vim-airline/autoload/airline/extensions/neomake.vim

" MIT License. Copyright (c) 2013-2021 Bailey Ling et al.
" Plugin: https://github.com/neomake/neomake
" vim: et ts=2 sts=2 sw=2

if !exists(':Neomake')
  finish
endif

let s:error_symbol = get(g:, 'airline#extensions#neomake#error_symbol', 'E:')
let s:warning_symbol = get(g:, 'airline#extensions#neomake#warning_symbol', 'W:')

function! s:get_counts()
  let l:counts = neomake#statusline#LoclistCounts()

  if empty(l:counts)
    return neomake#statusline#QflistCounts()
  else
    return l:counts
  endif
endfunction

function! airline#extensions#neomake#get_warnings()
  let counts = s:get_counts()
  let warnings = get(counts, 'W', 0)
  return warnings ? s:warning_symbol.warnings : ''
endfunction

function! airline#extensions#neomake#get_errors()
  let counts = s:get_counts()
  let errors = get(counts, 'E', 0)
  return errors ? s:error_symbol.errors : ''
endfunction

function! airline#extensions#neomake#init(ext)
  call airline#parts#define_function('neomake_warning_count', 'airline#extensions#neomake#get_warnings')
  call airline#parts#define_function('neomake_error_count', 'airline#extensions#neomake#get_errors')
endfunction