Support b:ale_completion_enabled for disabling it for some buffers

autoload/ale/completion.vim

@@ -584,7 +584,7 @@ function! ale#completion#GetCompletions(source) abort
 endfunction
 
 function! s:TimerHandler(...) abort
-    if !g:ale_completion_enabled
+    if !get(b:, 'ale_completion_enabled', g:ale_completion_enabled)
         return
     endif
 
@@ -609,7 +609,7 @@ function! ale#completion#StopTimer() abort
 endfunction
 
 function! ale#completion#Queue() abort
-    if !g:ale_completion_enabled
+    if !get(b:, 'ale_completion_enabled', g:ale_completion_enabled)
         return
     endif
 

doc/ale.txt

@@ -560,6 +560,7 @@ g:ale_completion_delay                                 *g:ale_completion_delay*
 
 
 g:ale_completion_enabled                             *g:ale_completion_enabled*
+b:ale_completion_enabled                             *b:ale_completion_enabled*
 
   Type: |Number|
   Default: `0`
@@ -572,6 +573,10 @@ g:ale_completion_enabled                             *g:ale_completion_enabled*
   This setting should not be enabled if you wish to use ALE as a completion
   source for other completion plugins.
 
+  A buffer-local version of this setting `b:ale_completion_enabled` can be set
+  to `0` to disable ALE's automatic completion support for a single buffer.
+  ALE's completion support must be enabled globally to be enabled locally.
+
   See |ale-completion|
 
 

test/completion/test_completion_events.vader

@@ -5,6 +5,7 @@ Before:
   Save &l:omnifunc
   Save &l:completeopt
 
+  unlet! b:ale_completion_enabled
   let g:ale_completion_enabled = 1
   let g:get_completions_called = 0
   let g:feedkeys_calls = []
@@ -49,6 +50,7 @@ Before:
 After:
   Restore
 
+  unlet! b:ale_completion_enabled
   unlet! g:output
   unlet! g:fake_mode
   unlet! g:get_completions_called
@@ -78,6 +80,14 @@ After:
 Execute(ale#completion#GetCompletions should be called when the cursor position stays the same):
   call CheckCompletionCalled(1)
 
+Execute(ale#completion#GetCompletions should not be called if the global setting is disabled):
+  let g:ale_completion_enabled = 0
+  call CheckCompletionCalled(0)
+
+Execute(ale#completion#GetCompletions should not be called if the buffer setting is disabled):
+  let b:ale_completion_enabled = 0
+  call CheckCompletionCalled(0)
+
 Given typescript():
   let abc = y.
   let foo = ab