Skip to content

Latest commit

 

History

History
69 lines (46 loc) · 3.56 KB

content.md

File metadata and controls

69 lines (46 loc) · 3.56 KB

What is Haskell?

Haskell is a lazy, functional, statically-typed programming language with advanced type system features such as higher-rank, higher-kinded parametric polymorphism, monadic effects, generalized algebraic data types (GADTs), flexible type classes, associated type families, and more.

Haskell's ghc is a portable, optimizing compiler with a foreign-function interface (FFI), an LLVM backend, and sophisticated runtime support for concurrency, explicit/implicit parallelism, runtime profiling, etc. Other Haskell tools like criterion, quickcheck, hpc, and haddock provide advanced benchmarking, property-based testing, code coverage, and documentation generation.

A large number of production-quality Haskell libraries are available from Hackage. The cabal tool fetches packages and builds projects using the Hackage ecosystem.

%%LOGO%%

About this image

This image ships a minimal Haskell toolchain with the following packages from the hvr PPA:

  • ghc
  • alex
  • cabal-install
  • happy

The most recent GHC release in the 7.8 series is also available, though no longer receiving updates from upstream, so users are encouraged to upgrade to 7.10.

How to use this image

Start an interactive interpreter session with ghci:

$ docker run -it --rm haskell:7.10
GHCi, version 7.10.1: http://www.haskell.org/ghc/  :? for help
Prelude>

Dockerize a Hackage app with a Dockerfile inheriting from the base image:

FROM haskell:7.8
RUN cabal update && cabal install MazesOfMonad
VOLUME /root/.MazesOfMonad
ENTRYPOINT ["/root/.cabal/bin/mazesofmonad"]

Iteratively develop then ship a Haskell app with a Dockerfile utilizing the build cache:

FROM haskell:7.8

RUN cabal update

# Add .cabal file
ADD ./server/snap-example.cabal /opt/server/snap-example.cabal

# Docker will cache this command as a layer, freeing us up to
# modify source code without re-installing dependencies
RUN cd /opt/server && cabal install --only-dependencies -j4

# Add and Install Application Code
ADD ./server /opt/server
RUN cd /opt/server && cabal install

# Add installed cabal executables to PATH
ENV PATH /root/.cabal/bin:$PATH

# Default Command for Container
WORKDIR /opt/server
CMD ["snap-example"]

Examples

See the application snippet above in more detail in the example snap application.