Remove the space_check option and its code

Author: Pierre-Sassoulas

ChangeLog

@@ -10,6 +10,9 @@ Release date: TBA
 
 Close #246, #289, #638, #747, #1148, #1179, #1943, #2041, #2301, #2304, #2944, #3565
 
+* The no-space-check option has been removed. It's no longer possible to consider empty line like a `trailing-whitespace` by using clever options
+
+Close #1368
 
 What's New in Pylint 2.5.1?
 ===========================

doc/whatsnew/2.6.rst

@@ -16,4 +16,6 @@ New checkers
 Other Changes
 =============
 
-* `bad-continuation` and `bad-whitespace` have been removed, `black` or another formatter can help you with this better than Pylint
+* `bad-continuation` and `bad-whitespace` have been removed. `black` or another formatter can help you with this better than Pylint
+
+* The `no-space-check` option has been removed, it's no longer possible to consider empty line like a `trailing-whitespace` by using clever options.

pylint/checkers/format.py

@@ -117,13 +117,6 @@
 _MUST_NOT = 1
 _IGNORE = 2
 
-# Whitespace checking config constants
-_DICT_SEPARATOR = "dict-separator"
-_TRAILING_COMMA = "trailing-comma"
-_EMPTY_LINE = "empty-line"
-_NO_SPACE_CHECK_CHOICES = [_TRAILING_COMMA, _DICT_SEPARATOR, _EMPTY_LINE]
-_DEFAULT_NO_SPACE_CHECK_CHOICES = [_TRAILING_COMMA, _DICT_SEPARATOR]
-
 MSGS = {
     "C0301": (
         "Line too long (%s/%s)",
@@ -301,24 +294,6 @@ class FormatChecker(BaseTokenChecker):
                 ),
             },
         ),
-        (
-            "no-space-check",
-            {
-                "default": ",".join(_DEFAULT_NO_SPACE_CHECK_CHOICES),
-                "metavar": ",".join(_NO_SPACE_CHECK_CHOICES),
-                "type": "multiple_choice",
-                "choices": _NO_SPACE_CHECK_CHOICES,
-                "help": (
-                    "List of optional constructs for which whitespace "
-                    "checking is disabled. "
-                    "`" + _DICT_SEPARATOR + "` is used to allow tabulation "
-                    "in dicts, etc.: {1  : 1,\\n222: 2}. "
-                    "`" + _TRAILING_COMMA + "` allows a space between comma "
-                    "and closing bracket: (a, ). "
-                    "`" + _EMPTY_LINE + "` allows space-only lines."
-                ),
-            },
-        ),
         (
             "max-module-lines",
             {
@@ -662,16 +637,13 @@ def check_line_ending(self, line: str, i: int) -> None:
         """
         if not line.endswith("\n"):
             self.add_message("missing-final-newline", line=i)
-        else:
-            # exclude \f (formfeed) from the rstrip
-            stripped_line = line.rstrip("\t\n\r\v ")
-            if not stripped_line and _EMPTY_LINE in self.config.no_space_check:
-                # allow empty lines
-                pass
-            elif line[len(stripped_line) :] not in ("\n", "\r\n"):
-                self.add_message(
-                    "trailing-whitespace", line=i, col_offset=len(stripped_line)
-                )
+            return
+        # exclude \f (formfeed) from the rstrip
+        stripped_line = line.rstrip("\t\n\r\v ")
+        if line[len(stripped_line) :] not in ("\n", "\r\n"):
+            self.add_message(
+                "trailing-whitespace", line=i, col_offset=len(stripped_line)
+            )
 
     def check_line_length(self, line: str, i: int) -> None:
         """

tests/checkers/unittest_format.py

@@ -214,30 +214,6 @@ def testKeywordParensFalsePositive(self):
 class TestCheckSpace(CheckerTestCase):
     CHECKER_CLASS = FormatChecker
 
-    def testEmptyLines(self):
-        self.checker.config.no_space_check = []
-        with self.assertAddsMessages(Message("trailing-whitespace", line=2)):
-            self.checker.process_tokens(_tokenize_str("a = 1\n \nb = 2\n"))
-
-        with self.assertAddsMessages(Message("trailing-whitespace", line=2)):
-            self.checker.process_tokens(_tokenize_str("a = 1\n\t\nb = 2\n"))
-
-        with self.assertAddsMessages(Message("trailing-whitespace", line=2)):
-            self.checker.process_tokens(_tokenize_str("a = 1\n\v\nb = 2\n"))
-
-        with self.assertNoMessages():
-            self.checker.process_tokens(_tokenize_str("a = 1\n\f\nb = 2\n"))
-
-        self.checker.config.no_space_check = ["empty-line"]
-        with self.assertNoMessages():
-            self.checker.process_tokens(_tokenize_str("a = 1\n \nb = 2\n"))
-
-        with self.assertNoMessages():
-            self.checker.process_tokens(_tokenize_str("a = 1\n\t\nb = 2\n"))
-
-        with self.assertNoMessages():
-            self.checker.process_tokens(_tokenize_str("a = 1\n\v\nb = 2\n"))
-
     def test_encoding_token(self):
         """Make sure the encoding token doesn't change the checker's behavior