rune
c3abc5a748
Covers the per-file license-header comment (~80 Swift files) plus the contact/website links in README.md, PRIVACY.md, and SECURITY.md.
541 lines
23 KiB
Swift
541 lines
23 KiB
Swift
//
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// ConversationExportService.swift
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// Confab
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//
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// Shared conversation export: Markdown, HTML, and PDF
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//
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// SPDX-License-Identifier: PolyForm-Noncommercial-1.0.0
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// Copyright (C) 2026 Rune Olsen
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//
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// This file is part of Confab.
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//
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// Confab is licensed under the PolyForm Noncommercial License 1.0.0.
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// You may use, study, modify, and share it for any noncommercial
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// purpose. Commercial use — including selling Confab or any part of
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// it, standalone or bundled into another product or service —
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// requires a separate commercial license from the copyright holder.
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//
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// See the LICENSE file or
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// <https://polyformproject.org/licenses/noncommercial/1.0.0> for
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// the full license text. For commercial licensing, contact Rune
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// Olsen via <https://confab.no>.
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import AppKit
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import Foundation
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import WebKit
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enum ConversationExportService {
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// MARK: - Markdown
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nonisolated static func markdown(messages: [Message]) -> String {
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messages.map { msg in
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let header = msg.role == .user ? "**User**" : "**Assistant**"
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return "\(header)\n\n\(msg.content)"
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}.joined(separator: "\n\n---\n\n")
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}
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// MARK: - HTML
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nonisolated private static let css = """
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:root { color-scheme: light dark; }
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html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
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::-webkit-scrollbar { display: none; }
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body { font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif; \
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font-size: 14px; color: #1a1a1a; background: #ffffff; max-width: 820px; margin: 40px auto; \
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padding: 0 24px; line-height: 1.5; }
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h1 { font-size: 22px; border-bottom: 1px solid #ddd; padding-bottom: 12px; }
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.message { margin: 20px 0; padding: 12px 16px; border-radius: 8px; border-left: 4px solid transparent; \
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break-inside: avoid; page-break-inside: avoid; }
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.message.user { background: #f5f7fa; border-left-color: #4a90d9; }
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.message.assistant { background: #fafafa; border-left-color: #8a8a8a; }
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.role { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; \
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color: #666; margin-bottom: 8px; }
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.message p { margin: 8px 0; }
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.message h1 { font-size: 19px; margin: 12px 0 6px; }
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.message h2 { font-size: 17px; margin: 12px 0 6px; }
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.message h3 { font-size: 15.5px; margin: 12px 0 6px; }
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.message h4, .message h5, .message h6 { font-size: 14px; margin: 12px 0 6px; }
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.message ul, .message ol { margin: 8px 0; padding-left: 24px; }
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.message blockquote { margin: 8px 0; padding: 4px 12px; border-left: 3px solid #ccc; color: #555; }
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.message code { font-family: "SF Mono", Menlo, Consolas, monospace; font-size: 0.9em; \
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background: #eef0f2; padding: 1px 5px; border-radius: 4px; }
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.message pre { background: #1e1e1e; color: #e8e8e8; padding: 12px 14px; border-radius: 6px; \
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overflow-x: auto; }
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.message pre code { background: none; padding: 0; color: inherit; }
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.message hr { border: none; border-top: 1px solid #ddd; margin: 16px 0; }
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.message a { color: #4a90d9; }
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.message table { border-collapse: collapse; margin: 10px 0; width: 100%; }
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.message th, .message td { border: 1px solid #ddd; padding: 6px 10px; text-align: left; }
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.message th { background: #f0f2f4; font-weight: 600; }
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@media (prefers-color-scheme: dark) {
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body { color: #e8e8e8; background: #1c1c1e; }
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h1 { border-bottom-color: #3a3a3c; }
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.message.user { background: #24303d; border-left-color: #5aa2f0; }
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.message.assistant { background: #262626; border-left-color: #9a9a9a; }
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.role { color: #a8a8a8; }
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.message blockquote { border-left-color: #555; color: #bbb; }
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.message code { background: #2e2e2e; color: #e0e0e0; }
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.message hr { border-top-color: #3a3a3c; }
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.message a { color: #6fb1f0; }
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.message th, .message td { border-color: #3a3a3c; }
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.message th { background: #2a2a2c; }
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}
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"""
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// PDF is baked at export time — it can't respond to prefers-color-scheme live like an
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// HTML file opened in a browser can, and empirically the print pipeline ignores that media
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// query entirely regardless (confirmed: identical CSS printed light even with the webview
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// forced into dark appearance). So PDF gets its own always-dark stylesheet, applied
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// unconditionally rather than behind a media query. print-color-adjust: exact is required
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// too — browsers/WebKit's print pipeline strips background colors by default to save ink
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// unless told otherwise; without it every background here silently prints white.
