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

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" MIT license. Copyright (c) 2013 Bailey Ling.
" vim: ts=2 sts=2 sw=2 fdm=indent
function! airline#extensions#whitespace#check()
let w:airline_section_warning = '%{get(w:, "airline_active", 0) && search(" $", "nw")'
\ .'? " ".g:airline_whitespace_symbol." " : ""}'
endfunction
function! airline#extensions#whitespace#init(ext)
call a:ext.add_statusline_funcref(function('airline#extensions#whitespace#check'))
endfunction