[Catalyst] Re: How to access current MyApp instance ?

[Bill Moseley]

On Sun, Jul 01, 2007 at 09:27:17PM +0200, A. Pagaltzis wrote:
> * Bill Moseley <moseley at hank.org> [2007-07-01 19:25]:
> > Macro?
> > 
> >     [%
> >         game_detail_link( Game, 'Click here' );
> >         game_history_link( Game, 'View history' );
> >     %]
> 
> Avoid macros like the plague.
> 
> ??? They share a namespace with variables.

Yes, right.  References to subroutines are variables.

> ??? TT2 only has global variables with dynamic scoping.

Yes, you just have a stash, eh, hash.  And shallow localization.
I kind of wish macros didn't bother with localization.

> ??? It???s extremely lenient at runtime; you can use function call
>   syntax to ???invoke??? a variable, with no complaints.

Yes, that's the design.  Or a byproduct of the design.  You can invoke
variable syntax to invoke subroutine calls, too.  [% foo %] just spits
out whatever foo is, and I don't worry about the implementation.  Is
that good or bad?  Either way, sure is handy.

> Taken together, these mean that you can have hours of fun chasing
> down stupid bugs.

Yes, when first using TT you can do that.  It's not that bad with a
little experience.  You can catch undefined errors automatically if
you want but TT ignoring them also works out to be a feature.  TT
generates perl code, and when I have a tough problem I just debug that
code.

> Of course, we???ve known since the ???70s or so how to make better
> programming languages, but ABW considers templating languages
> to be totally different from programming languages, so you get
> to be transported back to the ???60s.

Yes, we are celebrating 40 years this summer!  Only when I'm really
tripping do I believe TT's a programming language.


> Have I mentioned that I hate TT2 with a passion?

Avoid it like the plague, then. ;)

-- 
Bill Moseley
moseley at hank.org