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

packages/cli/src/config/args.ts

@@ -1,8 +1,11 @@
 import yargs from 'yargs/yargs';
 import { hideBin } from 'yargs/helpers';
 
+const DEFAULT_GEMINI_MODEL = 'gemini-2.5-flash-preview-04-17';
+
 export interface CliArgs {
   target_dir: string | undefined;
+  model: string | undefined;
   _: (string | number)[]; // Captures positional arguments
   // Add other expected args here if needed
   // e.g., verbose?: boolean;
@@ -16,6 +19,12 @@ export async function parseArguments(): Promise<CliArgs> {
       description:
         'The target directory for Gemini operations. Defaults to the current working directory.',
     })
+    .option('model', {
+      alias: 'm',
+      type: 'string',
+      description: `The Gemini model to use. Defaults to ${DEFAULT_GEMINI_MODEL}.`,
+      default: DEFAULT_GEMINI_MODEL,
+    })
     .help()
     .alias('h', 'help')
     .strict() // Keep strict mode to error on unknown options

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;
+}