Disable 'BINARY file' warning by default (#1441)

* Disable 'BINARY file' warning by default

Currently codespell prints a warning if it finds binary files in the tree.
This is annoying as many projects contain .git/.svn blobs, images, etc.
Disable the warning by default and let users enable it if needed.

Co-authored-by: Waldir Pimenta <waldyrious@gmail.com>

* Improve help message for the --quiet-level option

* Update _codespell.py

Co-authored-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Co-authored-by: Eric Larson <larson.eric.d@gmail.com>

codespell_lib/_codespell.py

diff --git a/codespell_lib/_codespell.py b/codespell_lib/_codespell.py
index 17fc3b9..68a0bb4 100755
--- a/codespell_lib/_codespell.py
+++ b/codespell_lib/_codespell.py
@@ -282,15 +282,20 @@
                              'is available. 3: both 1 and 2')
 
     parser.add_argument('-q', '--quiet-level',
-                        action='store', type=int, default=0,
-                        help='Bitmask that allows codespell to run quietly. '
-                             '0: the default, in which all messages are '
-                             'printed. 1: disable warnings about wrong '
-                             'encoding. 2: disable warnings about binary '
-                             'file. 4: shut down warnings about automatic '
-                             'fixes that were disabled in dictionary. '
+                        action='store', type=int, default=2,
+                        help='Bitmask that allows suppressing messages. '
+                             '0: print all messages. '
+                             '1: disable warnings about wrong encoding. '
+                             '2: disable warnings about binary files. '
+                             '4: omit warnings about automatic fixes that '
+                             'were disabled in the dictionary. '
                              '8: don\'t print anything for non-automatic '
-                             'fixes. 16: don\'t print fixed files.')
+                             'fixes. '
+                             '16: don\'t print the list of fixed files. '
+                             'As usual with bitmasks, these levels can be '
+                             'combined; e.g. use 3 for levels 1+2, 7 for '
+                             '1+2+4, 23 for 1+2+4+16, etc. '
+                             'The default mask is %(default)s.')
 
     parser.add_argument('-e', '--hard-encoding-detection',
                         action='store_true', default=False,

codespell_lib/tests/test_basic.py

diff --git a/codespell_lib/tests/test_basic.py b/codespell_lib/tests/test_basic.py
index b766451..4a54fd0 100644
--- a/codespell_lib/tests/test_basic.py
+++ b/codespell_lib/tests/test_basic.py
@@ -242,8 +242,9 @@
             f.write(b'\x00\x00naiive\x00\x00')
         capsys.readouterr()
         assert cs.main(f.name) == 0
+        assert capsys.readouterr() == ('', '')
+        assert cs.main('-q', '0', f.name) == 0
         assert 'WARNING: Binary file' in capsys.readouterr()[1]
-        assert cs.main('-q', '2', f.name) == 0
         assert capsys.readouterr() == ('', '')
     finally:
         os.remove(f.name)