Update highlight groups for tabline

This changes the buffer highlight groups from buf and buf_nc to
buf, buf_nc, buf_mod, and buf_nc_mod. Doing this allows a higher
level of configurability for the highlight groups used in the
buffer-only tabline.

powerline/config_files/colorschemes/vim/__main__.json

@@ -23,16 +23,25 @@
 		"csv:column_number": "line_current",
 		"csv:column_name":   "line_current_symbol",
 
+		"tab:background":     "background",
+		"tab:divider":        "background:divider",
+
 		"tab_nc:modified_indicator": "modified_indicator",
 		"tab_nc:file_directory":     "information:unimportant",
 		"tab_nc:file_name":          "tab_nc:file_directory",
 		"tab_nc:tabnr":              "tab_nc:file_directory",
 
 		"buf_nc:file_directory":     "tab_nc:file_directory",
-		"buf_nc:file_name":          "tab_nc:file_name",
-		"buf_nc:bufnr":              "tab_nc:tabnr",
+		"buf_nc:file_name":          "buf_nc:file_directory",
+		"buf_nc:bufnr":              "buf_nc:file_directory",
 		"buf_nc:modified_indicator": "tab_nc:modified_indicator",
 
+		"buf_nc_mod:file_directory":     "tab_nc:file_directory",
+		"buf_nc_mod:file_name":          "buf_nc_mod:file_directory",
+		"buf_nc_mod:bufnr":              "buf_nc_mod:file_directory",
+		"buf_nc_mod:modified_indicator": "tab_nc:modified_indicator",
+
+
 		"commandt:label":      "file_name",
 		"commandt:background": "background",
 		"commandt:finder":     "file_name",

powerline/config_files/themes/vim/tabline.json

@@ -67,7 +67,7 @@
 			},
 			{
 				"type": "string",
-				"highlight_groups": ["background"],
+				"highlight_groups": ["tab:background"],
 				"draw_soft_divider": false,
 				"draw_hard_divider": false,
 				"width": "auto"

powerline/listers/vim.py

@@ -2,7 +2,7 @@
 from __future__ import (unicode_literals, division, absolute_import, print_function)
 
 from powerline.theme import requires_segment_info
-from powerline.bindings.vim import (current_tabpage, list_tabpages, vim_getbufoption)
+from powerline.bindings.vim import (current_tabpage, list_tabpages)
 
 try:
 	import vim
@@ -49,7 +49,10 @@ def tablister(pl, segment_info, **kwargs):
 	return (
 		(lambda tabpage, prefix: (
 			tabpage_updated_segment_info(segment_info, tabpage),
-			add_multiplier(tabpage, {'highlight_group_prefix': prefix})
+			add_multiplier(tabpage, {
+				'highlight_group_prefix': prefix,
+				'divider_highlight_group': 'tab:divider'
+			})
 		))(tabpage, 'tab' if tabpage == cur_tabpage else 'tab_nc')
 		for tabpage in list_tabpages()
 	)
@@ -75,7 +78,8 @@ def bufferlister(pl, segment_info, show_unlisted=False, **kwargs):
 	and ``bufnr`` keys set to buffer-specific ones, ``window``, ``winnr`` and 
 	``window_id`` keys set to None.
 
-	Adds either ``buf:`` or ``buf_nc:`` prefix to all segment highlight groups.
+	Adds one of ``buf:``, ``buf_nc:``, ``buf_mod:``, or ``buf_nc_mod`` 
+	prefix to all segment highlight groups.
 
 	:param bool show_unlisted:
 		True if unlisted buffers should be shown as well. Current buffer is 
@@ -89,10 +93,17 @@ def bufferlister(pl, segment_info, show_unlisted=False, **kwargs):
 		return dct
 
 	return (
-		(lambda buffer, prefix: (
+		(lambda buffer, current, modified: (
 			buffer_updated_segment_info(segment_info, buffer),
-			add_multiplier(buffer, {'highlight_group_prefix': prefix}
-		))(buffer, 'buf' if buffer is cur_buffer else 'buf_nc')
+			add_multiplier(buffer, {
+				'highlight_group_prefix': '%s%s' % (current, modified),
+				'divider_highlight_group': 'tab:divider'
+			})
+		))(
+			buffer,
+			'buf' if buffer is cur_buffer else 'buf_nc',
+			'_mod' if int(vim.eval('getbufvar(%s, \'&mod\')' % buffer.number)) > 0 else ''
+		)
 		for buffer in vim.buffers if (
 		    buffer is cur_buffer
 		    or show_unlisted