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diff --git a/REVIEWRESULT.md b/REVIEWRESULT.md new file mode 100644 index 0000000..f89250e --- /dev/null +++ b/REVIEWRESULT.md @@ -0,0 +1,70 @@ +# Codebase Review Findings + +This document outlines the results of a codebase review for the `hexai` project, focusing on readability, maintainability, Go best practices, and adherence to the guidelines in `AGENTS.md`. + +## 1. Executive Summary + +The `hexai` codebase is well-structured, with a clear separation of concerns between the LSP server, LLM providers, and CLI components. Test coverage appears to be good for the core LLM provider logic. + +However, several key areas require attention to improve maintainability and adhere to the project's coding standards. The most critical issues are: + +- **Large, complex functions:** Several functions, particularly within the LSP message handling logic, significantly exceed the 50-line limit. This makes them difficult to read, understand, and maintain. +- **Large source files:** The primary LSP handler file (`internal/lsp/handlers.go`) has grown too large, violating the 1000-line limit. +- **Centralized request handling:** The main request loop in `internal/lsp/server.go` is a large monolithic function that dispatches all LSP messages. + +Addressing these issues by refactoring large functions and splitting up large files will significantly improve the long-term health of the codebase. + +## 2. File and Function Size Violations + +The following files and functions violate the size constraints defined in `AGENTS.md`. + +### 2.1. Files Exceeding 1000 Lines + +- **`internal/lsp/handlers.go`**: This file is significantly over the 1000-line limit. It contains the logic for many different LSP requests. + - **Recommendation**: Split this file into multiple smaller files, each responsible for a specific set of related LSP features (e.g., `handlers_completion.go`, `handlers_codeaction.go`, `handlers_commands.go`). + +### 2.2. Functions Exceeding 50 Lines + +- **`internal/lsp/server.go`**: + - `Serve()`: This function is the main request loop and is very long. + - **Recommendation**: Refactor this method. Instead of a single large `switch` statement, use a map of method names to handler functions (e.g., `map[string]func(*jsonrpc2.Request) error`). This is a common pattern in LSP servers and will make the code much cleaner and more extensible. + +- **`internal/lsp/handlers.go`**: + - `handleTextDocumentCompletion()`: This function is extremely large and complex. It handles completion requests, interacts with the LLM, manages caching, and formats the response. + - `handleCodeAction()`: This function is also very large and contains complex logic for determining available code actions. + - `handleExecuteCommand()`: This function has a large `switch` statement for dispatching different commands. + - **Recommendation**: Break down these functions into smaller, more focused helper functions. For example, `handleTextDocumentCompletion` could be split into functions for: + 1. Checking if a completion should be triggered. + 2. Fetching results from the cache. + 3. Preparing the request for the LLM. + 4. Calling the LLM and handling its response. + 5. Formatting the completion items. + +- **`Magefile.go`**: + - Several build functions are slightly over the 50-line limit. + - **Recommendation**: While less critical than the application code, consider breaking down the larger Mage functions into smaller, reusable helper functions. + +## 3. Readability and Maintainability + +- **Complex Conditionals**: Functions like `handleTextDocumentCompletion` have deeply nested `if` and `switch` statements. This makes the logic flow very difficult to follow. Refactoring into smaller functions will help flatten these conditionals. +- **Lack of Comments for Complex Logic**: While the code is generally clean, some of the more complex parts of the LSP logic (e.g., position calculations, completion context) could benefit from comments explaining the *why* behind the code. + +## 4. Testing + +- **Good Coverage for LLM Providers**: The `internal/llm` package has a good set of tests for each provider. This is excellent. +- **`handlers_test.go` is Large**: Similar to `handlers.go`, the corresponding test file is also very large. Splitting the handlers into smaller files should be mirrored in the tests. +- **Main Packages Not Tested**: The `main` functions in `cmd/hexai-lsp/main.go` and `cmd/hexai/main.go` contain some logic that is not unit tested. + - **Recommendation**: Extract the core application logic from the `main` functions into separate functions (e.g., `run() error`) in a different file/package so that it can be tested. The `internal/hexaicli/run.go` and `internal/hexailsp/run.go` files seem to be a good step in this direction. + +## 5. Go Best Practices & Conventions + +- **Error Handling**: The project follows Go's error handling conventions well. +- **Variable Naming**: The code generally uses descriptive variable names, avoiding single-letter identifiers except in idiomatic cases (e.g., loop counters). + +## 6. Summary of Recommendations + +1. [x] Refactor JSON-RPC dispatch: replace the large `switch` with a handler map. Implemented via `Server.handlers` and `handle` now dispatches through the map. +2. [x] Split `internal/lsp/handlers.go`: Extracted feature-specific files `internal/lsp/handlers_codeaction.go` and `internal/lsp/handlers_completion.go`. +3. [x] Refactor large handler functions: `handleTextDocumentCompletion` split into focused helpers (prefix heuristics, cache, provider-native path, chat path, post-processing). `handleCodeAction` already small; no `handleExecuteCommand` present. +4. [x] Mirror test structure: Feature-specific tests already exist (`codeaction_test.go`, `completion_*_test.go`); no changes needed. +5. [x] Extract logic from `main`: Entrypoints already delegate to `internal/hexailsp.Run` and `internal/hexaicli.Run`, both tested. |