8 files changed, 117 insertions, 111 deletions

diff --git a/crates/ra_db/src/fixture.rs b/crates/ra_db/src/fixture.rs
index 209713987..2aafb9965 100644
--- a/crates/ra_db/src/fixture.rs
+++ b/crates/ra_db/src/fixture.rs
@@ -222,7 +222,7 @@ impl From<Fixture> for FileMeta {
                 .edition
                 .as_ref()
                 .map_or(Edition::Edition2018, |v| Edition::from_str(&v).unwrap()),
-            env: Env::from(f.env.iter()),
+            env: f.env.into_iter().collect(),
         }
     }
 }
diff --git a/crates/ra_db/src/input.rs b/crates/ra_db/src/input.rs
index aaa492759..6f2e5cfc7 100644
--- a/crates/ra_db/src/input.rs
+++ b/crates/ra_db/src/input.rs
@@ -6,7 +6,7 @@
 //! actual IO. See `vfs` and `project_model` in the `rust-analyzer` crate for how
 //! actual IO is done and lowered to input.
 
-use std::{fmt, ops, str::FromStr, sync::Arc};
+use std::{fmt, iter::FromIterator, ops, str::FromStr, sync::Arc};
 
 use ra_cfg::CfgOptions;
 use ra_syntax::SmolStr;
@@ -298,18 +298,9 @@ impl fmt::Display for Edition {
     }
 }
 
-impl<'a, T> From<T> for Env
-where
-    T: Iterator<Item = (&'a String, &'a String)>,
-{
-    fn from(iter: T) -> Self {
-        let mut result = Self::default();
-
-        for (k, v) in iter {
-            result.entries.insert(k.to_owned(), v.to_owned());
-        }
-
-        result
+impl FromIterator<(String, String)> for Env {
+    fn from_iter<T: IntoIterator<Item = (String, String)>>(iter: T) -> Self {
+        Env { entries: FromIterator::from_iter(iter) }
     }
 }
 
diff --git a/crates/ra_ide/src/mock_analysis.rs b/crates/ra_ide/src/mock_analysis.rs
index b28054688..c7e0f4b58 100644
--- a/crates/ra_ide/src/mock_analysis.rs
+++ b/crates/ra_ide/src/mock_analysis.rs
@@ -2,7 +2,7 @@
 use std::sync::Arc;
 
 use ra_cfg::CfgOptions;
-use ra_db::{CrateName, Env, FileSet, SourceRoot, VfsPath};
+use ra_db::{CrateName, FileSet, SourceRoot, VfsPath};
 use test_utils::{
     extract_annotations, extract_range_or_offset, Fixture, RangeOrOffset, CURSOR_MARKER,
 };
@@ -110,7 +110,7 @@ impl MockAnalysis {
                 data.edition.and_then(|it| it.parse().ok()).unwrap_or(Edition::Edition2018);
 
             let file_id = FileId(i as u32 + 1);
-            let env = Env::from(data.env.iter());
+            let env = data.env.into_iter().collect();
             if path == "/lib.rs" || path == "/main.rs" {
                 root_crate = Some(crate_graph.add_crate_root(
                     file_id,
diff --git a/crates/ra_project_model/src/lib.rs b/crates/ra_project_model/src/lib.rs
index b9c5424bf..6da4d7928 100644
--- a/crates/ra_project_model/src/lib.rs
+++ b/crates/ra_project_model/src/lib.rs
@@ -7,7 +7,6 @@ mod sysroot;
 use std::{
     fs::{self, read_dir, ReadDir},
     io,
-    path::Path,
     process::{Command, Output},
 };
 
