"" airline settings.
let g:airline_theme = 'simple'
let g:airline_powerline_fonts = 1
if !exists('g:airline_symbols')
 let g:airline_symbols = {}
endif
let g:airline_left_sep = ''
let g:airline_left_alt_sep = ''
let g:airline_right_sep = ''
let g:airline_right_alt_sep = ''
let g:airline_symbols.branch = ''
let g:airline_symbols.readonly = ''
let g:airline_symbols.linenr = ''
let g:airline#extensions#tabline#enabled = 1
" show absolute file path in status line
let g:airline_section_c = '%<%F%m %#__accent_red#%{airline#util#wrap(airline#parts#readonly(),0)}%#__restore__#'
" show tab number in tab line
let g:airline#extensions#tabline#tab_nr_type = 1

" panel navigators
nnoremap <C-J> <C-W><C-J>
nnoremap <C-K> <C-W><C-K>
nnoremap <C-L> <C-W><C-L>
nnoremap <C-H> <C-W><C-H>

" map keys for vertical/horizontal split panel
nnoremap <leader>vs <C-w>v
nnoremap <leader>hs <C-w>s

" map keys for resize vertical/horizontal window:
nnoremap <silent> + :exe "resize " . (winheight(0) * 4/3)<CR>
nnoremap <silent> _ :exe "resize " . (winheight(0) * 3/4)<CR>
nnoremap <silent> > :exe "vertical resize " . (winwidth(0) * 4/3)<CR>
nnoremap <silent> < :exe "vertical resize " . (winwidth(0) * 3/4)<CR>