exec {
     commandLine command("npm"), "install"
}

//
// find a command with this name in the path
//
String command( String name )
{
    def onWindows = (System.env.PATH==null);
    def pathBits = onWindows ? System.env.Path.split(";") : System.env.PATH.split(":");
    def isMatch = onWindows ? {path ->
                for (String extension : System.env.PATHEXT.split(";"))
                {
                    File theFile = new File( path, name + extension);
                    if (theFile.exists())
                        return theFile;
                }
                return null;
        } : {path -> def file = new File(path,name);if (file.exists() && file.canExecute()) return file;return null;}

    def foundLocal = isMatch(".");
    if (foundLocal)
        return foundLocal;
    for (String pathBit : pathBits)
    {
        def found = isMatch(pathBit);
        if (found)
            return found;
    }
    throw new TaskExecutionException(it, "Failed to find " + name + " in the path")
}