.travis-ci.sh

#!/bin/bash -ue

function red_echo() {
    echo -e "\033[31m$@\033[0m"
}

function green_echo() {
    echo -e "\033[32m$@\033[0m"
}

function yellow_echo() {
    echo -e "\033[33m$@\033[0m"
}

function check_unpushed_changes() {
    source ./generate.sh # Update Dockerfile

    if git diff --name-only HEAD | grep "^dockerfiles/$TAG" >/dev/null; then
        red_echo "[ERROR] Changes for tag $TAG are not uncommited or unpushed."
        red_echo "        ./generate_all.sh and push the changes"
        git diff HEAD
        exit 127
    fi
}

## Print the difference of this pull request into STDOUT.
function git_diff_pullreq() {
    yellow_echo "Pull request: $TRAVIS_PULL_REQUEST" >&2

    if [[ "$TRAVIS_PULL_REQUEST" != false ]]; then
        curl -sL https://github.com/$TRAVIS_REPO_SLUG/pull/$TRAVIS_PULL_REQUEST.diff
    else
        local merge
        merge=$(git show | grep '^Merge: ' | awk '{print $2 ".." $3}')
        if [[ "$merge" == '' ]]; then
            yellow_echo "The latest commit is not a merge." >&2
            git show
        else
            yellow_echo "The latest commit is a merge: $merge" >&2
            git diff $merge
        fi
    fi
}

function build_image() {
    yellow_echo "[Build] $TAG: Dockerfile is changed."

    docker build -t akabe/ocaml-jupyter-datascience:$TAG dockerfiles/$TAG
    docker history akabe/ocaml-jupyter-datascience:$TAG
}

function test_image() {
    yellow_echo "[Test] $TAG"

    ./tests/run_test_on_docker.sh akabe/ocaml-jupyter-datascience:$TAG
}

function deploy_image() {
    yellow_echo "[Deploy] Deploy image tag $TAG"

    docker login -u $DOCKER_USER -p $DOCKER_PWD
    docker push akabe/ocaml-jupyter-datascience:$TAG

    for t in $ALIAS; do
        yellow_echo "[Deploy] Deploy image tag $TAG as $t"
        docker tag akabe/ocaml-jupyter-datascience:$TAG akabe/ocaml-jupyter-datascience:$t
        docker push akabe/ocaml-jupyter-datascience:$t
    done
}

check_unpushed_changes

git_diff_pullreq > pullreq.diff
cat pullreq.diff

if [[ "$TRAVIS_PULL_REQUEST" == false ]] && [[ "$TRAVIS_BRANCH" == master ]]; then
    build_image
    test_image
    deploy_image # Build and deploy images on the master branch.
elif grep "^+++ b/dockerfiles/$TAG/Dockerfile" pullreq.diff >/dev/null; then
    build_image
    test_image
else
    green_echo "[ OK ] $TAG: Dockerfile is not changed."
fi