Add terminal-to-html tool for converting terminal output to HTML

[simonw]

New tool that accepts terminal output via paste (RTF, HTML, or plain text) and converts it to HTML with proper formatting. Features include:

• RTF parsing for colored terminal output
• Direct HTML passthrough when available
• Plain text wrapping in

   tags

• Copy to clipboard functionality
• Save to GitHub Gist with GistPreview URL
• Terminal-themed UI (green on black with Courier font)
• Mobile-friendly responsive design

🤖 Generated with Claude Code

[claude]

Claude finished @simonw's task —— View job

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Code Review Complete

Reviewing the terminal-to-html tool implementation:

• Read and analyze the terminal-to-html.html file
• Evaluate code quality and structure
• Check for security vulnerabilities
• Assess performance considerations
• Review error handling and edge cases
• Check for potential bugs
• Evaluate test coverage
• Provide comprehensive feedback

Review Feedback

Code Quality & Structure ✅

The code is well-structured with clean separation between HTML, CSS, and JavaScript. The terminal aesthetic is nicely implemented with consistent green-on-black theming and good responsive design.

Strengths:

• Clean, semantic HTML structure
• Good CSS organization with clear class naming
• Modular JavaScript functions with clear responsibilities
• Responsive design with mobile-friendly breakpoints
• Consistent terminal theme implementation

Security Concerns ⚠️

Several security considerations identified:

1. RTF Parsing Vulnerability (terminal-to-html.html:285-438): The RTF parser directly processes user input without sufficient validation. Malicious RTF could potentially trigger unexpected behavior.

2. XSS Prevention ✅: Good use of escapeHtml() function (terminal-to-html.html:440-444) to sanitize text content before inserting into DOM.

3. GitHub Token Storage (terminal-to-html.html:447-475): Storing tokens in localStorage is appropriate for this use case, though users should be aware tokens persist until manually cleared.

4. External Dependencies: The tool opens GitHub auth in a popup (terminal-to-html.html:644) which could be concerning, but the domain appears to be controlled by the same author.

Performance Considerations ⚠️

1. RTF Parser Efficiency (terminal-to-html.html:321-435): The character-by-character parsing loop could be slow for large RTF inputs. Consider adding input size limits or progress indicators.

2. DOM Manipulation: Multiple innerHTML assignments could be inefficient for large outputs, but acceptable for expected use cases.

3. Memory Usage: Large clipboard data isn't validated for size, which could cause browser performance issues.

Potential Bugs & Edge Cases ⚠️

1. RTF Color Table Edge Case (terminal-to-html.html:268-283): The parser assumes color definitions are well-formed. Malformed RTF could cause parsing errors.

2. Unicode Handling (terminal-to-html.html:375-386): Negative Unicode codepoint handling (65536 + codePoint) may not work correctly for all edge cases.

3. Clipboard API Browser Support: The code assumes navigator.clipboard is available but doesn't gracefully degrade for older browsers.

4. Error Recovery: RTF parsing errors (terminal-to-html.html:588-591) stop processing entirely rather than attempting partial recovery.

Missing Error Handling

1. Network Failures: GitHub API calls (terminal-to-html.html:483-502) need better error specificity (rate limits, auth failures, network issues).

2. Clipboard Access: No fallback for when clipboard API is unavailable or permission denied.

3. Large Input Validation: No size limits on pasted content could cause browser crashes.

Test Coverage ❌

Critical Gap: No automated tests are included. Recommend adding:

• Unit tests for RTF parsing functions
• Integration tests for clipboard handling
• Edge case tests for malformed RTF input
• Browser compatibility tests for clipboard API

Recommendations for Improvement

1. Add Input Validation: Implement size limits and RTF format validation
2. Improve Error Messages: Provide more specific error feedback to users
3. Add Tests: Critical for RTF parsing complexity
4. Browser Compatibility: Add fallbacks for older browsers
5. Performance: Consider streaming or chunked processing for large inputs
6. Documentation: Add JSDoc comments for complex functions

Security Recommendations

1. Consider adding RTF input sanitization beyond current escape handling
2. Add CSP headers when deploying to prevent XSS
3. Document the GitHub auth flow and token permissions clearly

Overall Assessment

This is a well-crafted tool with good UX design and solid core functionality. The RTF parsing implementation is sophisticated and handles most common cases well. Main concerns are around input validation, error handling, and test coverage. The security posture is generally good with proper HTML escaping, though RTF parsing deserves additional scrutiny.

Verdict: Approve with recommendations for security hardening and test coverage improvements.

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