Scan all descending directories for index.js with 'create index'; (fixes #2)

src/bin/create-index.js

@@ -9,6 +9,17 @@ let argv;
 
 argv = yargs
     .demand(1)
+    .options({
+        'update-index': {
+            default: false,
+            description: 'Recursively iterates target directories looking for "index.js" files that start with "\'create index\';\\n" (create-index index file). Updates found index files. Does not create new index files.',
+            type: 'boolean'
+        }
+    })
+    .example('create-index ./src ./src/utilities', 'Creates or updates an existing create-index index file in the target (./src, ./src/utilities) directories.')
+    .example('create-index --update-index ./src ./tests', 'Finds all create-index index files in the target directories and descending directories. Updates found index files.')
     .argv;
 
-writeIndexCli(argv._);
+writeIndexCli(argv._, {
+    updateIndex: argv.updateIndex
+});