Add --workspace and friends to cargo-msrv cli

Cargo.toml

@@ -23,6 +23,7 @@ bisector = "0.4.0" # bisection with a custom comparator
 camino = "1.1" # utf-8 paths
 cargo_metadata = "0.18.1" # resolving Cargo manifest metadata (consider `guppy`!)
 clap = { version = "4.5.20", features = ["derive"] } # parse CLI arguments
+clap-cargo = { version = "0.14.1", features = ["cargo_metadata"] }
 dirs = "5.0.1" # common directories
 indicatif = "0.17.8" # UI
 once_cell = "1.20.2" # lazy data structures and thunking

src/cli/shared_opts.rs

@@ -15,6 +15,9 @@ pub struct SharedOpts {
     #[arg(long, value_name = "Cargo Manifest", global = true, value_hint = ValueHint::FilePath)]
     pub manifest_path: Option<PathBuf>,
 
+    #[command(flatten)]
+    pub workspace: clap_cargo::Workspace,
+
     #[command(flatten)]
     pub user_output_opts: UserOutputOpts,
 

src/context.rs

@@ -240,6 +240,9 @@ pub struct EnvironmentContext {
     /// Does not include a manifest file like Cargo.toml, so it's easy to append
     /// a file path like `Cargo.toml` or `Cargo.lock`.
     pub crate_path: Utf8PathBuf,
+
+    /// Resolved workspace
+    pub workspace_packages: WorkspacePackages,
 }
 
 impl<'shared_opts> TryFrom<&'shared_opts SharedOpts> for EnvironmentContext {
@@ -275,7 +278,16 @@ impl<'shared_opts> TryFrom<&'shared_opts SharedOpts> for EnvironmentContext {
             CargoMSRVError::Path(PathError::InvalidUtf8(InvalidUtf8Error::from(err)))
         })?;
 
-        Ok(Self { crate_path })
+        let metadata = cargo_metadata::MetadataCommand::new()
+            .manifest_path(&crate_path)
+            .exec()?;
+        let workspace = opts.workspace.partition_packages(&metadata);
+        let workspace_packages = WorkspacePackages::from_iter(workspace.0.into_iter().cloned());
+
+        Ok(Self {
+            crate_path,
+            workspace_packages,
+        })
     }
 }
 
@@ -298,6 +310,19 @@ impl EnvironmentContext {
 
 // ---
 
+#[derive(Clone, Debug)]
+pub struct WorkspacePackages {
+    _selected: Vec<cargo_metadata::Package>,
+}
+
+impl WorkspacePackages {
+    pub fn from_iter(selected: impl IntoIterator<Item = cargo_metadata::Package>) -> Self {
+        Self {
+            _selected: selected.into_iter().collect(),
+        }
+    }
+}
+
 #[derive(Clone, Copy, Debug, Default, PartialEq, ValueEnum)]
 pub enum OutputFormat {
     /// Progress bar rendered to stderr