Enable single-line annotations with pip-compile --annotation-style=line

piptools/scripts/compile.py

@@ -123,6 +123,12 @@ def _get_default_option(option_name: str) -> Any:
     default=True,
     help="Annotate results, indicating where dependencies come from",
 )
+@click.option(
+    "--annotation-style",
+    type=click.Choice(("line", "split")),
+    default="split",
+    help="Choose the format of annotation comments",
+)
 @click.option(
     "-U",
     "--upgrade/--no-upgrade",
@@ -244,6 +250,7 @@ def cli(
     header: bool,
     emit_trusted_host: bool,
     annotate: bool,
+    annotation_style: str,
     upgrade: bool,
     upgrade_packages: Tuple[str, ...],
     output_file: Union[LazyFile, IO[Any], None],
@@ -471,6 +478,7 @@ def cli(
         emit_index_url=emit_index_url,
         emit_trusted_host=emit_trusted_host,
         annotate=annotate,
+        annotation_style=annotation_style,
         strip_extras=strip_extras,
         generate_hashes=generate_hashes,
         default_index_url=repository.DEFAULT_INDEX_URL,

piptools/writer.py

@@ -51,6 +51,23 @@ def _comes_from_as_string(ireq: InstallRequirement) -> str:
     return key_from_ireq(ireq.comes_from)
 
 
+def annotation_style_split(required_by: Set[str]) -> str:
+    sorted_required_by = sorted(required_by)
+    if len(sorted_required_by) == 1:
+        source = sorted_required_by[0]
+        annotation = "# via " + source
+    else:
+        annotation_lines = ["# via"]
+        for source in sorted_required_by:
+            annotation_lines.append("    #   " + source)
+        annotation = "\n".join(annotation_lines)
+    return annotation
+
+
+def annotation_style_line(required_by: Set[str]) -> str:
+    return f"# via {', '.join(sorted(required_by))}"
+
+
 class OutputWriter:
     def __init__(
         self,
@@ -61,6 +78,7 @@ def __init__(
         emit_index_url: bool,
         emit_trusted_host: bool,
         annotate: bool,
+        annotation_style: str,
         strip_extras: bool,
         generate_hashes: bool,
         default_index_url: str,
@@ -79,6 +97,7 @@ def __init__(
         self.emit_index_url = emit_index_url
         self.emit_trusted_host = emit_trusted_host
         self.annotate = annotate
+        self.annotation_style = annotation_style
         self.strip_extras = strip_extras
         self.generate_hashes = generate_hashes
         self.default_index_url = default_index_url
@@ -258,15 +277,16 @@ def _format_requirement(
             required_by.add(_comes_from_as_string(ireq))
 
         if required_by:
-            sorted_required_by = sorted(required_by)
-            if len(sorted_required_by) == 1:
-                source = sorted_required_by[0]
-                annotation = "    # via " + source
-            else:
-                annotation_lines = ["    # via"]
-                for source in sorted_required_by:
-                    annotation_lines.append("    #   " + source)
-                annotation = "\n".join(annotation_lines)
-            line = f"{line}\n{comment(annotation)}"
+            if self.annotation_style == "split":
+                annotation = annotation_style_split(required_by)
+                sep = "\n    "
+            elif self.annotation_style == "line":
+                annotation = annotation_style_line(required_by)
+                sep = "\n    " if ireq_hashes else "  "
+            else:  # pragma: no cover
+                raise ValueError("Invalid value for annotation style")
+            # 24 is one reasonable column size to use here, that we've used in the past
+            lines = f"{line:24}{sep}{comment(annotation)}".splitlines()
+            line = "\n".join(ln.rstrip() for ln in lines)
 
         return line

tests/test_cli_compile.py

@@ -891,7 +891,7 @@ def test_generate_hashes_with_annotations(runner):
 
