refactor: append all env related func to evnvironment.py

environment.py

@@ -0,0 +1,44 @@
+import sys
+import subprocess
+import os
+from pathlib import Path
+import bpy
+
+thirdPartyDir = os.path.dirname(os.path.abspath(__file__))+"/libs"
+python_path = Path(bpy.app.binary_path_python)
+cwd_for_subprocesses = python_path.parent
+target = None
+
+def module_can_be_imported(name):
+    try:
+        __import__(name)
+        return True
+    except ModuleNotFoundError:
+        return False
+
+
+def get_package_install_directory():
+    for path in sys.path:
+        if os.path.basename(path) in ("dist-packages", "site-packages"):
+            return path
+
+
+def install_pip():
+    # pip can not necessarily be imported into Blender after this
+    get_pip_path = Path(__file__).parent / "libs" / "get-pip.py"
+    subprocess.run([str(python_path), str(get_pip_path)], cwd=cwd_for_subprocesses)
+
+
+def install_package(name):
+    target = get_package_install_directory()
+    
+    subprocess.run([str(python_path), "-m", "pip", "install",
+                        name, '--target', target], cwd=cwd_for_subprocesses)
+
+def setup(dependencies):
+    if not module_can_be_imported("pip"):
+        install_pip()
+
+    for dep in dependencies:
+        if not module_can_be_imported(dep):
+            install_package(dep)