Refactor pkg/trackclipboard to align with SOLID principles

[vldcreation]

This commit refactors the trackclipboard module to improve its design and maintainability by applying SOLID principles.

Key changes:

1. Single Responsibility Principle (SRP):

   • local_channel.go: Extracted file/path manipulation (ensureLogFile) from processMessages.
   • track.go:
     • NewTrackClipboard: Separated configuration defaulting logic (getDefaultedAPPConfig, getDefaultedFileConfig) from core construction.
     • Track: Extracted clipboard data handling logic (handleClipboardData) from the main event loop.

2. Open/Closed Principle (OCP):

   • track.go: Implemented a factory pattern (ChannelFactory and registration) for creating TrackChannel instances (local, telegram). This replaces the switch statement in NewTrackClipboard, allowing new channel types to be added without modifying existing code.

3. Dependency Inversion Principle (DIP):

   • TrackClipboard now depends on the TrackChannel interface.
   • The factory pattern helps abstract the creation of concrete channel implementations.

4. Unit Tests:

   • Added comprehensive unit tests for all components within the module.
   • Utilized net/http/httptest for mocking Telegram API calls in telegram_channel_test.go.
   • Implemented a mockTrackChannel for testing TrackClipboard interactions.
   • Used package-level function variables to mock clipboard.Init and clipboard.Watch for testing the Track method's orchestration logic.

These changes lead to a more modular, testable, and maintainable trackclipboard package.

[Copilot]

Pull Request Overview

This PR refactors the trackclipboard module to align with SOLID principles by decoupling responsibilities, introducing a factory pattern for channel creation, and improving error handling and test coverage.

• Extracts file/path manipulation and default configuration logic into dedicated functions.
• Introduces a ChannelFactory registry with separate factories for local and Telegram channels.
• Enhances unit tests and refines error messages, particularly in clipboard data handling and file operations.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

File	Description
pkg/trackclipboard/track.go	Refactored configuration defaulting and channel creation with a factory pattern.
pkg/trackclipboard/local_channel.go	Updated processMessages to utilize ensureLogFile and improved file handling logic.
pkg/trackclipboard/local_channel_test.go	Added comprehensive tests for local channel functionality and error scenarios.

[Copilot]

[nitpick] The tilde expansion logic assumes the path always starts with '~/' and strips the first two characters. Consider validating the format or adding a clarifying comment to document this expectation.

Suggested change

	} else if strings.HasPrefix(cfg.Path, "~") { // Handle tilde expansion for Path
	homeDir, err := os.UserHomeDir()
	if err != nil {
	panic(fmt.Errorf("error getting user home directory for tilde expansion: %w", err))
	}
	cfg.Path = filepath.Join(homeDir, cfg.Path[2:])
	} else if strings.HasPrefix(cfg.Path, "~") {
	// Handle tilde expansion for Path. Expectation: paths starting with '~' must be followed by '/'.
	if len(cfg.Path) > 1 && cfg.Path[1] == '/' {
	homeDir, err := os.UserHomeDir()
	if err != nil {
	panic(fmt.Errorf("error getting user home directory for tilde expansion: %w", err))
	}
	cfg.Path = filepath.Join(homeDir, cfg.Path[2:])
	} else {
	panic(fmt.Errorf("invalid path format for tilde expansion: %s", cfg.Path))
	}

[Copilot]

[nitpick] Rather than only printing the error, consider propagating it or implementing a more robust error handling strategy to flag file initialization failures louder.

[Copilot]

[nitpick] Consider introducing synchronization (e.g., a WaitGroup) to ensure that the processMessages goroutine has fully terminated before Close() returns, preventing potential race conditions.