chore: fix lint warnings in DiffRenderer

[jacob314]

Summary

Details

Related Issues

How to Validate

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker

[gemini-code-assist]

Summary of Changes

Hello @jacob314, 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 significantly enhances the DiffRenderer component by introducing word-level highlighting for changes within added and removed lines. This improvement provides a more precise visual representation of modifications, making it easier to identify exact changes at a glance. The change involves refactoring the diff processing logic to group related additions and deletions and extending the application's theming system to support specific highlight colors for these granular changes.

Highlights

• Word-Level Diff Highlighting: Implemented word-level highlighting for added and removed lines within diffs, providing more granular visual feedback on changes. This allows for precise identification of modified words rather than just entire lines.
• Diff Grouping Logic: Introduced new logic, including the groupDiffLines function, to intelligently group consecutive added and removed lines. This grouping is crucial for performing effective word-level comparisons between the original and modified content.
• Theming System Extension: Extended the application's theming system to support distinct highlight colors for word-level additions and removals. This involved updating theme definitions across various files (e.g., github-dark.ts, github-light.ts, no-color.ts) and their corresponding interfaces.
• Refactored Diff Rendering: The DiffRenderer component was refactored to incorporate the new diff grouping and word-level highlighting capabilities. This involved importing the diff library and updating the rendering functions to utilize the grouped lines and new highlight colors, enhancing the clarity of diff displays.

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[github-actions]

Size Change: +4.94 kB (+0.02%)

Total Size: 23.2 MB

Filename	Size	Change
./bundle/gemini.js	23.1 MB	+4.94 kB (+0.02%)

ℹ️ View Unchanged

Filename	Size
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB
./bundle/sandbox-macos-permissive-open.sb	890 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB

_{compressed-size-action}

[gemini-code-assist]

Code Review

This pull request introduces a significant enhancement to the diff renderer by adding word-level highlighting for changed lines, which greatly improves readability. The implementation involves grouping added/deleted lines and using the diff library to compare them. The changes also include extending the theme system to support highlight colors.

My review focuses on the new logic. I've found one issue in the theme creation logic that could lead to incorrect fallback behavior for highlight colors, which has been addressed with a more robust solution.

[gemini-code-assist]

The logic for constructing the diff object within semanticColors is overly complex and contains redundant fallbacks. The colors object, constructed just above, already contains the fully resolved color values from the customTheme.

Additionally, there's a subtle bug: using ?? for fallbacks doesn't handle cases where a highlight color is explicitly set to an empty string (''). In such cases, the fallback to the base added/removed color doesn't occur. Using || ensures that if a highlight color is falsy (like an empty string), it correctly falls back to the base line color. Furthermore, to prevent uninformative messages from whitespace-only strings, it's best practice to trim() the optional string before applying the fallback, ensuring that only truly meaningful values are used.

Simplifying this block to directly use the colors object and the correct fallback operator, along with trimming, will make the code more readable, maintainable, and correct.

      diff: {
        added: colors.DiffAdded,
        addedHighlight:
          (colors.DiffAddedHighlight || '').trim() || colors.DiffAdded,
        removed: colors.DiffRemoved,
        removedHighlight:
          (colors.DiffRemovedHighlight || '').trim() || colors.DiffRemoved,
      },

References

1. When using an optional string with a fallback value, trim the optional string and use the fallback if the result is empty to avoid uninformative messages from whitespace-only strings.

[gemini-cli]

Hi there! Thank you for your contribution to Gemini CLI. We really appreciate the time and effort you've put into this pull request.

To keep our backlog manageable and ensure we're focusing on current priorities, we are closing pull requests that haven't seen maintainer activity for 30 days. Currently, the team is prioritizing work associated with 🔒 maintainer only or help wanted issues.

If you believe this change is still critical, please feel free to comment with updated details. Otherwise, we encourage contributors to focus on open issues labeled as help wanted. Thank you for your understanding!