add debugpy-adapter entrypoint (#1870)

Author: TheJJ

setup.py

@@ -196,6 +196,11 @@ def tail_is(*suffixes):
         has_ext_modules=lambda: True,
         cmdclass=cmds,
         # allow the user to call "debugpy" instead of "python -m debugpy"
-        entry_points={"console_scripts": ["debugpy = debugpy.server.cli:main"]},
+        entry_points={
+            "console_scripts": [
+                "debugpy = debugpy.server.cli:main",
+                "debugpy-adapter = debugpy.adapter.__main__:main",
+            ],
+        },
         **extras
     )

src/debugpy/adapter/__main__.py

@@ -13,7 +13,9 @@
 # and should be imported locally inside main() instead.
 
 
-def main(args):
+def main():
+    args = _parse_argv(sys.argv)
+
     # If we're talking DAP over stdio, stderr is not guaranteed to be read from,
     # so disable it to avoid the pipe filling and locking up. This must be done
     # as early as possible, before the logging module starts writing to it.
@@ -230,4 +232,4 @@ def _parse_argv(argv):
         # the default "C" locale if so.
         pass
 
-    main(_parse_argv(sys.argv))
+    main()