Proposal: Add concatMapM function (#2042)

[Simon Marlow]

Simon Marlow wrote:
> Bayley, Alistair wrote:
>>> From: libraries-bounces at haskell.org 
>>> [mailto:libraries-bounces at haskell.org] On Behalf Of Ketil Malde
>>>
>>> Somebody raised the question of reading a Content-type field, etc:
>>> would it be possible to "rewind" a handle after setting encoding?  For
>>> Content-type fields, I suspect the header is usually limited to ASCII
>>> anyway, so adding decoding for subsequent text is probably
>>> sufficient.
>>
>>
>> I think this is relevant:
>>  
>> http://www.haskell.org/pipermail/haskell-cafe/2004-September/006801.html
> 
> We've talked a lot in the past about a stream-layering IO abstraction. 
> I'd forgotten about Oleg's post, thanks.
> 
> Here are some others.  There's the prototype I worked on:
> 
> http://www.haskell.org/~simonmar/io/System.IO.html
> 
> There's Bulat's Stream library, which is pretty complete:
> 
> http://haskell.org/haskellwiki/Library/Streams
> 
> And Takano Akio's version, in which he divides the type classes into 
> smaller pieces.  This is closer to the direction I thought we should go:
> 
> http://yogimo.sakura.ne.jp/ssc/

I should also mention John Goerzen's HVIO library:

http://hackage.haskell.org/packages/archive/MissingH/1.0.0/doc/html/System-IO-HVIO.html

Cheers,
	Simon