refactor(gitcommit): improve auto-generation reliability for commit m…

[jinzhongjia]

…essages

• enhance auto-generation mechanism with multiple event triggers
• add stable timing detection for different Git tools
• implement debounce and tracking to prevent duplicate generations
• support graceful handling of buffer states and Git operations

[gemini-code-assist]

Summary of Changes

Hello @jinzhongjia, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the auto-generation logic for Git commit messages to significantly improve its reliability and compatibility across different Git workflows and tools. It introduces a more robust event-triggering system, incorporates stable timing detection, and implements mechanisms to prevent duplicate generations, ensuring that commit messages are generated accurately and efficiently while respecting user intent and buffer states.

Highlights

• Enhanced Auto-Generation Triggers: The auto-generation mechanism for commit messages has been significantly improved by introducing multiple event triggers, including WinEnter, BufWinEnter, and CursorMoved, to ensure broader compatibility with various Git tools like Fugitive.
• Stable Timing and Debouncing: A new schedule_auto_generate function with an extended delay and debouncing logic has been implemented to provide stable timing detection, preventing race conditions and ensuring commit messages are generated reliably and only once.
• Duplicate Generation Prevention: The system now tracks whether auto-generation has already been attempted for a buffer (auto_generate_attempted flag) and cancels pending timers to prevent duplicate commit message generations.
• Graceful Buffer and Git Operation Handling: A should_attempt_auto_generate function was added to gracefully handle various buffer states, such as checking for existing commit messages, validating the buffer, and respecting the skip_auto_generate_on_amend configuration during Git amend operations.
• Resource Cleanup: Autocmds for BufDelete and BufUnload have been added to ensure that any pending auto-generation timers are properly stopped and cleaned up when a buffer is closed or unloaded.

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[gemini-code-assist]

Code Review

This pull request significantly improves the reliability of the automatic commit message generation by introducing multiple event triggers, debouncing, and better state management. The changes are well-structured and address the core goal of improving stability with different Git tools. I have a couple of suggestions to further enhance reliability and maintainability, primarily by refactoring the autocommand setup and addressing a magic number. Overall, this is a solid improvement.