" MIT License. Copyright (c) 2013 Bailey Ling. " vim: et ts=2 sts=2 sw=2 " Extension specific variables can be defined the usual fashion. if !exists('g:airline#extensions#example#number_of_cats') let g:airline#extensions#example#number_of_cats = 42 endif " First you should follow the convention and define an 'init' function. " It takes a single argument, which is the 'ext'ension manager of sorts, " which you can invoke certain functions. The most important one is " 'add_statusline_func', which as the name implies, adds a function to " the collection such that it will be invoked prior to changes being made " to the statusline. Finally, invoke this init function in the " 'extensions.vim' file after a check to a non-autoloaded variable, " command, or function. function! airline#extensions#example#init(ext) call a:ext.add_statusline_func('airline#extensions#example#apply') " Alternatively, you can also modify the default global section by " appending or prepending to it. But read on to see why using the funcref " method is preferred. let g:airline_section_y .= '%{airline#extensions#example#nyancat()}' endfunction function! airline#extensions#example#apply(...) " Here we are checking for the filetype, allowing for the extension to " be loaded only in certain cases. if &filetype == "nyancat" " Then we define a window-local variable, which overrides the default " g: variable. let w:airline_section_gutter = \ g:airline_section_gutter \ .' %{airline#extensions#example#get_cats()}' endif endfunction " Finally, this function will be invoked from the statusline. function! airline#extensions#example#get_cats() let cats = '' for i in range(1, g:airline#extensions#example#number_of_cats) let cats .= ' (,,,)=(^.^)=(,,,) ' endfor return cats endfunction