An example of a River5 callback script that's called whenever a river is built

buildRiverCallbackExample.js

//two globals are set up by River5 for buildRiver callbacks, fname and jsontext.
//this example creates a copy of the river in a folder on another disk, named Montreal.

var f = "/Volumes/Montreal/tmp/rivers/" + fname;
fsSureFilePath (f, function () {
	fs.writeFile (f, jsontext);
	});