markup: Reimplement pygmentsCodefencesGuessSyntax

Fixes #6565

2 files changed, 22 insertions, 0 deletions

diff --git a/markup/goldmark/convert.go b/markup/goldmark/convert.go
index 167286831..15b0f0d77 100644
--- a/markup/goldmark/convert.go
+++ b/markup/goldmark/convert.go
@@ -198,6 +198,7 @@ func newHighlighting(cfg highlight.Config) goldmark.Extender {
 
 	e := hl.NewHighlighting(
 		hl.WithStyle(cfg.Style),
+		hl.WithGuessLanguage(cfg.GuessSyntax),
 		hl.WithCodeBlockOptions(highlight.GetCodeBlockOptions()),
 		hl.WithFormatOptions(
 			cfg.ToHTMLOptions()...,
diff --git a/markup/goldmark/convert_test.go b/markup/goldmark/convert_test.go
index a23976fd6..b6816d2e5 100644
--- a/markup/goldmark/convert_test.go
+++ b/markup/goldmark/convert_test.go
@@ -224,4 +224,25 @@ LINE5
 		result = convertForConfig(c, cfg, lines, "bash {linenos=table}")
 		c.Assert(result, qt.Contains, "<span class=\"lnt\">1\n</span>")
 	})
+
+	c.Run("No language", func(c *qt.C) {
+		cfg := highlight.DefaultConfig
+		cfg.NoClasses = false
+		cfg.LineNos = true
+		cfg.LineNumbersInTable = false
+
+		result := convertForConfig(c, cfg, lines, "")
+		c.Assert(result, qt.Contains, "<pre><code>LINE1\n")
+	})
+
+	c.Run("No language, guess syntax", func(c *qt.C) {
+		cfg := highlight.DefaultConfig
+		cfg.NoClasses = false
+		cfg.GuessSyntax = true
+		cfg.LineNos = true
+		cfg.LineNumbersInTable = false
+
+		result := convertForConfig(c, cfg, lines, "")
+		c.Assert(result, qt.Contains, "<span class=\"ln\">2</span>LINE2\n<")
+	})
 }