source: Jenkins/tools.groovy @ 72713e5

#!groovy

import groovy.transform.Field

// For skipping stages
import org.jenkinsci.plugins.pipeline.modeldefinition.Utils

// wrapper around stage declaretion to be more verbose
// and allow showing as skipped in the UI
def BuildStage(String name, boolean run, Closure block ) {
        echo " -------- ${name} -------- "
        if(run) {
                stage(name, block)
        } else {
                stage(name) { Utils.markStageSkippedForConditional(STAGE_NAME) }
        }
}

//===========================================================================================================
// Common compilation routines
//===========================================================================================================
def Clean() {
        BuildStage('Cleanup', true) {
                // clean the build by wipping the build directory
                dir(BuildDir) {
                        deleteDir()
                }
        }
}

def Checkout(commitHash = null) {
        BuildStage('Checkout', true) {
                //checkout the source code and clean the repo
                if(commitHash) {
                        echo "Checking out commit <${commitHash}>"
                        final scmVars = checkout([$class: 'GitSCM', branches: [[name: commitHash ]],
                                userRemoteConfigs: [[
                                        url: 'cforall@plg.uwaterloo.ca:software/cfa/cfa-cc',
                                        credentialsId: 'git_key_aug20']]
                        ])
                        echo GitLogMessage(scmVars.GIT_COMMIT, scmVars.GIT_PREVIOUS_COMMIT)
                } else {
                        final scmVars = checkout scm
                        echo GitLogMessage(scmVars.GIT_COMMIT, scmVars.GIT_PREVIOUS_COMMIT)
                }
        }
}

//===========================================================================================================
//Routine responsible of sending the email notification once the build is completed
//===========================================================================================================
@NonCPS
def SplitLines(String text) {
        def list = []

        text.eachLine {
                list += it
        }

        return list
}

def ConstructGitLogMessage(String oldRef, String newRef) {
        def revText = sh(returnStdout: true, script: "git rev-list ${oldRef}..${newRef}").trim()
        def revList = SplitLines( revText )

        def gitUpdate = ""
        revList.each { rev ->
                def type = sh(returnStdout: true, script: "git cat-file -t ${rev}").trim()
                gitUpdate = gitUpdate + "       via  ${rev} (${type})"
        }

        def rev = oldRef
        def type = sh(returnStdout: true, script: "git cat-file -t ${rev}").trim()
        gitUpdate = gitUpdate + "      from  ${rev} (${type})"

        def gitLog    = sh(returnStdout: true, script: "git rev-list --format=short ${oldRef}...${newRef}").trim()

        def gitDiff   = sh(returnStdout: true, script: "git diff --stat --color ${newRef} ${oldRef}").trim()
        gitDiff = gitDiff.replace('[32m', '<span style="color: #00AA00;">')
        gitDiff = gitDiff.replace('[31m', '<span style="color: #AA0000;">')
        gitDiff = gitDiff.replace('[m', '</span>')

        return """
<p>- Changes -------------------------------------------------------------</p>

<pre>
The branch ${env.BRANCH_NAME} has been updated.
${gitUpdate}
</pre>

<p>- Log -----------------------------------------------------------------</p>

<pre>
${gitLog}
</pre>

<p>-----------------------------------------------------------------------</p>
<pre>
Summary of changes:
${gitDiff}
</pre>
"""
}

EmailMessage = ''
def GitLogMessage(String oldRef = '', String newRef = '') {
        if(!EmailMessage) {
                if (!oldRef) { return "\nERROR retrieveing current git information!\n"  }
                if (!newRef) { return "\nERROR retrieveing previous git information!\n" }

                echo "Constructing new git message"

                EmailMessage = ConstructGitLogMessage(oldRef, newRef)
        }
        else {
                echo "Reusing previously constructed message"
        }
        return EmailMessage;
}

return this;