website/Website/ViewModels/BlogPostViewModel.cs

using System;
using Markdig;
using Pek.Markdig.HighlightJs;
using Website.Models;

namespace Website.ViewModels
{
	public class BlogPostViewModel
	{
		public BlogPostViewModel(BlogPost blogPost, bool preview) {
			Id = blogPost.Id;
			Title = blogPost.Title;
			Timestamp = FormatTimestamp(blogPost.Timestamp);
			Url = blogPost.Url;
			Content = preview ? blogPost.Draft : blogPost.Content;
		}

		private static string GetDaySuffix(int day) {
			switch (day) {
				case 1:
				case 21:
				case 31:
					return @"\s\t";
				case 2:
				case 22:
					return @"\n\d";
				case 3:
				case 23:
					return @"\r\d";
				default:
					return @"\t\h";
			}
		}

		private static string FormatTimestamp(DateTime timestamp) {
			var suffix = GetDaySuffix(timestamp.Day);
			return timestamp.ToString($@"dddd \t\h\e d{suffix} \o\f MMMM yyyy");
		}

		private static MarkdownPipeline GetPipeline() => new MarkdownPipelineBuilder()
		                                                 //.UseAdvancedExtensions()
		                                                 .UseAutoLinks()
		                                                 .UseSoftlineBreakAsHardlineBreak()
		                                                 .UseHighlightJs()
		                                                 .Build();

		public int Id { get; }
		public string Title { get; }
		public string Content { get; protected set; }
		public string Timestamp { get; }
		public string Url { get; }
		public string ContentHtml => Markdown.ToHtml(Content, GetPipeline()).Trim();
	}
}