pipeline {
    agent { label 'pr-lint-slave' }
    options {
        timestamps()
        ansiColor('xterm')
        timeout(time: 3, unit: 'HOURS') 
    }
    environment {
        PYENV_ROOT = "/usr/local/pyenv"
        PATH = "$PYENV_ROOT/bin:$PATH"
        PY_COLORS = 1
    }
    stages {
        stage('github-pending') {
            steps {
                githubNotify credentialsId: 'test-jenkins-credentials',
                    description: 'Python lint on changes begins...',
                    status: 'PENDING',
                    context: "jenkins/pr/lint"
            }
        }
        stage('setup') {
            steps {
                sh '''
                # Need -M to detect renames otherwise they are reported as Delete and Add, need -C to detect copies, -C includes -M
                # -M is on by default in git 2.9+
                git diff --name-status -l99999 -C "origin/$CHANGE_TARGET" > file-list-status.log
                # the -l increase the search limit, lets use awk so we do not need to repeat the search above.
                gawk 'BEGIN {FS="\\t"} {if ($1 != "D") {print $NF}}' file-list-status.log > file-list-changed.log
                gawk 'BEGIN {FS="\\t"} {if ($1 == "D") {print $NF}}' file-list-status.log > file-list-deleted.log
                (git diff --name-status -l99999 -C "origin/$CHANGE_TARGET" "origin/$BRANCH_NAME";echo "---";git diff --name-status -l99999 -C "origin/$BRANCH_NAME";printenv|grep -E '=[0-9a-z]{40,}+$|COMMIT=|BRANCH') > file-list-experiment.log
                echo 254 > pylint-salt-chg.exit # assume failure
                echo 254 > pylint-salt-full.exit # assume failure
                echo 254 > pylint-tests-chg.exit # assume failure
                echo 254 > pylint-tests-full.exit # assume failure
                eval "$(pyenv init -)"
                pyenv --version
                pyenv install --skip-existing 2.7.14
                pyenv local 2.7.14
                pyenv shell 2.7.14
                python --version
                pip install tox
                '''
                archiveArtifacts artifacts: 'file-list-status.log,file-list-changed.log,file-list-deleted.log,file-list-experiment.log'
            }
        }
        stage('linting chg') {
            parallel {
                stage('lint salt chg') {
                    when {
                        expression { return readFile('file-list-changed.log') =~ /(?i)(^|\n)(salt\/.*\.py|setup\.py)\n/ }
                    }
                    steps {
                        sh '''
                        eval "$(pyenv init - --no-rehash)"
                        # tee makes the exit/return code always 0
                        grep -Ei '^salt/.*\\.py$|^setup\\.py$' file-list-changed.log | (xargs -r '--delimiter=\\n' tox -e pylint-salt ; echo "$?" >  pylint-salt-chg.exit) | tee pylint-report-salt-chg.log
                        # remove color escape coding
                        sed -ri 's/\\x1B\\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g' pylint-report-salt-chg.log
                        read rc_exit < pylint-salt-chg.exit
                        exit "$rc_exit"
                        '''
                    }
                }
                stage('lint test chg') {
                    when {
                        expression { return readFile('file-list-changed.log') =~ /(?i)(^|\n)tests\/.*\.py\n/ }
                    }
                    steps {
                        sh '''
                        eval "$(pyenv init - --no-rehash)"
                        # tee makes the exit/return code always 0
                        grep -Ei '^tests/.*\\.py$' file-list-changed.log | (xargs -r '--delimiter=\\n' tox -e pylint-tests ; echo "$?" > pylint-tests-chg.exit) | tee pylint-report-tests-chg.log
                        # remove color escape coding
                        sed -ri 's/\\x1B\\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g' pylint-report-tests-chg.log
                        read rc_exit < pylint-tests-chg.exit
                        exit "$rc_exit"
                        '''
                    }
                }
            }
            post {
                always {
                    archiveArtifacts artifacts: 'pylint-report-*-chg.log', allowEmptyArchive: true
                    step([$class: 'WarningsPublisher',
                        parserConfigurations: [[
                            parserName: 'PyLint',
                            pattern: 'pylint-report-*-chg.log'
                        ]],
                        failedTotalAll: '0',
                        useDeltaValues: false,
                        canRunOnFailed: true,
                        usePreviousBuildAsReference: true
                    ])
                }
            }
        }
        stage('linting all') {
            // perform a full linit if this is a merge forward and the change only lint passed.
            when {
                expression { return env.CHANGE_BRANCH =~ /(?i)^merge[._-]/ }
            }
            parallel {
                stage('setup full') {
                    steps {
                        githubNotify credentialsId: 'test-jenkins-credentials',
                            description: 'Python lint on everything begins...',
                            status: 'PENDING',
                            context: "jenkins/pr/lint"
                    }
                }
                stage('lint salt full') {
                    steps {
                        sh '''
                        eval "$(pyenv init - --no-rehash)"
                        (tox -e pylint-salt ; echo "$?" > pylint-salt-full.exit) | tee pylint-report-salt-full.log
                        # remove color escape coding
                        sed -ri 's/\\x1B\\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g' pylint-report-salt-full.log
                        read rc_exit <  pylint-salt-full.exit
                        exit "$rc_exit"
                        '''
                    }
                }
                stage('lint test full') {
                    steps {
                        sh '''
                        eval "$(pyenv init - --no-rehash)"
                        (tox -e pylint-tests ; echo "$?" > pylint-tests-full.exit) | tee pylint-report-tests-full.log
                        # remove color escape coding
                        sed -ri 's/\\x1B\\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g' pylint-report-tests-full.log
                        read rc_exit <  pylint-tests-full.exit
                        exit "$rc_exit"
                        '''
                    }
                }
            }
            post {
                always {
                    archiveArtifacts artifacts: 'pylint-report-*-full.log', allowEmptyArchive: true
                    step([$class: 'WarningsPublisher',
                        parserConfigurations: [[
                            parserName: 'PyLint',
                            pattern: 'pylint-report-*-full.log'
                        ]],
                        failedTotalAll: '0',
                        useDeltaValues: false,
                        canRunOnFailed: true,
                        usePreviousBuildAsReference: true
                    ])
                }
            }
        }
    }
    post {
        always {
            cleanWs()
        }
        success {
            githubNotify credentialsId: 'test-jenkins-credentials',
                description: 'Python lint test has passed',
                status: 'SUCCESS',
                context: "jenkins/pr/lint"
        }
        failure {
            githubNotify credentialsId: 'test-jenkins-credentials',
                description: 'Python lint test has failed',
                status: 'FAILURE',
                context: "jenkins/pr/lint"
            slackSend channel: "#jenkins-prod-pr", 
                color: '#FF0000', 
                message: "FAILED: PR-Job: '${env.JOB_NAME} [${env.BUILD_NUMBER}]' (${env.BUILD_URL})"
        }
    }
}