ability to generate only selected packages and dependencies

sdk-builder/src/main.rs

@@ -23,6 +23,8 @@ pub struct Build {
     single_file: bool,
     #[arg(short, long, default_value = "true")]
     feature_gate: bool,
+    #[arg(long, value_delimiter = ',', num_args = 1..)]
+    packages: Option<Vec<String>>,
 }
 
 #[derive(Subcommand)]
@@ -257,10 +259,19 @@ pub mod rust {
         }
 
         pub fn build(self, args: &super::Build) -> anyhow::Result<BTreeMap<String, TokenStream>> {
-            let packages = self
+            let pkgs = if let Some(packages) = &args.packages {
-                .sdk
+                let deps = self.dependencies_for_package_names(packages);
-                .packages
+                log::debug!("all dependencies: {deps:?}");
-                .values()
+
+                deps.iter()
+                    .map(|id| self.sdk.packages.get(id).unwrap())
+                    .collect::<Vec<_>>()
+            } else {
+                self.sdk.packages.values().collect::<Vec<_>>()
+            };
+
+            let packages = pkgs
+                .into_iter()
                 .map(|pkg| {
                     let name = canonicalize_name(&pkg.name).to_string();
                     let tokens = self.generate_package(pkg, args.feature_gate)?;
@@ -272,6 +283,43 @@ pub mod rust {
             Ok(packages)
         }
 
+        fn get_package_by_name(&self, name: &str) -> Option<PackageRef> {
+            self.sdk
+                .packages
+                .iter()
+                .find(|(_, pkg)| &pkg.name == name)
+                .map(|(id, _)| *id)
+        }
+
+        fn dependencies_for_package_names(&self, names: &Vec<String>) -> BTreeSet<PackageRef> {
+            names
+                .iter()
+                .filter_map(|name| self.get_package_by_name(name))
+                .flat_map(|id| self.dependencies(self.sdk.packages.get(&id).unwrap()))
+                .collect::<BTreeSet<_>>()
+        }
+
+        fn dependencies(&self, pkg: &ProcessedPackage) -> BTreeSet<PackageRef> {
+            let mut set = BTreeSet::new();
+
+            self.dependencies_inner(pkg, &mut set);
+
+            set
+        }
+
+        fn dependencies_inner(&self, pkg: &ProcessedPackage, pkgs: &mut BTreeSet<PackageRef>) {
+            pkgs.insert(pkg.package_object);
+
+            // depth first, does that matter?
+            for id in pkg.dependencies.iter() {
+                if !pkgs.contains(id) {
+                    if let Some(pkg) = self.sdk.packages.get(id) {
+                        self.dependencies_inner(pkg, pkgs);
+                    }
+                }
+            }
+        }
+
         pub fn build_in_dir<P: AsRef<Path>>(
             self,
             path: P,