airfoil: Allow unpickling pyoptsparse if pyoptsparse is not available

engibench/problems/airfoil/fake_pyoptsparse/__init__.py

@@ -0,0 +1,36 @@
+"""Drop-in module for pyoptsparse to unpickle ahistory when pyoptsparse is not installed."""
+
+from types import ModuleType
+
+
+class FakePyOptSparseObject:
+    """Drop-in for objects needed to unpickle a pyoptsparse history when pyoptsparse is not installed."""
+
+    def __init__(self, *args, **kwargs) -> None:
+        self.args = args
+        self.kwargs = kwargs
+
+    def _mapContoOpt_Dict(self, d):  # noqa: N802
+        return d
+
+    def _mapXtoOpt_Dict(self, d):  # noqa: N802
+        return d
+
+    def _mapObjtoOpt_Dict(self, d):  # noqa: N802
+        return d
+
+
+class Optimization(FakePyOptSparseObject):
+    """Drop-in."""
+
+
+class Variable(FakePyOptSparseObject):
+    """Drop-in."""
+
+
+class Constraint(FakePyOptSparseObject):
+    """Drop-in."""
+
+
+class Objective(FakePyOptSparseObject):
+    """Drop-in."""

engibench/problems/airfoil/fake_pyoptsparse/pyOpt_constraint.py

@@ -0,0 +1,6 @@
+# noqa: N999
+"""Drop-in."""
+
+from engibench.problems.airfoil.fake_pyoptsparse import FakePyOptSparseObject as Constraint
+
+__all__ = ["Constraint"]

engibench/problems/airfoil/fake_pyoptsparse/pyOpt_objective.py

@@ -0,0 +1,6 @@
+# noqa: N999
+"""Drop-in."""
+
+from engibench.problems.airfoil.fake_pyoptsparse import FakePyOptSparseObject as Objective
+
+__all__ = ["Objective"]

engibench/problems/airfoil/fake_pyoptsparse/pyOpt_optimization.py

@@ -0,0 +1,6 @@
+# noqa: N999
+"""Drop-in."""
+
+from engibench.problems.airfoil.fake_pyoptsparse import FakePyOptSparseObject as Optimization
+
+__all__ = ["Optimization"]

engibench/problems/airfoil/fake_pyoptsparse/pyOpt_variable.py

@@ -0,0 +1,6 @@
+# noqa: N999
+"""Drop-in."""
+
+from engibench.problems.airfoil.fake_pyoptsparse import FakePyOptSparseObject as Variable
+
+__all__ = ["Variable"]

engibench/problems/airfoil/v0.py

@@ -18,8 +18,10 @@
 import dataclasses
 from dataclasses import dataclass
 from dataclasses import field
+import importlib
 import os
 import shutil
+import sys
 from typing import Annotated, Any
 
 from gymnasium import spaces
@@ -44,6 +46,12 @@
 from engibench.utils.files import clone_dir
 from engibench.utils.files import replace_template_values
 
+# Allow loading pyoptsparse histories even if pyoptsparse is not installed:
+if importlib.util.find_spec("pyoptsparse") is None:
+    from engibench.problems.airfoil import fake_pyoptsparse
+
+    sys.modules["pyoptsparse"] = fake_pyoptsparse
+
 DesignType = dict[str, Any]