import org.apache.tools.ant.taskdefs.condition.Os

String findCommand(String dir, String command) {

def extension = Os.isFamily(Os.FAMILY_WINDOWS) ? ".exe" : ""

def cmd = "$dir/$command$extension"

if (! new File(cmd).exists()) {

throw new Exception("Command $command not found in dir $dir")

}

cmd

}

String findJavaCommand(String command) {

def jh = System.getenv("JAVA8_HOME")

if (jh == null) {

throw new Exception("Environment variable JAVA8_HOME not set")

}

findCommand("$jh/bin", command)

}

List<String> projectClasses(List<String> list, String base) {

list.collect {

"$base/$it/build/classes/main"

}

}

def createDynamicJavadoc(String module, List<String> paths) {

def taskName = "dynamicJava8Javadoc"

task "$taskName"(type: Exec) {

def cp = projectClasses(paths, "$module/..").join(";")

def c = findJavaCommand("javadoc")

commandLine c, "-sourcepath", "$module/src/main/java", "-d", "$module/build/docs/javadoc", "-subpackages", "fj", "-Xdoclint:none", "-quiet", "-classpath", cp

}

project.tasks[taskName]

}

ext {

createDynamicJavadoc = this.&createDynamicJavadoc

findJavaCommand = this.&findJavaCommand

}

task java8Javadoc(type: Exec) {

def c = findJavaCommand("javadoc")

commandLine c, "-sourcepath", "$projectDir/src/main/java", "-d", "$buildDir/docs/javadoc", "-subpackages", "fj", "-Xdoclint:none", "-quiet"

}