" Appearance
let g:ale_sign_error = '⨉'
let g:ale_sign_warning = '⚠'
let g:ale_echo_msg_format = '[%linter%] %s [%severity%]'
let g:ale_sign_column_always = 1

" Event of lint enter
let g:ale_lint_on_enter = 0
let g:ale_lint_on_save = 1
let g:ale_lint_on_text_changed = 'never'

" Quickfix and Loclist
let g:ale_set_loclist = 0
let g:ale_set_quickfix = 0
let g:ale_open_list = 0
let g:ale_keep_list_window_open = 0

" Enable linter
let g:ale_linters = {
\   'javascript': ['jslint', 'eslint'],
\   'python': ['flake8'],
\   'markdown': ['mdl'],
\}

" Status line status
let g:airline#extensions#ale#enabled = 1
let g:ale_statusline_format = ['⨉ %d', '⚠ %d', '⬥ ok']

function! LinterStatus() abort
    let l:counts = ale#statusline#Count(bufnr(''))

    let l:all_errors = l:counts.error + l:counts.style_error
    let l:all_non_errors = l:counts.total - l:all_errors

    return l:counts.total == 0 ? 'OK' : printf(
    \   '%dW %dE',
    \   all_non_errors,
    \   all_errors
    \)
endfunction
set statusline=%{LinterStatus()}

" Prefix key
nmap [ale] <Nop>
map <C-k> [ale]

" Keymap
nmap <silent> [ale]<C-P> <Plug>(ale_previous)
nmap <silent> [ale]<C-N> <Plug>(ale_next)