api
currentBuild.rawBuild.changeSets
https://javadoc.jenkins.io/hudson/scm/ChangeLogSet.html
https://javadoc.jenkins.io/hudson/scm/ChangeLogSet.Entry.html
    getAffectedFiles()
    getAffectedPaths()
https://javadoc.jenkins.io/hudson/scm/ChangeLogSet.AffectedFile.html

def clearChangeset() {
    if (currentBuild.rawBuild.changeSets != null) {
        currentBuild.rawBuild.changeSets.clear()
    }
}

@NonCPS
def hasChanges() {
    def changeLogSets = currentBuild.rawBuild.changeSets
    for (int i = 0; i < changeLogSets.size(); i++) {
        // def kind = changeLogSets[i].kind // "svn", ...
        def items = changeLogSets[i].items
        for (int j = 0; j < items.size(); j++) {
            def author = items[j].authorName
            // .author, .msg, .msg.take(MAX_MSG_LEN), .revision
            if (author != "..... ...") {
                return true
            }
            // ...
            def files = new ArrayList(entry.affectedFiles)
            for (int k = 0; k < files.size(); k++) {
                def file = files[k]
                echo "  ${file.editType.name} ${file.path}"
            }
        }
    }
    return false
}

def getNlpModulesVersion() {
    getVersionFrom('modules/build.properties', 'nlp.modules.version')
}

def getVersionFrom(fileName, propName) {
    def propsString = readFile(fileName)
    def props = new Properties()
    props.load(new StringReader(propsString))
    props.get(propName)
}