export more Html functions and use StateT monad transformer instead of S...

[freiric]

...tate in order to implement Toc extending to subpage in gitit2: jgm/gitit2/issues/11 Additional exported functions: defaultWriterState, WriterState, inlineListToHtml, unordList

[hazelybell]

I need this too (because I'm using @freiric 's code where he needed this.)

[tarleb]

I don't have an opinion on whether this makes sense in general, so I'll just add some technical comments:

• Every function that's exported from a module should have a doc string.
• Monad m implies Functor m, it is sufficient to just specify the former in type definitions.
• Commits should be atomic and have a descriptive and short (≤ 50 chars) commit message. A good split could be to have a commit for the StateT type change and one for the additional module exports.

I'm also wondering if this generalization would have a performance impact, although I guess that it doesn't (since type State s = StateT s Identity).

[freiric]

Thanks for your comments, they are very welcome. I added the doc string, and splitted the commit as you advised. I did not remove the Functor from the type definition, because I was not sure whether it is safe with GHC prior to 7.10.