Simple Version Management for Gradle

settings.gradle.kts

gradle.projectsLoaded {
    @Suppress("UNCHECKED_CAST")
    val versions = java.util.Properties().apply {
        load(rootProject.file("version.properties").inputStream())
    } as Map<String, String>

    allprojects {
        // We export the versions so that our tasks can access them
        // programmatically as well if required.
        extra["versions"] = versions

        configurations {
            all {
                resolutionStrategy {
                    eachDependency {
                        if (requested.version == "_") {
                            val id = requested.module.toString()
                            if (versions.containsKey(id)) {
                                useVersion(versions.getValue(id))
                            } else {
                                var group = requested.group
                                do {
                                    if (versions.containsKey(group)) {
                                        useVersion(versions.getValue(group))
                                        break
                                    }
                                    group = group.substringBeforeLast('.')
                                } while (group.contains('.'))
                            }
                        }

                        // https://github.com/nebula-plugins/gradle-resolution-rules-plugin/issues/97
                        if (requested.group == "com.google.guava" && requested.version?.contains("-android") == true) {
                            useVersion(requested.version!!.replace("-android", "-jre"))
                            because("Android Guava lacks certain optimizations: https://github.com/google/guava/issues/2914")
                        }
                    }
                }
            }
        }
    }
}

version.properties

# suppress inspection "UnusedProperty" for whole file
#
# This file is loaded in buildSrc/settings.gradle.kts and used for all
# dependencies, including plugins, to automatically set their version. You can
# either set the version for a complete group, or a particular module.
#
# There is https://jmfayard.github.io/refreshVersions/ which works similarly to
# what we are doing here on our own, plus it can check for new releases. We
# tried adding it but it fails right away. Maybe we can try this again later.
#
# KEEP ALPHABETICALLY SORTED TO AID HUMANS IN SEARCHING!
org.apache.kafka=2.5.1
org.apache.logging.log4j=2.14.0
org.apache.logging.log4j\:log4j-api-kotlin=1.0.0