Span Row Haml Filter

I created a Rails form builder that creates lots o'
two-column  
tabular forms. Occasionally, I need to intersperse textual 

instructions and it comes out looking awful in my Haml. What
I did  
was create a filter called span_row, and I'd like some
comment on it.

Usage:

Assuming you have a tabular_form_for kinda helper (see Rails
Recipes)  
that generates one of these tables, the usage is like so:

- tabular_form_for(person) do |f|
   = render :partial => 'form', :locals => {:f =>
f}
   :span_row
     When you click "signup," you will be taken to
a page where you
     can enter your credit card information. Please follow
the
     instructions there carefully.
   = f.submit "Signup"

The code for the helper is at:

http://pastie.caboo.se/
130587

Issues:

- I couldn't use the Haml::Helpers.open and .puts so
indentation  
doesn't exist. Huh?
- I'd like to use an optional argument to the filter for
columns, but  
don't know exactly how to pass that. Suggestions?

Thanks

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Filters are, at the moment, all evaluated at
precompile-time, rather 
than render-time. This means that there's no way to get a
reference to 
the view object that has helpers defined, nor to take
arguments from the 
template. We plan to add this ability at some point.

s.ross wrote:
> I created a Rails form builder that creates lots o'
two-column  
> tabular forms. Occasionally, I need to intersperse
textual  
> instructions and it comes out looking awful in my Haml.
What I did  
> was create a filter called span_row, and I'd like some
comment on it.
>
> Usage:
>
> Assuming you have a tabular_form_for kinda helper (see
Rails Recipes)  
> that generates one of these tables, the usage is like
so:
>
> - tabular_form_for(person) do |f|
>    = render :partial => 'form', :locals => {:f
=> f}
>    :span_row
>      When you click "signup," you will be
taken to a page where you
>      can enter your credit card information. Please
follow the
>      instructions there carefully.
>    = f.submit "Signup"
>
> The code for the helper is at:
>
> http://pastie.caboo.se/
130587
>
> Issues:
>
> - I couldn't use the Haml::Helpers.open and .puts so
indentation  
> doesn't exist. Huh?
> - I'd like to use an optional argument to the filter
for columns, but  
> don't know exactly how to pass that. Suggestions?
>
> Thanks
>
> >
>
>   


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Filters exist to process text that isn't Haml, and may obey
other rules 
of indentation, etc. It's possible to implement a superset
of the 
functionality of filters using helpers and the :plain filter
(although 
obviously this requires at least the one filter to work),
but that's 
just ugly.

In short, helpers should be used when doing something with
Haml, and 
filters otherwise. Except filters can't dynamically access
anything (nor 
can they take args, to answer your other question). Yet.

- Nathan

s.ross wrote:
> That seems like it would work, and there's every reason
to use it but 
> it begs the question: Why not do pretty much every
filtering thingie 
> this way instead of filters? Conversely, there is the
issue of the 
> implied "do". The code reads like Ruby, but
because it's Haml, you 
> leave off the "do" so it looks invalid
(ecch).
>
> Thoughts?
>
>
> On Dec 19, 2007, at 11:26 AM, Evgeny wrote:
>
>> How about a helpers that accept blocks?
>> Can't they kind of replace filters somehow?
>>
>> Like for example this disfunctional code:
>> http://pastie.caboo.se/
130606
>>
>>
>> - evgeny
>>
>>
>> On Dec 19, 2007 9:10 PM, s.ross <cwdinfogmail.com

>> <mailto:cwdinfogmail.com>> wrote:
>>
>>     How about the optional argument specifying the
number of cols?
>>
>>     Thx
>>
>>     On Dec 19, 2007, at 11:04 AM, Nathan Weizenbaum
wrote:
>>
>>>     Filters are, at the moment, all evaluated
at precompile-time,
>>>     rather 
>>>     than render-time. This means that there's
no way to get a
>>>     reference to 
>>>     the view object that has helpers defined,
nor to take arguments
>>>     from the 
>>>     template. We plan to add this ability at
some point.
>>
>>
>>
>>
>>
>>
>>
>
>
> >


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