First stab at Travis + cabal-meta.

Travis never works on the first try for me, though :(.

.travis.yml

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+# Travis file initially created at 2015-05-31 using template from
+# <https://github.com/hvr/multi-ghc-travis/commit/c9c87d36c450d7f9cb3183dcaf1f77b60f916f28>
+# and taking the idea of using cabal-meta from yesodweb/yesod.
+
+# NB: don't set `language: haskell` here
+
+# The following enables several GHC versions to be tested; often it's enough to test only against the last release in a major GHC version. Feel free to omit lines listings versions you don't need/want testing for.
+env:
+ #- CABALVER=1.16 GHCVER=6.12.3
+ #- CABALVER=1.16 GHCVER=7.0.1
+ #- CABALVER=1.16 GHCVER=7.0.2
+ #- CABALVER=1.16 GHCVER=7.0.3
+ #- CABALVER=1.16 GHCVER=7.0.4
+ #- CABALVER=1.16 GHCVER=7.2.1
+ #- CABALVER=1.16 GHCVER=7.2.2
+ #- CABALVER=1.16 GHCVER=7.4.1
+ #- CABALVER=1.16 GHCVER=7.4.2
+ #- CABALVER=1.16 GHCVER=7.6.1
+ #- CABALVER=1.16 GHCVER=7.6.2
+ - CABALVER=1.18 GHCVER=7.6.3
+ #- CABALVER=1.18 GHCVER=7.8.1  # see note about Alex/Happy for GHC >= 7.8
+ #- CABALVER=1.18 GHCVER=7.8.2
+ #- CABALVER=1.18 GHCVER=7.8.3
+ - CABALVER=1.18 GHCVER=7.8.4
+ #- CABALVER=1.22 GHCVER=7.10.1
+ - CABALVER=1.22 GHCVER=7.10.2
+ - CABALVER=head GHCVER=head   # see section about GHC HEAD snapshots
+
+# Note: the distinction between `before_install` and `install` is not important.
+before_install:
+ - 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 # see note about happy/alex
+ - export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$HOME/.cabal/bin:$PATH
+
+install:
+ - cabal --version
+ - echo "$(ghc --version) [$(ghc --print-project-git-commit-id 2> /dev/null || echo '?')]"
+ - travis_retry cabal update
+ - cabal install cabal-src cabal-meta
+
+# Here starts the actual work to be performed for the package under test; any command which exits with a non-zero exit code causes the build to fail.
+script:
+ - cabal-meta install --only-dependencies --enable-tests --enable-benchmarks --force-reinstalls
+ - cabal-meta install --run-tests

sources.txt

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+./serversession
+./serversession-backend-acid-state
+./serversession-backend-persistent
+./serversession-backend-redis
+./serversession-frontend-snap
+./serversession-frontend-wai
+./serversession-frontend-yesod
+
+-- <https://github.com/singpolyma/wai-session/pull/7>
+https://github.com/meteficha/wai-session