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type-level-numbers
Implementation of type level natural and signed integer numbers in haskell using type families.
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README
Units of measure as a GHC typechecker plugin
The uom-plugin library adds support for units of measure to GHC using the new experimental facility for typechecker plugins, which is available in GHC 7.10 and later. See Data.UnitsOfMeasure.Tutorial for an introduction to the library, and the accompanying paper for more background. An example of a package that uses the library is given in [uom-plugin-examples](uom-plugin-examples).
The library has been tested with GHC 7.10.3, 8.0.2 & 8.2.2.
:warning: Please don't use this plugin with later versions of GHC as it will likely fail to solve constraints, #43.
Installation
Grab the source.
> git clone https://github.com/adamgundry/uom-plugin.git
> cd uom-plugin
Then build and run with any of these methods:
- ### With Cabal new-build
> cabal new-build all
> cabal new-exec Examples
- ### With Nix and Cabal
The default compiler is set in ./nix/config.nix as compiler ? "ghc822";
> nix-shell
[nix-shell:]$ cabal new-build all
Resolving dependencies...
Up to date
With GHC > 8.2.2 only the plugin itself builds, not its tests or the
examples. There are conditionals for this in the package.dhall files;
# package.dhall
when = { condition = "impl(ghc > 8.2.2)", buildable = False }
# .cabal
if impl(ghc > 8.2.2)
buildable: False
If the conditions were not in place then what they do is equivalent to;
> nix-shell -p haskell.compiler.ghc822 -p haskell.packages.ghc822.cabal-install
[nix-shell:]$ cabal new-build uom-plugin --disable-tests
Resolving dependencies...
Build profile: -w ghc-8.2.2 -O1
...
- ### Within a Cabal Sandbox
> cabal sandbox init
(cd uom-plugin && cabal sandbox init --sandbox=../.cabal-sandbox && cabal install)
> cd uom-plugin-examples/
uom-plugin-examples> cabal sandbox init --sandbox=../.cabal-sandbox
uom-plugin-examples> cabal build
uom-plugin-examples> dist/build/Examples/Examples
- ### With Stack
From the set of ./stack/stack-<ghc-version>.yaml provided files, picking the
one that corresponds to ghc-8.2.2;
> stack build --stack-yaml=./stack/stack-8.2.2.yaml
> stack exec Examples --stack-yaml=./stack/stack-8.2.2.yaml
Continuous Integration
If installing tooling from the master branch of haskell-ci then generate the
.travis.yml setup with;
> make-travis-yml --output=.travis.yml --config=cabal.haskell-ci cabal.project
If installing tooling from the package branch of haskell-ci then generate the
.travis.yml setup with;
> haskell-ci --output=.travis.yml --config=cabal.haskell-ci cabal.project