Add version subcommand (#29)

src/blurb/blurb.py

@@ -742,6 +742,13 @@ def get_subcommand(subcommand):
 
 
 
+@subcommand
+def version():
+    """Print blurb version."""
+    print("blurb version", __version__)
+
+
+
 @subcommand
 def help(subcommand=None):
     """
@@ -816,8 +823,10 @@ def help(subcommand=None):
     print(doc)
     sys.exit(0)
 
-# Make "blurb --help" work.
+# Make "blurb --help/--version/-V" work.
 subcommands["--help"] = help
+subcommands["--version"] = version
+subcommands["-V"] = version
 
 
 def _find_blurb_dir():
@@ -1215,7 +1224,7 @@ def main():
     fn = get_subcommand(subcommand)
 
     # hack
-    if fn in (test, help):
+    if fn in (help, test, version):
         sys.exit(fn(*args))
 
     try:

tests/test_blurb.py

@@ -179,3 +179,12 @@ def test_extract_next_filename(news_entry, expected_path, fs):
 
     # Assert
     assert path == expected_path
+
+
+def test_version(capfd):
+    # Act
+    blurb.version()
+
+    # Assert
+    captured = capfd.readouterr()
+    assert captured.out.startswith("blurb version ")

tox.ini

@@ -19,5 +19,7 @@ commands =
       {posargs}
     blurb test
     blurb help
+    blurb --version
     {envpython} -I -m blurb test
     {envpython} -I -m blurb help
+    {envpython} -I -m blurb version