CHGenerator/Sources/Generator/Generators/PageHeadGenerator.swift

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import Foundation
struct PageHeadGenerator {
static let linkPreviewDesiredImageWidth = 1600
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let factory: TemplateFactory
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init(factory: TemplateFactory) {
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self.factory = factory
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}
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func generate(page: Element, language: String, includesCode: Bool = false) -> String {
let metadata = page.localized(for: language)
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var content = [PageHeadTemplate.Key : String]()
content[.author] = page.author
content[.title] = metadata.linkPreviewTitle
content[.description] = metadata.linkPreviewDescription
if let image = page.linkPreviewImage(for: language) {
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// Note: Generate separate destination link for the image,
// since we don't want a single large image for thumbnails.
// Warning: Link preview source path must be relative to root
let linkPreviewImageName = "thumbnail-link.\(image.lastComponentAfter("."))"
let sourceImagePath = page.pathRelativeToRootForContainedInputFile(image)
let destinationImagePath = page.pathRelativeToRootForContainedInputFile(linkPreviewImageName)
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files.requireSingleImage(
source: sourceImagePath,
destination: destinationImagePath,
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requiredBy: page.path,
width: PageHeadGenerator.linkPreviewDesiredImageWidth)
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content[.image] = factory.html.linkPreviewImage(file: linkPreviewImageName)
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}
content[.customPageContent] = page.customHeadContent()
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if includesCode {
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let scriptPath = "assets/js/highlight.js"
let relative = page.relativePathToOtherSiteElement(file: scriptPath)
let includeText = factory.html.scriptInclude(path: relative)
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if let head = content[.customPageContent] {
content[.customPageContent] = head + "\n" + includeText
} else {
content[.customPageContent] = includeText
}
}
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return factory.pageHead.generate(content)
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}
}