5 files changed, 116 insertions, 22 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 53c2498f1..74a77ddc9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -913,20 +913,15 @@ dependencies = [
 name = "ra_batch"
 version = "0.1.0"
 dependencies = [
- "fst 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "insta 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "join_to_string 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ra_db 0.1.0",
  "ra_hir 0.1.0",
+ "ra_project_model 0.1.0",
  "ra_syntax 0.1.0",
- "rayon 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "relative-path 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ra_vfs 0.1.0",
  "rustc-hash 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "test_utils 0.1.0",
- "unicase 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
diff --git a/crates/ra_batch/Cargo.toml b/crates/ra_batch/Cargo.toml
index 3e83f8388..30a0749c7 100644
--- a/crates/ra_batch/Cargo.toml
+++ b/crates/ra_batch/Cargo.toml
@@ -5,20 +5,16 @@ version = "0.1.0"
 authors = ["Aleksey Kladov <[email protected]>"]
 
 [dependencies]
-itertools = "0.8.0"
-join_to_string = "0.1.3"
 log = "0.4.5"
-relative-path = "0.4.0"
-rayon = "1.0.2"
-fst = "0.3.1"
 rustc-hash = "1.0"
-parking_lot = "0.7.0"
-unicase = "2.2.0"
+
+failure = "0.1.4"
 
 ra_syntax = { path = "../ra_syntax" }
 ra_db = { path = "../ra_db" }
 ra_hir = { path = "../ra_hir" }
+ra_vfs = { path = "../ra_vfs" }
+ra_project_model = { path = "../ra_project_model" }
 
 [dev-dependencies]
 test_utils = { path = "../test_utils" }
-insta = "0.6.1"
diff --git a/crates/ra_batch/src/lib.rs b/crates/ra_batch/src/lib.rs
index 25f1f7357..ea91d88b7 100644
--- a/crates/ra_batch/src/lib.rs
+++ b/crates/ra_batch/src/lib.rs
@@ -1,9 +1,17 @@
 use std::sync::Arc;
+use std::path::Path;
+use std::collections::HashSet;
+
+use rustc_hash::FxHashMap;
 
 use ra_db::{
-    FilePosition, FileId, CrateGraph, SourceRoot, SourceRootId, SourceDatabase, salsa,
+    CrateGraph, FileId, SourceRoot, SourceRootId, SourceDatabase, salsa,
 };
 use ra_hir::{db, HirInterner};
+use ra_project_model::ProjectWorkspace;
+use ra_vfs::{Vfs, VfsChange};
+
+type Result<T> = std::result::Result<T, failure::Error>;
 
 #[salsa::database(
     ra_db::SourceDatabaseStorage,
@@ -11,10 +19,10 @@ use ra_hir::{db, HirInterner};
     db::PersistentHirDatabaseStorage
 )]
 #[derive(Debug)]
-pub(crate) struct BatchDatabase {
+pub struct BatchDatabase {
     runtime: salsa::Runtime<BatchDatabase>,
     interner: Arc<HirInterner>,
-    file_counter: u32,
+    // file_counter: u32,
 }
 
