fission-ai__openspec/openspec/changes/archive/2025-08-13-add-diff-command/tasks.md

Implementation Tasks

1. Core Implementation

• 1.1 Create src/core/diff.ts with diff logic
• 1.2 Implement change directory scanning
• 1.3 Implement file comparison using unified diff format
• 1.4 Add color support for terminal output

2. CLI Integration

• 2.1 Add diff command to src/cli/index.ts
• 2.2 Implement interactive change selection when no argument provided
• 2.3 Add error handling for missing changes

3. Enhancements

• 3.1 Replace with jest-diff for professional diff output
• 3.2 Improve file headers with status and statistics
• 3.3 Add summary view with file counts and line changes

4. Testing

• 4.1 Test diff generation for modified files
• 4.2 Test handling of new files
• 4.3 Test handling of deleted files
• 4.4 Test interactive mode