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darcs hsx patch, add EmbedAsAttr instance for (Attr a (XMLGenT m v))
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Jeremy Shaw  
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 More options May 24 2010, 2:18 pm
From: Jeremy Shaw <jer...@n-heptane.com>
Date: Mon, 24 May 2010 13:18:35 -0500
Local: Mon, May 24 2010 2:18 pm
Subject: darcs hsx patch, add EmbedAsAttr instance for (Attr a (XMLGenT m v))
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Hello,

Sometimes it would be nice to write code like this:

page =
    ...
    <a href=fooURL>foo</a>

  fooURL = XMLGenT m String
  fooURL = return "http://example.org/foo"

Where the attribute value is in the XMLGenT monad. (This is very  
useful when using web-routes).

But, we can't because there is no suitable instance. This patch adds  
an instance,

 > instance (EmbedAsAttr m (Attr a v), TypeCastM m1 m) => EmbedAsAttr  
m (Attr a (XMLGenT m1 v))

(Thanks goes to Sergey Mironov for figuring this out).

- jeremy

  hsx-embedasattr-for-XMLGenT-attr-values.dpath
10K Download

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Thomas Hartman  
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 More options May 24 2010, 3:21 pm
From: Thomas Hartman <thomashartm...@googlemail.com>
Date: Mon, 24 May 2010 12:21:13 -0700
Local: Mon, May 24 2010 3:21 pm
Subject: Re: darcs hsx patch, add EmbedAsAttr instance for (Attr a (XMLGenT m v))
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nice!

>  fooURL = XMLGenT m String

I assume :: was meant instead of =

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Niklas Broberg  
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 More options May 24 2010, 4:07 pm
From: Niklas Broberg <niklas.brob...@gmail.com>
Date: Mon, 24 May 2010 22:07:56 +0200
Local: Mon, May 24 2010 4:07 pm
Subject: Re: darcs hsx patch, add EmbedAsAttr instance for (Attr a (XMLGenT m v))
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> But, we can't because there is no suitable instance. This patch adds an
> instance,

>> instance (EmbedAsAttr m (Attr a v), TypeCastM m1 m) => EmbedAsAttr m (Attr
>> a (XMLGenT m1 v))

I thought this instance was already included, it's a clear oversight
that it isn't. Patch applied, thanks!

Cheers,

/Niklas

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Jeremy Shaw  
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 More options May 24 2010, 4:16 pm
From: Jeremy Shaw <jer...@n-heptane.com>
Date: Mon, 24 May 2010 15:16:58 -0500
Local: Mon, May 24 2010 4:16 pm
Subject: Re: darcs hsx patch, add EmbedAsAttr instance for (Attr a (XMLGenT m v))
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Sweet!

You have a similar feeling instance,

instance (XMLGen m, EmbedAsAttr m a) => EmbedAsAttr m (XMLGenT m a)  
where
  asAttr ma = ma >>= asAttr

But that is not quite the same. But is close enough to perhaps may you  
think you covered this issue :)

- jeremy

On May 24, 2010, at 3:07 PM, Niklas Broberg wrote:

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Niklas Broberg  
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 More options May 24 2010, 4:18 pm
From: Niklas Broberg <niklas.brob...@gmail.com>
Date: Mon, 24 May 2010 22:18:53 +0200
Local: Mon, May 24 2010 4:18 pm
Subject: Re: darcs hsx patch, add EmbedAsAttr instance for (Attr a (XMLGenT m v))
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> You have a similar feeling instance,

> instance (XMLGen m, EmbedAsAttr m a) => EmbedAsAttr m (XMLGenT m a) where
>  asAttr ma = ma >>= asAttr

> But that is not quite the same. But is close enough to perhaps may you think
> you covered this issue :)

I think you're spot on. :)

/Niklas

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