implement more code functionalities

lib/core/code/README.md

@@ -35,4 +35,39 @@ for struct in structs {
 }
 ```
 
-The [openrpc/docgen](../openrpc/docgen/) module demonstrates a good use case, where codemodels are serialized into JSON schema's, to generate an OpenRPC description document from a client in v.
+The [openrpc/docgen](../openrpc/docgen/) module demonstrates a good use case, where codemodels are serialized into JSON schema's, to generate an OpenRPC description document from a client in v.## V Language Utilities
+
+The `vlang_utils.v` file provides a set of utility functions for working with V language files and code. These utilities are useful for:
+
+1. **File Operations**
+   - `list_v_files(dir string) ![]string` - Lists all V files in a directory, excluding generated files
+   - `get_module_dir(mod string) string` - Converts a V module path to a directory path
+
+2. **Code Inspection and Analysis**
+   - `get_function_from_file(file_path string, function_name string) !string` - Extracts a function definition from a file
+   - `get_function_from_module(module_path string, function_name string) !string` - Searches for a function across all files in a module
+   - `get_type_from_module(module_path string, type_name string) !string` - Searches for a type definition across all files in a module
+
+3. **V Language Tools**
+   - `vtest(fullpath string) !string` - Runs V tests on files or directories
+   - `vvet(fullpath string) !string` - Runs V vet on files or directories
+
+### Example Usage
+
+```v
+// Find and extract a function definition
+function_def := code.get_function_from_module('/path/to/module', 'my_function') or {
+    eprintln('Could not find function: ${err}')
+    return
+}
+println(function_def)
+
+// Run tests on a directory
+test_results := code.vtest('/path/to/module') or {
+    eprintln('Tests failed: ${err}')
+    return
+}
+println(test_results)
+```
+
+These utilities are particularly useful when working with code generation, static analysis, or when building developer tools that need to inspect V code.