 
 @pytest.mark.network
-def test_generate_hashes_with_long_annotations(runner):
+def test_generate_hashes_with_split_style_annotations(runner):
     with open("requirements.in", "w") as fp:
         fp.write("Django==1.11.29\n")
         fp.write("django-debug-toolbar==1.11\n")
@@ -900,7 +900,7 @@ def test_generate_hashes_with_long_annotations(runner):
         fp.write("pytz==2020.4\n")
         fp.write("sqlparse==0.3.1\n")
 
-    out = runner.invoke(cli, ["--generate-hashes"])
+    out = runner.invoke(cli, ["--generate-hashes", "--annotation-style", "split"])
     assert out.stderr == dedent(
         f"""\
         #
@@ -946,6 +946,54 @@ def test_generate_hashes_with_long_annotations(runner):
     )
 
 
+@pytest.mark.network
+def test_generate_hashes_with_line_style_annotations(runner):
+    with open("requirements.in", "w") as fp:
+        fp.write("Django==1.11.29\n")
+        fp.write("django-debug-toolbar==1.11\n")
+        fp.write("django-storages==1.9.1\n")
+        fp.write("django-taggit==0.24.0\n")
+        fp.write("pytz==2020.4\n")
+        fp.write("sqlparse==0.3.1\n")
+
+    out = runner.invoke(cli, ["--generate-hashes", "--annotation-style", "line"])
+    assert out.stderr == dedent(
+        f"""\
+        #
+        # This file is autogenerated by pip-compile with python \
+{sys.version_info.major}.{sys.version_info.minor}
+        # To update, run:
+        #
+        #    pip-compile --annotation-style=line --generate-hashes
+        #
+        django==1.11.29 \\
+            --hash=sha256:014e3392058d94f40569206a24523ce254d55ad2f9f46c6550b0fe2e4f94cf3f \\
+            --hash=sha256:4200aefb6678019a0acf0005cd14cfce3a5e6b9b90d06145fcdd2e474ad4329c
+            # via -r requirements.in, django-debug-toolbar, django-storages, django-taggit
+        django-debug-toolbar==1.11 \\
+            --hash=sha256:89d75b60c65db363fb24688d977e5fbf0e73386c67acf562d278402a10fc3736 \\
+            --hash=sha256:c2b0134119a624f4ac9398b44f8e28a01c7686ac350a12a74793f3dd57a9eea0
+            # via -r requirements.in
+        django-storages==1.9.1 \\
+            --hash=sha256:3103991c2ee8cef8a2ff096709973ffe7106183d211a79f22cf855f33533d924 \\
+            --hash=sha256:a59e9923cbce7068792f75344ed7727021ee4ac20f227cf17297d0d03d141e91
+            # via -r requirements.in
+        django-taggit==0.24.0 \\
+            --hash=sha256:710b4d15ec1996550cc68a0abbc41903ca7d832540e52b1336e6858737e410d8 \\
+            --hash=sha256:bb8f27684814cd1414b2af75b857b5e26a40912631904038a7ecacd2bfafc3ac
+            # via -r requirements.in
+        pytz==2020.4 \\
+            --hash=sha256:3e6b7dd2d1e0a59084bcee14a17af60c5c562cdc16d828e8eba2e683d3a7e268 \\
+            --hash=sha256:5c55e189b682d420be27c6995ba6edce0c0a77dd67bfbe2ae6607134d5851ffd
+            # via -r requirements.in, django
+        sqlparse==0.3.1 \\
+            --hash=sha256:022fb9c87b524d1f7862b3037e541f68597a730a8843245c349fc93e1643dc4e \\
+            --hash=sha256:e162203737712307dfe78860cc56c8da8a852ab2ee33750e33aeadf38d12c548
+            # via -r requirements.in, django-debug-toolbar
+        """
+    )
+
+
 def test_filter_pip_markers(pip_conf, runner):
     """
     Check that pip-compile works with pip environment markers (PEP496)
@@ -1078,10 +1126,10 @@ def test_multiple_input_files_without_output_file(runner):
 
