Simplify images, tag overview

CHDataManagement/Generator/ImageSet.swift

@@ -0,0 +1,52 @@
+import Foundation
+
+struct ImageSet {
+
+    let image: FileResource
+
+    let maxWidth: Int
+
+    let maxHeight: Int
+
+    let quality: CGFloat
+
+    let description: String
+
+    init(image: FileResource, maxWidth: Int, maxHeight: Int, description: String, quality: CGFloat = 0.7) {
+        self.image = image
+        self.maxWidth = maxWidth
+        self.maxHeight = maxHeight
+        self.description = description
+        self.quality = quality
+    }
+
+    var jobs: [ImageVersion] {
+        let type = image.type
+
+        let width2x = maxWidth * 2
+        let height2x = maxHeight * 2
+
+        return [
+            .init(image: image, type: .avif, maximumWidth: maxWidth, maximumHeight: maxHeight, quality: quality),
+            .init(image: image, type: .avif, maximumWidth: width2x, maximumHeight: height2x, quality: quality),
+            .init(image: image, type: .webp, maximumWidth: maxWidth, maximumHeight: maxHeight, quality: quality),
+            .init(image: image, type: .webp, maximumWidth: width2x, maximumHeight: height2x, quality: quality),
+            .init(image: image, type: type, maximumWidth: maxWidth, maximumHeight: maxHeight, quality: quality),
+            .init(image: image, type: type, maximumWidth: width2x, maximumHeight: height2x, quality: quality)
+        ]
+    }
+
+    var content: String {
+        let fileExtension = image.type.fileExtension.map { "." + $0 } ?? ""
+
+        let prefix1x = "/\(image.outputImageFolder)/\(maxWidth)x\(maxHeight)"
+        let prefix2x = "/\(image.outputImageFolder)/\(maxWidth*2)x\(maxHeight*2)"
+
+        var result = "<picture>"
+        result += "<source type='image/avif' srcset='\(prefix1x).avif 1x, \(prefix2x).avif 2x'/>"
+        result += "<source type='image/webp' srcset='\(prefix1x).webm 1x, \(prefix1x).webm 2x'/>"
+        result += "<img srcset='\(prefix2x)\(fileExtension) 2x' src='\(prefix1x)\(fileExtension)' loading='lazy' alt='\(description.htmlEscaped())'/>"
+        result += "</picture>"
+        return result
+    }
+}