add codestyle travis

.travis.yml

+language: generic 
+sudo: required
+dist: trusty
+
+services:
+  - docker
+
+os:
+  - linux
+
+env:
+  - JOB=check_style
+
+before_install:
+  # For pylint dockstring checker
+  - sudo pip install pylint pytest astroid isort
+  - |
+    function timeout() { perl -e 'alarm shift; exec @ARGV' "$@"; }
+
+script:
+  - "travis_wait 30 sleep 1800 &"
+  - |
+    # 43min timeout
+    tools/build_script.sh ${JOB}
+    if [ $? -eq 0 ] || [ $? -eq 142 ]; then true; else exit 1; fi;
+
+notifications:
+  email:
+    on_success: change
+    on_failure: always
+

tools/build_script.sh

+function init() {
+    RED='\033[0;31m'
+    BLUE='\033[0;34m'
+    BOLD='\033[1m'
+    NONE='\033[0m'
+
+    ROOT="$( cd "$( dirname "${BASH_SOURCE[0]}")/../../" && pwd )"
+}
+
+function check_style() {
+  trap 'abort' 0
+  set -e
+
+  if [ -x "$(command -v gimme)" ]; then
+    eval "$(GIMME_GO_VERSION=1.8.3 gimme)"
+  fi
+
+  pip install cpplint
+  # set up go environment for running gometalinter
+  mkdir -p $GOPATH/src/github.com/SeiriosPlus/PaddleRec
+  ln -sf ${ROOT} $GOPATH/src/github.com/SeiriosPlus/PaddleRec
+
+  export PATH=/usr/bin:$PATH
+  pre-commit install
+  clang-format --version
+
+  if ! pre-commit run -a; then
+    git diff
+    exit 1
+  fi
+
+  trap : 0
+}
+
+function main() {
+  local CMD=$1
+  init
+  case $CMD in
+    check_style)
+    check_style
+    ;;
+}
+
+main $@