🐛 allow pre-existing lockfiles

hatch_pip_compile/lock.py

@@ -16,7 +16,6 @@
 from piptools._compat.pip_compat import PipSession, parse_requirements
 
 from hatch_pip_compile.base import HatchPipCompileBase
-from hatch_pip_compile.exceptions import LockFileError
 
 logger = logging.getLogger(__name__)
 
@@ -87,7 +86,7 @@ def current_python_version(self) -> Version:
             raise NotImplementedError(msg)
 
     @property
-    def lock_file_version(self) -> Version:
+    def lock_file_version(self) -> Version | None:
         """
         Get lock file version
         """
@@ -96,8 +95,11 @@ def lock_file_version(self) -> Version:
             r"# This file is autogenerated by hatch-pip-compile with Python (.*)", lock_file_text
         )
         if match is None:
-            msg = "Could not find lock file python version"
-            raise LockFileError(msg)
+            logger.error(
+                "[hatch-pip-compile] Non hatch-pip-compile lock file detected (%s)",
+                self.environment.piptools_lock_file.name,
+            )
+            return None
         return Version(match.group(1))
 
     def compare_python_versions(self, verbose: bool | None = None) -> bool:
@@ -111,6 +113,8 @@ def compare_python_versions(self, verbose: bool | None = None) -> bool:
             which will print the warning. Used as a plugin flag.
         """
         lock_version = self.lock_file_version
+        if lock_version is None:
+            return False
         current_version = self.current_python_version
         match = (current_version.major == lock_version.major) and (
             current_version.minor == lock_version.minor