add travis CI build

.ci/build_root.sh

@@ -0,0 +1,15 @@
+set -evx
+
+pushd "${DEPS_DIR}"
+ROOT_URL="https://root.cern.ch/download/root_v6.16.00.Linux-ubuntu16-x86_64-gcc5.4.tar.gz"
+
+if [[ ! -f "${DEPS_DIR}/root/bin/root-config" ]] ; then
+  echo "Downloading Root"
+  mkdir -p root
+  travis_retry wget --no-check-certificate --quiet -O - "${ROOT_URL}" | tar --strip-components=1 -xz -C root
+fi
+
+source "${DEPS_DIR}/root/bin/thisroot.sh"
+popd
+
+set +evx

.ci/travis.sh

@@ -0,0 +1,17 @@
+echo -en 'travis_fold:start:script.build\\r'
+echo "Building..."
+set -evx
+
+mkdir -p build
+cd build
+cmake ..
+cmake --build . -- -j2
+
+set +evx
+echo -e 'travis_fold:end:script.build\\r'
+echo -en 'travis_fold:start:script.test\\r'
+echo "Testing..."
+set -evx
+
+ctest --output-on-failure
+

.travis.yml

@@ -1,6 +1,13 @@
 # This will run on Travis' 'new' container-based infrastructure
 sudo: false
 
+cache:
+  ccache: true
+  apt: true
+  directories:
+  - "${TRAVIS_BUILD_DIR}/deps/root"
+  - "${TRAVIS_BUILD_DIR}/deps/doxygen"
+
 # Blacklist
 branches:
   except:
@@ -19,13 +26,13 @@ addons:
     packages:
       - doxygen
       - doxygen-doc
-#      - doxygen-latex
       - doxygen-gui
       - graphviz
 
 # Build your code e.g. by calling make
 script:
-  - echo true 
+  - chmod +x .ci/travis.sh
+  - source .ci/travis.sh
 
 # Generate and deploy documentation
 after_success: