RateYourMusic Collection Buttons

rym_collection_buttons.js

// ==UserScript==
// @name		RateYourMusic Collection Buttons
// @include		*://rateyourmusic.com/collection/*
// @grant		metadata
// @require		http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js
// ==/UserScript==

const tReleaseTypes = [["typs", "albums"],
					["type", "eps"],
					["typi", "singles"],
					["typm", "mixtapes"],
					["typj", "dj mixes"],
					["typc", "compilations"],
					["typd", "videos"],
					["typb", "bootlegs"],
					["", "everything"]];

if (tReleaseTypes.length == 0 || document.getElementById('breadcrumb') === null) return;

const sURL = window.location.toString(); // This will probably be changed later, but is temporary storage for the whole URL
var tURL = sURL.split('/');
var sPrefix, sSuffix;

// "collection" must be at least the second-to-last element with the last being the username
// Our target is the element afterwards, the collection modifiers, which might or might not exist
var u = tURL.length - 1;

// If there are no current collection modifiers
if (tURL[u] === "collection")
{
	// Prefix is already set, but make sure the last character is a slash
	if (sPrefix[sPrefix.length] === '/')
	{
		sPrefix = sURL.trimEnd();
	}
	else
	{
		sPrefix = sURL.trimEnd() + '/';
	}

	sSuffix = "";
}
// if "collection" appears before the second-to-last element
else
{
	// FIXME: Clear multiple type modifiers in the URL

	while (--u !== 0)
	{
		if (tURL[u] !== "collection") continue;

		const sModifiers = tURL[u + 2];

		// If the modifiers are the last element, don't add an extra slash
		sSuffix = (u + 2 === tURL.length) ? "" : ('/' + tURL.slice(u + 3).join('/'));

		// Append everything before the modifiers
		tURL.length = u + 2;
		sPrefix = tURL.join('/') + '/';

		// If it's an empty string, the prefix and suffix can just be appended to the type modifier
		if (sModifiers !== "")
		{
			// Test if the only modifier is a type
			if (sModifiers.length === 4)
			{
				// If there is no type modifier, append to the end of the current properties
				if (sModifiers.match(/typ\w/) === null)
				{
					sPrefix += sModifiers + ',';
				}

				// If there is a type modifier, it can be simply left off and the new one will be appended
			}
			else
			{
				const tMatch = sModifiers.match(/(^|,)typ\w($|,)/);

				// If there is no type modifier, add it to the end of the current modifiers
				if (tMatch === null)
				{
					sPrefix += sModifiers + ',';
				}
				// If the type modifier is at the beginning, add the rest of the modifiers to the suffix
				else if (tMatch.index === 0)
				{
					sSuffix = sModifiers.substring(4) + sSuffix;
				}
				// If the type modifier is at the end, add the rest of the modifiers to the prefix
				else if (tMatch.index === tURL.length - 5)
				{
					// Include the comma
					sPrefix += sModifiers.substring(0, tURL.length - 4);
				}
				// Add everything surrounding the type modifier to the prefix and suffix
				else
				{
					// Include the comma on both ends
					sPrefix += sModifiers.substring(0, tMatch.index + 1);
					sSuffix = sModifiers.substring(tMatch.index + 5) + sSuffix;
				}
			}
		}

		break;
	}

	// Not on a collection page?
	if (u === 0) return;
}

// Iterate in reverse as buttons are appended from the head
u = tReleaseTypes.length;

do
{
	const tReleaseType = tReleaseTypes[--u];

	$('#breadcrumb').after("<a id=\""
		+ tReleaseType[1] + "CollectionBtn\" href=\"javascript:void(0);\" class=\"printbutton\" title=\"limit to "
		+ tReleaseType[1] + " only\">" + tReleaseType[1] + "</a>");
	$("#" + tReleaseType[1] + "CollectionBtn").attr("href",
		// Edge-case: if we're appending nothing and our suffix is only a slash
		// don't add it to prevent double slashes
		tReleaseType[0] === "" && sSuffix.trimEnd() == '/' ? sPrefix
		: (sPrefix + tReleaseType[0] + sSuffix));
} while (u !== 0);