Get rid of unnecessary file.readline() calls.

qutebrowser/misc/editor.py

@@ -82,7 +82,7 @@ class ExternalEditor(QObject):
             encoding = config.get('general', 'editor-encoding')
             try:
                 with open(self._filename, 'r', encoding=encoding) as f:
-                    text = ''.join(f.readlines())  # pragma: no branch
+                    text = f.read()  # pragma: no branch
             except OSError as e:
                 # NOTE: Do not replace this with "raise CommandError" as it's
                 # executed async.

qutebrowser/misc/lineparser.py

@@ -213,9 +213,9 @@ class LineParser(BaseLineParser):
         """Read the data from self._configfile."""
         with self._open('r') as f:
             if self._binary:
-                self.data = [line.rstrip(b'\n') for line in f.readlines()]
+                self.data = [line.rstrip(b'\n') for line in f]
             else:
-                self.data = [line.rstrip('\n') for line in f.readlines()]
+                self.data = [line.rstrip('\n') for line in f]
 
     def save(self):
         """Save the config file."""

qutebrowser/utils/version.py

@@ -112,7 +112,7 @@ def _release_info():
     for fn in glob.glob("/etc/*-release"):
         try:
             with open(fn, 'r', encoding='utf-8') as f:
-                data.append((fn, ''.join(f.readlines())))  # pragma: no branch
+                data.append((fn, f.read()))  # pragma: no branch
         except OSError:
             log.misc.exception("Error while reading {}.".format(fn))
     return data