Generate __version__ at build to avoid slow importlib.metadata import

.gitignore

@@ -110,3 +110,6 @@ venv.bak/
 .mypy_cache/
 .dmypy.json
 dmypy.json
+
+# hatch-vcs
+src/norwegianblue/_version.py

pyproject.toml

@@ -64,6 +64,9 @@ norwegianblue = "norwegianblue.cli:main"
 [tool.hatch]
 version.source = "vcs"
 
+[tool.hatch.build.hooks.vcs]
+version-file = "src/norwegianblue/_version.py"
+
 [tool.hatch.version.raw-options]
 local_scheme = "no-local-version"
 

src/norwegianblue/__init__.py

@@ -6,23 +6,20 @@
 from __future__ import annotations
 
 import datetime as dt
-import importlib.metadata
 import json
 import logging
 from functools import lru_cache
 
 from dateutil.relativedelta import relativedelta
 from termcolor import colored
 
-from norwegianblue import _cache
-
-__version__ = importlib.metadata.version(__name__)
+from norwegianblue import _cache, _version
 
+__version__ = _version.__version__
 
 __all__ = ["__version__"]
 
 BASE_URL = "https://endoflife.date/api/"
-USER_AGENT = f"norwegianblue/{__version__}"
 
 
 def error_404_text(product: str, suggestion: str) -> str:
@@ -63,7 +60,11 @@ def norwegianblue(
         # No cache, or couldn't load cache
         import httpx
 
-        r = httpx.get(url, follow_redirects=True, headers={"User-Agent": USER_AGENT})
+        r = httpx.get(
+            url,
+            follow_redirects=True,
+            headers={"User-Agent": f"norwegianblue/{__version__}"},
+        )
 
         logging.info("HTTP status code: %d", r.status_code)
         if r.status_code == 404: