From ccc93a0562d36788cef3df0d9796d670486ca722 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Paul=20H=C3=A4nsch?= <paul@plutz.net>
Date: Thu, 29 Aug 2024 13:22:57 +0200
Subject: [PATCH] minor fix: in fenced divs and fenced code blocks, omit empty
 class attribute

---
 markdown.awk | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/markdown.awk b/markdown.awk
index d54d125..7e20ebb 100755
--- a/markdown.awk
+++ b/markdown.awk
@@ -557,10 +557,14 @@ function _block( block, LOCAL, st, len, text, title, attrib, href, guard, code,
     attrib = gensub(/^:::+[ \t]*\{?[ \t]*([^\}\n]*)\}?[ \t]*\n.*$/, "\\1", 1, block);
     gsub(/[^a-zA-Z0-9_-]+/, " ", attrib);
     gsub(/(^ | $)/, "", attrib);
-    if ( match(code, "(^|\n)" guard "+(\n|$)" ) ) {
+    if ( match(code, "(^|\n)" guard "+(\n|$)" ) && attrib ) {
       len = RLENGTH; st = RSTART;
       return "<div class=\"" attrib "\">" _nblock( substr(code, 1, st - 1) ) "</div>\n" \
              _block( substr( code, st + len ) );
+    } else if ( match(code, "(^|\n)" guard "+(\n|$)" ) ) {
+      len = RLENGTH; st = RSTART;
+      return "<div>" _nblock( substr(code, 1, st - 1) ) "</div>\n" \
+             _block( substr( code, st + len ) );
     } else {
       match( block, /(^|\n)[[:space:]]*(\n|$)/ ) || match( block, /$/ );
       len = RLENGTH; st = RSTART;
@@ -575,10 +579,14 @@ function _block( block, LOCAL, st, len, text, title, attrib, href, guard, code,
     attrib = gensub(/^(~~~+|```+)[ \t]*\{?[ \t]*([^\}\n]*)\}?[ \t]*\n.*$/, "\\2", 1, block);
     gsub(/[^a-zA-Z0-9_-]+/, " ", attrib);
     gsub(/(^ | $)/, "", attrib);
-    if ( match(code, "(^|\n)" guard "+(\n|$)" ) ) {
+    if ( match(code, "(^|\n)" guard "+(\n|$)" ) && attrib ) {
       len = RLENGTH; st = RSTART;
       return "<pre><code class=\"" attrib "\">" HTML( substr(code, 1, st - 1) ) "</code></pre>\n" \
              _block( substr( code, st + len ) );
+    } else if ( match(code, "(^|\n)" guard "+(\n|$)" ) ) {
+      len = RLENGTH; st = RSTART;
+      return "<pre><code>" HTML( substr(code, 1, st - 1) ) "</code></pre>\n" \
+             _block( substr( code, st + len ) );
     } else {
       match( block, /(^|\n)[[:space:]]*(\n|$)/ ) || match( block, /$/ );
       len = RLENGTH; st = RSTART;
-- 
2.39.2