Groovy script to parse changelog from merge commit message

changelog.gradle

def parseCommitTxt(commit) {
    def commitPattern = /^(feat|fix|docs|ci|style|refactor|test|chore)(?:\((.+)\))?: (.+)$/
    def commitBody = "git show -s ${commit} --pretty=format:%b".execute().text
    def commitMsg = commitBody.split("See merge request")[0].trim()
    def type, scope, subject
    try {
        def (_, t, sc, s) = (commitMsg =~ commitPattern)[0]
        type = t
        scope = sc
        subject = s
    } catch (ignored) {
        type = "other"
        subject = commitMsg
    }

    // parse MR number
    def mrInfo = ""
    try {
        def mrNumberPattern = "(![0-9]+)\$"
        def mrNumber = commitBody.find(mrNumberPattern).replace('!', "")
        mrInfo = "[[MR!${mrNumber}](https://yourgitrepo/merge_requests/${mrNumber})]"
    } catch (ignore) {
    }

    def jiraInfo = ""
    if (scope) {
        scope.split(',')
                .each { token ->
                    jiraInfo += "|[[Jira!${token.toString().trim()}](http://jira.com/browse/${token.toString().trim()})]"
                }
    }
    def info = [:]
    info["type"] = type
    info["text"] = "* ${subject.capitalize()} ${mrInfo}${jiraInfo}\n"
    return info
}