fix: Update bundle name generator to match SPM (#1183)

SPM generated bundles appear to have the format
`<package_name>_<module_name>.bundle` rather than
`<module_name>_<module_name>.bundle`.

I added the same test with the same name to both the `resources_example`
bazel tests and directly to the `CoolUI` example package to prove that
the generated names match.

examples/resources_example/Tests/MyAppTests/MyAppTests.swift

@@ -6,11 +6,17 @@ import SwiftUI
 import XCTest
 
 class MyAppTests: XCTestCase {
-    func test_CoolStuf_title_doesNotFail() throws {
+    func test_CoolStuff_title_doesNotFail() throws {
         let actual = CoolStuff.title()
         XCTAssertNotNil(actual)
     }
 
+
+    func test_CoolStuff_bundleName() {
+        let bundle = Bundle.bundle(named: "package-with-resources_CoolUI")
+        XCTAssertNotNil(bundle)
+    }
+
     func test_AppLovinSDKResources() throws {
         let url = ALResourceManager.resourceBundleURL
         XCTAssertNotNil(url)
@@ -46,3 +52,33 @@ class MyAppTests: XCTestCase {
         IterableLogUtil.sharedInstance = nil
     }
 }
+
+private class BundleFinder {}
+
+extension Foundation.Bundle {
+    static func bundle(named bundleName: String) -> Bundle? {
+        let candidates = [
+            // Bundle should be present here when the package is linked into an App.
+            Bundle.main.resourceURL,
+
+            // Bundle should be present here when the package is linked into a framework.
+            Bundle(for: BundleFinder.self).resourceURL,
+
+            // For command-line tools.
+            Bundle.main.bundleURL,
+
+            // Bundle should be present here when running previews from a different package (this is the path to "…/Debug-iphonesimulator/").
+            Bundle(for: BundleFinder.self).resourceURL?.deletingLastPathComponent().deletingLastPathComponent().deletingLastPathComponent(),
+            Bundle(for: BundleFinder.self).resourceURL?.deletingLastPathComponent().deletingLastPathComponent(),
+        ]
+
+        for candidate in candidates {
+            let bundlePath = candidate?.appendingPathComponent(bundleName + ".bundle")
+            if let bundle = bundlePath.flatMap(Bundle.init(url:)) {
+                return bundle
+            }
+        }
+
+        return nil
+    }
+}

examples/resources_example/third_party/package_with_resources/Package.swift

@@ -15,5 +15,9 @@ let package = Package(
             name: "CoolUI",
             resources: [.process("Resources")]
         ),
+        .testTarget(
+            name: "CoolUITests",
+            dependencies: ["CoolUI"]
+        )
     ]
 )

examples/resources_example/third_party/package_with_resources/Tests/CoolUITests/BundleNameTest.swift

@@ -0,0 +1,41 @@
+import Foundation
+import XCTest
+
+@testable import CoolUI
+
+class BundleNameTest: XCTestCase {
+    func testBundleName() {
+        let bundle = Bundle.bundle(named: "package-with-resources_CoolUI")
+        XCTAssertNotNil(bundle)
+    }
+}
+
+private class BundleFinder {}
+
+extension Foundation.Bundle {
+    static func bundle(named bundleName: String) -> Bundle? {
+        let candidates = [
+            // Bundle should be present here when the package is linked into an App.
+            Bundle.main.resourceURL,
+
+            // Bundle should be present here when the package is linked into a framework.
+            Bundle(for: BundleFinder.self).resourceURL,
+
+            // For command-line tools.
+            Bundle.main.bundleURL,
+
+            // Bundle should be present here when running previews from a different package (this is the path to "…/Debug-iphonesimulator/").
+            Bundle(for: BundleFinder.self).resourceURL?.deletingLastPathComponent().deletingLastPathComponent().deletingLastPathComponent(),
+            Bundle(for: BundleFinder.self).resourceURL?.deletingLastPathComponent().deletingLastPathComponent(),
+        ]
+
+        for candidate in candidates {
+            let bundlePath = candidate?.appendingPathComponent(bundleName + ".bundle")
+            if let bundle = bundlePath.flatMap(Bundle.init(url:)) {
+                return bundle
+            }
+        }
+
+        return nil
+    }
+}

swiftpkg/internal/pkginfo_targets.bzl

@@ -148,19 +148,20 @@ def _swift_hint_label_name(target_name):
     """
     return target_name + _swift_hint_suffix
 
-def _resource_bundle_name(module_name):
+def _resource_bundle_name(package_name, module_name):
     """Returns the `bundle_name` for the module.
 
