.travis.yml

sudo: required
dist: xenial

language: java

jdk:
  - openjdk8
  - openjdk11

cache:
  directories:
  - $HOME/.m2
  - $HOME/.p2

before_install:
  - echo "MAVEN_OPTS='-Xms1g -Xmx2g'" > ~/.mavenrc
install:
  - |
    function extra_maven_opts() {
        if [ "$TRAVIS_JDK_VERSION" != "openjdk8" ]; then echo "-Denforcer.skip=true"; fi;
    }
    function prevent_timeout() {
        local i=0
        while [ -e /proc/$1 ]; do
            # print zero width char every 3 minutes while building
            if [ "$i" -eq "180" ]; then printf %b '\u200b'; i=0; else i=$((i+1)); fi
            sleep 1
        done
    }
    function print_reactor_summary() {
        sed -ne '/\[INFO\] Reactor Summary.*:/,$ p' "$1" | sed 's/\[INFO\] //'
    }
    function mvnp() {
        set -o pipefail # exit build with error when pipes fail
        local command=(mvn $@)
        exec "${command[@]}" 2>&1 | # execute, redirect stderr to stdout
            tee .build.log | # write output to log
            stdbuf -oL grep -aE '^\[INFO\] Building .+ \[.+\]$' | # filter progress
            sed -uE 's/^\[INFO\] Building (.*[^ ])[ ]+\[([0-9]+\/[0-9]+)\]$/\2| \1/' | # prefix project name with progress
            sed -e :a -e 's/^.\{1,6\}|/ &/;ta' & # right align progress with padding
        local pid=$!
        prevent_timeout $pid &
        wait $pid
    }
after_success:
  - print_reactor_summary .build.log
after_failure:
  - tail -n 2000 .build.log
env: # required for allowing failures
matrix:
  allow_failures:
    - jdk: openjdk11
script:
  - mvnp clean verify -B $(extra_maven_opts)