@@ -35,30 +34,12 @@ pub enum ProjectWorkspace {
 /// `PackageRoot` describes a package root folder.
 /// Which may be an external dependency, or a member of
 /// the current workspace.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Eq, PartialEq, Hash)]
 pub struct PackageRoot {
-    /// Path to the root folder
-    path: AbsPathBuf,
     /// Is a member of the current workspace
-    is_member: bool,
-    out_dir: Option<AbsPathBuf>,
-}
-impl PackageRoot {
-    pub fn new_member(path: AbsPathBuf) -> PackageRoot {
-        Self { path, is_member: true, out_dir: None }
-    }
-    pub fn new_non_member(path: AbsPathBuf) -> PackageRoot {
-        Self { path, is_member: false, out_dir: None }
-    }
-    pub fn path(&self) -> &AbsPath {
-        &self.path
-    }
-    pub fn out_dir(&self) -> Option<&AbsPath> {
-        self.out_dir.as_deref()
-    }
-    pub fn is_member(&self) -> bool {
-        self.is_member
-    }
+    pub is_member: bool,
+    pub include: Vec<AbsPathBuf>,
+    pub exclude: Vec<AbsPathBuf>,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash, Ord, PartialOrd)]
@@ -195,18 +176,40 @@ impl ProjectWorkspace {
     /// the root is a member of the current workspace
     pub fn to_roots(&self) -> Vec<PackageRoot> {
         match self {
-            ProjectWorkspace::Json { project } => {
-                project.roots.iter().map(|r| PackageRoot::new_member(r.path.clone())).collect()
-            }
+            ProjectWorkspace::Json { project } => project
+                .crates
+                .iter()
+                .map(|krate| PackageRoot {
+                    is_member: krate.is_workspace_member,
+                    include: krate.include.clone(),
+                    exclude: krate.exclude.clone(),
+                })
+                .collect::<FxHashSet<_>>()
+                .into_iter()
+                .collect::<Vec<_>>(),
             ProjectWorkspace::Cargo { cargo, sysroot } => cargo
                 .packages()
-                .map(|pkg| PackageRoot {
-                    path: cargo[pkg].root().to_path_buf(),
-                    is_member: cargo[pkg].is_member,
-                    out_dir: cargo[pkg].out_dir.clone(),
+                .map(|pkg| {
+                    let is_member = cargo[pkg].is_member;
+                    let pkg_root = cargo[pkg].root().to_path_buf();
+
+                    let mut include = vec![pkg_root.clone()];
+                    include.extend(cargo[pkg].out_dir.clone());
+
+                    let mut exclude = vec![pkg_root.join(".git")];
+                    if is_member {
+                        exclude.push(pkg_root.join("target"));
+                    } else {
+                        exclude.push(pkg_root.join("tests"));
+                        exclude.push(pkg_root.join("examples"));
+                        exclude.push(pkg_root.join("benches"));
+                    }
+                    PackageRoot { is_member, include, exclude }
                 })
-                .chain(sysroot.crates().map(|krate| {
-                    PackageRoot::new_non_member(sysroot[krate].root_dir().to_path_buf())
+                .chain(sysroot.crates().map(|krate| PackageRoot {
+                    is_member: false,
+                    include: vec![sysroot[krate].root_dir().to_path_buf()],
+                    exclude: Vec::new(),
                 }))
                 .collect(),
         }
@@ -255,13 +258,7 @@ impl ProjectWorkspace {
                         let file_path = &krate.root_module;
                         let file_id = load(&file_path)?;
 
-                        let mut env = Env::default();
-                        if let Some(out_dir) = &krate.out_dir {
-                            // NOTE: cargo and rustc seem to hide non-UTF-8 strings from env! and option_env!()
-                            if let Some(out_dir) = out_dir.to_str().map(|s| s.to_owned()) {
-                                env.set("OUT_DIR", out_dir);
-                            }
-                        }
+                        let env = krate.env.clone().into_iter().collect();
                         let proc_macro = krate
                             .proc_macro_dylib_path
                             .clone()
@@ -503,18 +500,6 @@ impl ProjectWorkspace {
         }
         crate_graph
     }
-
-    pub fn workspace_root_for(&self, path: &Path) -> Option<&AbsPath> {
-        match self {
-            ProjectWorkspace::Cargo { cargo, .. } => {
-                Some(cargo.workspace_root()).filter(|root| path.starts_with(root))
-            }
-            ProjectWorkspace::Json { project: ProjectJson { roots, .. }, .. } => roots
-                .iter()
-                .find(|root| path.starts_with(&root.path))
-                .map(|root| root.path.as_path()),
-        }
-    }
 }
 
 fn get_rustc_cfg_options(target: Option<&str>) -> CfgOptions {
diff --git a/crates/ra_project_model/src/project_json.rs b/crates/ra_project_model/src/project_json.rs
index 778cc84ef..e9a333191 100644
--- a/crates/ra_project_model/src/project_json.rs
+++ b/crates/ra_project_model/src/project_json.rs
@@ -5,24 +5,16 @@ use std::path::PathBuf;
 use paths::{AbsPath, AbsPathBuf};
 use ra_cfg::CfgOptions;
 use ra_db::{CrateId, CrateName, Dependency, Edition};
-use rustc_hash::FxHashSet;
+use rustc_hash::{FxHashMap, FxHashSet};
 use serde::{de, Deserialize};
 use stdx::split_delim;
 
 /// Roots and crates that compose this Rust project.
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct ProjectJson {
-    pub(crate) roots: Vec<Root>,
     pub(crate) crates: Vec<Crate>,
 }
 
