Add workspace_default_members field

Fixes #215

src/lib.rs

@@ -151,6 +151,10 @@ pub struct Metadata {
     pub packages: Vec<Package>,
     /// A list of all workspace members
     pub workspace_members: Vec<PackageId>,
+    /// A list of all workspace members
+    ///
+    /// This is always `None` if running with a version of Cargo older than 1.71.
+    pub workspace_default_members: Option<Vec<PackageId>>,
     /// Dependencies graph
     pub resolve: Option<Resolve>,
     /// Workspace root
@@ -190,6 +194,20 @@ impl Metadata {
             .filter(|&p| self.workspace_members.contains(&p.id))
             .collect()
     }
+
+    /// Get the workspace default packages.
+    ///
+    /// This will always return `None` if running with a version of Cargo older than 1.71.
+    pub fn workspace_default_packages(&self) -> Option<Vec<&Package>> {
+        self.workspace_default_members
+            .as_ref()
+            .map(|workspace_default_members| {
+                self.packages
+                    .iter()
+                    .filter(|&p| workspace_default_members.contains(&p.id))
+                    .collect()
+            })
+    }
 }
 
 impl<'a> std::ops::Index<&'a PackageId> for Metadata {

tests/selftest.rs

@@ -135,6 +135,9 @@ fn metadata_deps() {
     let workspace_packages = metadata.workspace_packages();
     assert_eq!(workspace_packages.len(), 1);
     assert_eq!(&workspace_packages[0].id, this_id);
+    if let Some(default_packages) = metadata.workspace_default_packages() {
+        assert_eq!(default_packages, workspace_packages);
+    }
 
     let lib = this
         .targets

tests/test_samples.rs

@@ -178,6 +178,7 @@ fn all_the_fields() {
         // path added in 1.51
         // default_run added in 1.55
         // rust_version added in 1.58
+        // workspace_default_members added in 1.71
         eprintln!("Skipping all_the_fields test, cargo {} is too old.", ver);
         return;
     }
@@ -196,6 +197,11 @@ fn all_the_fields() {
     );
     assert_eq!(meta.workspace_members.len(), 1);
     assert!(meta.workspace_members[0].to_string().starts_with("all"));
+    if ver >= semver::Version::parse("1.71.0").unwrap() {
+        assert_eq!(meta.workspace_default_members, Some(meta.workspace_members));
+    } else {
+        assert_eq!(meta.workspace_default_members, None);
+    }
 
     assert_eq!(meta.packages.len(), 9);
     let all = meta.packages.iter().find(|p| p.name == "all").unwrap();