Helpers for build gradle

build.gradle

buildscript {
    ext.versionMajor = 1
    ext.versionMinor = 0
    ext.versionPatch = 0

    ext.generateVersionCode = {
        return ext.minSdkVersion * 10000000 + ext.versionMajor * 10000 + ext.versionMinor * 100 + ext.versionPatch
    }

    ext.generateVersionName = {
        return "${ext.versionMajor}.${ext.versionMinor}.${ext.versionPatch}"
    }

    ext.getLocalProperty = { property, ifnull ->
        def propertiesFile = file("$rootProject.projectDir/local.properties")
        if (propertiesFile.exists())
            if (propertiesFile.canRead()) {
                def properties = new Properties()
                propertiesFile.withDataInputStream { properties.load(it) }
                return properties.getProperty(property, ifnull)
            } else
                throw new GradleException("Could not read local.properties")
        else
            throw new GradleException("Could not find local.properties")
    }

//...
}