[Haskell-cafe] Retrieving Haddock comments with haskell-src-exts

[AntC]

> Niklas Broberg <niklas.broberg <at> gmail.com> writes:
> 
> Hmm. I see the difficulty here, ...

> 
> On Wed, Aug 14, 2013 at 8:57 PM, Mateusz Kowalczyk wrote:
> ...
> The main problem with this approach is that we get comments (and their
> SrcLoc) as a separate list.

Hi Niklas, Mateusz,

It seems that haskell-src-exts has done quite a lot of the hard work 
(impressive!). 

Function parseFileWithComments returns the AST annotated with SrcLoc for 
each major node, and with a separate list of comments annotated with 
SrcSpan. So it should be possible to reconstitute the source and 
intersperse the comments between the nodes(?) -- or detect where a comment 
spans code.

(I'm also looking at the discussion about comments on Niklas's 
announcement of 1.14.0 )

Could there be a style of prettyPrint that carries the list of comments 
(as a continuation) alongside walking the AST, and consumes/outputs each 
comment where the comment's Span falls between the nodes' Loc? Would this 
need too much lookahead?

(And thank you to Adam for introducing me to the joys of source-munging. 
http://www.haskell.org/pipermail/haskell-cafe/2013-August/108426.html .)

AntC