-/// A root points to the directory which contains Rust crates. rust-analyzer watches all files in
-/// all roots. Roots might be nested.
-#[derive(Clone, Debug, Eq, PartialEq)]
-pub struct Root {
-    pub(crate) path: AbsPathBuf,
-}
-
 /// A crate points to the root module of a crate and lists the dependencies of the crate. This is
 /// useful in creating the crate graph.
 #[derive(Clone, Debug, Eq, PartialEq)]
@@ -32,15 +24,16 @@ pub struct Crate {
     pub(crate) deps: Vec<Dependency>,
     pub(crate) cfg: CfgOptions,
     pub(crate) target: Option<String>,
-    pub(crate) out_dir: Option<AbsPathBuf>,
+    pub(crate) env: FxHashMap<String, String>,
     pub(crate) proc_macro_dylib_path: Option<AbsPathBuf>,
     pub(crate) is_workspace_member: bool,
+    pub(crate) include: Vec<AbsPathBuf>,
+    pub(crate) exclude: Vec<AbsPathBuf>,
 }
 
 impl ProjectJson {
     pub fn new(base: &AbsPath, data: ProjectJsonData) -> ProjectJson {
         ProjectJson {
-            roots: data.roots.into_iter().map(|path| Root { path: base.join(path) }).collect(),
             crates: data
                 .crates
                 .into_iter()
@@ -50,8 +43,19 @@ impl ProjectJson {
                             && !crate_data.root_module.starts_with("..")
                             || crate_data.root_module.starts_with(base)
                     });
+                    let root_module = base.join(crate_data.root_module);
+                    let (include, exclude) = match crate_data.source {
+                        Some(src) => {
+                            let absolutize = |dirs: Vec<PathBuf>| {
+                                dirs.into_iter().map(|it| base.join(it)).collect::<Vec<_>>()
+                            };
+                            (absolutize(src.include_dirs), absolutize(src.exclude_dirs))
+                        }
+                        None => (vec![root_module.parent().unwrap().to_path_buf()], Vec::new()),
+                    };
+
                     Crate {
-                        root_module: base.join(crate_data.root_module),
+                        root_module,
                         edition: crate_data.edition.into(),
                         deps: crate_data
                             .deps
@@ -74,11 +78,13 @@ impl ProjectJson {
                             cfg
                         },
                         target: crate_data.target,
-                        out_dir: crate_data.out_dir.map(|it| base.join(it)),
+                        env: crate_data.env,
                         proc_macro_dylib_path: crate_data
                             .proc_macro_dylib_path
                             .map(|it| base.join(it)),
                         is_workspace_member,
+                        include,
+                        exclude,
                     }
                 })
                 .collect::<Vec<_>>(),
@@ -88,7 +94,6 @@ impl ProjectJson {
 
 #[derive(Deserialize)]
 pub struct ProjectJsonData {
-    roots: Vec<PathBuf>,
     crates: Vec<CrateData>,
 }
 
@@ -100,9 +105,11 @@ struct CrateData {
     #[serde(default)]
     cfg: FxHashSet<String>,
     target: Option<String>,
-    out_dir: Option<PathBuf>,
+    #[serde(default)]
+    env: FxHashMap<String, String>,
     proc_macro_dylib_path: Option<PathBuf>,
     is_workspace_member: Option<bool>,
+    source: Option<CrateSource>,
 }
 
 #[derive(Deserialize)]
@@ -132,6 +139,12 @@ struct DepData {
     name: CrateName,
 }
 
+#[derive(Deserialize)]
+struct CrateSource {
+    include_dirs: Vec<PathBuf>,
+    exclude_dirs: Vec<PathBuf>,
+}
+
 fn deserialize_crate_name<'de, D>(de: D) -> Result<CrateName, D::Error>
 where
     D: de::Deserializer<'de>,
diff --git a/crates/rust-analyzer/src/reload.rs b/crates/rust-analyzer/src/reload.rs
index d7ae00b07..1907f2f13 100644
--- a/crates/rust-analyzer/src/reload.rs
+++ b/crates/rust-analyzer/src/reload.rs
@@ -5,7 +5,7 @@ use flycheck::FlycheckHandle;
 use ra_db::{CrateGraph, SourceRoot, VfsPath};
 use ra_ide::AnalysisChange;
 use ra_prof::profile;
-use ra_project_model::{PackageRoot, ProcMacroClient, ProjectWorkspace};
+use ra_project_model::{ProcMacroClient, ProjectWorkspace};
 use vfs::{file_set::FileSetConfig, AbsPath, AbsPathBuf, ChangeKind};
 
 use crate::{
@@ -149,8 +149,10 @@ impl GlobalState {
                 watchers: workspaces
                     .iter()
                     .flat_map(ProjectWorkspace::to_roots)
-                    .filter(PackageRoot::is_member)
-                    .map(|root| format!("{}/**/*.rs", root.path().display()))
+                    .filter(|it| it.is_member)
+                    .flat_map(|root| {
+                        root.include.into_iter().map(|it| format!("{}/**/*.rs", it.display()))
+                    })
                     .map(|glob_pattern| lsp_types::FileSystemWatcher { glob_pattern, kind: None })
                     .collect(),
             };
@@ -261,31 +263,23 @@ impl ProjectFolders {
         let mut local_filesets = vec![];
 
         for root in workspaces.iter().flat_map(|it| it.to_roots()) {
-            let path = root.path().to_owned();
-
-            let mut file_set_roots: Vec<VfsPath> = vec![];
+            let file_set_roots: Vec<VfsPath> =
+                root.include.iter().cloned().map(VfsPath::from).collect();
 
