Merge #5969

5969: Propose module name completion options r=jonas-schievink a=SomeoneToIgnore

<img width="539" alt="image" src="https://user-images.githubusercontent.com/2690773/92663009-cb0aec00-f308-11ea-9ef5-1faa91518031.png">

Currently traverses the whole file set every time we try to complete the module, as discussed in https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Fwg-rls-2.2E0/topic/mod.3C.7C.3E.20completion

Co-authored-by: Kirill Bulatov <[email protected]>

1 files changed, 7 insertions, 1 deletions

diff --git a/crates/base_db/src/input.rs b/crates/base_db/src/input.rs
index f3d65cdf0..9a61f1d56 100644
--- a/crates/base_db/src/input.rs
+++ b/crates/base_db/src/input.rs
@@ -12,7 +12,7 @@ use cfg::CfgOptions;
 use rustc_hash::{FxHashMap, FxHashSet};
 use syntax::SmolStr;
 use tt::TokenExpander;
-use vfs::file_set::FileSet;
+use vfs::{file_set::FileSet, VfsPath};
 
 pub use vfs::FileId;
 
@@ -43,6 +43,12 @@ impl SourceRoot {
     pub fn new_library(file_set: FileSet) -> SourceRoot {
         SourceRoot { is_library: true, file_set }
     }
+    pub fn path_for_file(&self, file: &FileId) -> Option<&VfsPath> {
+        self.file_set.path_for_file(file)
+    }
+    pub fn file_for_path(&self, path: &VfsPath) -> Option<&FileId> {
+        self.file_set.file_for_path(path)
+    }
     pub fn iter(&self) -> impl Iterator<Item = FileId> + '_ {
         self.file_set.iter()
     }