static IDisposable beginWatching(
IReadFileSystem rfs,
string sourcePath,
string targetPath,
Action<string> sourceChange,
Action<string> targetChange)
{
var src = rfs.beginWatch(sourcePath, sourceChange);
var target = rfs.beginWatch(targetPath, targetChange);
return new DisposeAction(() =>
{
target.Dispose();
src.Dispose();
});
}
