added version option

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## [unreleased] - XXXX-XX-XX
+
+* Added --version option
+
 ## [1.3.1] - 2022-06-10
 
 * fixed man page

blag/blag.py

@@ -16,6 +16,7 @@ import feedgenerator
 
 from blag.markdown import markdown_factory, convert_markdown
 from blag.devserver import serve
+from blag.version import __VERSION__
 
 logger = logging.getLogger(__name__)
 logging.basicConfig(
@@ -54,6 +55,11 @@ def parse_args(args=None):
 
     """
     parser = argparse.ArgumentParser()
+    parser.add_argument(
+        '--version',
+        action='version',
+        version='%(prog)s '+__VERSION__,
+    )
 
     commands = parser.add_subparsers(dest='command')
     commands.required = True

tests/test_blag.py

@@ -277,3 +277,13 @@ foo bar
 
 def test_main(cleandir):
     blag.main(['build'])
+
+
+def test_cli_version(capsys):
+    with pytest.raises(SystemExit) as ex:
+        blag.main(['--version'])
+    # normal system exit
+    assert ex.value.code == 0
+    # proper version reported
+    out, _ = capsys.readouterr()
+    assert blag.__VERSION__ in out