String getSWTWindowingLibrary() {
    if (ext.has('swt')) {
        switch (ext.swt) {
            case ~/.*linux.*/: return 'gtk'
            case ~/.*mac.*/: return 'cocoa'
            case ~/.*win.*/: return 'win32'
            default: return null
        }
    }

    String platform = System.properties['os.name']

    switch (platform.replaceAll(' ', '').toLowerCase()) {
        case ~/.*linux.*/: return 'gtk'
        case ~/.*darwin.*/: return 'cocoa'
        case ~/.*osx.*/: return 'cocoa'
        case ~/.*win.*/: return 'win32'
        default: return null
    }
}

String getSWTArch() {
    String arch = System.properties['os.arch']

    if (ext.has('swt')) {
        arch = ext.swt
    }

    switch (arch) {
        case ~/.*64.*/: return 'x86_64'
        default: return 'x86'
    }
}

String getSWTPlatform() {
    if (ext.has('swt')) {
        switch (ext.swt) {
            case ~/.*linux.*/: return 'linux'
            case ~/.*mac.*/: return 'macosx'
            case ~/.*win.*/: return 'win32'
            default: return null
        }
    }

    String platform = System.properties['os.name']

    switch (platform.replaceAll(' ', '').toLowerCase()) {
        case ~/.*linux.*/: return 'linux'
        case ~/.*darwin.*/: return 'macosx'
        case ~/.*osx.*/: return 'macosx'
        case ~/.*win.*/: return 'win32'
        default: return platform
    }
}

// optionally let us specify which SWT to use. options are win32/mac32/linux32 and win64/mac64/linux64
// include this in your build.gradle file, before dependencies are determined.    ext.swt = 'win64'

ext {
    //  because the eclipse release of SWT is abandoned on maven, this MAVEN repo has newer version of SWT,
    //  https://github.com/maven-eclipse/maven-eclipse.github.io   (for the website about it)
    //  http://maven-eclipse.github.io/maven  (for the maven repo)

    swtWindowingLibrary = getSWTWindowingLibrary()
    swtArch = getSWTArch()
    swtPlatform = getSWTPlatform()
}