Add image gallery block

CHDataManagement/Generator/Blocks/ContentBlock.swift

@@ -17,6 +17,8 @@ enum ContentBlock: String, CaseIterable {
 
     case route
 
+    case gallery
+
     var processor: BlockProcessor.Type {
         switch self {
         case .audio: return AudioBlock.self
@@ -27,6 +29,7 @@ enum ContentBlock: String, CaseIterable {
         case .labels: return LabelsBlock.self
         case .screens: return PhoneScreensBlock.self
         case .route: return RouteBlock.self
+        case .gallery: return GalleryBlock.self
         }
     }
 }

CHDataManagement/Generator/Blocks/GalleryBlock.swift

@@ -0,0 +1,46 @@
+
+struct GalleryBlock: BlockLineProcessor {
+
+    static let blockId: ContentBlock = .gallery
+
+    let content: Content
+
+    let results: PageGenerationResults
+
+    let language: ContentLanguage
+
+    init(content: Content, results: PageGenerationResults, language: ContentLanguage) {
+        self.content = content
+        self.results = results
+        self.language = language
+    }
+
+    private var imageWidth: Int {
+        content.settings.pages.contentWidth
+    }
+
+    func process(_ lines: [String], markdown: Substring) -> String {
+        var images = [FileResource]()
+
+        for line in lines {
+            let imageId = line.trimmed
+            guard !imageId.isEmpty else { continue }
+            guard let image = content.image(imageId) else {
+                results.missing(file: imageId, source: "Route block")
+                continue
+            }
+            images.append(image)
+        }
+        guard let firstImage = images.first else { return "" }
+
+        let imageSets = images.map {
+            $0.imageSet(width: imageWidth, height: imageWidth, language: language)
+        }
+        imageSets.forEach(results.require)
+        let id = firstImage.id.replacingOccurrences(of: ".", with: "-")
+        let gallery = ImageGallery(id: id, images: imageSets, standalone: true)
+        results.require(footer: gallery.standaloneFooter)
+        results.require(headers: .swiperJs, .swiperCss)
+        return gallery.content
+    }
+}

CHDataManagement/Generator/Page Generators/FeedPageGenerator.swift

@@ -84,14 +84,7 @@ final class FeedPageGenerator {
     }
 
     func swiperInitScript(posts: [FeedEntryData]) -> String {
-        var result = "<script> window.onload = () => { "
-        for post in posts {
-            guard post.requiresSwiper else {
-                continue
-            }
-            result += ImageGallery.swiperInit(id: post.entryId)
-        }
-        result += "}; </script>"
-        return result
+        let ids = posts.filter { $0.requiresSwiper }.map { $0.entryId }
+        return ImageGallery.combinedFootor(ids: ids)
     }
 }