refactor(composer): hold managers behind *Interface traits

Composer/PartialComposer exposed its RepositoryManager, InstallationManager,
EventDispatcher, Locker, DownloadManager, AutoloadGenerator and ArchiveManager
as concrete types, but Composer's public setters (setDownloadManager() etc.)
let plugins swap in subclasses. Introduce a *Interface trait per manager and
store each as Rc<RefCell<dyn ...Interface>> so a replacement is honored.

Only Composer's slots and the sinks fed from its accessors become trait
objects; managers injected concretely at construction keep their concrete
references, matching PHP semantics. Fluent setters on the affected classes now
return () and Locker::update_hash is de-generified to a boxed FnOnce so the
traits stay object-safe.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

1 files changed, 75 insertions, 0 deletions

diff --git a/crates/shirabe/src/installer/installation_manager.rs b/crates/shirabe/src/installer/installation_manager.rs
index ac5f8e4..bee14cc 100644
--- a/crates/shirabe/src/installer/installation_manager.rs
+++ b/crates/shirabe/src/installer/installation_manager.rs
@@ -791,3 +791,78 @@ impl InstallationManager {
         }
     }
 }
+
+// Composer's PartialComposer::setInstallationManager() accepts any InstallationManager subclass, so
+// plugins may swap in a replacement. The interface captures the methods reached through Composer's
+// accessor and through the `&mut dyn InstallationManagerInterface` references fed from it.
+pub trait InstallationManagerInterface: std::fmt::Debug {
+    fn add_installer(&mut self, installer: Box<dyn InstallerInterface>);
+    fn remove_installer(&mut self, installer: &dyn InstallerInterface);
+    fn disable_plugins(&mut self);
+    fn is_package_installed(
+        &mut self,
+        repo: &dyn InstalledRepositoryInterface,
+        package: PackageInterfaceHandle,
+    ) -> Result<bool>;
+    fn ensure_binaries_presence(&mut self, package: PackageInterfaceHandle);
+    fn execute(
+        &mut self,
+        repo: &mut dyn InstalledRepositoryInterface,
+        operations: Vec<std::rc::Rc<dyn OperationInterface>>,
+        dev_mode: bool,
+        run_scripts: bool,
+        download_only: bool,
+    ) -> Result<()>;
+    fn get_install_path(&mut self, package: PackageInterfaceHandle) -> Option<String>;
+    fn set_output_progress(&mut self, output_progress: bool);
+    fn notify_installs(&mut self, io: std::rc::Rc<std::cell::RefCell<dyn IOInterface>>);
+}
+
+impl InstallationManagerInterface for InstallationManager {
+    fn add_installer(&mut self, installer: Box<dyn InstallerInterface>) {
+        self.add_installer(installer);
+    }
+
+    fn remove_installer(&mut self, installer: &dyn InstallerInterface) {
+        self.remove_installer(installer);
+    }
+
+    fn disable_plugins(&mut self) {
+        self.disable_plugins();
+    }
+
+    fn is_package_installed(
+        &mut self,
+        repo: &dyn InstalledRepositoryInterface,
+        package: PackageInterfaceHandle,
+    ) -> Result<bool> {
+        self.is_package_installed(repo, package)
+    }
+
+    fn ensure_binaries_presence(&mut self, package: PackageInterfaceHandle) {
+        self.ensure_binaries_presence(package);
+    }
+
+    fn execute(
+        &mut self,
+        repo: &mut dyn InstalledRepositoryInterface,
+        operations: Vec<std::rc::Rc<dyn OperationInterface>>,
+        dev_mode: bool,
+        run_scripts: bool,
+        download_only: bool,
+    ) -> Result<()> {
+        self.execute(repo, operations, dev_mode, run_scripts, download_only)
+    }
+
+    fn get_install_path(&mut self, package: PackageInterfaceHandle) -> Option<String> {
+        self.get_install_path(package)
+    }
+
+    fn set_output_progress(&mut self, output_progress: bool) {
+        self.set_output_progress(output_progress);
+    }
+
+    fn notify_installs(&mut self, io: std::rc::Rc<std::cell::RefCell<dyn IOInterface>>) {
+        self.notify_installs(io);
+    }
+}