-            let entry = if root.is_member() {
-                vfs::loader::Entry::local_cargo_package(path.to_path_buf())
-            } else {
-                vfs::loader::Entry::cargo_package_dependency(path.to_path_buf())
+            let entry = {
+                let mut dirs = vfs::loader::Directories::default();
+                dirs.extensions.push("rs".into());
+                dirs.include.extend(root.include);
+                dirs.exclude.extend(root.exclude);
+                vfs::loader::Entry::Directories(dirs)
             };
-            res.load.push(entry);
-            if root.is_member() {
-                res.watch.push(res.load.len() - 1);
-            }
 
-            if let Some(out_dir) = root.out_dir() {
-                let out_dir = out_dir.to_path_buf();
-                res.load.push(vfs::loader::Entry::rs_files_recursively(out_dir.clone()));
-                if root.is_member() {
-                    res.watch.push(res.load.len() - 1);
-                }
-                file_set_roots.push(out_dir.into());
+            if root.is_member {
+                res.watch.push(res.load.len());
             }
-            file_set_roots.push(path.to_path_buf().into());
+            res.load.push(entry);
 
-            if root.is_member() {
+            if root.is_member {
                 local_filesets.push(fsc.len());
             }
             fsc.add_file_set(file_set_roots)
diff --git a/crates/vfs/src/loader.rs b/crates/vfs/src/loader.rs
index 04e257f53..40cf96020 100644
--- a/crates/vfs/src/loader.rs
+++ b/crates/vfs/src/loader.rs
@@ -17,7 +17,7 @@ pub enum Entry {
 ///   * it is not under `exclude` path
 ///
 /// If many include/exclude paths match, the longest one wins.
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Default)]
 pub struct Directories {
     pub extensions: Vec<String>,
     pub include: Vec<AbsPathBuf>,
diff --git a/docs/user/manual.adoc b/docs/user/manual.adoc
index 57251b851..4b31145de 100644
--- a/docs/user/manual.adoc
+++ b/docs/user/manual.adoc
@@ -273,9 +273,6 @@ However, if you use some other build system, you'll have to describe the structu
 [source,TypeScript]
 ----
 interface JsonProject {
-   /// The set of paths containing the crates for this project.
-   /// Any `Crate` must be nested inside some `root`.
-   roots: string[];
    /// The set of crates comprising the current project.
    /// Must include all transitive dependencies as well as sysroot crate (libstd, libcore and such).
    crates: Crate[];
@@ -288,11 +285,37 @@ interface Crate {
     edition: "2015" | "2018";
     /// Dependencies
     deps: Dep[];
+    /// Should this crate be treated as a member of current "workspace".
+    ///
+    /// By default, inferred from the `root_module` (members are the crates which reside
+    /// inside the directory opened in the editor).
+    ///
+    /// Set this to `false` for things like standard library and 3rd party crates to
+    /// enable performance optimizations (rust-analyzer assumes that non-member crates
+    /// don't change).
+    is_workspace_member?: boolean;
+    /// Optionally specify the (super)set of `.rs` files comprising this crate.
+    ///
+    /// By default, rust-analyzer assumes that only files under `root_module.parent` can belong to a crate.
+    /// `include_dirs` are included recursively, unless a subdirectory is in `exclude_dirs`.
+    ///
+    /// Different crates can share the same `source`.
+
+    /// If two crates share an `.rs` file in common, they *must* have the same `source`.
+    /// rust-analyzer assumes that files from one source can't refer to files in another source.
+    source?: {
+        include_dirs: string[],
+        exclude_dirs: string[],
+    },
     /// The set of cfgs activated for a given crate, like `["unix", "feature=foo", "feature=bar"]`.
     cfg: string[];
+    /// Target triple for this Crate.
+    ///
+    /// Used when running `rustc --print cfg` to get target-specific cfgs.
+    target?: string;
+    /// Environment variables, used for the `env!` macro
+    env: : { [key: string]: string; },
 
-    /// value of the OUT_DIR env variable.
-    out_dir?: string;
     /// For proc-macro crates, path to compiles proc-macro (.so file).
     proc_macro_dylib_path?: string;
 }