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Including a file if some other file not loaded

You can use this trick to create mods for your mods. A basic approach can be done using just the include() function and nothing else...

if (include("path/to/mymod.custom.js") === false) { // not found
  include("path/to/mymod.default.js"); // load default settings
}

But, assuming you're starting to use dependencies, you might want a more robust approach...

include("path/to/util.js");
 
Check.paths = ["path/to/mymod"]; // enable autoloading
 
if (!Check.has("mymod.custom.js")) { // path/to/mymod.custom.js
	Check.load("mymod.default.js");  // path/to/mymod.default.js
}

The obvious problem here is that you might have dependencies that rely on "mymod.default.js", but if "mymod.custom.js" gets loaded instead those dependencies will break.

The solution to this is to provide a fake file in both "mymod.default.js" and "mymod.extend.js" and then use that for dependency checks:

// The usenormal thisprovide() iflets you wantcheck to checklater which settingsfile werewas loaded...
Check.provide(self);
 
// use this for general dependency checksThe fake provide() lets you check that any settings were loaded...
Check.provide({
	file: "settings.loaded",
	ver : self.ver
});

If you're particularly paranoid about having both file somehow get loaded, you can make sure "settings.loaded" isn't loaded during dependency checks at the top of those files...

var dependencies = {
	"Util.js": Check.ANY_VERSION,
	"settings.loaded": Check.NOT_LOADED
}
 
// will throw error if "settings.loaded" already loaded...
Check.required(dependencies, self);