Getting cargo workspace from file_id and refactoring

crates/ide/src/doc_links.rs

@@ -133,7 +133,7 @@ pub(crate) fn external_docs(
     db: &RootDatabase,
     position: &FilePosition,
     target_dir: Option<&OsStr>,
-) -> DocumentationLinks {
+) -> Option<DocumentationLinks> {
     let sema = &Semantics::new(db);
     let file = sema.parse(position.file_id).syntax().clone();
     let token = pick_best_token(file.token_at_offset(position.offset), |kind| match kind {
@@ -141,11 +141,10 @@ pub(crate) fn external_docs(
         T!['('] | T![')'] => 2,
         kind if kind.is_trivia() => 0,
         _ => 1,
-    });
+    })?;
-    let Some(token) = token else { return Default::default() };
     let token = sema.descend_into_macros_single(token);
 
-    let Some(node) = token.parent() else { return Default::default() };
+    let node = token.parent()?;
     let definition = match_ast! {
         match node {
             ast::NameRef(name_ref) => match NameRefClass::classify(sema, &name_ref) {
@@ -153,18 +152,18 @@ pub(crate) fn external_docs(
                 Some(NameRefClass::FieldShorthand { local_ref: _, field_ref }) => {
                     Definition::Field(field_ref)
                 }
-                None => return Default::default(),
+                None => return None,
             },
             ast::Name(name) => match NameClass::classify(sema, &name) {
                 Some(NameClass::Definition(it) | NameClass::ConstReference(it)) => it,
                 Some(NameClass::PatFieldShorthand { local_def: _, field_ref }) => Definition::Field(field_ref),
-                None => return Default::default(),
+                None => return None,
             },
-            _ => return Default::default(),
+            _ => return None
         }
     };
 
-    get_doc_links(db, definition, target_dir)
+    Some(get_doc_links(db, definition, target_dir))
 }
 
 /// Extracts all links from a given markdown text returning the definition text range, link-text
@@ -327,6 +326,10 @@ fn get_doc_links(
     def: Definition,
     target_dir: Option<&OsStr>,
 ) -> DocumentationLinks {
+    let join_url = |base_url: Option<Url>, path: &str| -> Option<Url> {
+        base_url.and_then(|url| url.join(path).ok())
+    };
+
     let Some((target, file, frag)) = filename_and_frag_for_def(db, def) else { return Default::default(); };
 
     let (mut web_url, mut local_url) = get_doc_base_urls(db, target, target_dir);
@@ -339,21 +342,13 @@ fn get_doc_links(
     web_url = join_url(web_url, &file);
     local_url = join_url(local_url, &file);
 
-    set_fragment_for_url(web_url.as_mut(), frag.as_deref());
+    web_url.as_mut().map(|url| url.set_fragment(frag.as_deref()));
-    set_fragment_for_url(local_url.as_mut(), frag.as_deref());
+    local_url.as_mut().map(|url| url.set_fragment(frag.as_deref()));
 
     return DocumentationLinks {
         web_url: web_url.map(|it| it.into()),
         local_url: local_url.map(|it| it.into()),
     };
-
-    fn join_url(base_url: Option<Url>, path: &str) -> Option<Url> {
-        base_url.and_then(|url| url.join(path).ok())
-    }
-
-    fn set_fragment_for_url(url: Option<&mut Url>, frag: Option<&str>) {
-        url.map(|url| url.set_fragment(frag));
-    }
 }
 
 fn rewrite_intra_doc_link(
@@ -467,8 +462,14 @@ fn get_doc_base_urls(
     def: Definition,
     target_dir: Option<&OsStr>,
 ) -> (Option<Url>, Option<Url>) {
-    let local_doc_path =
+    let local_doc_path = target_dir
-        target_dir.and_then(create_url_from_os_str).and_then(|it| it.join("doc/").ok());
+        .and_then(|path: &OsStr| -> Option<Url> {
+            let mut with_prefix = OsStr::new("file:///").to_os_string();
+            with_prefix.push(path);
+            with_prefix.push("/");
+            with_prefix.to_str().and_then(|s| Url::parse(s).ok())
+        })
+        .and_then(|it| it.join("doc/").ok());
     // special case base url of `BuiltinType` to core
     // https://github.com/rust-lang/rust-analyzer/issues/12250
     if let Definition::BuiltinType(..) = def {
@@ -533,14 +534,7 @@ fn get_doc_base_urls(
         .and_then(|it| it.join(&format!("{display_name}/")).ok());
     let local_base = local_base.and_then(|it| it.join(&format!("{display_name}/")).ok());
 
-    return (web_base, local_base);
+    (web_base, local_base)
-
-    fn create_url_from_os_str(path: &OsStr) -> Option<Url> {
-        let mut with_prefix = OsStr::new("file:///").to_os_string();
-        with_prefix.push(path);
-        with_prefix.push("/");
-        with_prefix.to_str().and_then(|s| Url::parse(s).ok())
-    }
 }
 
 /// Get the filename and extension generated for a symbol by rustdoc.

crates/ide/src/lib.rs

@@ -476,7 +476,7 @@ impl Analysis {
         position: FilePosition,
         target_dir: Option<&OsStr>,
     ) -> Cancellable<doc_links::DocumentationLinks> {
-        self.with_db(|db| doc_links::external_docs(db, &position, target_dir))
+        self.with_db(|db| doc_links::external_docs(db, &position, target_dir).unwrap_or_default())
     }
 
     /// Computes parameter information at the given position.

crates/rust-analyzer/src/handlers/request.rs

@@ -1537,14 +1537,16 @@ pub(crate) fn handle_open_docs(
     params: lsp_types::TextDocumentPositionParams,
 ) -> Result<(Option<lsp_types::Url>, Option<lsp_types::Url>)> {
     let _p = profile::span("handle_open_docs");
+    let file_uri = &params.text_document.uri;
+    let file_id = from_proto::file_id(&snap, file_uri)?;
     let position = from_proto::file_position(&snap, params)?;
 
-    let cargo = match snap.workspaces.get(0) {
+    let cargo = match &*snap.analysis.crates_for(file_id)? {
-        Some(ProjectWorkspace::Cargo { cargo, .. }) => Some(cargo),
+        &[crate_id, ..] => snap.cargo_target_for_crate_root(crate_id).map(|(it, _)| it),
         _ => None,
     };
-    let target_dir =
+
-        cargo.and_then(|cargo| Some(cargo.target_directory())).and_then(|p| Some(p.as_os_str()));
+    let target_dir = cargo.map(|cargo| cargo.target_directory()).map(|p| p.as_os_str());
     let Ok(remote_urls) = snap.analysis.external_docs(position, target_dir) else { return Ok((None, None)); };
 
     let web_url = remote_urls.web_url.and_then(|it| Url::parse(&it).ok());