From 154f68bfd9ab4660dc764dbed6190289082b5c94 Mon Sep 17 00:00:00 2001
From: "Gabriel A. Giovanini" <mail@gabrielgio.me>
Date: Sat, 8 Feb 2025 22:26:39 +0100
Subject: feat: Add syntax highlight to diff

---
 pkg/handler/git/handler.go      | 21 ++++++++++++++++++++-
 templates/gititemcommit.qtpl    |  4 ++--
 templates/gititemcommit.qtpl.go |  4 ++--
 3 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/pkg/handler/git/handler.go b/pkg/handler/git/handler.go
index 9c7ba5b..80f7de6 100644
--- a/pkg/handler/git/handler.go
+++ b/pkg/handler/git/handler.go
@@ -361,12 +361,31 @@ func (g *GitHandler) Commit(w http.ResponseWriter, r *http.Request) error {
 		return err
 	}
 
+	lexer := lexers.Get("diff")
+	style := styles.Get(g.config.GetSyntaxHighlight())
+
+	formatter := html.New(
+		html.WithLineNumbers(true),
+		html.WithLinkableLineNumbers(true, "L"),
+	)
+
+	iterator, err := lexer.Tokenise(nil, diff)
+	if err != nil {
+		return err
+	}
+
+	var code bytes.Buffer
+	err = formatter.Format(&code, style, iterator)
+	if err != nil {
+		return err
+	}
+
 	gitList := &templates.GitItemPage{
 		Name: name,
 		Ref:  ref,
 		GitItemBase: &templates.GitItemCommitPage{
 			Commit: commit,
-			Diff:   diff,
+			Diff:   code.Bytes(),
 		},
 	}
 	templates.WritePageTemplate(w, gitList, r.Context())
diff --git a/templates/gititemcommit.qtpl b/templates/gititemcommit.qtpl
index d223315..ec67757 100644
--- a/templates/gititemcommit.qtpl
+++ b/templates/gititemcommit.qtpl
@@ -3,7 +3,7 @@
 {% code
 type GitItemCommitPage struct {
     Commit *object.Commit
-    Diff string
+    Diff []byte
 }
 %}
 
@@ -14,6 +14,6 @@ type GitItemCommitPage struct {
   {%= Commit(name, g.Commit, true) %}
 </div>
 <div class="code-view">
-<pre>{%s g.Diff %}</pre>
+<pre>{%z= g.Diff %}</pre>
 </div>
 {% endfunc %}
diff --git a/templates/gititemcommit.qtpl.go b/templates/gititemcommit.qtpl.go
index 8048e58..7e458f3 100644
--- a/templates/gititemcommit.qtpl.go
+++ b/templates/gititemcommit.qtpl.go
@@ -23,7 +23,7 @@ var (
 //line templates/gititemcommit.qtpl:4
 type GitItemCommitPage struct {
 	Commit *object.Commit
-	Diff   string
+	Diff   []byte
 }
 
 //line templates/gititemcommit.qtpl:10
@@ -73,7 +73,7 @@ func (g *GitItemCommitPage) StreamGitContent(qw422016 *qt422016.Writer, name, re
 <div class="code-view">
 <pre>`)
 //line templates/gititemcommit.qtpl:17
-	qw422016.E().S(g.Diff)
+	qw422016.N().Z(g.Diff)
 //line templates/gititemcommit.qtpl:17
 	qw422016.N().S(`</pre>
 </div>
-- 
cgit v1.2.3