Update exit code and prompt summary

Update exit code to 1 if error is found. In addition, it will now show
how many errors are found if there is any.

Signed-off-by: Chin Yeung Li <[email protected]>

Author: chinyeungli

src/attributecode/cmd.py

@@ -232,11 +232,16 @@ def check(location):
         if sever in important_errors:
             print_errors.append((msg_format % locals()))
 
+    number_of_important_errors = len(print_errors)
+
+    for err in print_errors:
+        print(err)
+
     if print_errors:
-        for err in print_errors:
-            print(err)
+        click.echo('Found %(number_of_important_errors)d errors' % locals())
         sys.exit(1)
-
+    else:
+        click.echo('No error is found.')
 
 def log_errors(errors, quiet, base_dir=False):
     """