Add VimEnviron object

powerline/bindings/vim/__init__.py

@@ -79,3 +79,21 @@ else:
 		if type(r) is bytes:
 			return r.decode('utf-8')
 		return r
+
+
+class VimEnviron(object):
+	@staticmethod
+	def __getitem__(key):
+		return vim.eval('$' + key)
+
+	@staticmethod
+	def get(key, default=None):
+		return vim.eval('$' + key) or default
+
+	@staticmethod
+	def __setitem__(key, value):
+		return vim.command('let $' + key + '="'
+					+ value.replace('"', '\\"').replace('\\', '\\\\').replace('\n', '\\n').replace('\0', '')
+					+ '"')
+
+environ = VimEnviron()

powerline/renderers/vim.py

@@ -2,7 +2,7 @@
 
 from __future__ import absolute_import
 
-from powerline.bindings.vim import vim_get_func
+from powerline.bindings.vim import vim_get_func, environ
 from powerline.renderer import Renderer
 from powerline.colorscheme import ATTR_BOLD, ATTR_ITALIC, ATTR_UNDERLINE
 from powerline.theme import Theme
@@ -80,6 +80,7 @@ class VimRenderer(Renderer):
 			'mode': mode,
 			'window_id': window_id,
 			'winnr': winnr,
+			'environ': environ,
 		}
 		segment_info['buffer'] = segment_info['window'].buffer
 		segment_info['bufnr'] = segment_info['buffer'].number