     For Swift packages, it appears the bundle name is of the format
-    `<module_name>_<module_name>`.
+    `<package_name>_<module_name>`.
 
     Args:
+        package_name: The package name.
         module_name: The module name.
 
     Returns:
         The `bundle_name` of the `apple_resource_bundle` as a `string`.
     """
-    return module_name + "_" + module_name
+    return package_name + "_" + module_name
 
 def _resource_bundle_label_name(target_name):
     """Returns the name of the related `apple_resource_bundle` target.

swiftpkg/internal/swiftpkg_build_files.bzl

@@ -543,15 +543,16 @@ def _handle_target_resources(
 
     return _apple_resource_bundle(
         target,
+        pkg_ctx.pkg_info.name,
         pkg_ctx.pkg_info.default_localization,
         include_swift_accessor = include_swift_accessor,
         include_objc_accessor = include_objc_accessor,
     )
 
-def _apple_resource_bundle(target, default_localization, include_swift_accessor, include_objc_accessor):
+def _apple_resource_bundle(target, package_name, default_localization, include_swift_accessor, include_objc_accessor):
     bzl_target_name = pkginfo_targets.bazel_label_name(target)
     bundle_label_name = pkginfo_targets.resource_bundle_label_name(bzl_target_name)
-    bundle_name = pkginfo_targets.resource_bundle_name(target.c99name)
+    bundle_name = pkginfo_targets.resource_bundle_name(package_name, target.c99name)
     infoplist_name = pkginfo_targets.resource_bundle_infoplist_label_name(
         bzl_target_name,
     )

swiftpkg/tests/swiftpkg_build_files_tests.bzl

@@ -824,15 +824,15 @@ load("@rules_swift_package_manager//swiftpkg:build_defs.bzl", "resource_bundle_a
 
 apple_resource_bundle(
     name = "SwiftLibraryWithFilePathResource.rspm_resource_bundle",
-    bundle_name = "SwiftLibraryWithFilePathResource_SwiftLibraryWithFilePathResource",
+    bundle_name = "MyPackage_SwiftLibraryWithFilePathResource",
     infoplists = [":SwiftLibraryWithFilePathResource.rspm_resource_bundle_infoplist"],
     resources = ["Source/SwiftLibraryWithFilePathResource/Resources/chicken.json"],
     visibility = ["//:__subpackages__"],
 )
 
 resource_bundle_accessor(
     name = "SwiftLibraryWithFilePathResource.rspm_resource_bundle_accessor",
-    bundle_name = "SwiftLibraryWithFilePathResource_SwiftLibraryWithFilePathResource",
+    bundle_name = "MyPackage_SwiftLibraryWithFilePathResource",
 )
 
 resource_bundle_infoplist(
@@ -865,7 +865,7 @@ load("@rules_swift_package_manager//swiftpkg:build_defs.bzl", "generate_modulema
 
 apple_resource_bundle(
     name = "ObjcLibraryWithResources.rspm_resource_bundle",
-    bundle_name = "ObjcLibraryWithResources_ObjcLibraryWithResources",
+    bundle_name = "MyPackage_ObjcLibraryWithResources",
     infoplists = [":ObjcLibraryWithResources.rspm_resource_bundle_infoplist"],
     resources = ["Source/ObjcLibraryWithResources/Resources/chicken.json"],
     visibility = ["//:__subpackages__"],
@@ -929,7 +929,7 @@ objc_resource_bundle_accessor_hdr(
 
 objc_resource_bundle_accessor_impl(
     name = "ObjcLibraryWithResources.rspm_objc_resource_bundle_accessor_impl",
-    bundle_name = "ObjcLibraryWithResources_ObjcLibraryWithResources",
+    bundle_name = "MyPackage_ObjcLibraryWithResources",
     module_name = "ObjcLibraryWithResources",
 )