Shakespeare is a family of type-safe, efficient template languages. Shakespeare templates are expanded at compile-time, ensuring that all interpolated variables are in scope. Variables are interpolated according to their type through a typeclass.
Shakespeare templates can be used inline with a quasi-quoter or in an external file.
Note there is no dependency on haskell-src-extras. Instead Shakespeare believes logic should stay out of templates and has its own minimal Haskell parser.
Use can use parantheses when referencing variables. This allows you to have
functions applied to multiple arguments.
Added the hamlet’ and xhamlet’ quasiquoters for generating plain Html
values.
Added runtime Hamlet support.
Added “file debug” support. This is a mode that is a drop-in replacement for
external files compiled via template haskell. However, this mode also has a
runtime component, in that is reads your templates at runtime, thus avoiding
the need to a recompile for each template change. This takes a runtime hit
obviously, so it’s recommended that you switch back to the compile-time
templates for production systems.
Added the Cassius and Julius template languages for CSS and Javascript,
respectively. The former is white-space sensitive, whereas the latter is just
a passthrough for raw Javascript code. The big feature in both of them is that
they support variable interpolation just like Hamlet does.
New in Hamlet 0.4.0
Internal template parsing is now done via Parsec. This opened the doors for
the other changes mentioned below, but also hopefully gives more meaningful
error messages. There’s absolutely no runtime performance hit for this change,
since all parsing is done at compile time, and if there is any compile-time
hit, it’s too negligible to be noticed.
Attribute values can now be quoted. This allows you to embed spaces, periods
and pounds in an attribute value. For example:
[$hamlet|%input!type=submit!value=“Add new value”|].
Space-delimited references in addition to period-delimited ones. This only
applies to references in content, not in statements. For example, you could
write [$hamlet|$foo bar baz$|].
Dollar-sign interpolation is now polymorphic, based on the ToHtml typeclass.
You can now do away with $string.var$ and simply type $var$. Currently, the
ToHtml typeclass is not exposed, and it only provides instances for String and
Html, though this is open for discussion.
Added hamletFile and xhamletFile which loads a Hamlet template from an
external file. The file is parsed at compile time, just like a quasi-quoted
template, and must be UTF-8 encoded. Additionally, be warned that the compiler
won’t automatically know to recompile a module if the template file gets
changed.