feat: new default style and more

awk/fenced_code.awk

@@ -1,11 +1,20 @@
-BEGIN { in_fence = 0; first_line = 0 }
+BEGIN { in_fence = 0; first_line = 0; code_tag = "<code>" }
 {
     if (!in_fence && $0 ~ /^```/) {
         in_fence = 1
         first_line = 1
+        lang = $0
+        sub(/^```[[:space:]]*/, "", lang)
+        sub(/[[:space:]]*$/, "", lang)
+        if (lang != "") {
+            code_tag = "<code class=\"language-" lang "\">"
+        } else {
+            code_tag = "<code>"
+        }
         next
     }
     if (in_fence && $0 ~ /^```[[:space:]]*$/) {
+        if (first_line) printf "%s", "<pre>" code_tag
         print "</code></pre>"
         in_fence = 0
         next
@@ -14,8 +23,12 @@ BEGIN { in_fence = 0; first_line = 0 }
         gsub(/&/, "\\&amp;"); gsub(/</, "\\&lt;"); gsub(/>/, "\\&gt;")
         if (first_line) {
             first_line = 0
-            if ($0 == "") next
-            print "<pre><code>" $0
+            printf "%s", "<pre>" code_tag
+            if ($0 == "") {
+                print ""
+                next
+            }
+            print $0
         } else {
             print
         }
@@ -24,5 +37,8 @@ BEGIN { in_fence = 0; first_line = 0 }
     }
 }
 END {
-    if (in_fence) print "</code></pre>"
+    if (in_fence) {
+        if (first_line) printf "%s", "<pre>" code_tag
+        print "</code></pre>"
+    }
 }