fix: Fix formatting requests hanging when r-a is still starting

The reason for that was that we were calculating the crate defmaps
of the file we are saving by accident causing us to get stuck waiting
on their expensive computation, while we only need the relevant crate
id.

crates/ide/src/lib.rs

@@ -482,8 +482,8 @@ impl Analysis {
     }
 
     /// Returns crates this file belongs too.
-    pub fn crate_for(&self, file_id: FileId) -> Cancellable<Vec<CrateId>> {
-        self.with_db(|db| parent_module::crate_for(db, file_id))
+    pub fn crates_for(&self, file_id: FileId) -> Cancellable<Vec<CrateId>> {
+        self.with_db(|db| parent_module::crates_for(db, file_id))
     }
 
     /// Returns the edition of the given crate.

crates/ide/src/parent_module.rs

@@ -1,9 +1,8 @@
 use hir::Semantics;
 use ide_db::{
-    base_db::{CrateId, FileId, FilePosition},
+    base_db::{CrateId, FileId, FileLoader, FilePosition},
     RootDatabase,
 };
-use itertools::Itertools;
 use syntax::{
     algo::find_node_at_offset,
     ast::{self, AstNode},
@@ -55,9 +54,8 @@ pub(crate) fn parent_module(db: &RootDatabase, position: FilePosition) -> Vec<Na
 }
 
 /// Returns `Vec` for the same reason as `parent_module`
-pub(crate) fn crate_for(db: &RootDatabase, file_id: FileId) -> Vec<CrateId> {
-    let sema = Semantics::new(db);
-    sema.to_module_defs(file_id).map(|module| module.krate().into()).unique().collect()
+pub(crate) fn crates_for(db: &RootDatabase, file_id: FileId) -> Vec<CrateId> {
+    db.relevant_crates(file_id).iter().copied().collect()
 }
 
 #[cfg(test)]
@@ -147,7 +145,7 @@ $0
 mod foo;
 "#,
         );
-        assert_eq!(analysis.crate_for(file_id).unwrap().len(), 1);
+        assert_eq!(analysis.crates_for(file_id).unwrap().len(), 1);
     }
 
     #[test]
@@ -162,6 +160,6 @@ mod baz;
 mod baz;
 "#,
         );
-        assert_eq!(analysis.crate_for(file_id).unwrap().len(), 2);
+        assert_eq!(analysis.crates_for(file_id).unwrap().len(), 2);
     }
 }

crates/ide/src/status.rs

@@ -45,7 +45,7 @@ pub(crate) fn status(db: &RootDatabase, file_id: Option<FileId>) -> String {
 
     if let Some(file_id) = file_id {
         format_to!(buf, "\nFile info:\n");
-        let crates = crate::parent_module::crate_for(db, file_id);
+        let crates = crate::parent_module::crates_for(db, file_id);
         if crates.is_empty() {
             format_to!(buf, "Does not belong to any crate");
         }

crates/rust-analyzer/src/cargo_target_spec.rs

@@ -118,11 +118,7 @@ impl CargoTargetSpec {
         global_state_snapshot: &GlobalStateSnapshot,
         file_id: FileId,
     ) -> Result<Option<CargoTargetSpec>> {
-        let crate_id = match &*global_state_snapshot.analysis.crate_for(file_id)? {
-            &[crate_id, ..] => crate_id,
-            _ => return Ok(None),
-        };
-        let (cargo_ws, target) = match global_state_snapshot.cargo_target_for_crate_root(crate_id) {
+        let (cargo_ws, target) = match global_state_snapshot.cargo_target_for_file_id(file_id) {
             Some(it) => it,
             None => return Ok(None),
         };

crates/rust-analyzer/src/dispatch.rs

@@ -52,7 +52,7 @@ impl<'a> RequestDispatcher<'a> {
             let _pctx = stdx::panic_context::enter(panic_context);
             f(self.global_state, params)
         };
-        if let Ok(response) = result_to_response::<R>(req.id.clone(), result) {
+        if let Ok(response) = result_to_response::<R>(req.id, result) {
             self.global_state.respond(response);
         }
 
@@ -80,7 +80,7 @@ impl<'a> RequestDispatcher<'a> {
             f(global_state_snapshot, params)
         });
 
-        if let Ok(response) = thread_result_to_response::<R>(req.id.clone(), result) {
+        if let Ok(response) = thread_result_to_response::<R>(req.id, result) {
             self.global_state.respond(response);
         }
 

crates/rust-analyzer/src/global_state.rs

@@ -8,7 +8,7 @@ use std::{sync::Arc, time::Instant};
 use crossbeam_channel::{unbounded, Receiver, Sender};
 use flycheck::FlycheckHandle;
 use ide::{Analysis, AnalysisHost, Cancellable, Change, FileId};
-use ide_db::base_db::{CrateId, FileLoader, SourceDatabase};
+use ide_db::base_db::{FileLoader, SourceDatabase};
 use lsp_types::{SemanticTokens, Url};
 use parking_lot::{Mutex, RwLock};
 use proc_macro_api::ProcMacroServer;
@@ -398,11 +398,10 @@ impl GlobalStateSnapshot {
         url_from_abs_path(path)
     }
 
-    pub(crate) fn cargo_target_for_crate_root(
+    pub(crate) fn cargo_target_for_file_id(
         &self,
-        crate_id: CrateId,
+        file_id: FileId,
     ) -> Option<(&CargoWorkspace, Target)> {
-        let file_id = self.analysis.crate_root(crate_id).ok()?;
         let path = self.vfs.read().0.file_path(file_id);
         let path = path.as_path()?;
         self.workspaces.iter().find_map(|ws| match ws {

crates/rust-analyzer/src/handlers.rs

@@ -658,7 +658,7 @@ pub(crate) fn handle_parent_module(
 
         // check if invoked at the crate root
         let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
-        let crate_id = match snap.analysis.crate_for(file_id)?.first() {
+        let crate_id = match snap.analysis.crates_for(file_id)?.first() {
             Some(&crate_id) => crate_id,
             None => return Ok(None),
         };
@@ -1782,7 +1782,7 @@ fn run_rustfmt(
 ) -> Result<Option<Vec<lsp_types::TextEdit>>> {
     let file_id = from_proto::file_id(snap, &text_document.uri)?;
     let file = snap.analysis.file_text(file_id)?;
-    let crate_ids = snap.analysis.crate_for(file_id)?;
+    let crate_ids = snap.analysis.crates_for(file_id)?;
 
     let line_index = snap.file_line_index(file_id)?;
 

crates/rust-analyzer/src/main_loop.rs

@@ -767,7 +767,7 @@ impl GlobalState {
                         let analysis = this.analysis_host.analysis();
                         // Crates containing or depending on the saved file
                         let crate_ids: Vec<_> = analysis
-                            .crate_for(file_id)?
+                            .crates_for(file_id)?
                             .into_iter()
                             .flat_map(|id| {
                                 this.analysis_host