From 77a1cfb9a4c7e62e5c5bcf81fe2c74090caea37a Mon Sep 17 00:00:00 2001
From: Ihor Radchenko <yantar92@posteo.net>
Date: Mon, 16 Jan 2023 13:04:01 +0300
Subject: [PATCH] org-html-src-block: Treat code blocks without LANG equally
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* lisp/ox-html.el (org-html-src-block): Do not treat src blocks
without LANG as example blocks.  Instead, export them using "nil"
language.  This way, such src blocks will get captions, unlike example
blocks.

The new behavior is consistent with ox-latex and ox-ascii.

Reported-by: Johan Bolmsjö <org-mode@johan.bitmaster.se>
Link: https://orgmode.org/list/87zgb90win.fsf@localhost
---
 lisp/ox-html.el | 52 ++++++++++++++++++++++++-------------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

diff --git a/lisp/ox-html.el b/lisp/ox-html.el
index 7b79c57d4..5e58ccba3 100644
--- a/lisp/ox-html.el
+++ b/lisp/ox-html.el
@@ -3616,32 +3616,32 @@ contextual information."
 	   (klipsify  (and  (plist-get info :html-klipsify-src)
                             (member lang '("javascript" "js"
 					   "ruby" "scheme" "clojure" "php" "html")))))
-      (if (not lang) (format "<pre class=\"example\"%s>\n%s</pre>" label code)
-	(format "<div class=\"org-src-container\">\n%s%s\n</div>"
-		;; Build caption.
-		(let ((caption (org-export-get-caption src-block)))
-		  (if (not caption) ""
-		    (let ((listing-number
-			   (format
-			    "<span class=\"listing-number\">%s </span>"
-			    (format
-			     (org-html--translate "Listing %d:" info)
-			     (org-export-get-ordinal
-			      src-block info nil #'org-html--has-caption-p)))))
-		      (format "<label class=\"org-src-name\">%s%s</label>"
-			      listing-number
-			      (org-trim (org-export-data caption info))))))
-		;; Contents.
-		(if klipsify
-		    (format "<pre><code class=\"src src-%s\"%s%s>%s</code></pre>"
-			    lang
-			    label
-			    (if (string= lang "html")
-				" data-editor-type=\"html\""
-			      "")
-			    code)
-		  (format "<pre class=\"src src-%s\"%s>%s</pre>"
-                          lang label code)))))))
+      (format "<div class=\"org-src-container\">\n%s%s\n</div>"
+	      ;; Build caption.
+	      (let ((caption (org-export-get-caption src-block)))
+		(if (not caption) ""
+		  (let ((listing-number
+			 (format
+			  "<span class=\"listing-number\">%s </span>"
+			  (format
+			   (org-html--translate "Listing %d:" info)
+			   (org-export-get-ordinal
+			    src-block info nil #'org-html--has-caption-p)))))
+		    (format "<label class=\"org-src-name\">%s%s</label>"
+			    listing-number
+			    (org-trim (org-export-data caption info))))))
+	      ;; Contents.
+	      (if klipsify
+		  (format "<pre><code class=\"src src-%s\"%s%s>%s</code></pre>"
+			  lang ; lang being nil is OK.
+			  label
+			  (if (string= lang "html")
+			      " data-editor-type=\"html\""
+			    "")
+			  code)
+		(format "<pre class=\"src src-%s\"%s>%s</pre>"
+                        ;; Lang being nil is OK.
+                        lang label code))))))
 
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