update travis config to test more ghc versions

.travis.yml

@@ -1,35 +1,42 @@
 ---
 # NB: don't set `language: haskell` here
 # See https://github.com/hvr/multi-ghc-travis for more information
-
-notifications:
-  email:
-    - [email protected]
-  on_success: never
-  on_failure: always
 
 env:
- - GHCVER=7.6.3
- - GHCVER=7.8.2
- - GHCVER=head
+ - CABALVER=1.16 GHCVER=7.6.3
+ - CABALVER=1.18 GHCVER=7.8.4
+ - CABALVER=1.22 GHCVER=7.10.1
+ - CABALVER=head GHCVER=head
 
 matrix:
   allow_failures:
-    - env: GHCVER=head
+    - env: CABALVER=head GHCVER=head
 
 before_install:
- - sudo add-apt-repository -y ppa:hvr/ghc
- - sudo apt-get update
- - sudo apt-get install cabal-install-1.18 ghc-$GHCVER
- - export PATH=/opt/ghc/$GHCVER/bin:$PATH
+ - travis_retry sudo add-apt-repository -y ppa:hvr/ghc
+ - travis_retry sudo apt-get update
+ - travis_retry sudo apt-get install cabal-install-$CABALVER ghc-$GHCVER
+ - export PATH=/opt/ghc/$GHCVER/bin:$HOME/.cabal/bin:/opt/cabal/$CABALVER/bin:$PATH
+ - |
+   if [ $GHCVER = "head" ] || [ ${GHCVER%.*} = "7.8" ] || [ ${GHCVER%.*} = "7.10" ]; then
+     travis_retry sudo apt-get install happy-1.19.4 alex-3.1.3
+     export PATH=/opt/alex/3.1.3/bin:/opt/happy/1.19.4/bin:$PATH
+   else
+     travis_retry sudo apt-get install happy alex
+   fi
 
 install:
- - cabal-1.18 update
- - cabal-1.18 install --only-dependencies --enable-tests
-
+ - cabal --version
+ - echo "$(ghc --version) [$(ghc --print-project-git-commit-id 2> /dev/null || echo '?')]"
+ - travis_retry cabal update
+ - cabal install --only-dependencies --enable-tests --enable-benchmarks
+
 script:
- - cabal-1.18 configure --enable-tests -v2
- - cabal-1.18 build
- - cabal-1.18 test
- - cabal-1.18 check
- - cabal-1.18 sdist
+ - if [ -f configure.ac ]; then autoreconf -i; fi
+ - cabal configure --enable-tests --enable-benchmarks -v2  # -v2 provides useful information for deb    ugging
+ - cabal build   # this builds all libraries and executables (including tests/benchmarks)
+ - cabal test
+ - cabal check
+ - cabal sdist   # tests that a source-distribution can be generated
+ - SRC_TGZ=$(cabal info . | awk '{print $2;exit}').tar.gz &&
+   (cd dist && cabal install --force-reinstalls "$SRC_TGZ")