Fix crash bundle (#1448)

* create availableModule to avoid crash on Bundle loading

* remove unnecessary line

Author: freddi-kit

Sources/XcodeGenKit/SettingsBuilder.swift

@@ -249,7 +249,7 @@ extension SettingsPresetFile {
                 symlink.parent() + relativePath,
             ] + possibleSettingsPaths
         }
-        if let moduleResourcePath = Bundle.module.path(forResource: "SettingPresets", ofType: nil) {
+        if let moduleResourcePath = Bundle.availableModule?.path(forResource: "SettingPresets", ofType: nil) {
             possibleSettingsPaths.append(Path(moduleResourcePath) + "\(path).yml")
         }
 
@@ -272,3 +272,48 @@ extension SettingsPresetFile {
         return buildSettings
     }
 }
+
+private class BundleFinder {}
+
+/// The default SPM generated `Bundle.module` crashes on runtime if there is no .bundle file.
+/// Below implementation modified from generated `Bundle.module` code which call `fatalError` if .bundle file not found.
+private extension Bundle {
+    /// Returns the resource bundle associated with the current Swift module.
+    static let availableModule: Bundle? = {
+        let bundleName = "XcodeGen_XcodeGenKit"
+
+        let overrides: [URL]
+        #if DEBUG
+        // The 'PACKAGE_RESOURCE_BUNDLE_PATH' name is preferred since the expected value is a path. The
+        // check for 'PACKAGE_RESOURCE_BUNDLE_URL' will be removed when all clients have switched over.
+        // This removal is tracked by rdar://107766372.
+        if let override = ProcessInfo.processInfo.environment["PACKAGE_RESOURCE_BUNDLE_PATH"]
+                       ?? ProcessInfo.processInfo.environment["PACKAGE_RESOURCE_BUNDLE_URL"] {
+            overrides = [URL(fileURLWithPath: override)]
+        } else {
+            overrides = []
+        }
+        #else
+        overrides = []
+        #endif
+
+        let candidates = overrides + [
+            // 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,
+        ]
+
+        for candidate in candidates {
+            let bundlePath = candidate?.appendingPathComponent(bundleName + ".bundle")
+            if let bundle = bundlePath.flatMap(Bundle.init(url:)) {
+                return bundle
+            }
+        }
+        return nil
+    }()
+}