Adding a new parameter for model, and updating the default to 2.5 Flash. (#18)

packages/cli/src/config/globalConfig.ts

@@ -0,0 +1,50 @@
+import { CliArgs } from './args.js'; // Assuming CliArgs contains the needed fields
+
+interface GlobalConfig {
+  model: string;
+  // Add other global config values here if needed
+  // e.g., targetDir?: string;
+}
+
+let config: GlobalConfig | null = null;
+
+/**
+ * Initializes the global configuration. Should only be called once at application startup.
+ * @param args The parsed command-line arguments.
+ */
+export function initializeConfig(args: Pick<CliArgs, 'model'>): void {
+  if (config) {
+    console.warn('Global configuration already initialized.');
+    return;
+  }
+  if (!args.model) {
+    // This shouldn't happen if default is set correctly in args.ts
+    throw new Error('Model not provided during config initialization.');
+  }
+  config = {
+    model: args.model,
+    // Initialize other config values from args here
+  };
+}
+
+/**
+ * Retrieves the globally stored configuration.
+ * Throws an error if the configuration has not been initialized.
+ * @returns The global configuration object.
+ */
+export function getConfig(): GlobalConfig {
+  if (!config) {
+    throw new Error(
+      'Global configuration accessed before initialization. Call initializeConfig() first.',
+    );
+  }
+  return config;
+}
+
+/**
+ * Helper function to get the configured Gemini model name.
+ * @returns The model name string.
+ */
+export function getModel(): string {
+  return getConfig().model;
+}