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nonisolated private static let pdfCss = """
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* { -webkit-print-color-adjust: exact; print-color-adjust: exact; color-adjust: exact; }
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:root { color-scheme: dark; }
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html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
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::-webkit-scrollbar { display: none; }
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body { font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif; \
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font-size: 14px; color: #e8e8e8; background: #1c1c1e; max-width: 820px; margin: 40px auto; \
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padding: 0 24px; line-height: 1.5; }
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h1 { font-size: 22px; border-bottom: 1px solid #3a3a3c; padding-bottom: 12px; }
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.message { margin: 20px 0; padding: 12px 16px; border-radius: 8px; border-left: 4px solid transparent; \
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break-inside: avoid; page-break-inside: avoid; }
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.message.user { background: #24303d; border-left-color: #5aa2f0; }
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.message.assistant { background: #262626; border-left-color: #9a9a9a; }
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.role { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; \
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color: #a8a8a8; margin-bottom: 8px; }
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.message p { margin: 8px 0; }
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.message h1 { font-size: 19px; margin: 12px 0 6px; }
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.message h2 { font-size: 17px; margin: 12px 0 6px; }
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.message h3 { font-size: 15.5px; margin: 12px 0 6px; }
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.message h4, .message h5, .message h6 { font-size: 14px; margin: 12px 0 6px; }
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.message ul, .message ol { margin: 8px 0; padding-left: 24px; }
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.message blockquote { margin: 8px 0; padding: 4px 12px; border-left: 3px solid #555; color: #bbb; }
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.message code { font-family: "SF Mono", Menlo, Consolas, monospace; font-size: 0.9em; \
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background: #2e2e2e; color: #e0e0e0; padding: 1px 5px; border-radius: 4px; }
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.message pre { background: #111; color: #e8e8e8; padding: 12px 14px; border-radius: 6px; \
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overflow-x: auto; }
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.message pre code { background: none; padding: 0; color: inherit; }
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.message hr { border: none; border-top: 1px solid #3a3a3c; margin: 16px 0; }
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.message a { color: #6fb1f0; }
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.message table { border-collapse: collapse; margin: 10px 0; width: 100%; }
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.message th, .message td { border: 1px solid #3a3a3c; padding: 6px 10px; text-align: left; }
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.message th { background: #2a2a2c; font-weight: 600; }
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"""
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nonisolated static func html(name: String, messages: [Message], forceDarkCSS: Bool = false) -> String {
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let body = messages.map { msg -> String in
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let roleLabel = msg.role == .user ? "User" : "Assistant"
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let roleClass = msg.role == .user ? "user" : "assistant"
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let rendered = renderMarkdownBody(htmlEscape(msg.content))
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return """
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<div class="message \(roleClass)">
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<div class="role">\(roleLabel)</div>
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\(rendered)
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</div>
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"""
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}.joined(separator: "\n")
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return """
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>\(htmlEscape(name))</title>
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<style>\(forceDarkCSS ? pdfCss : css)</style>
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</head>
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<body>
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<h1>\(htmlEscape(name))</h1>
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\(body)
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</body>
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</html>
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"""
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}
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// MARK: - PDF
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enum PDFError: LocalizedError {
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case generationFailed
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var errorDescription: String? { "Failed to generate PDF" }
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}
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/// Uses WKWebView's real print pipeline (NSPrintOperation), not createPDF(). Confirmed
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/// empirically by comparing against a normal reference PDF: createPDF() never paginates —
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/// it captures the webview's frame verbatim, or auto-grows to ONE continuous page matching
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/// full content height for overflow (a single page many thousands of points tall for a long
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/// conversation). That's a fundamentally different, non-standard document shape from any
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/// normal PDF, which is what actually made ordinarily-sized text read as "huge" — there was
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/// no page of a familiar size to judge it against. Printing through NSPrintOperation with a
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/// real A4 paper size gives genuine multi-page pagination, matching what any other app's
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/// "export/print to PDF" produces.
