Add support for `draw_inner_divider` in listers

docs/source/develop/listers.rst

@@ -23,6 +23,12 @@ following arguments:
     Refer to :ref:`segment_info detailed description <dev-segments-info>` for 
     further details.
 
+``draw_inner_divider``
+    If False (default) soft dividers between segments in the listed group will 
+    not be drawn regardless of actual segment settings. If True they will be 
+    drawn, again regardless of actual segment settings. Set it to ``None`` in 
+    order to respect segment settings.
+
 And also any other argument(s) specified by user in :ref:`args key 
 <config-themes-seg-args>` (no additional arguments by default).
 

powerline/config_files/themes/vim/tabline.json

@@ -10,13 +10,11 @@
 					{
 						"name": "tabnr",
 						"after": " ",
-						"draw_soft_divider": false,
 						"exclude_modes": ["tab", "buf", "buf_nc"],
 						"priority": 5
 					},
 					{
 						"name": "file_directory",
-						"draw_soft_divider": false,
 						"priority": 40
 					},
 					{

powerline/segment.py

@@ -95,6 +95,8 @@ def get_attr_func(contents_func, key, args):
 
 def process_segment_lister(pl, segment_info, parsed_segments, side, lister, subsegments, patcher_args):
 	for subsegment_info, subsegment_update in lister(pl=pl, segment_info=segment_info, **patcher_args):
+		draw_inner_divider = subsegment_update.pop('draw_inner_divider', False)
+		old_pslen = len(parsed_segments)
 		for subsegment in subsegments:
 			if subsegment_update:
 				subsegment = subsegment.copy()
@@ -102,6 +104,10 @@ def process_segment_lister(pl, segment_info, parsed_segments, side, lister, subs
 				if subsegment_update['priority_multiplier'] and subsegment['priority']:
 					subsegment['priority'] *= subsegment_update['priority_multiplier']
 			process_segment(pl, side, subsegment_info, parsed_segments, subsegment)
+		new_pslen = len(parsed_segments)
+		if new_pslen > old_pslen + 1 and draw_inner_divider is not None:
+			for i in range(old_pslen, new_pslen - 1) if side == 'left' else range(old_pslen + 1, new_pslen):
+				parsed_segments[i]['draw_soft_divider'] = draw_inner_divider
 	return None