refactor(composer): represent composer via trait-based handlesrefactor/composer-handles

Replace the PartialComposer/Composer structs and the single
Rc<RefCell<PartialOrFullComposer>> enum with PartialComposer and
Composer traits (Composer: PartialComposer), InnerPartialComposer /
InnerFullComposer data structs, and the handle types FullComposerHandle
(impl Composer) and AnyComposerHandle (polymorphic enum, impl
PartialComposer), plus their weak variants.

Factory builds the full and partial graphs via separate Rc::new_cyclic
branches that share a build_composer_base helper. Call sites now use
trait methods that encapsulate borrowing instead of borrow_partial() /
composer_full*().

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

1 files changed, 7 insertions, 9 deletions

diff --git a/crates/shirabe/src/installer/library_installer.rs b/crates/shirabe/src/installer/library_installer.rs
index c1fedef..b50dbff 100644
--- a/crates/shirabe/src/installer/library_installer.rs
+++ b/crates/shirabe/src/installer/library_installer.rs
@@ -9,7 +9,7 @@ use shirabe_php_shim::{
     realpath, rmdir, rtrim, strpos,
 };
 
-use crate::composer::PartialComposerWeakHandle;
+use crate::composer::{AnyComposerWeakHandle, Composer, PartialComposer};
 use crate::downloader::DownloadManager;
 use crate::installer::BinaryInstaller;
 use crate::installer::BinaryPresenceInterface;
@@ -24,7 +24,7 @@ use crate::util::Silencer;
 /// Package installation manager.
 #[derive(Debug)]
 pub struct LibraryInstaller {
-    pub(crate) composer: PartialComposerWeakHandle,
+    pub(crate) composer: AnyComposerWeakHandle,
     pub(crate) vendor_dir: String,
     pub(crate) download_manager: Option<std::rc::Rc<std::cell::RefCell<DownloadManager>>>,
     pub(crate) io: std::rc::Rc<std::cell::RefCell<dyn IOInterface>>,
@@ -37,7 +37,7 @@ impl LibraryInstaller {
     /// Initializes library installer.
     pub fn new(
         io: std::rc::Rc<std::cell::RefCell<dyn IOInterface>>,
-        composer: PartialComposerWeakHandle,
+        composer: AnyComposerWeakHandle,
         r#type: Option<String>,
         filesystem: Option<std::rc::Rc<std::cell::RefCell<Filesystem>>>,
         binary_installer: Option<BinaryInstaller>,
@@ -48,15 +48,13 @@ impl LibraryInstaller {
 
         let download_manager = composer_rc
             .as_full()
-            .map(|full| full.borrow().get_download_manager());
-
-        let composer_ref = composer_rc.borrow_partial();
+            .map(|full| full.get_download_manager());
 
         let filesystem = filesystem
             .unwrap_or_else(|| std::rc::Rc::new(std::cell::RefCell::new(Filesystem::new(None))));
         let vendor_dir = rtrim(
             // TODO(phase-b): Config::get returns PhpMixed; coerce to String via get_str.
-            &composer_ref
+            &composer_rc
                 .get_config()
                 .borrow_mut()
                 .get_str("vendor-dir")
@@ -68,7 +66,7 @@ impl LibraryInstaller {
                 // TODO(phase-b): pass io by reference/clone
                 todo!("io reference"),
                 rtrim(
-                    &composer_ref
+                    &composer_rc
                         .get_config()
                         .borrow_mut()
                         .get_str("bin-dir")
@@ -76,7 +74,7 @@ impl LibraryInstaller {
                     Some("/"),
                 ),
                 // TODO(phase-b): Config::get returns PhpMixed; coerce to String via get_str.
-                composer_ref
+                composer_rc
                     .get_config()
                     .borrow_mut()
                     .get_str("bin-compat")