How to expand property references in jar resources?

Question

I\'m using Gradle to build a jar containing an xml file in META-INF. This file has a row like

Answer 1

I've had similar problems migrating from maven to gradle build. And so far the simplest/easiest solution was to simply do the filtering yourself such as:

processResources {
  def buildProps = new Properties()
  buildProps.load(file('build.properties').newReader())

  filter { String line ->
    line.findAll(/\$\{([a-z,A-Z,0-9,\.]+)\}/).each {
        def key = it.replace("\${", "").replace("}", "")
        if (buildProps[key] != null)
        {
            line = line.replace(it, buildProps[key])
        }
    }
    line
  }
}

This will load all the properties from the specified properties file and filter all the "${some.property.here}" type placeholders. Fully supports dot-separated properties in the *.properties file.

As an added bonus, it doesn't clash with $someVar type placeholders like expand() does. Also, if the placeholder could not be matched with a property, it's left untouched, thus reducing the possibility of property clashes from different sources.