[devscripts] Provide pyinstaller hooks

Closes #6185

yt_dlp/__pyinstaller/__init__.py

@@ -0,0 +1,5 @@
+import os
+
+
+def get_hook_dirs():
+    return [os.path.dirname(__file__)]

yt_dlp/__pyinstaller/hook-yt_dlp.py

@@ -0,0 +1,29 @@
+import sys
+
+from PyInstaller.utils.hooks import collect_submodules
+
+
+def _pycryptodome_module():
+    try:
+        import Cryptodome  # noqa: F401
+    except ImportError:
+        try:
+            import Crypto  # noqa: F401
+            print('WARNING: Using Crypto since Cryptodome is not available. '
+                  'Install with: pip install pycryptodomex', file=sys.stderr)
+            return 'Crypto'
+        except ImportError:
+            pass
+    return 'Cryptodome'
+
+
+def _hidden_imports():
+    yield 'yt_dlp.compat._legacy'
+    for m in [_pycryptodome_module(), 'websockets']:
+        yield from collect_submodules(m)
+    # These are auto-detected, but explicitly add them just in case
+    yield from ('mutagen', 'brotli', 'certifi')
+
+
+hiddenimports = list(_hidden_imports())
+excludedimports = ['youtube_dl', 'youtube_dlc', 'test', 'ytdlp_plugins', 'devscripts']

yt_dlp/compat/__init__.py

@@ -70,9 +70,3 @@ if compat_os_name in ('nt', 'ce'):
         return userhome + path[i:]
 else:
     compat_expanduser = os.path.expanduser
-
-
-# NB: Add modules that are imported dynamically here so that PyInstaller can find them
-# See https://github.com/pyinstaller/pyinstaller-hooks-contrib/issues/438
-if False:
-    from . import _legacy  # noqa: F401