Add -l/--loglevel option

Ref: Vimjas#25

covimerage/cli.py

@@ -13,8 +13,13 @@
 @click.version_option(__version__, '-V', '--version', prog_name='covimerage')
 @click.option('-v', '--verbose', count=True, help='Increase verbosity.')
 @click.option('-q', '--quiet', count=True, help='Decrease verbosity.')
-def main(verbose, quiet):
-    if verbose - quiet:
+@click.option('-l', '--loglevel',
+              help='Set logging level explicitly (overrides -v/-q).',
+              type=click.Choice(('error', 'warning', 'info', 'debug')))
+def main(verbose, quiet, loglevel):
+    if loglevel:
+        LOGGER.setLevel(loglevel.upper())
+    elif verbose - quiet:
         LOGGER.setLevel(max(10, LOGGER.level - (verbose - quiet) * 10))
 
 

tests/test_logging.py

@@ -17,3 +17,42 @@ def test_logging_error_causes_exception(capfd):
             "Message: 'Wrong:'",
             "Arguments: ('no %s',)"]
     assert 'TypeError: not all arguments converted during string formatting' in lines  # noqa: E501
+
+
+def test_loglevel(mocker, runner, devnull):
+    from covimerage import cli
+    import logging
+
+    logger = cli.LOGGER
+
+    m = mocker.spy(logger, 'setLevel')
+
+    for level in ['error', 'warning', 'info', 'debug']:
+        result = runner.invoke(cli.main, [
+            '--loglevel', level,
+            'report', '--nonexistingoption'])
+        assert result.output.splitlines() == [
+            'Error: no such option: --nonexistingoption']
+        assert result.exit_code == 2
+
+        level_name = level.upper()
+        assert m.call_args_list[-1] == mocker.call(level_name)
+        assert logging.getLevelName(logger.level) == level_name
+
+    # -v should not override -l.
+    result = runner.invoke(cli.main, [
+            '-l', 'warning', '-vvv',
+            'report', '--nonexistingoption'])
+    assert result.output.splitlines() == [
+        'Error: no such option: --nonexistingoption']
+    assert result.exit_code == 2
+    assert logging.getLevelName(logger.level) == 'WARNING'
+
+    # -q should not override -l.
+    result = runner.invoke(cli.main, [
+            '-l', 'warning', '-qqq',
+            'report', '--nonexistingoption'])
+    assert result.output.splitlines() == [
+        'Error: no such option: --nonexistingoption']
+    assert result.exit_code == 2
+    assert logging.getLevelName(logger.level) == 'WARNING'