Update travis.yml to works with stack

.travis.yml

@@ -5,74 +5,35 @@ language: c
 
 sudo: false
 
+# GHC depends on GMP. You can add other dependencies here as well.
+addons:
+  apt:
+    packages:
+    - libgmp-dev
+
 cache:
   directories:
-    - $HOME/.cabsnap
-    - $HOME/.cabal/packages
-
-before_cache:
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/build-reports.log
-  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/00-index.tar
+    - $HOME/.stack
 
 matrix:
   include:
-    - env: CABALVER=1.16 GHCVER=7.6.3
-      compiler: ": #GHC 7.6.3"
-      addons: {apt: {packages: [cabal-install-1.16,ghc-7.6.3], sources: [hvr-ghc]}}
-    - env: CABALVER=1.18 GHCVER=7.8.4
-      compiler: ": #GHC 7.8.4"
-      addons: {apt: {packages: [cabal-install-1.18,ghc-7.8.4], sources: [hvr-ghc]}}
-    - env: CABALVER=1.22 GHCVER=7.10.2
-      compiler: ": #GHC 7.10.2"
-      addons: {apt: {packages: [cabal-install-1.22,ghc-7.10.2],sources: [hvr-ghc]}}
+  - env: ARGS="--resolver lts-2"
+    compiler: ": # lts-2 gch-7.8.4"
+  - env: ARGS="--resolver lts-3"
+    compiler: ": # lts-3 gch-7.10.2"
+  - env: ARGS="--resolver lts"
+    compiler: ": # lts"
 
 before_install:
+# Using compiler above sets CC to an invalid value, so unset it
 - unset CC
-  - export PATH=~/.cabal/bin:/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$PATH
 
-install:
-  - cabal --version
-  - echo "$(ghc --version) [$(ghc --print-project-git-commit-id 2> /dev/null || echo '?')]"
-  - if [ -f $HOME/.cabal/packages/hackage.haskell.org/00-index.tar.gz ];
-    then
-      zcat $HOME/.cabal/packages/hackage.haskell.org/00-index.tar.gz >
-           $HOME/.cabal/packages/hackage.haskell.org/00-index.tar;
-    fi
-  - travis_retry cabal update -v
-  - sed -i 's/^jobs:/-- jobs:/' ${HOME}/.cabal/config
-  - cabal install --only-dependencies --enable-tests --dry -v > installplan.txt
-  - sed -i -e '1,/^Resolving /d' installplan.txt; cat installplan.txt
+# Download and unpack the stack executable
+- mkdir -p ~/.local/bin
+- export PATH=$HOME/.local/bin:$PATH
+- curl -L https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
 
-  # check whether current requested install-plan matches cached package-db snapshot
-  - if diff -u installplan.txt $HOME/.cabsnap/installplan.txt;
-    then
-      echo "cabal build-cache HIT";
-      rm -rfv .ghc;
-      cp -a $HOME/.cabsnap/ghc $HOME/.ghc;
-      cp -a $HOME/.cabsnap/lib $HOME/.cabsnap/share $HOME/.cabsnap/bin $HOME/.cabal/;
-    else
-      echo "cabal build-cache MISS";
-      rm -rf $HOME/.cabsnap;
-      mkdir -p $HOME/.ghc $HOME/.cabal/lib $HOME/.cabal/share $HOME/.cabal/bin;
-      cabal install --only-dependencies --enable-tests;
-    fi
-
-  # snapshot package-db on cache miss
-  - if [ ! -d $HOME/.cabsnap ];
-    then
-       echo "snapshotting package-db to build-cache";
-       mkdir $HOME/.cabsnap;
-       cp -a $HOME/.ghc $HOME/.cabsnap/ghc;
-       cp -a $HOME/.cabal/lib $HOME/.cabal/share $HOME/.cabal/bin installplan.txt $HOME/.cabsnap/;
-    fi
-
-script:
-  - if [ -f configure.ac ]; then autoreconf -i; fi
-  - cabal configure --enable-tests -v2
-  - cabal build
-  - cabal test
-  - cabal check
-  - cabal sdist
-
-  - SRC_TGZ=$(cabal info . | awk '{print $2;exit}').tar.gz &&
-    (cd dist && cabal install --force-reinstalls "$SRC_TGZ")
+# This line does all of the work: installs GHC if necessary, build the library,
+# executables, and test suites, and runs the test suites. --no-terminal works
+# around some quirks in Travis's terminal implementation.
+script: stack $ARGS --no-terminal --install-ghc test --haddock --no-haddock-deps