fs.js

// When vertx file system functions mirror node file system
// functions, we can use this high-order function to
// delegate. It passes args unmolested into the vertx
// API, and provides a possibly converted return value
// (or callback arg). If the type/order of function
// arguments don't match up between vertx and node, then
// don't use this function.
function delegateFunction(f, converter) {
  return function() {
    if (!converter) { converter = function(result) { return result; }; }
    var args = Array.prototype.slice.call(arguments);
    var last = args[args.length - 1];
    if (typeof last === 'function') {
        args[args.length - 1] = nodyn.vertxHandler(last, converter);
    }
    return converter(f.apply(system, args));
  };
}

FS.truncate      = delegateFunction(system.truncate);
FS.truncateSync  = delegateFunction(system.truncateSync);
FS.ftruncate     = delegateFunction(system.truncate);
FS.ftruncateSync = delegateFunction(system.truncateSync);
FS.rename        = delegateFunction(system.move);
FS.renameSync    = delegateFunction(system.moveSync);
FS.readdir       = delegateFunction(system.readDir, nodyn.arrayConverter);
FS.readdirSync   = delegateFunction(system.readDirSync, nodyn.arrayConverter);
FS.chown         = delegateFunction(system.chown);
FS.fchown        = delegateFunction(system.chown);
FS.lchown        = delegateFunction(system.chown);
FS.chownSync     = delegateFunction(system.chownSync);
FS.fchownSync    = delegateFunction(system.chownSync);
FS.lchownSync    = delegateFunction(system.chownSync);
FS.readlink      = delegateFunction(system.readSymlink);
FS.readlinkSync  = delegateFunction(system.readSymlinkSync);
FS.unlink        = delegateFunction(system.unlink);
FS.unlinkSync    = delegateFunction(system.unlinkSync);
FS.rmdir         = delegateFunction(system.delete);
FS.rmdirSync     = delegateFunction(system.deleteSync);
FS.stat          = delegateFunction(system.props,      function(result) { return new Stat(result); } );
FS.stat          = delegateFunction(system.propsSync,  function(result) { return new Stat(result); } );
FS.stat          = delegateFunction(system.lprops,     function(result) { return new Stat(result); } );
FS.stat          = delegateFunction(system.lpropsSync, function(result) { return new Stat(result); } );