Re: hat accent bug

[Gavin Smith]

On 2 August 2015 at 22:16, Karl Berry <address@hidden> wrote:
> It could be done somehow, I'm sure.  But I don't want to spend the time
> to do it unless someone has a real document that really needs math in
> section titles.  The bug has been there since @math was created and no
> one has ever complained about it, so I don't think any fix is needed.
> Seems like it would be more fruitful to spend time on improving the math
> support in general, e.g., to really support the commands, or to support
> displayed equations, or whatever.

It's not just in @math that @-commands have to be recognized by
makeinfo. It's also in @tex. Backslash can be used instead for
commands makeinfo doesn't know about, so I don't see any need for
change. Only that catcode changes are tricky TeX, as I've been
discovering and as you've long known; so using @ throughout for
catcode 0 seems nicer.

The following had good results for the testing I did. There's no
immediate need for anything like this but maybe it's an idea to bear
in mind if ever there are problems.

Index: Texinfo/Parser.pm
===================================================================
--- Texinfo/Parser.pm   (revision 6455)
+++ Texinfo/Parser.pm   (working copy)
@@ -5052,8 +5052,14 @@ sub _parse_texi($;$)
             last;
           }
         } else {
-          $self->line_error(sprintf($self->__("unknown command `%s'"),
-                                      $command), $line_nr);
+          if ($self->{'context_stack'}->[-1] ne 'math'
+              and $self->{'context_stack'}->[-1] ne 'raw'
+              and $self->{'context_stack'}->[-1] ne 'rawpreformatted') {
+            $self->line_error(sprintf($self->__("unknown command `%s'"),
+                                        $command), $line_nr);
+          } else {
+            $current = _merge_text($self, $current, '@'.$command);
+          }
         }