blazeT: A true monad (transformer) version of the blaze-markup and blaze-html libraries

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A true monad (transformer) version of the blaze-markup and blaze-html libraries, implemented as as a very thin wrapper around and strict superset of these libraries.

See Readme on Github.

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Versions 0.0.1, 0.0.2, 0.0.3, 0.0.4, 0.0.5, 0.0.5
Change log None available
Dependencies base (>= && <5), blaze-builder (>=0.2), blaze-html (>=, blaze-markup (>=, bytestring, mtl, text, transformers [details]
License MIT
Author Johannes Gerer
Maintainer Johannes Gerer <>
Category Text, Data, Web
Home page
Bug tracker
Source repo head: git clone
Uploaded by johannesgerer at 2016-10-26T00:06:00Z




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Readme for blazeT-0.0.5

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blazeT Build Status

A true monad (transformer) version of the blaze-markup and blaze-html libraries.


While blaze's Markup and Html types have Monad instances and are able to use the concise do notation.


Backwards compatible

The library is intended to serve as a drop-in replacement for the blaze-markup and blaze-html libraries and should be backwards compatible:

Simply replace your module Text.Blaze.* imports with module Text.BlazeT.* and it should give the same results.

For usage of blaze check out their documentation.

Unleash the monads

Implementation Details (from Text.BlazeT.Internals)

Everything build around the simple newtype definition of the MarkupT transformer, which is basically a WriterT transformer writing Blaze.Markup:

newtype MarkupT m a= MarkupT { fromMarkupT :: WriterT B.Markup m a }

Wrappers used to lift all Blaze entities into BlazeT are trivially expressible using basic WriterT class methods:

-- | Wrapping `Blaze.Markup` is simply `WriterT.tell`
wrapMarkupT :: Monad m => B.Markup -> MarkupT m ()
wrapMarkupT = tell

-- | Wrapping functions that modify `Blaze.Markup` is simply  `WriterT.censor`
wrapMarkupT2 ::  Monad m => (B.Markup -> B.Markup)
                 -> MarkupT m a -> MarkupT m a
wrapMarkupT2 = censor