Added support for auto-installing

Working on my birthday... *sigh*

Anyway, Bpy-Build now supports automatically installing to specific
Blender versions, either through the install_versions tag or the -v
argument. Now Bpy-Build's basic functionality has been returned, yay...

Also happy birthday to me ^_^

bpy_addon_build/__init__.py

@@ -35,7 +35,7 @@ def main() -> None:
             return
         if "install_versions" in data and isinstance(data["install_versions"], List):
             versions = data["install_versions"]
-            if len(cli.versions):
+            if cli.versions:
                 versions = cli.versions
         else:
             print("install_versions must be list of floats!")

bpy_addon_build/args.py

@@ -34,15 +34,17 @@ def path_validate(self, _: Attribute, value: Path) -> None:
 
     @versions.validator
     def version_validate(self, _: Attribute, value: List[float]) -> None:
-        for ver in value:
-            if not isinstance(ver, float):
-                raise ValueError("Expected List of floating point values!")
+        if value:
+            for ver in value:
+                if not isinstance(ver, float):
+                    raise ValueError("Expected List of floating point values!")
 
     @actions.validator
     def actions_validate(self, _: Attribute, value: List[str]) -> None:
-        for act in value:
-            if not isinstance(act, str):
-                raise ValueError("Expect List of strings!")
+        if value:
+            for act in value:
+                if not isinstance(act, str):
+                    raise ValueError("Expect List of strings!")
 
 
 def parse_args() -> Args:

bpy_addon_build/build_context.py

@@ -3,6 +3,12 @@
 from typing import Dict, List
 from attrs import define, field, Attribute
 
+INSTALL_PATHS: List[str] = [
+    "~/AppData/Roaming/Blender Foundation/Blender/{0}/scripts/addons",
+    "~/Library/Application Support/Blender/{0}/scripts/addons",
+    "~/.config/blender/{0}/scripts/addons",
+]
+
 
 # Must be ignored to pass Mypy as this has
 # an expression of Any, likely due to how
@@ -130,6 +136,33 @@ def combine_with_build(path: Path) -> Path:
             for act in self.defined_actions:
                 self.action(act, STAGE_ONE.joinpath(ADDON_FOLDER.name))
         shutil.make_archive(str(combine_with_build(BUILD_DIR)), "zip", STAGE_ONE)
+        self.install(Path(str(combine_with_build(BUILD_DIR)) + ".zip"))
+
+    def install(self, build_path: Path) -> None:
+        """
+        Installs the addon to the specified Blender
+        versions
+
+        build_path: Path to the built addon
+
+        Returns:
+            None
+        """
+        for v in self.install_versions:
+            installed = False
+            for p in INSTALL_PATHS:
+                path = Path(p.format(str(v))).expanduser()
+                if not path.exists():
+                    continue
+                else:
+                    addon_path = path.joinpath(Path(self.build_name))
+                    if addon_path.exists():
+                        shutil.rmtree(addon_path)
+                    shutil.unpack_archive(build_path, path)
+                    print(f"Installed to {str(path)}")
+                    installed = True
+            if not installed:
+                print(f"Cound not find {v}")
 
     def action(self, action: str, folder: Path) -> None:
         """