2 files changed, 26 insertions, 10 deletions

diff --git a/crates/ra_analysis/src/db.rs b/crates/ra_analysis/src/db.rs
index 1709be5cf..9d46609ec 100644
--- a/crates/ra_analysis/src/db.rs
+++ b/crates/ra_analysis/src/db.rs
@@ -1,10 +1,9 @@
 use std::{fmt, sync::Arc};
+
 use salsa::{self, Database};
-use ra_db::{LocationIntener, BaseDatabase};
+use ra_db::{LocationIntener, BaseDatabase, FileId};
 
-use crate::{
-    symbol_index,
-};
+use crate::{symbol_index, LineIndex};
 
 #[derive(Debug)]
 pub(crate) struct RootDatabase {
@@ -71,6 +70,19 @@ impl AsRef<LocationIntener<hir::MacroCallLoc, hir::MacroCallId>> for RootDatabas
     }
 }
 
+salsa::query_group! {
+    pub(crate) trait LineIndexDatabase: ra_db::FilesDatabase + BaseDatabase {
+        fn line_index(file_id: FileId) -> Arc<LineIndex> {
+            type LineIndexQuery;
+        }
+    }
+}
+
+fn line_index(db: &impl ra_db::FilesDatabase, file_id: FileId) -> Arc<LineIndex> {
+    let text = db.file_text(file_id);
+    Arc::new(LineIndex::new(&*text))
+}
+
 salsa::database_storage! {
     pub(crate) struct RootDatabaseStorage for RootDatabase {
         impl ra_db::FilesDatabase {
@@ -84,7 +96,9 @@ salsa::database_storage! {
         }
         impl ra_db::SyntaxDatabase {
             fn source_file() for ra_db::SourceFileQuery;
-            fn file_lines() for ra_db::FileLinesQuery;
+        }
+        impl LineIndexDatabase {
+            fn line_index() for LineIndexQuery;
         }
         impl symbol_index::SymbolsDatabase {
             fn file_symbols() for symbol_index::FileSymbolsQuery;
diff --git a/crates/ra_analysis/src/lib.rs b/crates/ra_analysis/src/lib.rs
index a3b350ad7..48df08416 100644
--- a/crates/ra_analysis/src/lib.rs
+++ b/crates/ra_analysis/src/lib.rs
@@ -29,12 +29,16 @@ use std::{fmt, sync::Arc};
 
 use ra_syntax::{SmolStr, SourceFile, TreePtr, SyntaxKind, TextRange, TextUnit};
 use ra_text_edit::TextEdit;
+use ra_db::{SyntaxDatabase, FilesDatabase, LocalSyntaxPtr};
 use rayon::prelude::*;
 use relative_path::RelativePathBuf;
 use rustc_hash::FxHashMap;
 use salsa::ParallelDatabase;
 
-use crate::symbol_index::{FileSymbol, SymbolIndex};
+use crate::{
+    symbol_index::{FileSymbol, SymbolIndex},
+    db::LineIndexDatabase,
+};
 
 pub use crate::{
     completion::{CompletionItem, CompletionItemKind, InsertText},
@@ -44,10 +48,8 @@ pub use ra_editor::{
     Fold, FoldKind, HighlightedRange, Severity, StructureNode,
     LineIndex, LineCol, translate_offset_with_edit,
 };
-
 pub use ra_db::{
-    Cancelable, Canceled, CrateGraph, CrateId, FileId, FilePosition, FileRange, FilesDatabase,
-    LocalSyntaxPtr, SourceRootId, SyntaxDatabase,
+    Cancelable, Canceled, CrateGraph, CrateId, FileId, FilePosition, FileRange, SourceRootId
 };
 
 #[derive(Default)]
@@ -325,7 +327,7 @@ impl Analysis {
     /// Gets the file's `LineIndex`: data structure to convert between absolute
     /// offsets and line/column representation.
     pub fn file_line_index(&self, file_id: FileId) -> Arc<LineIndex> {
-        self.db.file_lines(file_id)
+        self.db.line_index(file_id)
     }
     /// Selects the next syntactic nodes encopasing the range.
     pub fn extend_selection(&self, frange: FileRange) -> TextRange {