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+.. _dev-listers:
+
+***************
+Writing listers
+***************
+
+Listers provide a way to show some segments multiple times: once per each entity 
+(buffer, tabpage, etc) lister knows. They are functions which receive the 
+following arguments:
+
+``pl``
+    A :py:class:`powerline.PowerlineLogger` class instance. It must be used for 
+    logging.
+
+``segment_info``
+    Base segment info dictionary. Lister function or class must have 
+    ``powerline_requires_segment_info`` to receive this argument.
+
+    .. warning::
+        Listers are close to useless if they do not have access to this 
+        argument.
+
+    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).
+
+Listers must return a sequence of pairs. First item in the pair must contain 
+a ``segment_info`` dictionary specific to one of the listed entities.
+
+Second item must contain another dictionary: it will be used to modify the 
+resulting segment. In addition to :ref:`usual keys that describe segment 
+<dev-segments-segment>` the following keys may be present (it is advised that 
+*only* the following keys will be used):
+
+``priority_multiplier``
+    Value (usually a ``float``) used to multiply segment priority. It is useful 
+    for finer-grained controlling which segments disappear first: e.g. when 
+    listing tab pages make first disappear directory names of the tabpages which 
+    are most far away from current tabpage, then (when all directory names 
+    disappeared) buffer names. Check out existing listers implementation in 
+    :file:`powerline/listers/vim.py`.