language: go
sudo: false

go:
  - 1.10.x
  - 1.11.x
  - 1.12.x  
  - 1.13.x
  - 1.14.x
  - 1.15.x

cache:
  directories:
    - $HOME/.cache/go-build
    - $HOME/gopath/pkg/mod

env:
  global:
    - GO111MODULE=on

before_install:
  - go get github.com/mattn/goveralls
  - go get golang.org/x/tools/cmd/cover
  - go get golang.org/x/tools/cmd/goimports
  - go get golang.org/x/lint/golint
script:
  - gofiles=$(find ./ -name '*.go') && [ -z "$gofiles" ] || unformatted=$(goimports -l $gofiles) && [ -z "$unformatted" ] || (echo >&2 "Go files must be formatted with gofmt. Following files has problem:\n $unformatted" && false)
  - golint ./... # This won't break the build, just show warnings
  - $HOME/gopath/bin/goveralls -service=travis-ci