Set up one BufEnter event used for everything, and add tests for linting when the filetype changes

1 files changed, 11 insertions, 0 deletions

diff --git a/autoload/ale/events.vim b/autoload/ale/events.vim
index 3cfe5478..a3b74677 100644
--- a/autoload/ale/events.vim
+++ b/autoload/ale/events.vim
@@ -24,9 +24,20 @@ function! s:LintOnEnter(buffer) abort
 endfunction
 
 function! ale#events#EnterEvent(buffer) abort
+    let l:filetype = getbufvar(a:buffer, '&filetype')
+    call setbufvar(a:buffer, 'ale_original_filetype', l:filetype)
+
     call s:LintOnEnter(a:buffer)
 endfunction
 
+function! ale#events#FileTypeEvent(buffer, new_filetype) abort
+    let l:filetype = getbufvar(a:buffer, 'ale_original_filetype', '')
+
+    if a:new_filetype isnot# l:filetype
+        call ale#Queue(300, 'lint_file', a:buffer)
+    endif
+endfunction
+
 function! ale#events#FileChangedEvent(buffer) abort
     call setbufvar(a:buffer, 'ale_file_changed', 1)