 
 @pytest.mark.parametrize(
-    ("option", "expected"),
+    ("options", "expected"),
     (
         pytest.param(
-            "--annotate",
+            ("--annotate",),
             f"""\
             #
             # This file is autogenerated by pip-compile with python \
@@ -1101,7 +1149,23 @@ def test_multiple_input_files_without_output_file(runner):
             id="annotate",
         ),
         pytest.param(
-            "--no-annotate",
+            ("--annotate", "--annotation-style", "line"),
+            f"""\
+            #
+            # This file is autogenerated by pip-compile with python \
+{sys.version_info.major}.{sys.version_info.minor}
+            # To update, run:
+            #
+            #    pip-compile --annotation-style=line --no-emit-find-links
+            #
+            small-fake-a==0.1         # via -c constraints.txt, small-fake-with-deps
+            small-fake-with-deps==0.1  # via -r requirements.in
+            Dry-run, so nothing updated.
+            """,
+            id="annotate line style",
+        ),
+        pytest.param(
+            ("--no-annotate",),
             f"""\
             #
             # This file is autogenerated by pip-compile with python \
@@ -1118,17 +1182,17 @@ def test_multiple_input_files_without_output_file(runner):
         ),
     ),
 )
-def test_annotate_option(pip_conf, runner, option, expected):
+def test_annotate_option(pip_conf, runner, options, expected):
     """
-    The output lines has have annotations if option is turned on.
+    The output lines have annotations if the option is turned on.
     """
     with open("constraints.txt", "w") as constraints_in:
         constraints_in.write("small-fake-a==0.1")
     with open("requirements.in", "w") as req_in:
         req_in.write("-c constraints.txt\n")
         req_in.write("small_fake_with_deps")
 
-    out = runner.invoke(cli, [option, "-n", "--no-emit-find-links"])
+    out = runner.invoke(cli, [*options, "-n", "--no-emit-find-links"])
 
     assert out.stderr == dedent(expected)
     assert out.exit_code == 0

tests/test_writer.py

@@ -36,6 +36,7 @@ def writer(tmpdir_cwd):
             emit_index_url=True,
             emit_trusted_host=True,
             annotate=True,
+            annotation_style="split",
             generate_hashes=False,
             default_index_url=None,
             index_urls=[],
@@ -57,37 +58,37 @@ def test_format_requirement_annotation_editable(from_editable, writer):
 
     assert writer._format_requirement(
         ireq
-    ) == "-e git+git://fake.org/x/y.git#egg=y\n" + comment("    # via xyz")
+    ) == "-e git+git://fake.org/x/y.git#egg=y\n    " + comment("# via xyz")
 
 
 def test_format_requirement_annotation(from_line, writer):
     ireq = from_line("test==1.2")
     ireq.comes_from = "xyz"
 
-    assert writer._format_requirement(ireq) == "test==1.2\n" + comment("    # via xyz")
+    assert writer._format_requirement(ireq) == "test==1.2\n    " + comment("# via xyz")
 
 
 def test_format_requirement_annotation_lower_case(from_line, writer):
     ireq = from_line("Test==1.2")
     ireq.comes_from = "xyz"
 
-    assert writer._format_requirement(ireq) == "test==1.2\n" + comment("    # via xyz")
+    assert writer._format_requirement(ireq) == "test==1.2\n    " + comment("# via xyz")
 
 
 def test_format_requirement_for_primary(from_line, writer):
     "Primary packages should get annotated."
     ireq = from_line("test==1.2")
     ireq.comes_from = "xyz"
 
-    assert writer._format_requirement(ireq) == "test==1.2\n" + comment("    # via xyz")
+    assert writer._format_requirement(ireq) == "test==1.2\n    " + comment("# via xyz")
 
 
 def test_format_requirement_for_primary_lower_case(from_line, writer):
     "Primary packages should get annotated."
     ireq = from_line("Test==1.2")
     ireq.comes_from = "xyz"
 
-    assert writer._format_requirement(ireq) == "test==1.2\n" + comment("    # via xyz")
+    assert writer._format_requirement(ireq) == "test==1.2\n    " + comment("# via xyz")
 
 
 def test_format_requirement_environment_marker(from_line, writer):