Function detectLanguage

extensions/cli/src/ui/SyntaxHighlighter.ts:206–243

(code: string)

}

export function detectLanguage(code: string): string {
  // Simple language detection based on common patterns
  const patterns = [
    { regex: /^\s*import\s+.*from\s+['"]/, language: "javascript" },
    { regex: /^\s*const\s+\w+\s*=\s*require\s*\(/, language: "javascript" },
    { regex: /^\s*function\s+\w+\s*\(/, language: "javascript" },
    { regex: /^\s*interface\s+\w+/, language: "typescript" },
    { regex: /^\s*type\s+\w+\s*=/, language: "typescript" },
    { regex: /^\s*def\s+\w+.*:/, language: "python" },
    { regex: /^\s*class\s+\w+.*:/, language: "python" },
    { regex: /^\s*public\s+class\s+\w+/, language: "java" },
    { regex: /^\s*#include\s*</, language: "c" },
    { regex: /^\s*using\s+namespace\s+/, language: "cpp" },
    { regex: /^\s*using\s+System\s*;/, language: "csharp" },
    { regex: /^\s*package\s+main/, language: "go" },
    { regex: /^\s*fn\s+\w+\s*\(/, language: "rust" },
    { regex: /^\s*<\?php/, language: "php" },
    { regex: /^\s*SELECT\s+.*FROM\s+/i, language: "sql" },
    { regex: /^\s*\{\s*$/, language: "json" },
    { regex: /^\s*---\s*$/, language: "yaml" },
    { regex: /^\s*#!/, language: "bash" },
    { regex: /^\s*<(!DOCTYPE html|html)/i, language: "html" },
    { regex: /^\s*@media\s+/, language: "css" },
    { regex: /^\s*#\s+/, language: "markdown" },
  ];

  // Check patterns line by line for multiline code
  const lines = code.split("\n");
  for (const line of lines) {
    for (const pattern of patterns) {
      if (pattern.regex.test(line)) {
        return pattern.language;
      }
    }
  }

  return "javascript"; // default fallback
}