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static func pdfData(name: String, messages: [Message]) async throws -> Data {
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let htmlString = html(name: name, messages: messages, forceDarkCSS: true)
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let webView = WKWebView(frame: NSRect(x: 0, y: 0, width: 850, height: 1100))
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webView.pageZoom = 1.0
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let delegate = PDFLoadDelegate()
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webView.navigationDelegate = delegate
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try await delegate.load(htmlString, in: webView)
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let tempURL = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString + ".pdf")
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defer { try? FileManager.default.removeItem(at: tempURL) }
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let printInfo = NSPrintInfo()
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printInfo.paperSize = NSSize(width: 595, height: 842) // A4
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printInfo.topMargin = 36
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printInfo.bottomMargin = 36
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printInfo.leftMargin = 36
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printInfo.rightMargin = 36
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printInfo.horizontalPagination = .fit
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printInfo.jobDisposition = .save
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printInfo.dictionary()[NSPrintInfo.AttributeKey.jobSavingURL] = tempURL
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let printOp = webView.printOperation(with: printInfo)
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printOp.showsPrintPanel = false
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printOp.showsProgressPanel = false
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// NSPrintOperation.run() blocks synchronously, so it's dispatched off the main actor
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// to avoid freezing the UI while a long conversation paginates.
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let success = await withCheckedContinuation { (continuation: CheckedContinuation<Bool, Never>) in
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DispatchQueue.global(qos: .userInitiated).async {
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continuation.resume(returning: printOp.run())
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}
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}
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guard success, let data = try? Data(contentsOf: tempURL) else {
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throw PDFError.generationFailed
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}
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return data
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}
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private final class PDFLoadDelegate: NSObject, WKNavigationDelegate {
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private var continuation: CheckedContinuation<Void, Error>?
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func load(_ html: String, in webView: WKWebView) async throws {
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try await withCheckedThrowingContinuation { (cont: CheckedContinuation<Void, Error>) in
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self.continuation = cont
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webView.loadHTMLString(html, baseURL: nil)
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}
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}
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func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
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continuation?.resume()
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continuation = nil
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}
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func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
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continuation?.resume(throwing: error)
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continuation = nil
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}
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func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
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continuation?.resume(throwing: error)
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continuation = nil
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}
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}
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// MARK: - File writing
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nonisolated static func writeToDownloads(_ content: String, filename: String) -> URL? {
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let downloads = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask).first
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?? FileManager.default.temporaryDirectory
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let fileURL = downloads.appendingPathComponent(filename)
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do {
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try content.write(to: fileURL, atomically: true, encoding: .utf8)
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return fileURL
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} catch {
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return nil
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}
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}
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nonisolated static func writeToDownloads(_ data: Data, filename: String) -> URL? {
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let downloads = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask).first
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?? FileManager.default.temporaryDirectory
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let fileURL = downloads.appendingPathComponent(filename)
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do {
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try data.write(to: fileURL, options: .atomic)
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return fileURL
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} catch {
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return nil
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}
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}
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// MARK: - Markdown → HTML rendering (scoped to what chat messages actually contain —
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// headers, bold/italic, inline code, fenced code blocks, lists, blockquotes, links,
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// horizontal rules, tables, paragraphs. Not full CommonMark/GFM.)
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nonisolated private static func htmlEscape(_ text: String) -> String {
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var result = text
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result = result.replacingOccurrences(of: "&", with: "&")
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result = result.replacingOccurrences(of: "<", with: "<")
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result = result.replacingOccurrences(of: ">", with: ">")
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result = result.replacingOccurrences(of: "\"", with: """)
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result = result.replacingOccurrences(of: "'", with: "'")
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return result
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}
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/// Renders already-HTML-escaped markdown text into an HTML body fragment.
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nonisolated static func renderMarkdownBody(_ escapedContent: String) -> String {
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let lines = escapedContent.components(separatedBy: "\n")
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var html = ""
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var index = 0
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var paragraphLines: [String] = []
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var listBuffer: [String] = []
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var listTag: String?
