build.gradle

// Separate build file for structure heavy stuff like using Git to fetch other repos to embed within the project
apply from: 'config/gradle/utility.gradle'
apply from: 'config/gradle/ide.gradle'

// Needed for extending the "clean" task to also delete custom stuff defined here like natives
apply plugin: 'base'

// For generating IntelliJ project files
apply plugin: 'idea'

// The root project should not be an eclipse project. It keeps eclipse (4.2) from finding the sub-projects.
//apply plugin: 'eclipse'

// Git plugin details at https://github.com/ajoberstar/gradle-git
import org.ajoberstar.gradle.git.tasks.*

// Dependencies needed for what our Gradle scripts themselves use. It cannot be included via an external Gradle file :-(
buildscript {
    repositories {
        // External libs - jcenter is Bintray and is supposed to be a superset of Maven Central, but do both just in case
        jcenter()
        mavenCentral()
    }

    dependencies {
        // Artifactory plugin
        classpath(group: 'org.jfrog.buildinfo', name: 'build-info-extractor-gradle', version: '4.0.0')

        // Git plugin for Gradle
        classpath 'org.ajoberstar:gradle-git:0.6.3'

        // Needed for caching reflected data during builds
        classpath 'org.reflections:reflections:0.9.10'
        classpath 'dom4j:dom4j:1.6.1'
    }
}

// Test for right version of Java in use for running this script
assert org.gradle.api.JavaVersion.current().isJava8Compatible()

// Declare "extra properties" (variables) for the project (and subs) - a Gradle thing that makes them special.
ext {
    dirNatives = 'natives'
    dirConfigMetrics = 'config/metrics'
    templatesDir = 'templates'

    // Lib dir for use in manifest entries etc (like in :engine). A separate "libsDir" exists, auto-created by Gradle
    subDirLibs = 'libs'

    LwjglVersion = '2.9.3'
}

// Declare remote repositories we're interested in - library files will be fetched from here
repositories {
    // External libs - jcenter is Bintray and is supposed to be a superset of Maven Central, but do both just in case
    jcenter()
    mavenCentral()

    // MovingBlocks Artifactory instance for libs not readily available elsewhere plus our own libs
    maven {
        url "http://artifactory.terasology.org/artifactory/virtual-repo-live"
    }
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Natives - Handles pulling in and extracting native libraries for LWJGL                                            //
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

// Define configurations for natives and config
configurations {
    natives
    codeMetrics
}

dependencies {
    // For the "natives" configuration make it depend on the native files from LWJGL
    natives group: 'org.lwjgl.lwjgl', name: 'lwjgl', version: LwjglVersion

    // Config for our code analytics lives in a centralized repo: https://github.com/MovingBlocks/TeraConfig
    codeMetrics group: 'org.terasology.config', name: 'codemetrics', version: '1.2.0', ext: 'zip'

    // Natives for JNLua (Kallisti, KComputers)
    natives group: 'org.terasology.jnlua', name: 'jnlua_natives', version: '0.1.0-SNAPSHOT', ext: 'zip'
}

task extractWindowsNatives(type:Copy) {
    description = "Extracts the Windows natives from the downloaded zip"
    from {
        configurations.natives.collect { it.getName().contains('-natives-window') ? zipTree(it) : [] }
    }
    into ("$dirNatives/windows")
    exclude ('META-INF/**')
}

task extractMacOSXNatives(type:Copy) {
    description = "Extracts the OSX natives from the downloaded zip"
    from {
        configurations.natives.collect { it.getName().contains('-natives-osx') ? zipTree(it) : [] }
    }
    into ("$dirNatives/macosx")
    exclude ('META-INF/**')
}

task extractLinuxNatives(type:Copy) {
    description = "Extracts the Linux natives from the downloaded zip"
    from {
        configurations.natives.collect { it.getName().contains('-natives-linux') ? zipTree(it) : [] }
    }
    into ("$dirNatives/linux")
    exclude ('META-INF/**')
}

task extractJNLuaNatives(type:Copy) {
    description = "Extracts the JNLua natives from the downloaded zip"
    from {
        configurations.natives.collect { it.getName().contains('jnlua') ? zipTree(it) : [] }
    }
    into ("$dirNatives")
}

task extractNatives {
    description = "Extracts all the native lwjgl libraries from the downloaded zip"
    dependsOn extractWindowsNatives
    dependsOn extractLinuxNatives
    dependsOn extractMacOSXNatives
    dependsOn extractJNLuaNatives
}

// TODO: Test meta modules and other libs - not that there's really much to test other than being able to Git via Gradle

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Helper tasks                                                                                                      //
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

task extractConfig (type: Copy) {
    description = "Extracts our configuration files from the zip we fetched as a dependency"
    from {
        configurations.codeMetrics.collect {
            zipTree(it)
        }
    }
    into "$rootDir/$dirConfigMetrics"
}

// Helper that returns a list of all local Terasology module projects
def terasologyModules() {
    subprojects.findAll {it.parent.name == 'modules'}
}

