Add path of workspace root folders to status output

Author: davidbarsky

crates/project-model/src/workspace.rs

@@ -450,6 +450,14 @@ impl ProjectWorkspace {
         }
     }
 
+    pub fn workspace_definition_path(&self) -> Option<&AbsPath> {
+        match self {
+            ProjectWorkspace::Cargo { cargo, .. } => Some(cargo.workspace_root()),
+            ProjectWorkspace::Json { project, .. } => Some(project.path()),
+            ProjectWorkspace::DetachedFiles { .. } => None,
+        }
+    }
+
     pub fn find_sysroot_proc_macro_srv(&self) -> Option<AbsPathBuf> {
         match self {
             ProjectWorkspace::Cargo { sysroot: Some(sysroot), .. }

crates/rust-analyzer/src/handlers.rs

@@ -29,7 +29,7 @@ use project_model::{ManifestPath, ProjectWorkspace, TargetKind};
 use serde_json::json;
 use stdx::{format_to, never};
 use syntax::{algo, ast, AstNode, TextRange, TextSize};
-use vfs::AbsPathBuf;
+use vfs::{AbsPath, AbsPathBuf};
 
 use crate::{
     cargo_target_spec::CargoTargetSpec,
@@ -84,6 +84,15 @@ pub(crate) fn handle_analyzer_status(
             snap.workspaces.len(),
             if snap.workspaces.len() == 1 { "" } else { "s" }
         );
+
+        format_to!(
+            buf,
+            "Workspace root folders: {:?}",
+            snap.workspaces
+                .iter()
+                .flat_map(|ws| ws.workspace_definition_path())
+                .collect::<Vec<&AbsPath>>()
+        );
     }
     buf.push_str("\nAnalysis:\n");
     buf.push_str(