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func flushParagraph() {
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guard !paragraphLines.isEmpty else { return }
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let joined = paragraphLines.joined(separator: "<br>\n")
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html += "<p>\(renderInline(joined))</p>\n"
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paragraphLines = []
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}
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func flushList() {
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guard let tag = listTag, !listBuffer.isEmpty else { return }
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html += "<\(tag)>\n"
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for item in listBuffer { html += "<li>\(renderInline(item))</li>\n" }
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html += "</\(tag)>\n"
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listBuffer = []
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listTag = nil
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}
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while index < lines.count {
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let line = lines[index].trimmingCharacters(in: .whitespaces)
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// Fenced code block
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if line.hasPrefix("```") {
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flushParagraph(); flushList()
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let lang = String(line.dropFirst(3)).trimmingCharacters(in: .whitespaces)
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var codeLines: [String] = []
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index += 1
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while index < lines.count, !lines[index].trimmingCharacters(in: .whitespaces).hasPrefix("```") {
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codeLines.append(lines[index])
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index += 1
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}
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let classAttr = lang.isEmpty ? "" : " class=\"language-\(lang)\""
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html += "<pre><code\(classAttr)>\(codeLines.joined(separator: "\n"))</code></pre>\n"
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if index < lines.count { index += 1 } // skip closing ```
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continue
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}
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// Headers
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if let header = headerMatch(line) {
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flushParagraph(); flushList()
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html += "<h\(header.level)>\(renderInline(header.text))</h\(header.level)>\n"
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index += 1
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continue
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}
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// Horizontal rule
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if isHorizontalRule(line) {
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flushParagraph(); flushList()
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html += "<hr>\n"
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index += 1
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continue
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}
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// GFM-style pipe table: a row line immediately followed by a valid separator row
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if line.contains("|"), index + 1 < lines.count,
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isTableSeparatorRow(lines[index + 1].trimmingCharacters(in: .whitespaces)) {
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flushParagraph(); flushList()
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let headerCells = splitTableRow(line)
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let alignments = tableAlignments(from: lines[index + 1].trimmingCharacters(in: .whitespaces))
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index += 2
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var bodyRows: [[String]] = []
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while index < lines.count {
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let rowLine = lines[index].trimmingCharacters(in: .whitespaces)
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guard rowLine.contains("|"), !rowLine.isEmpty else { break }
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bodyRows.append(splitTableRow(rowLine))
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index += 1
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}
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html += renderTable(headerCells: headerCells, alignments: alignments, bodyRows: bodyRows)
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continue
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}
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// Blockquote (escaped ">" is ">")
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if line.hasPrefix("> ") || line == ">" {
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flushParagraph(); flushList()
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var quoteLines: [String] = []
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while index < lines.count {
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let quoteLine = lines[index].trimmingCharacters(in: .whitespaces)
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if quoteLine.hasPrefix("> ") {
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quoteLines.append(String(quoteLine.dropFirst(5)))
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} else if quoteLine == ">" {
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quoteLines.append("")
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} else {
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break
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}
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index += 1
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}
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html += "<blockquote><p>\(renderInline(quoteLines.joined(separator: "<br>\n")))</p></blockquote>\n"
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continue
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}
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// Unordered list
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if line.hasPrefix("- ") || line.hasPrefix("* ") || line.hasPrefix("+ ") {
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flushParagraph()
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if listTag == "ol" { flushList() }
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listTag = "ul"
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listBuffer.append(String(line.dropFirst(2)))
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index += 1
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continue
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}
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// Ordered list
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if let text = orderedListMatch(line) {
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flushParagraph()
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if listTag == "ul" { flushList() }
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listTag = "ol"
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listBuffer.append(text)
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index += 1
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continue
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}
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// Blank line — paragraph/list separator
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if line.isEmpty {
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flushParagraph(); flushList()
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index += 1
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continue
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}
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// Plain paragraph text
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flushList()
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paragraphLines.append(line)
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index += 1
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}
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flushParagraph()
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flushList()
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return html
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}
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nonisolated private static func headerMatch(_ line: String) -> (level: Int, text: String)? {
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var level = 0
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var idx = line.startIndex
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while idx < line.endIndex, line[idx] == "#", level < 6 {
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level += 1
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idx = line.index(after: idx)
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}
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guard level > 0, idx < line.endIndex, line[idx] == " " else { return nil }
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return (level, String(line[line.index(after: idx)...]))
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}
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nonisolated private static func orderedListMatch(_ line: String) -> String? {
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guard let dotRange = line.range(of: ". ") else { return nil }
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let prefix = line[line.startIndex..<dotRange.lowerBound]
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guard !prefix.isEmpty, prefix.allSatisfy(\.isNumber) else { return nil }
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|
return String(line[dotRange.upperBound...])
|
|
}
|
|
|
|
nonisolated private static func isHorizontalRule(_ line: String) -> Bool {
|
|
guard line.count >= 3 else { return false }
|
|
return line.allSatisfy { $0 == "-" } || line.allSatisfy { $0 == "*" } || line.allSatisfy { $0 == "_" }
|
|
}
|
|
|
|
/// A GFM table separator row looks like `| --- | :--: | ---: |` — pipe-delimited cells
|
|
/// made up of dashes with optional leading/trailing colons for alignment.
