PEP 440 Direct Reference support

piptools/utils.py

@@ -115,7 +115,16 @@ def format_requirement(
     if ireq.editable:
         line = f"-e {ireq.link.url}"
     elif is_url_requirement(ireq):
-        line = ireq.link.url
+        if not ireq.name:
+            line = ireq.link.url
+        elif ireq.link.url.startswith("file:./"):
+            # file:./ is a hack to use a relative path to a package
+            # Direct reference does not work for this, so only the URL is used
+            line = ireq.link.url
+        elif "#" in ireq.link.url and "egg=" in ireq.link.url.rsplit("#", 1)[1]:
+            line = ireq.link.url
+        else:
+            line = f"{ireq.name.lower()} @ {ireq.link.url}"
     else:
         line = str(ireq.req).lower()
 

tests/test_cli_compile.py

@@ -47,19 +47,19 @@ def test_command_line_overrides_pip_conf(pip_with_index_conf, runner):
         pytest.param("small-fake-a==0.1", "small-fake-a==0.1", id="regular"),
         pytest.param(
             "pip-tools @ https://github.com/jazzband/pip-tools/archive/7d86c8d3.zip",
-            "https://github.com/jazzband/pip-tools/archive/7d86c8d3.zip",
+            "pip-tools @ https://github.com/jazzband/pip-tools/archive/7d86c8d3.zip",
             id="zip URL",
         ),
         pytest.param(
             "pip-tools @ git+https://github.com/jazzband/pip-tools@7d86c8d3",
-            "git+https://github.com/jazzband/pip-tools@7d86c8d3",
+            "pip-tools @ git+https://github.com/jazzband/pip-tools@7d86c8d3",
             id="scm URL",
         ),
         pytest.param(
             "pip-tools @ https://files.pythonhosted.org/packages/06/96/"
             "89872db07ae70770fba97205b0737c17ef013d0d1c790"
             "899c16bb8bac419/pip_tools-3.6.1-py2.py3-none-any.whl",
-            "https://files.pythonhosted.org/packages/06/96/"
+            "pip-tools @ https://files.pythonhosted.org/packages/06/96/"
             "89872db07ae70770fba97205b0737c17ef013d0d1c790"
             "899c16bb8bac419/pip_tools-3.6.1-py2.py3-none-any.whl",
             id="wheel URL",

tests/test_data/packages/fake_with_deps/setup.py

@@ -18,5 +18,6 @@
         "SQLAlchemy!=0.9.5,<2.0.0,>=0.7.8,>=1.0.0",
         "python-memcached>=1.57,<2.0",
         "xmltodict<=0.11,>=0.4.6",
+        "requests @ git+git://github.com/psf/requests@v2.25.1",
     ],
 )

tests/test_utils.py

@@ -32,9 +32,44 @@ def test_format_requirement(from_line):
     assert format_requirement(ireq) == "test==1.2"
 
 
-def test_format_requirement_url(from_line):
-    ireq = from_line("https://example.com/example.zip")
-    assert format_requirement(ireq) == "https://example.com/example.zip"
+@pytest.mark.parametrize(
+    ("line", "expected"),
+    (
+        pytest.param(
+            "https://example.com/example.zip",
+            "https://example.com/example.zip",
+            id="simple url",
+        ),
+        pytest.param(
+            "example @ https://example.com/example.zip",
+            "example @ https://example.com/example.zip",
+            id="direct reference",
+        ),
+        pytest.param(
+            "Example @ https://example.com/example.zip",
+            "example @ https://example.com/example.zip",
+            id="direct reference lower case",
+        ),
+        pytest.param(
+            "https://example.com/example.zip#egg=example",
+            "https://example.com/example.zip#egg=example",
+            id="url with egg",
+        ),
+        pytest.param(
+            "example @ https://example.com/example.zip?egg=test#subdirectory=project_a",
+            "example @ https://example.com/example.zip?egg=test#subdirectory=project_a",
+            id="egg as query",
+        ),
+        pytest.param(
+            "file:./vendor/package.zip#egg=example",
+            "file:./vendor/package.zip#egg=example",
+            id="relative path",
+        ),
+    ),
+)
+def test_format_requirement_url(from_line, line, expected):
+    ireq = from_line(line)
+    assert format_requirement(ireq) == expected
 
 
 def test_format_requirement_editable_vcs(from_editable):