feat: initial Swift version

QLPreview/Base.lproj/PreviewViewController.xib

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="23727" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+    <dependencies>
+        <deployment identifier="macosx"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="23727"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <customObject id="-2" userLabel="File's Owner" customClass="PreviewViewController" customModule="QLPreview" customModuleProvider="target">
+            <connections>
+                <outlet property="view" destination="c22-O7-iKe" id="NRM-P4-wb6"/>
+            </connections>
+        </customObject>
+        <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
+        <customObject id="-3" userLabel="Application" customClass="NSObject"/>
+        <customView id="c22-O7-iKe" userLabel="Preview View">
+            <rect key="frame" x="0.0" y="0.0" width="480" height="272"/>
+            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+            <point key="canvasLocation" x="53" y="-36"/>
+        </customView>
+    </objects>
+</document>

QLPreview/Info.plist

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionAttributes</key>
+		<dict>
+			<key>QLIsDataBasedPreview</key>
+			<false/>
+			<key>QLSupportedContentTypes</key>
+			<array>
+				<string>com.apple.itunes.ipa</string>
+				<string>com.apple.application-and-system-extension</string>
+				<string>com.apple.xcode.archive</string>
+			</array>
+			<key>QLSupportsSearchableItems</key>
+			<false/>
+		</dict>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.quicklook.preview</string>
+		<key>NSExtensionPrincipalClass</key>
+		<string>$(PRODUCT_MODULE_NAME).PreviewViewController</string>
+	</dict>
+</dict>
+</plist>

QLPreview/PreviewViewController.swift

@@ -0,0 +1,25 @@
+import Cocoa
+import Quartz // QLPreviewingController
+import WebKit // WebView
+import os // OSLog
+
+// show Console logs with subsystem:de.relikd.QLApps
+private let log = OSLog(subsystem: Bundle.main.bundleIdentifier!, category: "main")
+
+class PreviewViewController: NSViewController, QLPreviewingController {
+	
+	override var nibName: NSNib.Name? {
+		return NSNib.Name("PreviewViewController")
+	}
+	
+	func preparePreviewOfFile(at url: URL) async throws {
+		let html = generateHtml(at: url)
+		// sure, we could use `WKWebView`, but that requires the `com.apple.security.network.client` entitlement
+		//let web = WKWebView(frame: self.view.bounds)
+		let web = WebView(frame: self.view.bounds)
+		web.autoresizingMask = [.width, .height]
+		self.view.addSubview(web)
+		web.mainFrame.loadHTMLString(html, baseURL: nil)  // WebView
+		//web.loadHTMLString(html, baseURL: nil)  // WKWebView
+	}
+}

QLPreview/QLPreview.entitlements

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.files.user-selected.read-only</key>
+	<true/>
+</dict>
+</plist>