Add toggle to disable cache priming

Author: lnicola

crates/rust-analyzer/src/config.rs

@@ -246,6 +246,9 @@ config_data! {
         /// `rust-project.json`, or JSON objects in `rust-project.json` format.
         linkedProjects: Vec<ManifestOrProjectJson> = "[]",
 
+        /// Pre-fill caches on project load.
+        load_prefillCaches: bool = "true",
+
         /// Number of syntax trees rust-analyzer keeps in memory. Defaults to 128.
         lruCapacity: Option<usize>                 = "null",
 
@@ -545,6 +548,10 @@ impl Config {
         )
     }
 
+    pub fn prefill_caches(&self) -> bool {
+        self.data.load_prefillCaches
+    }
+
     pub fn location_link(&self) -> bool {
         try_or!(self.caps.text_document.as_ref()?.definition?.link_support?, false)
     }

crates/rust-analyzer/src/main_loop.rs

@@ -433,7 +433,9 @@ impl GlobalState {
                 for flycheck in &self.flycheck {
                     flycheck.update();
                 }
-                self.prime_caches_queue.request_op();
+                if self.config.prefill_caches() {
+                    self.prime_caches_queue.request_op();
+                }
             }
 
             if !was_quiescent || state_changed {

docs/user/generated_config.adoc

@@ -389,6 +389,11 @@ of projects.
 Elements must be paths pointing to `Cargo.toml`,
 `rust-project.json`, or JSON objects in `rust-project.json` format.
 --
+[[rust-analyzer.load.prefillCaches]]rust-analyzer.load.prefillCaches (default: `true`)::
++
+--
+Pre-fill caches on project load.
+--
 [[rust-analyzer.lruCapacity]]rust-analyzer.lruCapacity (default: `null`)::
 +
 --

editors/code/package.json

@@ -828,6 +828,11 @@
                         ]
                     }
                 },
+                "rust-analyzer.load.prefillCaches": {
+                    "markdownDescription": "Pre-fill caches on project load.",
+                    "default": true,
+                    "type": "boolean"
+                },
                 "rust-analyzer.lruCapacity": {
                     "markdownDescription": "Number of syntax trees rust-analyzer keeps in memory. Defaults to 128.",
                     "default": null,