Support workspace deps in the root crate of a workspace

src/lib.rs

@@ -269,9 +269,9 @@ fn read_cargo_toml(
 
     let workspace_dependencies = if manifest_path != workspace_manifest_path {
         let workspace_manifest = open_cargo_toml(workspace_manifest_path)?;
-        extract_workspace_dependencies(workspace_manifest)?
+        extract_workspace_dependencies(&workspace_manifest)?
     } else {
-        Default::default()
+        extract_workspace_dependencies(&manifest)?
     };
 
     let crate_names = extract_crate_names(&manifest, workspace_dependencies)?;
@@ -289,7 +289,7 @@ fn read_cargo_toml(
 /// Returns a hash map that maps from dep name to the package name. Dep name
 /// and package name can be the same if there doesn't exist any rename.
 fn extract_workspace_dependencies(
-    workspace_toml: Document,
+    workspace_toml: &Document,
 ) -> Result<BTreeMap<String, String>, Error> {
     Ok(workspace_dep_tables(&workspace_toml)
         .into_iter()
@@ -352,7 +352,7 @@ fn extract_crate_names(
         let workspace = dep_value.get("workspace").and_then(|w| w.as_bool()).unwrap_or_default();
 
         let pkg_name = workspace
-            .then(|| workspace_dependencies.get(pkg_name).map(|p| p.as_ref()))
+            .then(|| workspace_dependencies.get(dep_name).map(|p| p.as_ref()))
             .flatten()
             .unwrap_or(pkg_name);