Working prototype in hakyll

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-% dirty-haskell.org´s rss feeds
-
-I extended the software suite inherited from [math.kleen.org](http://math.kleen.org) to include support for rss feeds.
-The heart of the issue is a ~80 line haskell script I chose to call, in a bout of creativity, "generate-rss.hs".
-The script uses the [feed](http://hackage.haskell.org/package/feed-0.3.9.2) package.
-
-generate-rss.hs gets passed a title and a list of paths below ./lists to incorporate as items.
-It generates an empty feed structure, adds title and a (hardcoded) base url for RSS metadata, and iterates over the given paths — generating for each path an item to be included in the finished feed.
-This procedure makes use of a state monad (StateT (Feed, Maybe ClockTime) IO ()) to sequentially add items to the feed and keep track of the modification/change time of the newest path examined.
-Each item carries a title, an url, a date, and contents as follows:
-
--  The date used is the modification/change time of the path supplied as a command line argument at the beginning of the program (usually a symbolic link in ./lists) — as such it is the time the post was linked into the particular list we´re generating a RSS feed for (this was not a deliberate design choice but a side effect of the canonical implementation — it was later decided that this behaviour was in fact the one expected all along).
--  The url is generated by following, recursively, the trail of symbolic links starting in ./lists, assuming the final target is indeed in ./posts, and forming the filename of that target into a (hopefully) functional url in a hardcoded fashion.
--  The title is extracted from the markdown file using a function shamelessly copied from extract-title.hs (The author wrote that one too, after all).
--  The contents are read into Pandoc and rendered into [AsciiDoc](http://en.wikipedia.org/wiki/AsciiDoc) format (it seemed convenient at the time).
-
-Along the way two helper functions were introduced — if an implementation of those already exists in Prelude or somewhere else common please mail in a comment:
-
-~~~ {.haskell}
-(<->) :: [(a -> b)] -> a -> [b]
-[] <-> _ = []
-(f:fs) <-> x = (f x:fs <-> x)
-
-(<-->) :: [(a -> a)] -> a -> a
-[] <--> x = x
-(f:fs) <--> x = fs <--> (f x)
-~~~
-
-## Update ##
-
-~~~ {.haskell}
-import Control.Applicative ((<*>), pure)
-
-(<->) fs = (<*>) fs . pure
-
-(<-->) = flip $ foldl (.) id
-~~~
-
-Thanks, viktor.