wikiheaders.pl: Don't treat chars in `code` blocks as markdown.

Otherwise a formula like `x = y * 2;` would treat that '*' as the start of
an italicized section when converting to MediaWiki format, and match any
other '*' in the content as the end marker.

build-scripts/wikiheaders.pl

@@ -136,14 +136,21 @@ sub wikify_chunk {
     #print("\n\nWIKIFY CHUNK:\n\n$str\n\n\n");
 
     if ($wikitype eq 'mediawiki') {
+        # convert `code` things first, so they aren't mistaken for other markdown items.
+        my $codedstr = '';
+        while ($str =~ s/\A(.*?)\`(.*?)\`//ms) {
+            my $codeblock = $2;
+            $codedstr .= wikify_chunk($wikitype, $1, undef, undef);
+            # Convert obvious SDL things to wikilinks, even inside `code` blocks.
+            $codeblock =~ s/\b(SDL_[a-zA-Z0-9_]+)/[[$1]]/gms;
+            $codedstr .= "<code>$codeblock</code>";
+        }
+
         # Convert obvious SDL things to wikilinks.
         $str =~ s/\b(SDL_[a-zA-Z0-9_]+)/[[$1]]/gms;
 
         # Make some Markdown things into MediaWiki...
 
-        # <code></code> is also popular.  :/
-        $str =~ s/\`(.*?)\`/<code>$1<\/code>/gms;
-
         # bold+italic
         $str =~ s/\*\*\*(.*?)\*\*\*/'''''$1'''''/gms;
 
@@ -156,6 +163,8 @@ sub wikify_chunk {
         # bullets
         $str =~ s/^\- /* /gm;
 
+        $str = $codedstr . $str;
+
         if (defined $code) {
             $str .= "<syntaxhighlight lang='$codelang'>$code<\/syntaxhighlight>";
         }