Update Travis

.travis.yml

 # This Travis job script has been generated by a script via
 #
-#   make_travis_yml_2.hs 'haddock.cabal'
+#   runghc make_travis_yml_2.hs 'haddock.cabal'
 #
-# For more information, see https://github.com/hvr/multi-ghc-travis
+# For more information, see https://github.com/haskell-CI/haskell-ci
 #
 language: c
 sudo: false
@@ -24,54 +24,76 @@ before_cache:
   - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.tar
   - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.tar.idx
 
+  - rm -rfv $HOME/.cabal/packages/head.hackage
+
 matrix:
   include:
     - compiler: "ghc-8.6.1"
     # env: TEST=--disable-tests BENCH=--disable-benchmarks
       addons: {apt: {packages: [ghc-ppa-tools,cabal-install-head,ghc-8.6.1], sources: [hvr-ghc]}}
 
-  allow_failures:
-    - compiler: "ghc-head"
-
 before_install:
- - HC=${CC}
- - unset CC
- - PATH=/opt/ghc/bin:/opt/ghc-ppa-tools/bin:$PATH
- - PKGNAME='haddock'
+  - HC=${CC}
+  - HCPKG=${HC/ghc/ghc-pkg}
+  - unset CC
+  - ROOTDIR=$(pwd)
+  - mkdir -p $HOME/.local/bin
+  - "PATH=/opt/ghc/bin:/opt/ghc-ppa-tools/bin:$HOME/local/bin:$PATH"
+  - HCNUMVER=$(( $(${HC} --numeric-version|sed -E 's/([0-9]+)\.([0-9]+)\.([0-9]+).*/\1 * 10000 + \2 * 100 + \3/') ))
+  - echo $HCNUMVER
 
 install:
- - cabal --version
- - echo "$(${HC} --version) [$(${HC} --print-project-git-commit-id 2> /dev/null || echo '?')]"
- - BENCH=${BENCH---enable-benchmarks}
- - TEST=${TEST---enable-tests}
- - travis_retry cabal update -v
- - sed -i 's/^jobs:/-- jobs:/' ${HOME}/.cabal/config
- - rm -fv cabal.project.local
- - rm -f cabal.project.freeze
- - travis_retry cabal new-build -w ${HC} ${TEST} ${BENCH} --dep -j2 --allow-newer --constraint 'setup.Cabal installed' all
- - travis_retry cabal new-build -w ${HC} --disable-tests --disable-benchmarks --dep -j2 --allow-newer --constraint 'setup.Cabal installed' all
+  - cabal --version
+  - echo "$(${HC} --version) [$(${HC} --print-project-git-commit-id 2> /dev/null || echo '?')]"
+  - BENCH=${BENCH---enable-benchmarks}
+  - TEST=${TEST---enable-tests}
+  - HADDOCK=${HADDOCK-true}
+  - UNCONSTRAINED=${UNCONSTRAINED-true}
+  - NOINSTALLEDCONSTRAINTS=${NOINSTALLEDCONSTRAINTS-false}
+  - GHCHEAD=${GHCHEAD-false}
+  - travis_retry cabal update -v
+  - "sed -i.bak 's/^jobs:/-- jobs:/' ${HOME}/.cabal/config"
+  - rm -fv cabal.project cabal.project.local
+  - grep -Ev -- '^\s*--' ${HOME}/.cabal/config | grep -Ev '^\s*$'
+  - "printf 'packages: \".\"\\n' > cabal.project"
+  - touch cabal.project.local
+  - "if ! $NOINSTALLEDCONSTRAINTS; then for pkg in $($HCPKG list --simple-output); do echo $pkg  | grep -vw -- haddock | sed 's/^/constraints: /' | sed 's/-[^-]*$/ installed/' >> cabal.project.local; done; fi"
+  - cat cabal.project || true
+  - cat cabal.project.local || true
+  - if [ -f "./configure.ac" ]; then
+      (cd "." && autoreconf -i);
+    fi
+  - rm -f cabal.project.freeze
+  - cabal new-build -w ${HC} ${TEST} ${BENCH} --project-file="cabal.project" --dep -j2 all
+  - cabal new-build -w ${HC} --disable-tests --disable-benchmarks --project-file="cabal.project" --dep -j2 all
+  - rm -rf .ghc.environment.* "."/dist
+  - DISTDIR=$(mktemp -d /tmp/dist-test.XXXX)
 
 # 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:
- - if [ -f configure.ac ]; then autoreconf -i; fi
- - rm -rf dist/
- - cabal sdist # test that a source-distribution can be generated
- - cd dist/
- - SRCTAR=(${PKGNAME}-*.tar.gz)
- - SRC_BASENAME="${SRCTAR/%.tar.gz}"
- - tar -xvf "./$SRC_BASENAME.tar.gz"
- - cd "$SRC_BASENAME/"
-## from here on, CWD is inside the extracted source-tarball
- - rm -fv cabal.project.local
- # this builds all libraries and executables (without tests/benchmarks)
- - rm -f cabal.project.freeze
- - cabal new-build -w ${HC} --disable-tests --disable-benchmarks --allow-newer --constraint 'setup.Cabal installed'  all
- # this builds all libraries and executables (including tests/benchmarks)
- # - rm -rf ./dist-newstyle
+  # test that source-distributions can be generated
+  - (cd "." && cabal sdist)
+  - mv "."/dist/haddock-*.tar.gz ${DISTDIR}/
+  - cd ${DISTDIR} || false
+  - find . -maxdepth 1 -name '*.tar.gz' -exec tar -xvf '{}' \;
+  - "printf 'packages: haddock-*/*.cabal\\n' > cabal.project"
+  - touch cabal.project.local
+  - "if ! $NOINSTALLEDCONSTRAINTS; then for pkg in $($HCPKG list --simple-output); do echo $pkg  | grep -vw -- haddock | sed 's/^/constraints: /' | sed 's/-[^-]*$/ installed/' >> cabal.project.local; done; fi"
+  - cat cabal.project || true
+  - cat cabal.project.local || true
+  # this builds all libraries and executables (without tests/benchmarks)
+  - cabal new-build -w ${HC} --disable-tests --disable-benchmarks all
+
+  # build & run tests, build benchmarks
+  - cabal new-build -w ${HC} ${TEST} ${BENCH} all
+  - if [ "x$TEST" = "x--enable-tests" ]; then cabal new-test -w ${HC} ${TEST} ${BENCH} all; fi
+
+  # cabal check
+  - (cd haddock-* && cabal check)
 
- # build & run tests
- - cabal new-build -w ${HC} ${TEST} ${BENCH} --allow-newer --constraint 'setup.Cabal installed'   all
- - if [ "x$TEST" = "x--enable-tests" ]; then cabal new-test -w ${HC} ${TEST} --allow-newer --constraint 'setup.Cabal installed'  all; fi 
+  # Build without installed constraints for packages in global-db
+  - if $UNCONSTRAINED; then rm -f cabal.project.local; echo cabal new-build -w ${HC} --disable-tests --disable-benchmarks all; else echo "Not building without installed constraints"; fi
 
+# REGENDATA ["haddock.cabal"]
 # EOF