feat(downloader): wire VcsDownloader subclasses via shared downloaders

Share downloaders as Rc<RefCell<dyn DownloaderInterface>> in
DownloadManager and make DownloaderInterface/VcsDownloader take
&mut self, matching PHP's mutable-by-reference downloader objects.
This lets Git/Svn/Hg/Fossil/Perforce implement VcsDownloader and route
download/install/update/prepare/cleanup through the trait instead of
todo!(), and wires the as_* downcast hooks end-to-end.

ChangeReportInterface::get_local_changes becomes &mut self since
FileDownloader downloads to a compare dir; get_commit_logs/reapply_changes
gain &mut self / Result to match the concrete implementations.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 12 insertions, 10 deletions

diff --git a/crates/shirabe/src/downloader/downloader_interface.rs b/crates/shirabe/src/downloader/downloader_interface.rs
index 873438e..f63ac4e 100644
--- a/crates/shirabe/src/downloader/downloader_interface.rs
+++ b/crates/shirabe/src/downloader/downloader_interface.rs
@@ -8,7 +8,7 @@ pub trait DownloaderInterface: std::fmt::Debug {
     fn get_installation_source(&self) -> String;
 
     async fn download(
-        &self,
+        &mut self,
         package: PackageInterfaceHandle,
         path: &str,
         prev_package: Option<PackageInterfaceHandle>,
@@ -17,7 +17,7 @@ pub trait DownloaderInterface: std::fmt::Debug {
 
     /// Convenience for the PHP default `$output = true` overload.
     async fn download3(
-        &self,
+        &mut self,
         package: PackageInterfaceHandle,
         path: &str,
         prev_package: Option<PackageInterfaceHandle>,
@@ -26,7 +26,7 @@ pub trait DownloaderInterface: std::fmt::Debug {
     }
 
     async fn prepare(
-        &self,
+        &mut self,
         r#type: &str,
         package: PackageInterfaceHandle,
         path: &str,
@@ -34,7 +34,7 @@ pub trait DownloaderInterface: std::fmt::Debug {
     ) -> anyhow::Result<Option<PhpMixed>>;
 
     async fn install(
-        &self,
+        &mut self,
         package: PackageInterfaceHandle,
         path: &str,
         output: bool,
@@ -42,7 +42,7 @@ pub trait DownloaderInterface: std::fmt::Debug {
 
     /// Convenience for the PHP default `$output = true` overload.
     async fn install2(
-        &self,
+        &mut self,
         package: PackageInterfaceHandle,
         path: &str,
     ) -> anyhow::Result<Option<PhpMixed>> {
@@ -50,14 +50,14 @@ pub trait DownloaderInterface: std::fmt::Debug {
     }
 
     async fn update(
-        &self,
+        &mut self,
         initial: PackageInterfaceHandle,
         target: PackageInterfaceHandle,
         path: &str,
     ) -> anyhow::Result<Option<PhpMixed>>;
 
     async fn remove(
-        &self,
+        &mut self,
         package: PackageInterfaceHandle,
         path: &str,
         output: bool,
@@ -65,7 +65,7 @@ pub trait DownloaderInterface: std::fmt::Debug {
 
     /// Convenience for the PHP default `$output = true` overload.
     async fn remove2(
-        &self,
+        &mut self,
         package: PackageInterfaceHandle,
         path: &str,
     ) -> anyhow::Result<Option<PhpMixed>> {
@@ -73,14 +73,16 @@ pub trait DownloaderInterface: std::fmt::Debug {
     }
 
     async fn cleanup(
-        &self,
+        &mut self,
         r#type: &str,
         package: PackageInterfaceHandle,
         path: &str,
         prev_package: Option<PackageInterfaceHandle>,
     ) -> anyhow::Result<Option<PhpMixed>>;
 
-    fn as_change_report_interface(&self) -> Option<&dyn crate::downloader::ChangeReportInterface> {
+    fn as_change_report_interface(
+        &mut self,
+    ) -> Option<&mut dyn crate::downloader::ChangeReportInterface> {
         None
     }