Direct references show extra requirements in .txt files

piptools/utils.py

@@ -155,7 +155,9 @@ def _build_direct_reference_best_efforts(ireq: InstallRequirement) -> str:
 
  # If we get here then we have a requirement that supports direct reference.
  # We need to remove the egg if it exists and keep the rest of the fragments.
- direct_reference = f"{ireq.name.lower()} @ {ireq.link.url_without_fragment}"
+ lowered_ireq_name = canonicalize_name(ireq.name)
+ extras = f"[{','.join(sorted(ireq.extras))}]" if ireq.extras else ""
+ direct_reference = f"{lowered_ireq_name}{extras} @ {ireq.link.url_without_fragment}"
  fragments = []
 
  # Check if there is any fragment to add to the URI.

tests/test_cli_compile.py

@@ -779,7 +779,10 @@ def test_direct_reference_with_extras(runner):
  )
  out = runner.invoke(cli, ["-n", "--rebuild", "--no-build-isolation"])
  assert out.exit_code == 0
- assert "pip-tools @ git+https://github.com/jazzband/pip-tools@6.2.0" in out.stderr
+ assert (
+ "pip-tools[coverage,testing] @ git+https://github.com/jazzband/pip-tools@6.2.0"
+ in out.stderr
+ )
  assert "pytest==" in out.stderr
  assert "pytest-cov==" in out.stderr
 
@@ -2955,7 +2958,7 @@ def test_compile_recursive_extras(runner, tmp_path, current_resolver):
  os.fspath(tmp_path / "pyproject.toml"),
  ],
  )
- expected = rf"""foo @ {tmp_path.as_uri()}
+ expected = rf"""foo[footest] @ {tmp_path.as_uri()}
 small-fake-a==0.2
 small-fake-b==0.3
 """

tests/test_utils.py

@@ -79,6 +79,11 @@ def test_format_requirement(from_line):
  "example @ https://example.com/example.zip?egg=test",
  id="direct reference with egg in query",
  ),
+ pytest.param(
+ "example[b,c,a] @ https://example.com/example.zip",
+ "example[a,b,c] @ https://example.com/example.zip",
+ id="direct reference with optional dependency",
+ ),
  pytest.param(
  "file:./vendor/package.zip",
  "file:./vendor/package.zip",