Apply new-lines check to all lines of a file, not just the first one

tests/rules/test_new_lines.py

@@ -74,12 +74,8 @@ def test_platform_type(self):
             self.check('---\ntext\n', conf)
             self.check('---\r\ntext\r\n', conf, problem=(1, 4))
             self.check('---\r\ntext\n', conf, problem=(1, 4))
-            # FIXME: the following tests currently don't work
-            # because only the first line is checked for line-endings
-            # see: issue #475
-            # ---
-            # self.check('---\ntext\r\nfoo\n', conf, problem=(2, 4))
-            # self.check('---\ntext\r\n', conf, problem=(2, 4))
+            self.check('---\ntext\r\nfoo\n', conf, problem=(2, 5))
+            self.check('---\ntext\r\n', conf, problem=(2, 5))
 
         # mock the Windows new-line-character
         with mock.patch('yamllint.rules.new_lines.linesep', '\r\n'):
@@ -88,9 +84,5 @@ def test_platform_type(self):
             self.check('---\r\ntext\r\n', conf)
             self.check('---\ntext\n', conf, problem=(1, 4))
             self.check('---\ntext\r\n', conf, problem=(1, 4))
-            # FIXME: the following tests currently don't work
-            # because only the first line is checked for line-endings
-            # see: issue #475
-            # ---
-            # self.check('---\r\ntext\nfoo\r\n', conf, problem=(2, 4))
-            # self.check('---\r\ntext\n', conf, problem=(2, 4))
+            self.check('---\r\ntext\nfoo\r\n', conf, problem=(2, 5))
+            self.check('---\r\ntext\n', conf, problem=(2, 5))

yamllint/linter.py

@@ -104,6 +104,10 @@ def process_comment(self, comment):
                     for id in rules:
                         self.rules.discard(id)
 
+        def disable_by_force(self, rule):
+            if rule in self.all_rules:
+                self.rules.add(rule)
+
         def is_disabled_by_directive(self, problem):
             return problem.rule in self.rules
 
@@ -166,6 +170,8 @@ def process_comment(self, comment):
             for problem in cache:
                 if not (disabled_for_line.is_disabled_by_directive(problem) or
                         disabled.is_disabled_by_directive(problem)):
+                    if problem.rule == 'new-lines':
+                        disabled.disable_by_force(problem.rule)
                     yield problem
 
             disabled_for_line = disabled_for_next_line

yamllint/rules/new_lines.py

@@ -51,8 +51,8 @@ def check(conf, line):
     elif conf['type'] == 'dos':
         newline_char = '\r\n'
 
-    if line.start == 0 and len(line.buffer) > line.end:
+    if len(line.buffer) > line.end:
         if line.buffer[line.end:line.end + len(newline_char)] != newline_char:
             c = repr(newline_char).strip('\'')
-            yield LintProblem(1, line.end - line.start + 1,
+            yield LintProblem(line.line_no, line.end - line.start + 1,
                               f'wrong new line character: expected {c}')