Inline terminal rendering parity with the VSCode Terminal

[RussellZager]

Related GitHub Issue

Closes: #10699

Description

This PR implements inline terminal rendering parity with the VSCode Terminal, addressing the issue where raw ANSI bracket codes (e.g., [32m, [1m) were displayed instead of colors and formatting.

Key Changes:

• Backend (src/integrations/terminal/TerminalProcess.ts):

  • Replaced the aggressive strip-ansi usage with a custom removeVSCodeShellIntegration method. This explicitly removes VSCode-specific shell integration sequences (OSC 633, OSC 133) but preserves standard ANSI SGR sequences (colors, formatting).
  • Added stripCursorSequences to remove unsupported cursor movement codes (e.g., clear line, move cursor) to keep the output clean for the webview.

• Frontend (webview-ui/src/components/chat/TerminalOutput.tsx):

  • Created a new TerminalOutput component utilizing the ansi-to-html library.
  • Maps standard ANSI colors to VSCode terminal CSS variables (e.g., var(--vscode-terminal-ansiGreen)), ensuring the output automatically adapts to the user's active color theme.
  • Enabled escapeXML: true to prevent XSS vulnerabilities from command output.

• Integration: Updated CommandExecution.tsx to use TerminalOutput instead of the generic CodeBlock for displaying command output.

Test Procedure

1. Backend Unit Tests:

   • Created src/integrations/terminal/__tests__/TerminalProcess.test.ts to verify that removeVSCodeShellIntegration strictly removes OSC sequences while keeping ANSI colors intact, and that stripCursorSequences removes cursor control codes.
   • Updated src/integrations/terminal/__tests__/TerminalProcessExec.bash.spec.ts to assert that simulated terminal commands return string output containing ANSI codes (e.g., \x1B[31mRed Text\x1B[0m) rather than stripped plain text.

2. Frontend Unit Tests:

   • Created webview-ui/src/components/chat/__tests__/TerminalOutput.spec.tsx to verify:
     • Plain text rendering.
     • ANSI-to-HTML conversion (checking for styled spans).
     • XSS prevention (ensuring HTML tags in output are escaped).

3. Regression Testing:

   • Ran full test suite (npm test) to ensure no regressions in existing terminal or chat functionality.

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Documentation Updates

• No documentation updates are required.

Additional Notes

• Dependency: Added ansi-to-html to webview-ui dependencies (approx. 3KB gzipped impact).
• Security: The implementation uses escapeXML: true in the converter to sanitize output before rendering via dangerouslySetInnerHTML.

Get in Touch

tea_earl_grey_hot

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Important

This PR enhances terminal output rendering by preserving ANSI codes, introducing a new TerminalOutput component, and updating tests for improved functionality and security.

• Behavior:
  • Replaces strip-ansi with removeVSCodeShellIntegration in TerminalProcess.ts to preserve ANSI SGR sequences while removing VSCode-specific sequences.
  • Adds stripCursorSequences to remove unsupported cursor movement codes.
  • Updates CommandExecution.tsx to use TerminalOutput for command output.
• Components:
  • Adds TerminalOutput component in TerminalOutput.tsx using ansi-to-html for ANSI to HTML conversion.
  • Maps ANSI colors to VSCode terminal CSS variables for theme consistency.
• Tests:
  • Adds TerminalProcess.test.ts to test ANSI handling functions.
  • Updates TerminalProcessExec.bash.spec.ts to verify ANSI codes are preserved.
  • Adds TerminalOutput.spec.tsx to test TerminalOutput rendering and XSS prevention.
  • Updates CommandExecution.spec.tsx to test integration with TerminalOutput.

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[roomote]

Rooviewer   See task

Previous issue still unresolved. No new issues found in 56d9de6 (eslint-disable comments and formatting only).

• stripCursorSequences regex /\x1B\[su/g matches literal ESC[su instead of individual ESC[s and ESC[u cursor save/restore sequences -- should use a character class /\x1B\[[su]/g

Previous reviews

• 64258da: Review #1

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}