Basic support for browsing a specific version of a crate

src/app.rs

@@ -19,6 +19,17 @@ pub enum Route {
     About,
     #[at("/search/:krate")]
     Search { krate: String },
+    #[at("/browse/:name/:version")]
+    Browse {
+        name: String,
+        version: VersionId,
+    },
+    #[at("/browse/:name/:version/*path")]
+    BrowseFile {
+        name: String,
+        version: VersionId,
+        path: String,
+    },
     #[at("/:name/")]
     Crate { name: String },
     #[at("/:src_name/:dst_name")]
@@ -56,6 +67,23 @@ fn switch(route: Route) -> Html {
     match route {
         Route::Home => html! { <Home /> },
         Route::About => html! { <About /> },
+        Route::Browse { name, version } => html! {
+            <Diff
+                src_name={name.clone()}
+                dst_name={name}
+                old={version.clone()}
+                new={version}
+            />
+        },
+        Route::BrowseFile { name, version, path } => html! {
+            <Diff
+                src_name={name.clone()}
+                dst_name={name}
+                old={version.clone()}
+                new={version}
+                {path}
+            />
+        },
         Route::Crate { name } => html! {
             <Diff
                 src_name={name.clone()}

src/components/diff_view.rs

@@ -103,6 +103,7 @@ pub struct DiffViewProps {
 pub fn DiffView(props: &DiffViewProps) -> Html {
     let empty = FileDiff::default();
     let file_diff = props.diff.files.get(&props.path).unwrap_or(&empty);
+    let is_identical_version = props.diff.left.version == props.diff.right.version;
 
     // if this file does not exist, this will be none. so we use this trick to convert the none
     // case into an empty iterator, meaning that it will simply be rendered as an empty file.
@@ -142,7 +143,9 @@ pub fn DiffView(props: &DiffViewProps) -> Html {
         stack.push(DiffGroupInfo {
             group: changes.by_ref().cloned().collect(),
             range: cursor..file_diff.changes.len(),
-            in_context: false,
+            // When comparing a version of the crate to itself, this group will
+            // always contain the full text of the file. Don't collapse it.
+            in_context: is_identical_version,
         });
     }