|
|
nonisolated private static func isTableSeparatorRow(_ line: String) -> Bool {
|
|
guard line.contains("-") else { return false }
|
|
let cells = splitTableRow(line)
|
|
guard !cells.isEmpty else { return false }
|
|
return cells.allSatisfy { cell in
|
|
var core = cell.trimmingCharacters(in: .whitespaces)
|
|
guard !core.isEmpty else { return false }
|
|
if core.hasPrefix(":") { core.removeFirst() }
|
|
if core.hasSuffix(":") { core.removeLast() }
|
|
return !core.isEmpty && core.allSatisfy { $0 == "-" }
|
|
}
|
|
}
|
|
|
|
nonisolated private static func splitTableRow(_ line: String) -> [String] {
|
|
var trimmed = line.trimmingCharacters(in: .whitespaces)
|
|
if trimmed.hasPrefix("|") { trimmed.removeFirst() }
|
|
if trimmed.hasSuffix("|") { trimmed.removeLast() }
|
|
return trimmed.components(separatedBy: "|").map { $0.trimmingCharacters(in: .whitespaces) }
|
|
}
|
|
|
|
nonisolated private static func tableAlignments(from separatorLine: String) -> [String] {
|
|
splitTableRow(separatorLine).map { cell in
|
|
let left = cell.hasPrefix(":")
|
|
let right = cell.hasSuffix(":")
|
|
if left && right { return "center" }
|
|
if right { return "right" }
|
|
if left { return "left" }
|
|
return ""
|
|
}
|
|
}
|
|
|
|
nonisolated private static func renderTable(headerCells: [String], alignments: [String], bodyRows: [[String]]) -> String {
|
|
func alignAttr(_ i: Int) -> String {
|
|
guard i < alignments.count, !alignments[i].isEmpty else { return "" }
|
|
return " style=\"text-align:\(alignments[i])\""
|
|
}
|
|
var html = "<table>\n<thead>\n<tr>\n"
|
|
for (i, cell) in headerCells.enumerated() {
|
|
html += "<th\(alignAttr(i))>\(renderInline(cell))</th>\n"
|
|
}
|
|
html += "</tr>\n</thead>\n<tbody>\n"
|
|
for row in bodyRows {
|
|
html += "<tr>\n"
|
|
for (i, cell) in row.enumerated() {
|
|
html += "<td\(alignAttr(i))>\(renderInline(cell))</td>\n"
|
|
}
|
|
html += "</tr>\n"
|
|
}
|
|
html += "</tbody>\n</table>\n"
|
|
return html
|
|
}
|
|
|
|
/// Applies inline markdown (code, links, bold, italic) to an already-HTML-escaped line.
|
|
nonisolated private static func renderInline(_ escapedText: String) -> String {
|
|
var text = escapedText
|
|
var codeSpans: [String] = []
|
|
|
|
text = replacingCaptures(text, pattern: #"`([^`]+?)`"#) { match in
|
|
let token = "\u{E000}\(codeSpans.count)\u{E000}"
|
|
codeSpans.append("<code>\(match)</code>")
|
|
return token
|
|
}
|
|
|
|
text = replacingCaptures(text, pattern: #"\[([^\]]+)\]\(([^)]+)\)"#, groups: 2) { groups in
|
|
"<a href=\"\(groups[1])\">\(groups[0])</a>"
|
|
}
|
|
|
|
text = replacingCaptures(text, pattern: #"\*\*([^*]+?)\*\*"#) { "<strong>\($0)</strong>" }
|
|
text = replacingCaptures(text, pattern: #"__([^_]+?)__"#) { "<strong>\($0)</strong>" }
|
|
text = replacingCaptures(text, pattern: #"\*([^*]+?)\*"#) { "<em>\($0)</em>" }
|
|
|
|
for (i, span) in codeSpans.enumerated() {
|
|
text = text.replacingOccurrences(of: "\u{E000}\(i)\u{E000}", with: span)
|
|
}
|
|
return text
|
|
}
|
|
|
|
nonisolated private static func replacingCaptures(
|
|
_ text: String,
|
|
pattern: String,
|
|
transform: @escaping (String) -> String
|
|
) -> String {
|
|
guard let regex = try? Regex(pattern) else { return text }
|
|
return text.replacing(regex) { match in
|
|
transform(match.output.count > 1 ? String(match.output[1].substring ?? "") : "")
|
|
}
|
|
}
|
|
|
|
nonisolated private static func replacingCaptures(
|
|
_ text: String,
|
|
pattern: String,
|
|
groups: Int,
|
|
transform: @escaping ([String]) -> String
|
|
) -> String {
|
|
guard let regex = try? Regex(pattern) else { return text }
|
|
return text.replacing(regex) { match in
|
|
let captured = (1...groups).map { i in
|
|
match.output.count > i ? String(match.output[i].substring ?? "") : ""
|
|
}
|
|
return transform(captured)
|
|
}
|
|
}
|
|
}
|