Add to_dict and to_file API to SiteConfig

omicron/ssg/config.py

@@ -99,3 +99,16 @@ class SiteConfig:
             items_per_page=items_per_page,
             template=template,
         )
+
+    def to_dict(self) -> dict[str, str | int]:
+        return {
+            "name": self.name,
+            "template": self.template,
+            "items_per_page": self.items_per_page,
+            "base_url": f"{self.origin}{self.base_dir}",
+        }
+
+    def to_file(self, path: Path) -> None:
+        log.debug("Writing config file %s", path)
+        with open(path, "w") as f:
+            yaml.safe_dump(self.to_dict(), f, default_flow_style=False)

tests/unit/test_config.py

@@ -58,6 +58,48 @@ def test_from_dict_full():
     assert config.base_dir == Path("/blog")
 
 
+def test_to_dict():
+    config = SiteConfig(
+        name="My Site",
+        origin="http://example.com",
+        base_dir=Path("/blog"),
+        items_per_page=42,
+        template="plain",
+    )
+
+    assert config.to_dict() == {
+        "name": "My Site",
+        "template": "plain",
+        "items_per_page": 42,
+        "base_url": "http://example.com/blog",
+    }
+
+
+def test_to_dict_default_base_url():
+    config = SiteConfig(
+        name="My Site",
+        origin="",
+        base_dir=Path("/"),
+        items_per_page=DEFAULT_ITEMS_PER_PAGE,
+        template="plain",
+    )
+
+    assert config.to_dict()["base_url"] == "/"
+
+
+def test_to_dict_round_trip():
+    original = SiteConfig.from_dict(
+        {
+            "name": "My Site",
+            "template": "plain",
+            "base_url": "http://example.com/blog",
+            "items_per_page": 42,
+        }
+    )
+
+    assert SiteConfig.from_dict(original.to_dict()) == original
+
+
 MISSING = object()
 
 
@@ -128,6 +170,21 @@ def test_from_file_full(tmp_path):
     assert config.base_dir == Path("/blog")
 
 
+def test_to_file(tmp_path):
+    path = tmp_path / "config.yml"
+    config = SiteConfig(
+        name="My Site",
+        origin="http://example.com",
+        base_dir=Path("/blog"),
+        items_per_page=42,
+        template="plain",
+    )
+
+    config.to_file(path)
+
+    assert SiteConfig.from_file(path) == config
+
+
 def test_from_file_missing(tmp_path):
     path = tmp_path / "config.yml"