build.gradle

apply plugin: 'java'
apply plugin: 'eclipse'
// apply plugin: 'base'

repositories {
    mavenCentral()
}

dependencies {
    implementation 'junit:junit:4.13.2'
    implementation 'org.hamcrest:hamcrest:2.2'
}

sourceSets {
    main {
        java {
            // srcDirs = ['common', 'leetcode', 'gcj', 'poj', 'ctci', 'other']
            // exclude '**/tmp/**'
            srcDir 'lib'
            srcDir { 
                file('leetcode').listFiles().findAll { it.isDirectory() && it.name != 'tmp' }
            }
            srcDir { 
                file('hackerrank').listFiles().findAll { it.isDirectory() && it.name != 'tmp' }
            }
            srcDir {
                file('poj').listFiles().findAll { it.isDirectory() && it.name != 'tmp' }
            }
            srcDir {
                file('usaco').listFiles().findAll { it.isDirectory() && it.name != 'tmp' }
            }
            srcDir {
                file('ctci').listFiles().findAll { it.isDirectory() && it.name != 'tmp' }
            }
            srcDir {
                file('other').listFiles().findAll { it.isDirectory() && it.name != 'tmp' }
            }
            def dirs = []
            file('gcj').listFiles().findAll { it.isDirectory() && it.name.startsWith('2')}.each { dirs << it.listFiles() }
            srcDir dirs
        }
        resources {
            srcDirs = ['src/resources']
        }
    }
}

task cleanAll(dependsOn: clean, type: Delete) {
    description 'Clean all generated files.'
    delete 'bin'
    fileTree(projectDir){ include '**/*.class' }.each{ delete it }

    doLast {
        println 'done with clean all'
    }
}

cleanAll.dependsOn {
    tasks.findAll { it.name.startsWith('clean') && it.name != 'cleanAll' }
}