IHaskell/.travis.yml

# Test against different stack LTS versions.
env:
 - DISPLAY=true   RESOLVER=lts-8.3 # GHC 8.0.2

# Choose a lightweight base image; we provide our own build tools.
language: python

# Enable caching.
sudo: false

# Caching so the next build will be fast too.
# These caches are the same between resolvers, but this is fine, 
# as Stack differentiates between its resolvers.
cache:
  directories:
  - $HOME/.ghc
  - $HOME/.cabal
  - $HOME/.stack
  - $HOME/zeromq

# Enable packages we need.
# Not all packages are available – see before_install for from-source builds. 
addons:
  apt:
    packages:
      - libmagic-dev     # magic
      - libgmp-dev       # ghc
      - libblas-dev      # hmatrix
      - liblapack-dev    # hmatrix

before_install:
    # Download and unpack the stack executable
  - export PATH=$HOME/.local/bin:$PATH
  - mkdir -p ~/.local/bin
  - curl -L https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'

    # Install zeromq3 -- the package is not supported yet on Travis whitelist... (06/06/2016)
  - |
    if [ ! -d "$HOME/zeromq/lib" ]; then
        export OLDPWD=$(pwd) 
        travis_retry git clone http://www.github.com/zeromq/zeromq4-x.git libzmq
        mkdir $HOME/zeromq
        cd libzmq
        travis_retry ./autogen.sh
        travis_retry ./configure --prefix=$HOME/zeromq
        make
        travis_retry make install
        cd $OLDPWD
    fi

    # Upgrades to avoid later build problems
  - pip install -U pip
  - pip install -U setuptools

    # Install nbconvert for testing the notebook
  - pip install jupyter notebook nbconvert

# This step takes the longest, and is what generates the Stack cache. 
install:
  # Set path for pkg-config to find zeromq, otherwise install of zeromq4-haskell fails.
  - export PKG_CONFIG_PATH=$HOME/zeromq/lib/pkgconfig/
  - |
    echo "apply-ghc-options: everything" >> stack.yaml

  - stack setup --resolver=$RESOLVER
  - stack install gtk2hs-buildtools --fast
  - stack build hmatrix --resolver=$RESOLVER --fast
  - stack build --dependencies-only --resolver=$RESOLVER --fast

script:
  - export LD_LIBRARY_PATH=$HOME/zeromq/lib
  - stack test --resolver=$RESOLVER --fast
  - |
    set -e
    if $DISPLAY; then
        TOP=$(pwd)
        stack build --resolver=$RESOLVER --fast

        # Ensure that ipython-kernel examples build successfully.
        stack build ipython-kernel --flag ipython-kernel:examples --fast

        # Ensure that IHaskell notebook remains unchanged.
        # Run the notebook to regenerate the outputs, then compare the new notebook to the old one.
        stack install
        stack exec -- ihaskell install --stack
        stack exec -- jupyter nbconvert --to=notebook --execute --stdout notebooks/IHaskell.ipynb > ~/ihaskell-out.ipynb

        # Images are rendered differently on different systems, so filter them out in the comparison
        diff <(grep -v image/png ~/ihaskell-out.ipynb) <(grep -v image/png notebooks/IHaskell.ipynb)
    fi