Added support for Neovim's terminal buffer mode

autoload/airline.vim

@@ -142,6 +142,8 @@ function! airline#check_mode(winnr)
       let l:mode = ['replace']
     elseif l:m =~# '\v(v|V||s|S|)'
       let l:mode = ['visual']
+    elseif l:m ==# "t"
+      let l:mode = ['terminal']
     else
       let l:mode = ['normal']
     endif

autoload/airline/init.vim

@@ -41,6 +41,7 @@ function! airline#init#bootstrap()
         \ 's'  : 'SELECT',
         \ 'S'  : 'S-LINE',
         \ '' : 'S-BLOCK',
+        \ 't'  : 'TERMINAL',
         \ }, 'keep')
 
   call s:check_defined('g:airline_theme_map', {})