Little refactoring of diff highlight.

Moving cache variable to template instead of in the struct.

models/git_diff.go

 	IsBin              bool
 	IsRenamed          bool
 	Sections           []*DiffSection
-	HighlightClass     string
 }
 
 func (diffFile *DiffFile) GetType() int {
 }
 
 func (diffFile *DiffFile) GetHighlightClass() string {
-	if diffFile.HighlightClass == "" {
-		diffFile.HighlightClass = highlight.FileNameToHighlightClass(diffFile.Name)
-	}
-	return diffFile.HighlightClass
+	return highlight.FileNameToHighlightClass(diffFile.Name)
 }
 
 type Diff struct {

templates/repo/diff_box.tmpl

 	</div>
 
 	{{range $i, $file := .Diff.Files}}
+		{{$highlightClass := $file.GetHighlightClass}}
 		<div class="diff-file-box diff-box file-content" id="diff-{{.Index}}">
 			<h4 class="ui top attached normal header">
 				<div class="diff-counter count ui left">
 														<span rel="{{if $line.LeftIdx}}diff-{{Sha1 $file.Name}}L{{$line.LeftIdx}}{{end}}">{{if $line.LeftIdx}}{{$line.LeftIdx}}{{end}}</span>
 													</td>
 													<td class="lines-code halfwidth">
-														<pre><code class="wrap {{if $file.GetHighlightClass}}language-{{$file.GetHighlightClass}}{{else}}nohighlight{{end}}">{{if $line.LeftIdx}}{{$section.GetComputedInlineDiffFor $line}}{{end}}</code></pre>
+														<pre><code class="wrap {{if $highlightClass}}language-{{$highlightClass}}{{else}}nohighlight{{end}}">{{if $line.LeftIdx}}{{$section.GetComputedInlineDiffFor $line}}{{end}}</code></pre>
 													</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>
 													<td class="lines-code halfwidth">
-														<pre><code class="wrap {{if $file.GetHighlightClass}}language-{{$file.GetHighlightClass}}{{else}}nohighlight{{end}}">{{if $line.RightIdx}}{{$section.GetComputedInlineDiffFor $line}}{{end}}</code></pre>
+														<pre><code class="wrap {{if $highlightClass}}language-{{$highlightClass}}{{else}}nohighlight{{end}}">{{if $line.RightIdx}}{{$section.GetComputedInlineDiffFor $line}}{{end}}</code></pre>
 													</td>
 												</tr>
 											{{end}}
 													</td>
 													{{end}}
 													<td class="lines-code">
-														<pre><code class="{{if $file.GetHighlightClass}}language-{{$file.GetHighlightClass}}{{else}}nohighlight{{end}}">{{$section.GetComputedInlineDiffFor $line}}</code></pre>
+														<pre><code class="{{if $highlightClass}}language-{{$highlightClass}}{{else}}nohighlight{{end}}">{{$section.GetComputedInlineDiffFor $line}}</code></pre>
 													</td>
 												</tr>
 											{{end}}