 impl salsa::Database for BatchDatabase {
@@ -28,3 +36,88 @@ impl AsRef<HirInterner> for BatchDatabase {
         &self.interner
     }
 }
+
+fn vfs_file_to_id(f: ra_vfs::VfsFile) -> FileId {
+    FileId(f.0.into())
+}
+fn vfs_root_to_id(r: ra_vfs::VfsRoot) -> SourceRootId {
+    SourceRootId(r.0.into())
+}
+
+impl BatchDatabase {
+    pub fn load(crate_graph: CrateGraph, vfs: &mut Vfs) -> BatchDatabase {
+        let mut db =
+            BatchDatabase { runtime: salsa::Runtime::default(), interner: Default::default() };
+        db.set_crate_graph(Arc::new(crate_graph));
+
+        // wait until Vfs has loaded all roots
+        let receiver = vfs.task_receiver().clone();
+        let mut roots_loaded = HashSet::new();
+        for task in receiver {
+            vfs.handle_task(task);
+            let mut done = false;
+            for change in vfs.commit_changes() {
+                match change {
+                    VfsChange::AddRoot { root, files } => {
+                        let source_root_id = vfs_root_to_id(root);
+                        log::debug!("loaded source root {:?} with path {:?}", source_root_id, vfs.root2path(root));
+                        let mut file_map = FxHashMap::default();
+                        for (vfs_file, path, text) in files {
+                            let file_id = vfs_file_to_id(vfs_file);
+                            db.set_file_text(file_id, text);
+                            db.set_file_relative_path(file_id, path.clone());
+                            db.set_file_source_root(file_id, source_root_id);
+                            file_map.insert(path, file_id);
+                        }
+                        let source_root = SourceRoot { files: file_map };
+                        db.set_source_root(source_root_id, Arc::new(source_root));
+                        roots_loaded.insert(source_root_id);
+                        if roots_loaded.len() == vfs.num_roots() {
+                            done = true;
+                        }
+                    }
+                    VfsChange::AddFile { .. }
+                    | VfsChange::RemoveFile { .. }
+                    | VfsChange::ChangeFile { .. } => {
+                        // log::warn!("VFS changed while loading");
+                    }
+                }
+            }
+            if done {
+                break;
+            }
+        }
+
+        db
+    }
+
+    pub fn load_cargo(root: impl AsRef<Path>) -> Result<(BatchDatabase, Vec<SourceRootId>)> {
+        let root = root.as_ref().canonicalize()?;
+        let ws = ProjectWorkspace::discover(root.as_ref())?;
+        let mut roots = Vec::new();
+        roots.push(root.clone());
+        for pkg in ws.cargo.packages() {
+            roots.push(pkg.root(&ws.cargo).to_path_buf());
+        }
+        for krate in ws.sysroot.crates() {
+            roots.push(krate.root_dir(&ws.sysroot).to_path_buf())
+        }
+        let (mut vfs, roots) = Vfs::new(roots);
+        let mut load = |path: &Path| {
+            let vfs_file = vfs.load(path);
+            log::debug!("vfs file {:?} -> {:?}", path, vfs_file);
+            vfs_file.map(vfs_file_to_id)
+        };
+        let crate_graph = ws.to_crate_graph(&mut load);
+        log::debug!("crate graph: {:?}", crate_graph);
+
+        let local_roots = roots.into_iter()
+            .filter(|r| vfs.root2path(*r).starts_with(&root))
+            .map(vfs_root_to_id)
+            .collect();
+
+        let db = BatchDatabase::load(crate_graph, &mut vfs);
+        let _ = vfs.shutdown();
+        Ok((db, local_roots))
+    }
+}
diff --git a/crates/ra_lsp_server/src/server_world.rs b/crates/ra_lsp_server/src/server_world.rs
index f97d240fa..4a68c019f 100644
--- a/crates/ra_lsp_server/src/server_world.rs
+++ b/crates/ra_lsp_server/src/server_world.rs
@@ -47,10 +47,8 @@ impl ServerWorldState {
                 roots.push(krate.root_dir(&ws.sysroot).to_path_buf())
             }
         }
-        roots.sort();
-        roots.dedup();
-        let roots_to_scan = roots.len();
         let (mut vfs, roots) = Vfs::new(roots);
+        let roots_to_scan = roots.len();
         for r in roots {
             let is_local = vfs.root2path(r).starts_with(&root);
             change.add_root(SourceRootId(r.0.into()), is_local);
diff --git a/crates/ra_vfs/src/lib.rs b/crates/ra_vfs/src/lib.rs
index 6b4eb6842..2d861f832 100644
--- a/crates/ra_vfs/src/lib.rs
+++ b/crates/ra_vfs/src/lib.rs
@@ -94,6 +94,7 @@ impl Roots {
         let mut roots = Arena::default();
         // A hack to make nesting work.
         paths.sort_by_key(|it| Reverse(it.as_os_str().len()));
+        paths.dedup();
         for (i, path) in paths.iter().enumerate() {
             let nested_roots = paths[..i]
                 .iter()
@@ -161,6 +162,13 @@ impl Vfs {
         self.roots[root].root.clone()
     }
 
+    pub fn path2root(&self, path: &Path) -> Option<VfsRoot> {
+        match self.find_root(path) {
+            Some((root, _path, _file)) => Some(root),
+            _ => None,
+        }
+    }
+
     pub fn path2file(&self, path: &Path) -> Option<VfsFile> {
         if let Some((_root, _path, Some(file))) = self.find_root(path) {
             return Some(file);
@@ -181,6 +189,10 @@ impl Vfs {
         None
     }
 
+    pub fn num_roots(&self) -> usize {
+        self.roots.len()
+    }
+
     pub fn load(&mut self, path: &Path) -> Option<VfsFile> {
         if let Some((root, rel_path, file)) = self.find_root(path) {
             return if let Some(file) = file {