Add --version to entrypoint

sarkit_processing/__main__.py

@@ -1,6 +1,7 @@
 import argparse
 import sys
 
+import sarkit_processing
 import sarkit_processing._coords
 import sarkit_processing._sicd_chip
 import sarkit_processing.sicd_alias
@@ -9,6 +10,14 @@
 
 def main(args=None):
     parser = argparse.ArgumentParser(description="sarkit-processing tools")
+    parser.add_argument(
+        "-v",
+        "--version",
+        action="version",
+        version="sarkit-processing version {version}".format(
+            version=sarkit_processing.__version__
+        ),
+    )
     subcommands = parser.add_subparsers(
         title="subcommands", required=True, dest="command"
     )

tests/test_main.py

@@ -0,0 +1,28 @@
+import subprocess
+import sys
+
+import pytest
+
+import sarkit_processing
+
+
+def ep_callable(epname):
+    def func(args):
+        return subprocess.check_output([epname] + args, text=True)
+
+    return func
+
+
+def run_module(args):
+    return subprocess.check_output(
+        [sys.executable, "-m", "sarkit_processing"] + args, text=True
+    )
+
+
+@pytest.mark.parametrize(
+    "caller", [ep_callable("sarkit-processing"), ep_callable("skp"), run_module]
+)
+def test_main(caller):
+    out = caller(["--version"])
+    assert sarkit_processing.__version__ in out
+    assert "sarkit-processing" in out