Prime open files on load

1 files changed, 15 insertions, 0 deletions

diff --git a/crates/ra_ide/src/prime_caches.rs b/crates/ra_ide/src/prime_caches.rs
new file mode 100644
index 000000000..628c989bf
--- /dev/null
+++ b/crates/ra_ide/src/prime_caches.rs
@@ -0,0 +1,15 @@
+//! rust-analyzer is lazy and doesn't not compute anything unless asked. This
+//! sometimes is counter productive when, for example, the first goto definition
+//! request takes longer to compute. This modules implemented prepopulating of
+//! various caches, it's not really advanced at the moment.
+
+use hir::Semantics;
+
+use crate::{FileId, RootDatabase};
+
+pub(crate) fn prime_caches(db: &RootDatabase, files: Vec<FileId>) {
+    let sema = Semantics::new(db);
+    for file in files {
+        let _ = sema.to_module_def(file);
+    }
+}