Issue/1705/stream/skip failure

CHANGELOG.md

@@ -7,6 +7,7 @@ Find out more about isort's release policy [here](https://pycqa.github.io/isort/
 ### 5.9.0 TBD
   - Fixed (https://github.com/PyCQA/isort/pull/1695) added imports being added to doc string in some cases.
   - Implemented #1697: Provisional support for PEP 582: skip `__pypackages__` directories by default.
+  - Implemented #1705: More intuitive handling of isort:skip_file comments on streams.
 
 ### 5.8.0 March 20th 2021
   - Fixed #1631: as import comments can in some cases be duplicated.

isort/api.py

@@ -125,6 +125,7 @@ def sort_stream(
     file_path: Optional[Path] = None,
     disregard_skip: bool = False,
     show_diff: Union[bool, TextIO] = False,
+    raise_on_skip: bool = True,
     **config_kwargs,
 ) -> bool:
     """Sorts any imports within the provided code stream, outputs to the provided output stream.
@@ -150,6 +151,7 @@ def sort_stream(
             config=config,
             file_path=file_path,
             disregard_skip=disregard_skip,
+            raise_on_skip=raise_on_skip,
             **config_kwargs,
         )
         _output_stream.seek(0)
@@ -187,6 +189,7 @@ def sort_stream(
             _internal_output,
             extension=extension or (file_path and file_path.suffix.lstrip(".")) or "py",
             config=config,
+            raise_on_skip=raise_on_skip,
         )
     except FileSkipComment:
         raise FileSkipComment(content_source)

isort/core.py

@@ -30,6 +30,7 @@ def process(
     input_stream: TextIO,
     output_stream: TextIO,
     extension: str = "py",
+    raise_on_skip: bool = True,
     config: Config = DEFAULT_CONFIG,
 ) -> bool:
     """Parses stream identifying sections of contiguous imports and sorting them
@@ -61,6 +62,7 @@ def process(
     first_import_section: bool = True
     indent: str = ""
     isort_off: bool = False
+    skip_file: bool = False
     code_sorting: Union[bool, str] = False
     code_sorting_section: str = ""
     code_sorting_indent: str = ""
@@ -149,7 +151,10 @@ def process(
 
             for file_skip_comment in FILE_SKIP_COMMENTS:
                 if file_skip_comment in line:
-                    raise FileSkipComment("Passed in content")
+                    if raise_on_skip:
+                        raise FileSkipComment("Passed in content")
+                    isort_off = True
+                    skip_file = True
 
             if not in_quote and stripped_line == "# isort: off":
                 isort_off = True
@@ -195,7 +200,7 @@ def process(
             not_imports = bool(in_quote) or was_in_quote or in_top_comment or isort_off
             if not (in_quote or was_in_quote or in_top_comment):
                 if isort_off:
-                    if stripped_line == "# isort: on":
+                    if not skip_file and stripped_line == "# isort: on":
                         isort_off = False
                 elif stripped_line.endswith("# isort: split"):
                     not_imports = True

isort/exceptions.py

@@ -56,7 +56,7 @@ class FileSkipComment(FileSkipped):
 
     def __init__(self, file_path: str):
         super().__init__(
-            f"{file_path} contains an file skip comment and was skipped.", file_path=file_path
+            f"{file_path} contains a file skip comment and was skipped.", file_path=file_path
         )
 
 

isort/hooks.py

@@ -53,7 +53,6 @@ def git_hook(
 
     :return number of errors if in strict mode, 0 otherwise.
     """
-
     # Get list of files modified and staged
     diff_cmd = ["git", "diff-index", "--cached", "--name-only", "--diff-filter=ACMRTUXB", "HEAD"]
     if lazy:

isort/io.py

@@ -66,7 +66,7 @@ def read(filename: Union[str, Path]) -> Iterator["File"]:
 
 
 class _EmptyIO(StringIO):
-    def write(self, *args, **kwargs):
+    def write(self, *args, **kwargs):  # skipcq: PTC-W0049
         pass
 
 

isort/main.py

@@ -1089,6 +1089,7 @@ def main(argv: Optional[Sequence[str]] = None, stdin: Optional[TextIOWrapper] =
                 show_diff=show_diff,
                 file_path=file_path,
                 extension=ext_format,
+                raise_on_skip=False,
             )
     elif "/" in file_names and not allow_root:
         printer = create_terminal_printer(color=config.color_output)

isort/wrap.py

@@ -130,9 +130,8 @@ def line(content: str, line_separator: str, config: Config = DEFAULT_CONFIG) ->
                         lines[-1] = content + ")" + config.comment_prefix + comment[:-1]
                     return line_separator.join(lines)
                 return f"{content}{splitter}\\{line_separator}{cont_line}"
-    elif len(content) > config.line_length and wrap_mode == Modes.NOQA:  # type: ignore
-        if "# NOQA" not in content:
-            return f"{content}{config.comment_prefix} NOQA"
+    elif len(content) > config.line_length and wrap_mode == Modes.NOQA and "# NOQA" not in content:  # type: ignore
+        return f"{content}{config.comment_prefix} NOQA"
 
     return content
 

tests/unit/test_main.py

@@ -918,6 +918,31 @@ def test_unsupported_encodings(tmpdir, capsys):
     out, error = capsys.readouterr()
 
 
+def test_stream_skip_file(tmpdir, capsys):
+    input_with_skip = """
+# isort: skip_file
+import b
+import a
+"""
+    stream_with_skip = as_stream(input_with_skip)
+    main.main(["-"], stdin=stream_with_skip)
+    out, error = capsys.readouterr()
+    assert out == input_with_skip
+
+    input_without_skip = input_with_skip.replace("isort: skip_file", "generic comment")
+    stream_without_skip = as_stream(input_without_skip)
+    main.main(["-"], stdin=stream_without_skip)
+    out, error = capsys.readouterr()
+    assert (
+        out
+        == """
+# generic comment
+import a
+import b
+"""
+    )
+
+
 def test_only_modified_flag(tmpdir, capsys):
     # ensures there is no verbose output for correct files with only-modified flag