Add checks for file existing properly

src/bioversions/resources/__init__.py

@@ -18,6 +18,7 @@
 VERSIONS_PATH = HERE.joinpath(HERE, "versions.json")
 
 ROOT = HERE.parent.parent.parent.resolve()
+PYPROJECT_TOML_PATH = ROOT.joinpath("pyproject.toml")
 DOCS = ROOT.joinpath("docs")
 EXPORTS_DIRECTORY = DOCS.joinpath("_data")
 EXPORT_PATH = EXPORTS_DIRECTORY.joinpath("versions.yml")
@@ -26,6 +27,11 @@
 
 def load_versions():
     """Load Bioversions data."""
+    if not VERSIONS_PATH.is_file():
+        raise RuntimeError(
+            f"bioversions was not packaged/built/installed properly -"
+            f"{VERSIONS_PATH.name} was not found inside the distribution"
+        )
     with open(VERSIONS_PATH) as file:
         return json.load(file)
 
@@ -35,13 +41,20 @@ def _date_converter(o):
         return o.strftime("%Y-%m-%d")
 
 
-def write_versions(versions, indent: int = 2, **kwargs):
+def write_versions(versions, indent: int = 2, **kwargs) -> None:
     """Write Bioversions data."""
+    _ensure_editable()
     with open(VERSIONS_PATH, "w") as file:
         json.dump(versions, file, indent=indent, default=_date_converter, **kwargs)
 
 
-def write_export(versions):
+def write_export(versions) -> None:
     """Write Bioversions data to the export directory."""
+    _ensure_editable()
     with open(EXPORT_PATH, "w") as file:
         yaml.safe_dump(versions, file)
+
+
+def _ensure_editable() -> None:
+    if not PYPROJECT_TOML_PATH.is_file():
+        raise RuntimeError("can not make export when bioversions is not installed in editable mode")