Jenkins pipeline script that will create an HTML formatted list of Jira issues

JenkinsPipeline_getJiraIssuesList.groovy

def getJiraIssueList() {
    /**
     * Returns an HTML formatted list of Jira issues related in the build.
     * This requires the Jenkins JIRA Pipeline Steps plugin https://jenkinsci.github.io/jira-steps-plugin/getting-started/
     * @param None
     * @return An HTML string containing Jira issues
     */ 

    def jiraServer = 'JIRA-PROD' // Define a Jira server entry in the Jenkins Jira Steps configuration named JIRA-PROD
    def jiraURL = "http://my.jiraserver.com:8080" // Define the Jira URL
    def jiraIssues = jiraIssueSelector(issueSelector: [$class: 'DefaultIssueSelector']) // Get all related Jira issues in a list
    def issueList = "<h2>No changes since last build.</h2><ul>"
    
    if (jiraIssues.size() != 0) {
        issueList = "<h2>List of Changes</h2><ul>"
	    jiraIssues.each { issueID ->
            def issue = jiraGetIssue idOrKey: issueID, site: jiraServer // Retrieves the Jira issue 
            def summary = issue.data.fields.summary.toString() // Retrieves the summary field
            issueList = issueList.concat("<li><a href=\"${jiraURL}/browse/${issueID}\">${issueID} : ${summary}</a></li>")
        }
        issueList = issueList.concat("</ul>")
    }
    return (issueList)    
}