Fix relative file url repr

CHANGES/648.bugfix.rst

@@ -0,0 +1 @@
+Fix relative file url representation.

tests/test_url.py

@@ -52,6 +52,13 @@ def test_str():
     assert str(url) == "http://example.com:8888/path/to?a=1&b=2"
 
 
+def test_str_relative_file():
+    url1 = URL("file:foo/bar")
+    assert str(url1) == "file:foo/bar"
+    url2 = URL("file:///foo/bar")
+    assert str(url2) == "file:///foo/bar"
+
+
 def test_repr():
     url = URL("http://example.com")
     assert "URL('http://example.com')" == repr(url)
@@ -1546,6 +1553,16 @@ def test_human_repr_non_printable():
     )
 
 
+def test_human_repr_file():
+    url = URL.build(
+        scheme="file",
+        path="foo/bar",
+    )
+    s = url.human_repr()
+    assert URL(s) == url
+    assert s == "file:foo/bar"
+
+
 # relative
 
 

yarl/_url.py

@@ -263,7 +263,7 @@ def __str__(self):
         val = self._val
         if not val.path and self.is_absolute() and (val.query or val.fragment):
             val = val._replace(path="/")
-        return urlunsplit(val)
+        return _urlunsplit(val)
 
     def __repr__(self):
         return f"{self.__class__.__name__}('{str(self)}')"
@@ -1090,7 +1090,7 @@ def human_repr(self):
             for k, v in self.query.items()
         )
         fragment = _human_quote(self.fragment, "")
-        return urlunsplit(
+        return _urlunsplit(
             SplitResult(
                 self.scheme,
                 self._make_netloc(
@@ -1107,6 +1107,13 @@ def human_repr(self):
         )
 
 
+def _urlunsplit(s):
+    url = urlunsplit(s)
+    if s.scheme == "file" and not s.path.startswith("/"):
+        url = url.replace("///", "")
+    return url
+
+
 def _human_quote(s, unsafe):
     if not s:
         return s