Support old Vims without +multibyte

powerline/bindings/vim/__init__.py

@@ -12,10 +12,36 @@ except ImportError:
 from powerline.lib.unicode import unicode
 
 
-try:
-	vim_encoding = vim.eval('&encoding')
-except AttributeError:
-	vim_encoding = 'utf-8'
+if (
+	hasattr(vim, 'options')
+	and hasattr(vim, 'vvars')
+	and vim.vvars['version'] > 703
+):
+	if sys.version_info < (3,):
+		def get_vim_encoding():
+			return vim.options['encoding'] or 'ascii'
+	else:
+		def get_vim_encoding():
+			return vim.options['encoding'].decode('ascii') or 'ascii'
+elif hasattr(vim, 'eval'):
+	def get_vim_encoding():
+		return vim.eval('&encoding') or 'ascii'
+else:
+	def get_vim_encoding():
+		return 'utf-8'
+
+get_vim_encoding.__doc__ = (
+	'''Get encoding used for Vim strings
+
+	:return:
+		Value of ``&encoding``. If it is empty (i.e. Vim is compiled 
+		without +multibyte) returns ``'ascii'``. When building documentation 
+		outputs ``'utf-8'`` unconditionally.
+	'''
+)
+
+
+vim_encoding = get_vim_encoding()
 
 
 python_to_vim_types = {

powerline/renderers/vim.py

@@ -5,7 +5,7 @@ import sys
 
 import vim
 
-from powerline.bindings.vim import vim_get_func, vim_getoption, environ, current_tabpage
+from powerline.bindings.vim import vim_get_func, vim_getoption, environ, current_tabpage, get_vim_encoding
 from powerline.renderer import Renderer
 from powerline.colorscheme import ATTR_BOLD, ATTR_ITALIC, ATTR_UNDERLINE
 from powerline.theme import Theme
@@ -42,7 +42,7 @@ class VimRenderer(Renderer):
 		self.hl_groups = {}
 		self.prev_highlight = None
 		self.strwidth_error_name = register_strwidth_error(self.strwidth)
-		self.encoding = vim.eval('&encoding')
+		self.encoding = get_vim_encoding()
 
 	def shutdown(self):
 		self.theme.shutdown()

powerline/vim.py

@@ -8,7 +8,7 @@ from itertools import count
 
 import vim
 
-from powerline.bindings.vim import vim_get_func, vim_getvar
+from powerline.bindings.vim import vim_get_func, vim_getvar, get_vim_encoding
 from powerline import Powerline, FailedUnicode
 from powerline.lib import mergedicts
 
@@ -73,9 +73,7 @@ class VimPowerline(Powerline):
 			self.setup_kwargs.setdefault('_local_themes', []).append((key, config))
 			return True
 
-	@staticmethod
-	def get_encoding():
-		return vim.eval('&encoding')
+	get_encoding = staticmethod(get_vim_encoding)
 
 	def load_main_config(self):
 		return _override_from(super(VimPowerline, self).load_main_config(), 'powerline_config_overrides')