Plug-In: Delete Canvases

This plug-in will delete all but the currently selected canvas.

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Delete All But Selected Canvas
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/*{
	"type": "action",
	"targets": ["omnigraffle"],
	"author": "Otto Automator",
	"identifier": "com-omni-automation.og.Delete All But Selected Canvas",
	"version": "1.0",
	"description": "This plug-in will delete every canvas except the selected canvas.",
	"label": "Delete All But Selected Canvas",
	"shortLabel": "Delete All But Selected Canvas",
	"paletteLabel": "Delete All But Selected Canvas",
	"image": "square.3.layers.3d.slash"
}*/
(() => {
	const action = new PlugIn.Action(async function(selection, sender){
		try {
			alertTitle = "CONFIRMATION REQUIRED"
			alertMsg = "Are you sure you want to remove all but the single selected canvas?"
			alert = new Alert(alertTitle, alertMsg)
			alert.addOption("Cancel")
			alert.addOption("Remove")
			alert.show(function(result) {
				if (result == 0) {
					console.log("user cancelled")
				} else {
					cnvs = document.windows[0].selection.canvas
					if(cnvs.id !== canvases[0].id){
						cnvs.orderBefore(canvases[0])
					}
					for(var i = canvases.length; i--;) { 
						if(i != 0){canvases[i].remove()}
					}
				}
			})
		}
		catch(err){
			if(!err.causedByUserCancelling){
				new Alert(error.name, err.message).show()
				console.error(err)
			}
		}
	});

	action.validate = function(selection, sender){
		return (canvases.length > 1)
	};
	
	return action;
})();