An osx app bundle plugin for sbt

To build this code, get and install SBT from
    https://github.com/sbt/sbt

Get and install these plugins before building:
    https://github.com/ritschwumm/xsbt-util
    https://github.com/ritschwumm/xsbt-classpath

Build and publish the plugin:
    git clone git@github.com:ritschwumm/xsbt-osxapp.git
    cd xsbt-osxapp
    sbt publish-local

Add the plugin to your project in project/plugins.sbt:
    addSbtPlugin("de.djini" % "xsbt-osxapp" % <version>)

Include the plugin in your project's build.sbt:

    osxappMainClass     := Some("my.Main")

    osxappBundleIcons   := file("default.icns")

    osxappVmOptions     := Seq("-Xmx128m")

The osxappVM key lets you choose which java VM you want to use. To use a regular
JVM from Oracle insert this code:

    // path defaults to /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java
    osxappVm    := OracleJava("/path/to/java/command")

To use Apple's java 6 VM and their JavaApplicationStub, insert this code:

    // path defaults to /System/Library/Frameworks/JavaVM.framework/Versions/Current/Resources/MacOS/JavaApplicationStub
    osxappVm    := AppleJava6("1.6+", file("/path/to/JavaApplicationStub"))

You can leave out this key to assume OracleJava() with the default path.

Run the osxapp task to get a directory containing a os x application bundle.

To create a zip file from the application, you can use the xsbt-zipper plugin:

    // osxapp::zipper
    inTask(osxappBuild)(zipperSettings ++ Seq(
        zipperFiles     := selectSubpaths(osxappBuild.value, -DirectoryFilter).toSeq,
        zipperBundle    := zipperBundle.value + ".app"
    ))