AlwaysKillSticky/contentScript.js

/***********/
/* HELPERS */
/***********/

/*	Given the result of a query to storage (for the matching and exclusion 
	pattern lists, and the current mode - whitelist or blacklist), this function
	determines whether stickies should be killed on the currently loaded page.

	Stickies are killed if the following is true:
	
	(blacklist mode is active, AND 
	 at least one matching pattern matches the URL of the current page, AND
	 zero exclusion patterns match the URL of the current page)
		 OR 
	 (whitelist mode is active, AND
	  zero exclusion matters match the URL of the current page)
	*/
function checkForShouldKillSticky(result) {
	var shouldKillSticky = false;

	/*	If whitelist mode is active, then the matching patterns list is treated
		as containing a single pattern which will match all possible URLs.
		Patterns that are empty strings (i.e., blank lines in the patterns 
		lists) are ignored, as are any patterns that begin with a pound sign (#)
		(this allows for comments in the patterns lists). */
	let matchingPatterns = result.mode == "whitelist" ?
						   [ ".*" ] :
						   (typeof result.matchingPatterns != "undefined" ?
							result.matchingPatterns.split("\n") :
							[ ]);
	for (let pattern of matchingPatterns) {
		if (pattern && 
			!pattern.hasPrefix("#") &&
			location.href.match(new RegExp(pattern))) {
			shouldKillSticky = true;
			break;
		}
	}
	let exclusionPatterns = typeof result.exclusionPatterns != "undefined" ?
							result.exclusionPatterns.split("\n") :
							[ ];
	for (let pattern of exclusionPatterns) {
		if (pattern && 
			!pattern.hasPrefix("#") &&
			location.href.match(new RegExp(pattern))) {
			shouldKillSticky = false;
			break;
		}
	}
	
	return shouldKillSticky;
}

/*	This function sends a message to the background script (background.js), 
	which then updates the page action icon (i.e., the browser toolbar icon)
	to reflect whether killing stickies is enabled on the current page.
	*/
function updateIcon(shouldKillSticky) {
	chrome.runtime.sendMessage({ "killingStickies" : shouldKillSticky });
}

/******************/
/* INITIALIZATION */
/******************/

function initialize() {
	chrome.storage.sync.get([ "matchingPatterns", "exclusionPatterns", "mode" ],
	(result) => {
		let shouldKillSticky = checkForShouldKillSticky(result);
		updateIcon(shouldKillSticky);
		window.onload = () => {
			if (shouldKillSticky) killSticky();
		};
	});
}
initialize();