Copying a file with keyword expansion

build.gradle

//Copying a file with keyword expansion
versionId = '1.6'

task copyProductionConfig(type: Copy) {
  from 'source'
  include 'config.properties'
  into 'build/war/WEB-INF/config'
  expand([
    databaseHostname: 'db.company.com',
    version: versionId,
    buildNumber: (int)(Math.random() * 1000),
    date: new Date()
  ])
}

config

#
# Application configuration file
#
hostname: db.company.com
appVersion: 1.6
locale: en_us
initialConnections: 10
transferThrottle: 5400
queueTimeout: 30000
buildNumber: 77
buildDate 20120105T162959-0700

config.properties

#
# Application configuration file
#
hostname: ${databaseHostname}
appVersion: ${version}
locale: en_us
initialConnections: 10
transferThrottle: 5400
queueTimeout: 30000
buildNumber: ${buildNumber}
buildDate: ${date.format("yyyyMMdd'T'HHmmssZ")}