var copyGroup = function()

in make-util.js [441:506]
32 lines of code
8 McCabe index (conditional complexity)

var copyGroup = function (group, sourceRoot, destRoot) {
    // example structure to copy a single file:
    // {
    //   "source": "foo.dll"
    // }
    //
    // example structure to copy an array of files/folders to a relative directory:
    // {
    //   "source": [
    //     "foo.dll",
    //     "bar",
    //   ],
    //   "dest": "baz/",
    //   "options": "-R"
    // }
    //
    // example to multiply the copy by .NET culture names supported by TFS:
    // {
    //   "source": "<CULTURE_NAME>/foo.dll",
    //   "dest": "<CULTURE_NAME>/"
    // }
    //

    // validate parameters
    assert(group, 'group');
    assert(group.source, 'group.source');
    if (typeof group.source == 'object') {
        assert(group.source.length, 'group.source.length');
        group.source.forEach(function (s) {
            assert(s, 'group.source[i]');
        });
    }

    assert(sourceRoot, 'sourceRoot');
    assert(destRoot, 'destRoot');

    // multiply by culture name (recursive call to self)
    if (group.dest && group.dest.indexOf('<CULTURE_NAME>') >= 0) {
        cultureNames.forEach(function (cultureName) {
            // culture names do not contain any JSON-special characters, so this is OK (albeit a hack)
            var localizedGroupJson = JSON.stringify(group).replace(/<CULTURE_NAME>/g, cultureName);
            copyGroup(JSON.parse(localizedGroupJson), sourceRoot, destRoot);
        });

        return;
    }

    // build the source array
    var source = typeof group.source == 'string' ? [ group.source ] : group.source;
    source = source.map(function (val) { // root the paths
        return path.join(sourceRoot, val);
    });

    // create the destination directory
    var dest = group.dest ? path.join(destRoot, group.dest) : destRoot + '/';
    dest = path.normalize(dest);
    mkdir('-p', dest);

    // copy the files
    if (group.hasOwnProperty('options') && group.options) {
        cp(group.options, source, dest);
    }
    else {
        cp(source, dest);
    }
}