {
 
 pub fn load_cargo(root: &Path) -> Result<(AnalysisHost, FxHashMap<SourceRootId, PackageRoot>)> {
     let root = std::env::current_dir()?.join(root);
-    let ws = ProjectWorkspace::discover(root.as_ref())?;
+    let ws = ProjectWorkspace::discover(root.as_ref(), &Default::default())?;
     let project_roots = ws.to_roots();
     let (sender, receiver) = unbounded();
     let sender = Box::new(move |t| sender.send(t).unwrap());
diff --git a/crates/ra_lsp_server/src/config.rs b/crates/ra_lsp_server/src/config.rs
index 8045f3d60..67942aa41 100644
--- a/crates/ra_lsp_server/src/config.rs
+++ b/crates/ra_lsp_server/src/config.rs
@@ -9,6 +9,7 @@
 
 use rustc_hash::FxHashMap;
 
+use ra_project_model::CargoFeatures;
 use serde::{Deserialize, Deserializer};
 
 /// Client provided initialization options
@@ -37,6 +38,9 @@ pub struct ServerConfig {
 
     /// Fine grained feature flags to disable specific features.
     pub feature_flags: FxHashMap<String, bool>,
+
+    /// Cargo feature configurations.
+    pub cargo_features: CargoFeatures,
 }
 
 impl Default for ServerConfig {
@@ -49,6 +53,7 @@ impl Default for ServerConfig {
             max_inlay_hint_length: None,
             with_sysroot: true,
             feature_flags: FxHashMap::default(),
+            cargo_features: Default::default(),
         }
     }
 }
diff --git a/crates/ra_lsp_server/src/main_loop.rs b/crates/ra_lsp_server/src/main_loop.rs
index 158cac0be..965e7c53c 100644
--- a/crates/ra_lsp_server/src/main_loop.rs
+++ b/crates/ra_lsp_server/src/main_loop.rs
@@ -67,6 +67,7 @@ pub fn main_loop(
                 let workspace = ra_project_model::ProjectWorkspace::discover_with_sysroot(
                     ws_root.as_path(),
                     config.with_sysroot,
+                    &config.cargo_features,
                 );
                 match workspace {
                     Ok(workspace) => loaded_workspaces.push(workspace),
diff --git a/crates/ra_project_model/src/cargo_workspace.rs b/crates/ra_project_model/src/cargo_workspace.rs
index 351997dcd..4a0437da3 100644
--- a/crates/ra_project_model/src/cargo_workspace.rs
+++ b/crates/ra_project_model/src/cargo_workspace.rs
@@ -6,6 +6,7 @@ use cargo_metadata::{CargoOpt, MetadataCommand};
 use ra_arena::{impl_arena_id, Arena, RawId};
 use ra_db::Edition;
 use rustc_hash::FxHashMap;
+use serde::Deserialize;
 
 use crate::Result;
 
@@ -23,6 +24,20 @@ pub struct CargoWorkspace {
     pub(crate) workspace_root: PathBuf,
 }
 
+#[derive(Deserialize, Clone, Debug, PartialEq, Eq, Default)]
+#[serde(rename_all = "camelCase", default)]
+pub struct CargoFeatures {
+    /// Do not activate the `default` feature.
+    pub no_default_features: bool,
+
+    /// Activate all available features
+    pub all_features: bool,
+
+    /// List of features to activate.
+    /// This will be ignored if `cargo_all_features` is true.
+    pub features: Vec<String>,
+}
+
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub struct Package(RawId);
 impl_arena_id!(Package);
@@ -132,9 +147,21 @@ impl Target {
 }
 
 impl CargoWorkspace {
-    pub fn from_cargo_metadata(cargo_toml: &Path) -> Result<CargoWorkspace> {
+    pub fn from_cargo_metadata(
+        cargo_toml: &Path,
+        cargo_features: &CargoFeatures,
+    ) -> Result<CargoWorkspace> {
         let mut meta = MetadataCommand::new();
-        meta.manifest_path(cargo_toml).features(CargoOpt::AllFeatures);
+        meta.manifest_path(cargo_toml);
+        if cargo_features.all_features {
+            meta.features(CargoOpt::AllFeatures);
+        } else if cargo_features.no_default_features {
+            // FIXME: `NoDefaultFeatures` is mutual exclusive with `SomeFeatures`
+            // https://github.com/oli-obk/cargo_metadata/issues/79
+            meta.features(CargoOpt::NoDefaultFeatures);
+        } else {
+            meta.features(CargoOpt::SomeFeatures(cargo_features.features.clone()));
+        }
         if let Some(parent) = cargo_toml.parent() {
             meta.current_dir(parent);
         }
diff --git a/crates/ra_project_model/src/lib.rs b/crates/ra_project_model/src/lib.rs
index 55ff4d6ef..d71b7031a 100644
--- a/crates/ra_project_model/src/lib.rs
+++ b/crates/ra_project_model/src/lib.rs
@@ -18,7 +18,7 @@ use rustc_hash::FxHashMap;
 use serde_json::from_reader;
 
 pub use crate::{
-    cargo_workspace::{CargoWorkspace, Package, Target, TargetKind},
+    cargo_workspace::{CargoFeatures, CargoWorkspace, Package, Target, TargetKind},
     json_project::JsonProject,
     sysroot::Sysroot,
 };
@@ -60,11 +60,15 @@ impl PackageRoot {
 }
 
 impl ProjectWorkspace {
-    pub fn discover(path: &Path) -> Result<ProjectWorkspace> {
-        ProjectWorkspace::discover_with_sysroot(path, true)
+    pub fn discover(path: &Path, cargo_features: &CargoFeatures) -> Result<ProjectWorkspace> {
+        ProjectWorkspace::discover_with_sysroot(path, true, cargo_features)
     }
 
-    pub fn discover_with_sysroot(path: &Path, with_sysroot: bool) -> Result<ProjectWorkspace> {
+    pub fn discover_with_sysroot(
+        path: &Path,
+        with_sysroot: bool,
+        cargo_features: &CargoFeatures,
+    ) -> Result<ProjectWorkspace> {
         match find_rust_project_json(path) {
             Some(json_path) => {
                 let file = File::open(json_path)?;
@@ -73,7 +77,7 @@ impl ProjectWorkspace {
             }
             None => {
                 let cargo_toml = find_cargo_toml(path)?;
-                let cargo = CargoWorkspace::from_cargo_metadata(&cargo_toml)?;
+                let cargo = CargoWorkspace::from_cargo_metadata(&cargo_toml, cargo_features)?;
                 let sysroot =
                     if with_sysroot { Sysroot::discover(&cargo_toml)? } else { Sysroot::default() };
                 Ok(ProjectWorkspace::Cargo { cargo, sysroot })