[v7.0/forgejo] Render inline file permalinks

Backport: https://codeberg.org/forgejo/forgejo/pulls/2669

(cherry picked from commit 1d3240887c)
(cherry picked from commit 781a37fbe1)
(cherry picked from commit 8309f008c2)
(cherry picked from commit fae8d9f70d)
(cherry picked from commit 6721cba75b)
(cherry picked from commit 562e5cdf32)
(cherry picked from commit d789d33229)
(cherry picked from commit 8218e80bfc)
(cherry picked from commit 10bca456a9)
(cherry picked from commit db6f6281fc)
(cherry picked from commit ed8e8a792e)
(cherry picked from commit d6428f92ce)
(cherry picked from commit 069d87b80f)
(cherry picked from commit 2b6546adc9)
(cherry picked from commit 4c7cb0a5d2)
(cherry picked from commit 7e0014dd13)
(cherry picked from commit 16a8658878)
(cherry picked from commit 6e98bacbbd)

modules/markup/html.go

@@ -171,6 +171,7 @@ type processor func(ctx *RenderContext, node *html.Node)
 var defaultProcessors = []processor{
 	fullIssuePatternProcessor,
 	comparePatternProcessor,
+	filePreviewPatternProcessor,
 	fullHashPatternProcessor,
 	shortLinkProcessor,
 	linkProcessor,
@@ -1054,6 +1055,47 @@ func comparePatternProcessor(ctx *RenderContext, node *html.Node) {
 	}
 }
 
+func filePreviewPatternProcessor(ctx *RenderContext, node *html.Node) {
+	if ctx.Metas == nil {
+		return
+	}
+	if DefaultProcessorHelper.GetRepoFileBlob == nil {
+		return
+	}
+
+	next := node.NextSibling
+	for node != nil && node != next {
+		locale, ok := ctx.Ctx.Value(translation.ContextKey).(translation.Locale)
+		if !ok {
+			locale = translation.NewLocale("en-US")
+		}
+
+		preview := NewFilePreview(ctx, node, locale)
+		if preview == nil {
+			return
+		}
+
+		previewNode := preview.CreateHTML(locale)
+
+		// Specialized version of replaceContent, so the parent paragraph element is not destroyed from our div
+		before := node.Data[:preview.start]
+		after := node.Data[preview.end:]
+		node.Data = before
+		nextSibling := node.NextSibling
+		node.Parent.InsertBefore(&html.Node{
+			Type: html.RawNode,
+			Data: "</p>",
+		}, nextSibling)
+		node.Parent.InsertBefore(previewNode, nextSibling)
+		node.Parent.InsertBefore(&html.Node{
+			Type: html.RawNode,
+			Data: "<p>" + after,
+		}, nextSibling)
+
+		node = node.NextSibling
+	}
+}
+
 // emojiShortCodeProcessor for rendering text like :smile: into emoji
 func emojiShortCodeProcessor(ctx *RenderContext, node *html.Node) {
 	start := 0