Add version printing

pylint/config.py

@@ -447,7 +447,8 @@ def _convert_definition(option, definition):
 
         args.append('--{0}'.format(option))
 
-        copy_keys = ('action', 'default', 'dest', 'help', 'metavar', 'level')
+        copy_keys = (
+            'action', 'default', 'dest', 'help', 'metavar', 'level', 'version')
         kwargs = {k: definition[k] for k in copy_keys if k in definition}
 
         if 'type' in definition:

pylint/lint.py

@@ -72,6 +72,9 @@
 from pylint.reporters.ureports import nodes as report_nodes
 
 
+FULL_VERSION = '%%(prog)s %s\nastroid %s\nPython %s' % (
+    version, astroid_version, sys.version)
+
 MANAGER = astroid.MANAGER
 
 
@@ -416,9 +419,6 @@ def __init__(self, config=None):
         self.current_name = None
         self.current_file = None
 
-        # TODO: Runner needs to give this to parser?
-        full_version = '%%prog %s\nastroid %s\nPython %s' % (
-            version, astroid_version, sys.version)
         super().__init__()
         # provided reports
         self._dynamic_plugins = set()
@@ -903,6 +903,11 @@ class CLIRunner(Runner):
           'help' : 'In Python 3 porting mode, all checkers will be '
           'disabled and only messages emitted by the porting '
           'checker will be displayed'}),
+
+        ('version',
+         {'group': 'Commands', 'action': 'version', 'version': FULL_VERSION,
+          'help': 'Print the version of pylint and important '
+          'dependencies'}),
     )
 
     option_groups = (
@@ -976,6 +981,7 @@ def run(self, args):
             'load_plugins',
             'ignore',
             'ignore_patterns',
+            'version',
         )
 
         # Call init-hook

pylint/test/test_self.py

@@ -181,6 +181,17 @@ def test_generate_rcfile_no_obsolete_methods(self):
         output = out.getvalue()
         assert "profile" not in output
 
+    def test_version(self):
+        """Test version printing."""
+        out = six.StringIO()
+        self._run_pylint(['--version'], out=out)
+        output = out.getvalue()
+        # The name of pylint in version output is dependant on
+        # invokation (argparse %(prog)s). Python version could be
+        # something like PyPy. astroid is the most contant name, and we
+        # just want to test the version flag is wired up to print.
+        assert 'astroid ' in output
+
     def test_inexisting_rcfile(self):
         out = six.StringIO()
         with pytest.raises(IOError) as excinfo: