This is a simplistic reporter Blanket.js (http://migrii.github.com/blanket/) which adds a summary coverage statistic to Jasmine (http://pivotal.github.com/jasmine/) top bar. If you enable branch coverage in blanket, this reporter will highlight the files with warnings and it also change the summary statistic color.

jasmine.basic.reporter.js

/*
  Place this file in your Jasmine tests root folder and tell blanket to use it.
	
	Example:
		<script src="lib/blanket_jasmine.js" data-cover-reporter="lib/jasmine.basic.reporter.js"></script>

	If you want to catch branch coverage warning, you must enable it:
		<script src="lib/blanket_jasmine.js" data-cover-flags="branchTracking" data-cover-reporter="lib/jasmine.basic.reporter.js"></script>
*/
define([], function JasmineBasicReporter() {
	
	/**
		Iterate over a list of elements.
		@param $elements {NodeList} list of DOM elements
		@param fn {Function} callback applied to each element
	*/
	function iterateEls($elements, fn) {
		Array.prototype.forEach.call($elements, fn);
	}

	/**
		Calculates the average covering for all tested files.
		Extracts info from default Blanket reporter.
		@return averagePencent {Number}
	*/
	function calculateSummaryPercent() {
		var percentTotals = 0,
			elements = document.querySelectorAll('#blanket-main .blanket:not(.bl-title) > div:nth-child(2)');

		iterateEls(elements, function(filePercentText) {
			percentTotals += parseFloat(filePercentText.innerText.split(' ')[0], 10);
		});

		return percentTotals / elements.length;
	}

	/**
		Creates the new element which represents the report summary.
		@param coveragePencent {Number} average files coverage percent
		@param branchWarningsCount {Number} number of branch coverage warnings
		@return summaryEl {Element}
	*/
	function buildElement(coveragePercent, branchWarningsCount) {
		var el = document.createElement('span');
		el.id = "coverageSummary";
		el.className = 'bar';
		el.style.position = 'absolute';
		el.style.top = '0';
		el.style.right = '115px';
		el.innerHTML = "Coverage: <span style='" + ((branchWarningsCount) ? 'color: yellow' : '') +
			"'>" + coveragePercent.toFixed(2) + "%</span>";
		console.log(el);
		return el;
	}

	/**
		If user enabled branch coverage, I use this function to highlight
		the files which have any warning.
		Extracts info from default Blanket reporter.
	*/
	function highlightFilesWithBrachWarnings() {
		var $filesReports = document.querySelectorAll('div.blanket:not(.bl-title)'),
			$branchWarnings,
			counter = 0;

		iterateEls($filesReports, function($fileReport) {
			$branchWarnings = $fileReport.querySelectorAll('.branchWarning');
			if ($branchWarnings.length) {
				counter = $branchWarnings.length;
				$fileReport.querySelector('.bl-file a').style['background-color'] = 'yellow';
			}
		});

		return counter;
	}

	/**
		Appends coverage summary to Jasmine report.
		@param $summary {Element} summary element
	*/
	function appendSummary($summary) {
		$container = document.querySelector('div.alert');
		$container.style.position = 'relative';
		$container.appendChild($summary);
	}

	return function(coverageData) {
		var averagePercent, $summary, branchWarningsCount;

		// Append standard blanket coverage
		blanket.defaultReporter(coverageData);

		// Calculate average coverage
		averagePercent = calculateSummaryPercent();
		
		// If branch coverage was enabled, highlight files with warnings
		branchWarningsCount = highlightFilesWithBrachWarnings();

		// Create summary coverage element
		$summary = buildElement(averagePercent, branchWarningsCount);

		// Append new element to Jasmine report
		appendSummary($summary);
		
	};
	
});