How to use the cget.util function in cget

def init_command(prefix, toolchain, cc, cxx, cflags, cxxflags, ldflags, std, define, shared, static):
    """ Initialize install directory """
    if shared and static:
        click.echo("ERROR: shared and static are not supported together")
        sys.exit(1)
    defines = util.to_define_dict(define)
    if shared: defines['BUILD_SHARED_LIBS'] = 'On'
    if static: defines['BUILD_SHARED_LIBS'] = 'Off'
    prefix.write_cmake(
        always_write=True, 
        toolchain=toolchain, 
        cc=cc,
        cxx=cxx,
        cflags=cflags, 
        cxxflags=cxxflags, 
        ldflags=ldflags, 
        std=std, 
        defines=defines)

def unlink(self, pkg, delete=False):
        pkg = self.parse_pkg_src(pkg)
        pkg_dir = self.get_package_directory(pkg.to_fname())
        unlink_dir = self.get_unlink_directory(pkg.to_fname())
        self.log("Unlink:", pkg_dir)
        if os.path.exists(pkg_dir):
            if util.USE_SYMLINKS:
                util.rm_symlink_from(os.path.join(pkg_dir, 'install'), self.prefix)
            else:
                util.rm_dup_dir(os.path.join(pkg_dir, 'install'), self.prefix, remove_both=False)
            util.rm_empty_dirs(self.prefix)
            if delete: shutil.rmtree(pkg_dir)
            else:
                util.mkdir(self.get_unlink_directory())
                os.rename(pkg_dir, unlink_dir)

def clean(self):
        if util.USE_SYMLINKS:
            util.delete_dir(self.get_private_path())
            util.rm_symlink_dir(self.prefix)
            util.rm_empty_dirs(self.prefix)
        else:
            for p in self.list():
                self.remove(p)
            util.delete_dir(self.get_private_path())

def unlink(self, pkg, delete=False):
        pkg = self.parse_pkg_src(pkg)
        pkg_dir = self.get_package_directory(pkg.to_fname())
        unlink_dir = self.get_unlink_directory(pkg.to_fname())
        self.log("Unlink:", pkg_dir)
        if os.path.exists(pkg_dir):
            if util.USE_SYMLINKS:
                util.rm_symlink_from(os.path.join(pkg_dir, 'install'), self.prefix)
            else:
                util.rm_dup_dir(os.path.join(pkg_dir, 'install'), self.prefix, remove_both=False)
            util.rm_empty_dirs(self.prefix)
            if delete: shutil.rmtree(pkg_dir)
            else:
                util.mkdir(self.get_unlink_directory())
                os.rename(pkg_dir, unlink_dir)

def __init__(self, prefix, verbose=False, build_path=None):
        self.prefix = os.path.abspath(prefix or 'cget')
        self.verbose = verbose
        self.build_path_var = build_path
        self.cmd = util.Commander(paths=[self.get_path('bin')], env=self.get_env(), verbose=self.verbose)
        self.toolchain = self.write_cmake()