refactor(project): set up dynamic scripts location lookup

Removed custom logic for determining the scripts/ location, in favor of using
the virtualenv mechanism.

Fixes: #5978

Author: ByteB4rb1e

pipenv/project.py

@@ -69,6 +69,7 @@
     system_which,
 )
 from pipenv.utils.toml import cleanup_toml, convert_toml_outline_tables
+from pipenv.utils.virtualenv import virtualenv_scripts_dir
 from pipenv.vendor import plette, tomlkit
 
 try:
@@ -412,10 +413,11 @@ def is_venv_in_project(self) -> bool:
     def virtualenv_exists(self) -> bool:
         venv_path = Path(self.virtualenv_location)
         if venv_path.exists():
+
             if os.name == "nt":
-                activate_path = venv_path / "Scripts" / "activate.bat"
+                activate_path = self.scripts_dir / "activate.bat"
             else:
-                activate_path = venv_path / "bin" / "activate"
+                activate_path = self.scripts_dir / "activate"
             return activate_path.is_file()
 
         return False
@@ -612,6 +614,10 @@ def virtualenv_src_location(self) -> Path:
         loc.mkdir(parents=True, exist_ok=True)
         return loc
 
+    @property
+    def virtualenv_scripts_location(self) -> Path:
+        return virtualenv_scripts_dir(self.virtualenv.location)
+
     @property
     def download_location(self) -> Path:
         if self._download_location is None:
@@ -1422,10 +1428,9 @@ def proper_case_section(self, section):
     def finders(self):
         from .vendor.pythonfinder import Finder
 
-        scripts_dirname = "Scripts" if os.name == "nt" else "bin"
-        scripts_dir = Path(self.virtualenv_location) / scripts_dirname
         finders = [
-            Finder(path=str(scripts_dir), global_search=gs, system=False)
+            Finder(path=str(self.virtualenv_scripts_location), global_search=gs,
+                                                               system=False)
             for gs in (False, True)
         ]
         return finders
@@ -1463,12 +1468,14 @@ def _which(self, command, location=None, allow_global=False):
         is_python = command in ("python", Path(sys.executable).name, version_str)
 
         if not allow_global:
+            scripts_location = virtualenv_scripts_dir(location_path)
+
             if os.name == "nt":
-                p = find_windows_executable(str(location_path / "Scripts"), command)
+                p = find_windows_executable(str(scripts_location), command)
                 # Convert to Path object if it's a string
                 p = Path(p) if isinstance(p, str) else p
             else:
-                p = location_path / "bin" / command
+                p = scripts_location / command
         elif is_python:
             p = Path(sys.executable)
         else: