cpp.gradle

// https://docs.gradle.org/6.0.1/javadoc/org/gradle/nativeplatform/platform/OperatingSystem.html
import org.gradle.internal.os.OperatingSystem
import java.nio.file.Paths

// https://docs.gradle.org/6.0.1/userguide/building_cpp_projects.html
// https://docs.gradle.org/6.0.1/userguide/cpp_library_plugin.html
// https://docs.gradle.org/6.0.1/userguide/cpp_testing.html
plugins {
    id 'cpp-library'
    id 'cpp-unit-test'
}

repositories {
    jcenter()
}

def currentSystem = OperatingSystem.current()
println "using System: $currentSystem"

def javaDir = "$System.env.JAVA_HOME"
println "using JAVA_HOME: $javaDir"

group "dev.luncliff"
version = '0.4'

// https://docs.gradle.org/6.0.1/dsl/org.gradle.api.tasks.Exec.html
task codegen(type:Exec) {
    // change the working directory
    workingDir = project.projectDir
    println "running 'javac' in $workingDir ..."

    commandLine 'javac', '-h', "src/main/headers", \
        Paths.get("src/main/java", "dev/luncliff/Module.java"), \
        Paths.get("src/main/java", "dev/luncliff/Module2.java")
}

library {
    // name of the output binary
    baseName = 'eclair' 

    // [Linkage.STATIC, Linkage.SHARED]    
    linkage = [Linkage.SHARED] 

    // https://docs.gradle.org/6.0.1/javadoc/org/gradle/nativeplatform/TargetMachineFactory.html
    targetMachines = [
        machines.windows.x86_64,
        machines.linux.x86_64,
        machines.macOS.x86_64
    ]

    // https://docs.gradle.org/6.0.1/userguide/building_cpp_projects.html#sec:custom_cpp_source_set_paths
    // https://docs.gradle.org/6.0.1/javadoc/org/gradle/api/file/ConfigurableFileCollection.html
    source.from \
        file('src/main/cpp')

    // plugin currently requires exactly one public header directory
    publicHeaders.from \
        file('src/main/public')

    // private
    privateHeaders.from \
        file("$javaDir\\include"), \
            file("$javaDir\\include\\win32"), file("$javaDir\\include\\darwin"), file("$javaDir\\include\\linux"), \
        file('src/main/cpp'), \
        file('src/main/headers')
}

// https://docs.gradle.org/6.0.1/dsl/org.gradle.nativeplatform.tasks.LinkSharedLibrary.html
tasks.withType(LinkSharedLibrary).configureEach {
    // // glob library in specific folder
    // if (currentSystem.isMacOsX()){
    //     def pattern = currentSystem.getLinkLibraryName('*.dylib')
    //     def prebuilts = fileTree(dir: "$javaDir\\lib", includes: [pattern])
    //     for (file in prebuilts.getFiles()){
    //         println "module: ${file.getName()}"
    //     }
    //     libs.from prebuilts
    // }

    // https://docs.gradle.org/6.0.1/dsl/org.gradle.nativeplatform.platform.NativePlatform.html
    linkerArgs.addAll targetPlatform.map { platform ->
        if (platform.operatingSystem.isWindows()){
            def libname = currentSystem.getLinkLibraryName('ws2_32');
            return [libname]
        }
        return []
    }
}

// https://docs.gradle.org/6.0.1/userguide/cpp_library_plugin.html#sec:cpp_library_compile_task
// https://docs.gradle.org/6.0.1/dsl/org.gradle.language.cpp.tasks.CppCompile.html
tasks.withType(CppCompile).configureEach {
    println "configure task: ${getName()}"

    // CppCompile properties
    positionIndependentCode = true
    debuggable = true

    // compile-time macro
    macros.put('DEBUG', '1')

    // compiler options
    compilerArgs.addAll toolChain.map { NativeToolChain toolChain ->
        if (toolChain in Clang) {
            return ['-Wall', '-std=c++17', '-stdlib=libc++']
        }
        if (toolChain in Gcc) {
            return ['-Wall', '-std=gnu++17']
        }
        if (toolChain in VisualCpp) {
            // boost.ut requires C++ latest
            return ['/W4', '/std:c++latest', '/utf-8']
        }
        return [] // unknown compiler
    }
}


// https://docs.gradle.org/6.0.1/userguide/cpp_unit_test_plugin.html
unitTest {
    baseName = 'eclair_test' 

    targetMachines = [
        machines.linux.x86_64,
        machines.windows.x86_64,
        machines.macOS.x86_64
    ]

    // https://docs.gradle.org/6.0.1/userguide/cpp_unit_test_plugin.html#sec:cpp_unit_test_conventions
    source.from file('test/cpp')
    privateHeaders.from \
        file('externals/ut/include'), \
        file('test/cpp')
}

// test executable may have dependency ...
tasks.withType(LinkExecutable).configureEach {
    linkerArgs.addAll targetPlatform.map { platform ->
        if (platform.operatingSystem.isWindows()){
            return [ currentSystem.getLinkLibraryName('ws2_32') ]
        }
        return []
    }
}

// https://docs.gradle.org/6.0.1/dsl/org.gradle.nativeplatform.test.tasks.RunTestExecutable.html
tasks.withType(RunTestExecutable).configureEach {
    environment.put("TEST", "true")
}