add coverage checker

build/.gitignore

@@ -0,0 +1,3 @@
+*
+!.gitignore
+!coverage-checker.php

build/coverage-checker.php

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+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license.
+ */
+
+/**
+ * Code coverage checker. Analyzes a given `clover.xml` report produced
+ * by PHPUnit and checks if coverage fits expected ratio
+ *
+ * Usage:
+ *     php coverage-checker <path-to-clover> <pass-percentage>
+ *
+ * @author Marco Pivetta <ocramius@gmail.com>
+ */
+
+$inputFile = $argv[1];
+$percentage = min(100, max(0, (int) $argv[2]));
+
+if (!file_exists($inputFile)) {
+    throw new InvalidArgumentException('Invalid input file provided');
+}
+
+if (!$percentage) {
+    throw new InvalidArgumentException('An integer checked percentage must be given as second parameter');
+}
+
+$xml = new SimpleXMLElement(file_get_contents($inputFile));
+/* @var $metrics SimpleXMLElement[] */
+$metrics = $xml->xpath('//metrics');
+
+$totalElements = 0;
+$checkedElements = 0;
+
+foreach ($metrics as $metric) {
+    $totalElements   += (int) $metric['elements'];
+    $checkedElements += (int) $metric['coveredelements'];
+}
+
+$coverage = round(($checkedElements / $totalElements) * 100);
+
+if ($coverage < $percentage) {
+    echo 'Code coverage is ' . $coverage . '%, which is below the accepted ' . $percentage . '%' . PHP_EOL;
+    exit(1);
+}
+
+echo 'Code coverage is ' . $coverage . '% - OK!' . PHP_EOL;