Parse ignore arguments in flake8 to avoid issues with Atom (#824)

pyls/plugins/flake8_lint.py

@@ -7,6 +7,7 @@
 from pyls import hookimpl, lsp
 
 log = logging.getLogger(__name__)
+FIX_IGNORES_RE = re.compile(r'([^a-zA-Z0-9_,]*;.*(\W+||$))')
 
 
 @hookimpl
@@ -48,6 +49,9 @@ def run_flake8(args):
     """Run flake8 with the provided arguments, logs errors
     from stderr if any.
     """
+    # a quick temporary fix to deal with Atom
+    args = [(i if not i.startswith('--ignore=') else FIX_IGNORES_RE.sub('', i))
+            for i in args if i is not None]
     log.debug("Calling flake8 with args: '%s'", args)
     try:
         cmd = ['flake8']