Add option to output failures only

certo/__main__.py

@@ -1,12 +1,13 @@
 """
 Usage:
-    certo [-vj] [-d DAYS|--days-to-expiration=DAYS] [-t SECONDS|--timeout=SECONDS] <hostnames>...
+    certo [-vjf] [-d DAYS|--days-to-expiration=DAYS] [-t SECONDS|--timeout=SECONDS] <hostnames>...
     certo -h | --help
 
 Options:
    -h --help                          Show this help.
    -j                                 Output in JSON format [default: False].
    -v                                 Increase verbosity [default: False].
+   -f --failonly                      Output failures only [default: False]
    -d DAYS --days-to-expiration=DAYS  Warn about near expiration if within DAYS of the cert's notAfter [default: 5].
    -t SECONDS --timeout=SECONDS       Timeout for SSL Handshake [default: 5].
 """
@@ -23,6 +24,7 @@ async def main():
     args = docopt(__doc__)
 
     output_as_json = args.get("-j")
+    output_passes = not args.get("--failonly")
     if args.get("-v"):
         logging.getLogger().setLevel(logging.INFO)
     hostnames = args.get("<hostnames>")
@@ -30,9 +32,9 @@ async def main():
 
     # @todo factory
     if output_as_json:
-        reporter = JSONReporter()
+        reporter = JSONReporter(output_passes)
     else:
-        reporter = DefaultReporter()
+        reporter = DefaultReporter(output_passes)
 
     jobs = {
         check_host_certificate_expiration(hs, days_to_expiration) for hs in hostnames