.gitignore

@@ -7,3 +7,6 @@ result
 # Python
 __pycache__
 *.py[cod]
+
+# Model build output
+/build

nhf/build.py

@@ -0,0 +1,81 @@
+"""
+The NHF build system
+
+Usage: For any parametric assembly, inherit the `Model` class, and mark the
+output objects with the `@target` decorator
+"""
+from pathlib import Path
+from typing import Union
+import cadquery as Cq
+from colorama import Fore, Style
+
+class Target:
+
+    def __init__(self,
+                 method,
+                 name: str):
+        self._method = method
+        self.name = name
+    def __call__(self, obj, *args, **kwargs):
+        return self._method(obj, *args, **kwargs)
+
+    @classmethod
+    def methods(cls, subject):
+        """
+        List of all methods of a class or objects annotated with this decorator.
+        """
+        def g():
+            for name in dir(subject):
+                method = getattr(subject, name)
+                if isinstance(method, Target):
+                    yield name, method
+        return {name: method for name, method in g()}
+
+
+def target(name, **kwargs):
+    """
+    Decorator for annotating a build output
+    """
+    def f(method):
+        return Target(method, name=name, **kwargs)
+    return f
+
+def _to_shape(x: Union[Cq.Workplane, Cq.Shape, Cq.Compound, Cq.Assembly]) -> Cq.Shape:
+    if isinstance(x, Cq.Workplane):
+        x = x.val()
+    if isinstance(x, Cq.Assembly):
+        x = x.toCompound()
+    return x
+
+
+class Model:
+    """
+    Base class for a parametric assembly
+    """
+
+    def target_names(self) -> list[str]:
+        """
+        List of decorated target functions
+        """
+        return list(Target.methods(self).keys())
+
+    def build_all(self, output_dir: Union[Path, str] ="build", verbose=1):
+        """
+        Build all targets in this model
+        """
+        output_dir = Path(output_dir)
+        output_dir.mkdir(exist_ok=True, parents=True)
+        for k, f in Target.methods(self).items():
+            output_file = output_dir / f"{k}.stl"
+            if output_file.is_file():
+                if verbose >= 1:
+                    print(f"{Fore.GREEN}Skipping{Style.RESET_ALL} {output_file}")
+                continue
+
+            model = f(self)
+            if verbose >= 1:
+                print(f"{Fore.BLUE}Building{Style.RESET_ALL} {output_file}", end="")
+            _to_shape(model).exportStl(str(output_file))
+            if verbose >= 1:
+                print("\r", end="")
+                print(f"{Fore.GREEN}Built{Style.RESET_ALL} {output_file}")

nhf/touhou/houjuu_nue/__init__.py

@@ -1,4 +1,9 @@
 """
+To build, execute
+```
+python3 nhf/touhou/houjuu_nue/__init__.py
+```
+
 This cosplay consists of 3 components:
 
 ## Trident
@@ -32,11 +37,12 @@ import nhf.handle
 from nhf import Material
 from nhf.joints import HirthJoint
 from nhf.handle import Handle
+from nhf.build import Model, target
 import nhf.touhou.houjuu_nue.wing as MW
 import nhf.touhou.houjuu_nue.trident as MT
 
 @dataclass
-class Parameters:
+class Parameters(Model):
     """
     Defines dimensions for the Houjuu Nue cosplay
     """
@@ -179,6 +185,7 @@ class Parameters:
             (-dx, dx),
         ]
 
+    @target(name="hs_joint_parent")
     def hs_joint_parent(self):
         """
         Parent part of the Houjuu-Scarlett joint, which is composed of a Hirth
@@ -322,3 +329,8 @@ class Parameters:
 
     def trident_assembly(self):
         return MT.trident_assembly(self.trident_handle)
+
+
+if __name__ == '__main__':
+    p = Parameters()
+    p.build_all()

poetry.lock

@@ -857,4 +857,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10"
-content-hash = "caf46b526858dbf2960b0204782140ad072d96f7b3f161ac7e9db0d9b709b25a"
+content-hash = "ec47ccffd60fbda610a5c3725fc064a08b1b794f23084672bd62beb20b1b19f7"

pyproject.toml

@@ -10,6 +10,7 @@ python = "^3.10"
 cadquery = "^2.4.0"
 build123d = "^0.5.0"
 numpy = "^1.26.4"
+colorama = "^0.4.6"
 
 [build-system]
 requires = ["poetry-core"]