From 44c8ddf885daaecfa4785e100ac1b065126c05b7 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Wed, 24 Oct 2018 16:13:17 +0300
Subject: make indexing parallel again

---
 crates/ra_analysis/src/roots.rs        | 5 +++--
 crates/ra_analysis/src/symbol_index.rs | 4 ++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/crates/ra_analysis/src/roots.rs b/crates/ra_analysis/src/roots.rs
index 7100f7c71..15081f555 100644
--- a/crates/ra_analysis/src/roots.rs
+++ b/crates/ra_analysis/src/roots.rs
@@ -3,6 +3,7 @@ use std::{sync::Arc};
 use ra_editor::LineIndex;
 use ra_syntax::File;
 use rustc_hash::FxHashSet;
+use rayon::prelude::*;
 use salsa::Database;
 
 use crate::{
@@ -105,8 +106,8 @@ impl ReadonlySourceRoot {
             .set((), Arc::new(db::FileSet { files: file_ids, resolver }));
         let file_set = db.file_set();
         let symbol_index =
-            SymbolIndex::for_files(file_set.files.iter() // TODO: par iter
-                .map(|&file_id| (file_id, db.file_syntax(file_id))));
+            SymbolIndex::for_files(file_set.files.par_iter()
+                .map_with(db.clone(), |db, &file_id| (file_id, db.file_syntax(file_id))));
 
         ReadonlySourceRoot { db, symbol_index: Arc::new(symbol_index) }
     }
diff --git a/crates/ra_analysis/src/symbol_index.rs b/crates/ra_analysis/src/symbol_index.rs
index 1b7d9f779..e5c8d8870 100644
--- a/crates/ra_analysis/src/symbol_index.rs
+++ b/crates/ra_analysis/src/symbol_index.rs
@@ -34,7 +34,7 @@ impl Hash for SymbolIndex {
 }
 
 impl SymbolIndex {
-    pub(crate) fn for_files(files: impl Iterator<Item = (FileId, File)>) -> SymbolIndex {
+    pub(crate) fn for_files(files: impl ParallelIterator<Item = (FileId, File)>) -> SymbolIndex {
         let mut symbols = files
             .flat_map(|(file_id, file)| {
                 file_symbols(&file)
@@ -52,7 +52,7 @@ impl SymbolIndex {
     }
 
     pub(crate) fn for_file(file_id: FileId, file: File) -> SymbolIndex {
-        SymbolIndex::for_files(::std::iter::once((file_id, file)))
+        SymbolIndex::for_files(rayon::iter::once((file_id, file)))
     }
 }
 
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