PY-57566 Support PEP 660 editable installs.

GitOrigin-RevId: cca68d9504ae4f10a774cfbdd03c38f5176f88fd

python/helpers/syspath.py

@@ -4,8 +4,48 @@ import sys
 _helpers_root = os.path.dirname(os.path.abspath(__file__))
 _working_dir = os.getcwd()
 
-for root in sys.path:
-    # The current working dir is not automatically included but can be if PYTHONPATH
-    # contains an empty entry.
-    if root != _helpers_root and root != os.curdir and root != _working_dir:
-        print(root)
+
+def get_pep660_editable_roots_from_metadata():
+    try:
+        # importlib.metadata was added in 3.8
+        from importlib.metadata import distributions, Distribution
+    except ImportError:
+        return []
+
+    def read_from_direct_url_json(dist):
+        # type: (Distribution) -> str | None
+
+        import json
+        direct_url_file = dist._path / 'direct_url.json'
+        if direct_url_file.exists():
+            with direct_url_file.open() as f:
+                data = json.load(f)
+                if data.get('dir_info', {}).get('editable'):
+                    return data.get('url', '')
+        return None
+
+    editable_roots = []
+    for dist in distributions():
+        url = None  # type: str | None
+        try:
+            # 'origin' was added in Python 3.13
+            if dist.origin.dir_info.editable:
+                url = dist.origin.url
+        except AttributeError:
+            url = read_from_direct_url_json(dist)
+
+        FILE_PREFIX = "file://"
+        if url and url.startswith(FILE_PREFIX):
+            editable_roots.append(url[len(FILE_PREFIX):])
+    return editable_roots
+
+
+if __name__ == "__main__":
+    for root in sys.path:
+        # The current working dir is not automatically included but can be if PYTHONPATH
+        # contains an empty entry.
+        if root != _helpers_root and root != os.curdir and root != _working_dir:
+            print(root)
+
+    for editable_root in get_pep660_editable_roots_from_metadata():
+        print(editable_root)