Doc and info for dataFS (#1421)

Author: martindurant

fsspec/implementations/data.py

@@ -18,12 +18,22 @@ class DataFileSystem(AbstractFileSystem):
 
     protocol = "data"
 
+    def __init__(self, **kwargs):
+        """No parameters for this filesystem"""
+        super().__init__(**kwargs)
+
     def cat_file(self, path, start=None, end=None, **kwargs):
         pref, data = path.split(",", 1)
         if pref.endswith("base64"):
             return base64.b64decode(data)[start:end]
         return unquote(data).encode()[start:end]
 
+    def info(self, path, **kwargs):
+        pref, name = path.split(",", 1)
+        data = self.cat_file(path)
+        mime = pref.split(":", 1)[1].split(";", 1)[0]
+        return {"name": name, "size": len(data), "type": "file", "mimetype": mime}
+
     def _open(
         self,
         path,

fsspec/implementations/tests/test_data.py

@@ -7,3 +7,14 @@ def test_1():
 
     with fsspec.open("data:,Hello%2C%20World%21") as f:
         assert f.read() == b"Hello, World!"
+
+
+def test_info():
+    fs = fsspec.filesystem("data")
+    info = fs.info("data:text/html,%3Ch1%3EHello%2C%20World%21%3C%2Fh1%3E")
+    assert info == {
+        "name": "%3Ch1%3EHello%2C%20World%21%3C%2Fh1%3E",
+        "size": 22,
+        "type": "file",
+        "mimetype": "text/html",
+    }