lib.FileContext: Add URI manipulation methods

Add .schema_from_uri(), .split_uri(), .id() to define some
standardish way to dissect an URI the same way FileContext does.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/FileContext.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import abc, re
 from typing import TYPE_CHECKING
+from functools import cached_property, cache
 
 if TYPE_CHECKING:
     from typing import Self
@@ -26,6 +27,24 @@ class FileContext(abc.ABC):
     async def __aexit__(self, exc_type, exc, tb):
         await self.close()
 
+    @classmethod
+    def schema_from_uri(cls, uri: str) -> str:
+        tokens = re.split(r'://', uri)
+        return tokens[0] if tokens[0] != uri else 'file'
+
+    @classmethod
+    @cache
+    def split_uri(cls, uri: str) -> tuple[str, str]:
+        from urllib.parse import urlparse
+        p = urlparse(uri)
+        netloc = p.netloc if p.netloc else ''
+        return f'{cls.schema_from_uri(uri)}://{netloc}', p.path
+
+    @cached_property
+    def id(self) -> str:
+        id, path = self.split_uri(self.__uri)
+        return id
+
     @property
     def uri(self) -> str:
         return self.__uri
@@ -196,9 +215,7 @@ class FileContext(abc.ABC):
 
     @classmethod
     def create(cls, uri: str, *args, **kwargs) -> Self:
-        tokens = re.split(r'://', uri)
+        match cls.schema_from_uri(uri):
-        schema = tokens[0] if tokens[0] != uri else 'file'
-        match schema:
             case 'local' | 'file':
                 from .ec.Local import Local
                 return Local(uri, *args, **kwargs)
@@ -210,4 +227,4 @@ class FileContext(abc.ABC):
                 return Curl(uri, *args, **kwargs)
             case _:
                 pass
-        raise Exception(f'Can\'t create file transfer instance for {uri} with unknown schema "{schema}"')
+        raise Exception(f'Can\'t create file transfer instance for {uri} with unknown schema "{cls.schema_from_uri(uri)}"')