Update vim test module to implement 'getbufvar(...)'

This allows the tests for the buffer tablist to pass, since it now uses
getbufvar(nr, '&modified') to detect whether the buffer needs to be
modified

powerline/listers/vim.py

@@ -102,7 +102,7 @@ def bufferlister(pl, segment_info, show_unlisted=False, **kwargs):
 		))(
 			buffer,
 			'buf' if buffer is cur_buffer else 'buf_nc',
-			'_mod' if int(vim.eval('getbufvar(%s, \'&mod\')' % buffer.number)) > 0 else ''
+			'_mod' if int(vim.eval('getbufvar(%s, \'&modified\')' % buffer.number)) > 0 else ''
 		)
 		for buffer in vim.buffers if (
 		    buffer is cur_buffer

tests/vim.py

@@ -265,6 +265,14 @@ def eval(expr):
 		import os
 		assert os.path.basename(current.buffer.name).startswith('NERD_tree_')
 		return '/usr/include'
+	elif expr.startswith('getbufvar('):
+		import re
+		match = re.match(r'^getbufvar\((\d+), ["\'](.+)["\']\)$', expr)
+		if not match:
+			raise NotImplementedError(expr)
+		bufnr = int(match.group(1))
+		varname = match.group(2)
+		return _emul_getbufvar(bufnr, varname)
 	elif expr == 'tabpagenr()':
 		return current.tabpage.number
 	elif expr == 'tabpagenr("$")':