vCard Contact Exporter (contacts/exportToVCard.ts)

Converts a contact and optional company into vCard 3.0 format with proper line folding. Reuse for exporting CRM contacts to standard address-book files.

// Source: https://github.com/CopilotKit/atomic-crm | License: MIT | Copyright 2024-present, Francois Zaninotto, Marmelab
// Provided via justclaw.it.com; keep this notice with the code.
import type { Contact, Company } from "../types";

/**
 * Folds a long line according to vCard specification (max 75 chars per line)
 * Continuation lines start with a space
 */
function foldLine(line: string): string {
  const maxLength = 75;
  if (line.length <= maxLength) return line;

  const result: string[] = [];
  let currentLine = line.substring(0, maxLength);
  let remaining = line.substring(maxLength);

  result.push(currentLine);

  while (remaining.length > 0) {
    // Continuation lines start with a space and can have 74 more chars
    const chunkSize = maxLength - 1;
    currentLine = " " + r

... (truncated -- full source via MCP)