fix(deps): update module github.com/mattn/go-sixel to v0.0.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/mattn/go-sixel	v0.0.5 → v0.0.8

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Release Notes

mattn/go-sixel (github.com/mattn/go-sixel)

v0.0.8

Compare Source

v0.0.7

Compare Source

v0.0.6

Compare Source

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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[github-actions]

Renovate PR Review Results

⚖️ Safety Assessment: ✅ Safe

🔍 Release Content Analysis

Version Change: v0.0.5 → v0.0.8 (3 minor version increments)

Commits Included (4 commits, January 7-8, 2026):

1. 0f1acbe - fix
2. d99d124 - support background color
3. c2e88e8 - draw backgrounds
4. da83c69 - 7 might be the height a line

Key Changes:

• Background Color Support: Added automatic terminal background color detection via ANSI escape sequences (\x1b]11;?) on Unix-like systems
• Improved Raster Attributes: Modified SIXEL output to include width and height in raster attributes ("1;1;%d;%d" format)
• Image Height Normalization: Ensures image heights are multiples of 6 pixels (SIXEL line requirement) and fills transparent areas with detected background color
• Code Modernization: Switch statement refactoring (removes unnecessary break statements), uses time.Since() instead of time.Now().Sub()
• New Dependencies Added (in example/cmd code only, not core library):
  • golang.org/x/term - for terminal control
  • github.com/nfnt/resize - for image resizing
  • github.com/BurntSushi/graphics-go - for graphics operations

API Compatibility:

• ✅ Fully backward compatible - No breaking changes
• ✅ Encoder struct fields remain identical
• ✅ NewEncoder(io.Writer) signature unchanged
• ✅ Encode(image.Image) error signature unchanged
• ✅ All public interfaces maintained

No Security Fixes Mentioned: No CVEs or security-related changes identified in commits

🎯 Impact Scope Investigation

Usage Analysis in gat codebase:

• Location: internal/gat/gat.go:225 and internal/gat/gat.go:239
• Usage Pattern: sixel.NewEncoder(w).Encode(img)
• Impact: ✅ No impact - gat uses only the basic Encoder API which remains unchanged

Dependency Impact:

• The new dependencies added to go-sixel's go.mod (golang.org/x/term, github.com/nfnt/resize, github.com/BurntSushi/graphics-go) are only used in example/cmd programs, not in the core library
• gat's dependency tree will not be affected beyond the direct go-sixel version bump
• No transitive dependency conflicts expected

Code Modification Requirements:

• ✅ None required - Existing code will work without changes
• The improvements are internal enhancements that don't affect the public API

Test Coverage:

• gat does not have specific tests for sixel encoding functionality in the test files reviewed
• The change is low-risk due to API stability

💡 Recommended Actions

1. ✅ Safe to Merge Immediately - This update can be merged without code modifications

2. Optional Verification (if desired for extra confidence):

   # Build the project to verify compatibility
   go build -o gat
   
   # Run existing tests
   go test ./...

3. What You Get:

   • Better SIXEL rendering with proper background color handling
   • Improved height normalization for better terminal display
   • Internal code quality improvements
   • No functional changes to existing behavior from gat's perspective

4. Post-Merge:

   • No migration work needed
   • No configuration changes required
   • Users may see improved image rendering quality automatically

🔗 Reference Links

• Repository: https://github.com/mattn/go-sixel
• Version Comparison: mattn/go-sixel@v0.0.5...v0.0.8
• Tag v0.0.8: https://github.com/mattn/go-sixel/releases/tag/v0.0.8 (Note: No formal release notes published)
• Tag v0.0.7: https://github.com/mattn/go-sixel/releases/tag/v0.0.7
• Tag v0.0.6: https://github.com/mattn/go-sixel/releases/tag/v0.0.6

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Conclusion: This is a straightforward dependency update with internal improvements to SIXEL rendering quality. The public API remains stable, and gat's usage of the library is unaffected. The update is safe to merge without modifications.

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