extension Content {

    private func makeCleanAbsolutePath(_ path: String) -> String {
        ("/" + path).replacingOccurrences(of: "//", with: "/")
    }

    // MARK: Paths to items

    func absoluteUrlPrefixForTag(_ tag: Tag, language: ContentLanguage) -> String {
        makeCleanAbsolutePath(settings.paths.tagsOutputFolderPath + "/" + tag.localized(in: language).urlComponent)
    }

    func absoluteUrlToTag(_ tag: Tag, language: ContentLanguage) -> String {
        absoluteUrlPrefixForTag(tag, language: language) + ".html"
    }

    // MARK: Find items by id

    func page(_ pageId: String) -> Page? {
        pages.first { $0.id == pageId }
    }

    func image(_ imageId: String) -> FileResource? {
        files.first { $0.id == imageId && $0.type.isImage }
    }

    func video(_ videoId: String) -> FileResource? {
        files.first { $0.id == videoId && $0.type.isVideo }
    }

    func file(_ fileId: String) -> FileResource? {
        files.first { $0.id == fileId }
    }

    func tag(_ tagId: String) -> Tag? {
        tags.first { $0.id == tagId }
    }

    func navigationBar(in language: ContentLanguage) -> [NavigationBar.Link] {
        settings.navigationItems.map {
            .init(text: $0.title(in: language),
                  url: $0.absoluteUrl(in: language))
        }
    }
}