add new static file and file handler for rustdoc's source sidebar

Author: QuietMisdreavus

src/docbuilder/chroot_builder.rs

@@ -396,7 +396,8 @@ impl DocBuilder {
                       "rustdoc.css",
                       "settings.css",
                       "storage.js",
-                      "theme.js"],
+                      "theme.js",
+                      "source-script.js"],
                      // files doesn't require rustc version subfix
                      ["FiraSans-Medium.woff",
                       "FiraSans-Regular.woff",

src/web/mod.rs

@@ -177,6 +177,9 @@ impl CratesfyiHandler {
         router.get("/:crate/:version/aliases.js",
                    rustdoc::rustdoc_html_server_handler,
                    "crate_version_aliases_js");
+        router.get("/:crate/:version/source-files.js",
+                   rustdoc::rustdoc_html_server_handler,
+                   "crate_version_source_files_js");
         router.get("/:crate/:version/:target",
                    rustdoc::rustdoc_redirector_handler,
                    "crate_version_target");