vim-airline-themes/autoload/airline/extensions/undotree.vim

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" MIT License. Copyright (c) 2013 Bailey Ling.
" vim: et ts=2 sts=2 sw=2
function! airline#extensions#undotree#apply(...)
if exists('t:undotree')
if &ft == 'undotree' && exists('*t:undotree.GetStatusLine')
call airline#extensions#apply_left_override('undo', '%{t:undotree.GetStatusLine()}')
else
call airline#extensions#apply_left_override('undotree', '%f')
endif
if &ft == 'diff' && exists('*t:diffpanel.GetStatusLine')
call airline#extensions#apply_left_override('diff', '%{t:diffpanel.GetStatusLine()}')
endif
endif
endfunction
function! airline#extensions#undotree#init(ext)
call a:ext.add_statusline_func('airline#extensions#undotree#apply')
endfunction