def getPreviousTagFromVersion()

in jenkins-pipeline-shared-libraries/vars/githubscm.groovy [527:567]
33 lines of code
13 McCabe index (conditional complexity)

def getPreviousTagFromVersion(String version, String startsWith = '', String endsWith = '', List filterOutGrep = [], boolean debug = false) {
    if (debug) { println "getPreviousTagFromVersion for version = ${version}" }
    String cmd = 'git tag --sort=-committerdate'
    if (endsWith) {
        cmd += " | grep '${endsWith}\$'"
    }
    if (filterOutGrep) {
        cmd += " ${filterOutGrep.collect { "| grep -v '${it}'" }.join(' ')}"
    }
    Integer[] versionSplit = util.parseVersion(version)

    Closure searchTag = { tagToSearch, reverse ->
        if (debug) { println "Searching tag ${tagToSearch}" }
        String foundTag = sh(returnStdout: true, script: "${cmd} | grep '${tagToSearch}' | sort -V${reverse ? ' -r' : ''}")?.trim()
        if (debug) { println "Found tag ${foundTag}" }
        return foundTag ? foundTag.split('\n')[0] : ''
    }

    // Previous micro search
    int micro = versionSplit[2]
    while (micro-- > 0) {
        String foundTag = searchTag("^${startsWith}${versionSplit[0]}.${versionSplit[1]}.${micro}", true)
        if (foundTag) { return foundTag }
    }

    // Previous minor search
    int minor = versionSplit[1]
    while (minor-- > 0) {
        String foundTag = searchTag("^${startsWith}${versionSplit[0]}.${minor}.", false)
        if (foundTag) { return foundTag }
    }

    // Previous major search (different looking for)
    int major = versionSplit[0]
    while (major-- > 0) {
        String foundTag = searchTag("^${startsWith}${major}.", true)
        if (foundTag) { return foundTag }
    }

    return ''
}