Summary

This PR introduces a comprehensive logging system throughout the application.
A new logging service has been added to write structured logs to a file. This
service has been integrated into most modules to provide detailed information
about operations, errors, and debugging states.

Changes

• New Logging Service (src/services/logging.ts):

  • Added a Logger class with info, warning, error, and debug
    static methods.
  • Logs are written in JSON format to APP_CONFIG_DIR/logs/app.log.
  • Uses deno.land/std/fs/ensure_file.ts to ensure the log file and
    directory exist.

• Widespread Logger Integration:

  • API Server (src/api/server.ts): Added request/response logging
    middleware and specific logs for server initialization, command
    handling, and errors.
  • LLM Provider (src/services/llm_providers/default.ts): Integrated
    logging for provider initialization, stream creation, web search
    operations, and message sending, including error handling.
  • Tools (src/services/tools/*.ts): Added extensive logging within
    all tool processing functions (common, fs, git) for operations,
    arguments, results, and errors. The log parameter in tool process
    functions has been renamed to print.
  • UI Store (src/store/main.ts): Incorporated logging for store
    initialization, state changes (e.g., operation mode, chat history,
    file context), user prompt submissions, and clipboard operations.
  • Configuration (src/utils/config.ts): Added logging for config
    file loading, updating, and error handling. APP_DIR now uses a new
    helper function.
  • Git Utilities (src/utils/git.ts): Implemented logging for git
    command execution, diff generation, commits, and listing modified
    files.

• Dependency Updates (deno.lock):

  • Added new Deno standard library dependencies for fs utilities
    (ensure_file, _get_file_info_type, _to_path_string,
    ensure_dir) at version std@0.224.0, primarily to support the new
    logging service.

• Helper Utilities (src/utils/helpers.ts):

  • Introduced getAppConfigDir() function to determine the application's
    configuration directory, used by the logging service and config
    loading.

• Minor Adjustments:

  • Slightly modified the SYSTEM prompt string in
    src/utils/constants.ts.
  • Adjusted FUZZY_MATCH_SIMILARITY_THRESHOLD in
    src/services/tools/fs.ts.