forgejo/templates/repo/editor/diff_preview.tmpl

{{$highlightClass := .File.GetHighlightClass}}
<div class="diff-file-box diff-box file-content" id="diff-{{.Index}}">
	<div class="ui attached table segment">
		<div class="file-body file-code code-view code-diff">
			<table>
				<tbody>
					{{range $j, $section := .File.Sections}}
						{{range $k, $line := $section.Lines}}
							<tr class="{{DiffLineTypeToStr .GetType}}-code nl-{{$k}} ol-{{$k}}">
								{{if eq .GetType 4}}
								<td colspan="2" class="lines-num">
									{{/* {{if gt $j 0}}<span class="fold octicon octicon-fold"></span>{{end}} */}}
								</td>
								{{else}}
								<td class="lines-num lines-num-old">
									<span rel="{{if $line.LeftIdx}}diff-{{Sha1 $.File.Name}}L{{$line.LeftIdx}}{{end}}">{{if $line.LeftIdx}}{{$line.LeftIdx}}{{end}}</span>
								</td>
								<td class="lines-num lines-num-new">
									<span rel="{{if $line.RightIdx}}diff-{{Sha1 $.File.Name}}R{{$line.RightIdx}}{{end}}">{{if $line.RightIdx}}{{$line.RightIdx}}{{end}}</span>
								</td>
								{{end}}
								<td class="lines-code">
									<pre><code class="{{if $highlightClass}}language-{{$highlightClass}}{{else}}nohighlight{{end}}">{{$section.GetComputedInlineDiffFor $line}}</code></pre>
								</td>
							</tr>
						{{end}}
					{{end}}
				</tbody>
			</table>
		</div>
	</div>
</div>