Fix generating docs

The coverage report format has changed in Xcode 9.4. Since Xcode comes
with it's own `xccov` tool, we don't need to use `xcov-core` anymore and
extract the coverage directly by the JSON produced by the `xccov` tool.

build-docs.sh

@@ -75,9 +75,7 @@ if [ ${RUN_TESTS} = true ]; then
 		clean\
 		test
 
-	xcov-core\
-		--source build/Logs/Test/*.xccoverage\
-		--output build/coverage.json
+	xcrun xccov view --json build/Logs/Test/*.xccovreport > build/coverage.json
 
 	COVERAGE=$(
 		python3 "extract_coverage.py" "${MODULE}.framework" < build/coverage.json

extract_coverage.py

@@ -12,7 +12,7 @@
 j = json.load(sys.stdin)
 for i in range(len(j["targets"])):
 	if j["targets"][i]["name"] == framework:
-		print("{0:.0f}".format(j["targets"][i]["coverage"] * 100))
+		print("{0:.0f}".format(j["targets"][i]["lineCoverage"] * 100))
 		exit(0)
 
 exit(1)