// Helper that replaces the build.gradle under every module with a fresh copy from the Core module
task refreshModuleGradle << {
    File replacementGradle = new File(rootDir, 'modules/Core/build.gradle')
    terasologyModules().each {
        if (it.name != 'Core') {
            File targetFile = new File(rootDir, "modules/" + it.name + "/build.gradle")
            targetFile.delete()
            targetFile << replacementGradle.text
        }
    }
}

// Helpers that do magic things after having dependencies attached below
task moduleClasses
task moduleJars

// This magically makes everything work - without this the desired module projects returned have no tasks :-(
gradle.projectsEvaluated {
    // Note how "classes" may indirectly trigger "jar" for module dependencies of modules (module compile dependency)
    moduleClasses.dependsOn(terasologyModules().classes)

    // This makes it work for a full jar task
    moduleJars.dependsOn(terasologyModules().jar)
}

// This is a TEMPORARY tweak to make "changing" dependencies always ('0') check for newer snapshots available
// TODO: Remove this when versioning and promotion works fully, then we shouldn't care about snapshots normally anyway
configurations.all {
    resolutionStrategy.cacheChangingModulesFor 0, 'seconds'
}

// Include deletion of extracted natives in the global clean task. Without the doLast it runs on *every* execution ...
clean.doLast {
    new File(dirNatives).deleteDir()
    new File(dirConfigMetrics).deleteDir()
    println "Cleaned root - don't forget to re-extract stuff! 'gradlew extractNatives extractConfig' will do so, or 'gradlew idea' (or eclipse)"
}

task protobufCompileWindows(type:Exec) {
    description = "Run 'Protobuf Compiler' (Windows)"
    commandLine 'protobuf\\compiler\\protoc.exe', '--proto_path=engine\\src\\main\\protobuf', '--java_out', 'engine\\src\\main\\java', 'engine\\src\\main\\protobuf\\*'
}

task protobufCompileLinux(type:Exec) {
    description = "Run 'Protobuf Compiler' (Linux)"
    commandLine 'protobuf/compiler/protoc', '--proto_path=engine/src/main/protobuf', '--java_out', 'engine/src/main/java', "engine/src/main/protobuf/EntityData.proto", "engine/src/main/protobuf/NetMessage.proto"
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// General IDE customization                                                                                         //
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

task copyInMissingTemplates {
    description = "Copies in placeholders from the /templates dir to project root if not present yet"
    File gradlePropsFile = new File(rootDir, 'gradle.properties')
    File OverrideCfgFile = new File(rootDir, 'override.cfg')
    if (!gradlePropsFile.exists()) {
        new File(rootDir, 'gradle.properties') << new File(templatesDir, 'gradle.properties').text
    }
    if (!OverrideCfgFile.exists()) {
        new File(rootDir, 'override.cfg') << new File(templatesDir, 'override.cfg').text
    }
}

// Make sure the IDE prep includes extraction of natives
ideaModule.dependsOn extractNatives
ideaModule.dependsOn copyInMissingTemplates

// For IntelliJ add a bunch of excluded directories
idea {

    // Exclude Eclipse dirs
    // TODO: Update this as Eclipse bin dirs now generate in several deeper spots rather than at top-level
    module.excludeDirs += file('bin')
    module.excludeDirs += file('.settings')
    // TODO: Add a single file exclude for facades/PC/Terasology.launch ?

    // Exclude special dirs
    module.excludeDirs += file('natives')
    module.excludeDirs += file('protobuf')

    // Exclude output dirs
    module.excludeDirs += file('configs')
    module.excludeDirs += file('logs')
    module.excludeDirs += file('saves')
    module.excludeDirs += file('screenshots')
    module.excludeDirs += file('terasology-server')
    module.excludeDirs += file('terasology-2ndclient')

    module.downloadSources = true

    project {
        // Set JDK
        jdkName = '1.8'
        wildcards -= '!?*.groovy'

        ipr {
            withXml { xmlProvider ->
                // Apply a bunch of tweaks to IntelliJ config - all defined in ide.gradle
                // Part reason for separate file was in case a module needs to define something it cannot do so in a project block
                def iprNode = xmlProvider.asNode()
                ideaActivateCheckstyle(iprNode)
                ideaActivateCopyright(iprNode)
                ideaActivateAnnotations(iprNode)
                ideaActivateGit(iprNode)
                ideaActivateGradle(iprNode)
            }

            // Sets sourceCompatibility within IntelliJ (without this root build having the Java plugin applied)
            whenMerged {project ->
                project.jdk.languageLevel = 'JDK_1_8'
            }
        }
    }

    // Tweaks to the .iws
    workspace.iws.withXml { xmlProvider ->
        def iwsNode = xmlProvider.asNode()
        ideaMakeAutomatically(iwsNode)
        ideaRunConfig(iwsNode)
    }
}

cleanIdea.doLast {
    new File('Terasology.iws').delete()
}