Set COMPRESS_OFFLINE when running the compress management command.

coltrane/__init__.py

@@ -380,6 +380,9 @@ def _merge_settings(base_dir: Path, django_settings: Dict[str, Any]) -> Dict[str
 
         default_settings["TEMPLATES"][0]["OPTIONS"]["builtins"].append("compressor.templatetags.compress")
 
+        if len(sys.argv) > 1 and sys.argv[1] == "compress":
+            default_settings["COMPRESS_OFFLINE"] = True
+
     # Make sure BASE_DIR is a `Path` if it got passed in
     if "BASE_DIR" in django_settings and isinstance(django_settings["BASE_DIR"], str):
         django_settings["BASE_DIR"] = Path(django_settings["BASE_DIR"])

tests/init/test_merge_settings.py

@@ -103,3 +103,15 @@ def test_merge_settings_with_django_compressor():
 
     assert "compressor.finders.CompressorFinder" in actual["STATICFILES_FINDERS"]
     assert "compressor.templatetags.compress" in actual["TEMPLATES"][0]["OPTIONS"]["builtins"]
+
+
+@patch("coltrane.is_whitenoise_installed", Mock(return_value=False))
+@patch("coltrane.is_django_compressor_installed", Mock(return_value=True))
+@patch("coltrane.is_django_unicorn_installed", Mock(return_value=False))
+@patch("coltrane.is_unicorn_module_available", Mock(return_value=False))
+@patch("sys.argv", ["app.py", "compress"])
+def test_merge_settings_with_django_compressor_compress_offline():
+    actual = _merge_settings(Path("."), {})
+
+    assert "COMPRESS_OFFLINE" in actual
+    assert actual["COMPRESS_OFFLINE"] is True