// Copyright (c) Microsoft Corporation
// The Microsoft Corporation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.IO;
using Markdig;
namespace Microsoft.PowerToys.FilePreviewCommon
{
public static class MarkdownHelper
{
///
/// Markdown HTML header for light theme.
///
private static readonly string HtmlLightHeader = "
";
///
/// Markdown HTML header for dark theme.
///
private static readonly string HtmlDarkHeader = "
";
///
/// Markdown HTML footer.
///
private static readonly string HtmlFooter = "
";
public static string MarkdownHtml(string fileContent, string theme, string filePath, ImagesBlockedCallBack imagesBlockedCallBack)
{
var htmlHeader = theme == "dark" ? HtmlDarkHeader : HtmlLightHeader;
// Extension to modify markdown AST.
HTMLParsingExtension extension = new HTMLParsingExtension(imagesBlockedCallBack);
extension.FilePath = Path.GetDirectoryName(filePath) ?? string.Empty;
// if you have a string with double space, some people view it as a new line.
// while this is against spec, even GH supports this. Technically looks like GH just trims whitespace
// https://github.com/microsoft/PowerToys/issues/10354
var softlineBreak = new Markdig.Extensions.Hardlines.SoftlineBreakAsHardlineExtension();
MarkdownPipelineBuilder pipelineBuilder;
pipelineBuilder = new MarkdownPipelineBuilder().UseAdvancedExtensions().UseEmojiAndSmiley().UseYamlFrontMatter().UseMathematics();
pipelineBuilder.Extensions.Add(extension);
pipelineBuilder.Extensions.Add(softlineBreak);
MarkdownPipeline pipeline = pipelineBuilder.Build();
string parsedMarkdown = Markdown.ToHtml(fileContent, pipeline);
string markdownHTML = $"{htmlHeader}{parsedMarkdown}{HtmlFooter}";
return markdownHTML;
}
}
}