The ‘th-utilities’ package provides a number of useful utilities for
Template Haskell.
In particular:
TH.Derive
provides a convenient system for using TH to derive typeclass instances. It
allows for open registration of TH derivers, and reuses instance syntax for
invoking them.
TH.ReifyDataType
provides utilities for reifying simplified datatype info. It omits details
that you don’t usually want to handle, making it much more straightforward to
generate code based on datatype structure.
TH.RelativePaths
provides utilities for loading files based on paths relative to the cabal
file. This is particularly handy for loading code into ghci even when its
current dir isn’t the package dir. Ideally, this module would be used by
everyone who currently uses qAddDependentFile.
TH.Utilities
provides a miscellaneous set of utilities that are useful within this package
and elsewhere.
Changes
ChangeLog
0.2.5.2
Fixes build with ghc-9.0 (template-haskell-2.17)
0.2.5.1
typeRepToType now supports type literals, tuples and lists. See
#18
0.2.5.0
Adds tupT and promotedTupT.
Adds TH.FixQ.fixQ, a compatibility shim to provide fixQ for
template-haskell <= 2.17 (ghc <= 9.0.1).
0.2.4.3
Adds a lower bound for th-abstraction dependency. Also released as
a hackage revision of 0.2.4.2. See #15
Fixes generated Storable instances to have a sizeOf definition
which works with -XStrict. See #13
0.2.4.0
Compatibility with GHC-8.10
Behavior change in reification of type family instances. Instead of
erroring if the instance mentions a kind variable, now just ignores
it.
0.2.3.1
Compatibility with GHC-8.8
0.2.3.0
Improved fix to the type variable behavior with GHC <= 7.10. Uses
Any in place of type variables instead of (), to allow for more
kinds than just * and Constraint.
0.2.2.0
Fixes derive and instantiator mechanisms to work with ghc 7.10 and
earlier. Previously, invocation was broken when type variables were
used.
Fixes freeVarsT - it now looks through more constructors of Type.
Adds dequalifyTyVars to dequalify every type variable.
0.2.0.1
Fixes build on 7.8
Fixes warnings
0.2.0.0
Adds TH.ReifySimple, which supports reifying most of the information TH users
care about.
Adds some utilities based on SYB, which is often useful for TH.
