Lint on InsertLeave, not in insert mode by default

b:ale_lint_on_insert_leave is now supported as tests need it.

These defaults are saner and cause fewer issues for users by default.

README.md

@@ -722,11 +722,10 @@ while you type. ALE uses a timeout which is cancelled and reset every time you
 type, and this delay can be increased so linters are run less often. See
 `:help g:ale_lint_delay` for more information.
 
-If you don't wish to run linters while you type, you can disable that
-behaviour. Set `g:ale_lint_on_text_changed` to `never` or `normal`. You won't
-get as frequent error checking, but ALE shouldn't block your ability to edit a
-document after you save a file, so the asynchronous nature of the plugin will
-still be an advantage.
+If you don't wish to run linters while you type, you can disable that behaviour.
+Set `g:ale_lint_on_text_changed` to `never`. You won't get as frequent error
+checking, but ALE shouldn't block your ability to edit a document after you save
+a file, so the asynchronous nature of the plugin will still be an advantage.
 
 If you are still concerned, you can turn the automatic linting off altogether,
 including the option `g:ale_lint_on_enter`, and you can run ALE manually with

autoload/ale/events.vim

@@ -128,7 +128,7 @@ function! ale#events#Init() abort
             endif
 
             if g:ale_lint_on_insert_leave
-                autocmd InsertLeave * call ale#Queue(0)
+                autocmd InsertLeave * if ale#Var(str2nr(expand('<abuf>')), 'lint_on_insert_leave') | call ale#Queue(0) | endif
             endif
 
             if g:ale_echo_cursor || g:ale_cursor_detail

doc/ale.txt

@@ -84,7 +84,7 @@ have even saved your changes. ALE will check your code in the following
 circumstances, which can be configured with the associated options.
 
 * When you modify a buffer.                - |g:ale_lint_on_text_changed|
-* On leaving insert mode. (off by default) - |g:ale_lint_on_insert_leave|
+* On leaving insert mode.                  - |g:ale_lint_on_insert_leave|
 * When you open a new or modified buffer.  - |g:ale_lint_on_enter|
 * When you save a buffer.                  - |g:ale_lint_on_save|
 * When the filetype changes for a buffer.  - |g:ale_lint_on_filetype_changed|
@@ -953,7 +953,7 @@ g:ale_lint_on_save                                         *g:ale_lint_on_save*
 g:ale_lint_on_text_changed                         *g:ale_lint_on_text_changed*
 
   Type: |String|
-  Default: `'always'`
+  Default: `'normal'`
 
   This option controls how ALE will check your files as you make changes.
   The following values can be used.
@@ -978,6 +978,7 @@ g:ale_lint_on_text_changed                         *g:ale_lint_on_text_changed*
 
 
 g:ale_lint_on_insert_leave                         *g:ale_lint_on_insert_leave*
+                                                   *b:ale_lint_on_insert_leave*
 
   Type: |Number|
   Default: `0`
@@ -992,6 +993,10 @@ g:ale_lint_on_insert_leave                         *g:ale_lint_on_insert_leave*
     " Make using Ctrl+C do the same as Escape, to trigger autocmd commands
     inoremap <C-c> <Esc>
 <
+  A buffer-local version of this setting `b:ale_lint_on_insert_leave` can be
+  set to `0` to disable linting when leaving insert mode. The setting must
+  be enabled globally to be enabled locally.
+
   You should set this setting once before ALE is loaded, and restart Vim if
   you want to change your preferences. See |ale-lint-settings-on-startup|.
 

plugin/ale.vim

@@ -71,12 +71,12 @@ let g:ale_linter_aliases = get(g:, 'ale_linter_aliases', {})
 let g:ale_lint_delay = get(g:, 'ale_lint_delay', 200)
 
 " This flag can be set to 'never' to disable linting when text is changed.
-" This flag can also be set to 'insert' or 'normal' to lint when text is
-" changed only in insert or normal mode respectively.
-let g:ale_lint_on_text_changed = get(g:, 'ale_lint_on_text_changed', 'always')
+" This flag can also be set to 'always' or 'insert' to lint when text is
+" changed in both normal and insert mode, or only in insert mode respectively.
+let g:ale_lint_on_text_changed = get(g:, 'ale_lint_on_text_changed', 'normal')
 
 " This flag can be set to 1 to enable linting when leaving insert mode.
-let g:ale_lint_on_insert_leave = get(g:, 'ale_lint_on_insert_leave', 0)
+let g:ale_lint_on_insert_leave = get(g:, 'ale_lint_on_insert_leave', 1)
 
 " This flag can be set to 0 to disable linting when the buffer is entered.
 let g:ale_lint_on_enter = get(g:, 'ale_lint_on_enter', 1)

test/test_ale_info.vader

@@ -31,8 +31,8 @@ Before:
   let g:ale_completion_enabled = 0
   let g:ale_completion_max_suggestions = 50
   let g:ale_history_log_output = 1
-  let g:ale_lint_on_insert_leave = 0
-  let g:ale_lint_on_text_changed = 'always'
+  let g:ale_lint_on_insert_leave = 1
+  let g:ale_lint_on_text_changed = 'normal'
   let g:ale_lsp_error_messages = {}
   let g:ale_maximum_file_size = 0
   let g:ale_pattern_options = {}
@@ -88,9 +88,9 @@ Before:
   \  'let g:ale_lint_delay = 200',
   \  'let g:ale_lint_on_enter = 1',
   \  'let g:ale_lint_on_filetype_changed = 1',
-  \  'let g:ale_lint_on_insert_leave = 0',
+  \  'let g:ale_lint_on_insert_leave = 1',
   \  'let g:ale_lint_on_save = 1',
-  \  'let g:ale_lint_on_text_changed = ''always''',
+  \  'let g:ale_lint_on_text_changed = ''normal''',
   \  'let g:ale_linter_aliases = {}',
   \  'let g:ale_linters = {}',
   \  'let g:ale_linters_explicit = 0',

test/test_autocmd_commands.vader

@@ -87,7 +87,7 @@ Execute (All events should be set up when everything is on):
   \   'CursorMoved * if exists(''*ale#engine#Cleanup'') | call ale#cursor#EchoCursorWarningWithDelay() | endif',
   \   'FileChangedShellPost * call ale#events#FileChangedEvent(str2nr(expand(''<abuf>'')))',
   \   'FileType * call ale#events#FileTypeEvent( str2nr(expand(''<abuf>'')), expand(''<amatch>''))',
-  \   'InsertLeave * call ale#Queue(0)',
+  \   'InsertLeave * if ale#Var(str2nr(expand(''<abuf>'')), ''lint_on_insert_leave'') | call ale#Queue(0) | endif',
   \   'InsertLeave if exists(''*ale#engine#Cleanup'') | call ale#cursor#EchoCursorWarning() | endif',
   \   'TextChanged * call ale#Queue(g:ale_lint_delay)',
   \   'TextChangedI * call ale#Queue(g:ale_lint_delay)',
@@ -158,7 +158,7 @@ Execute (g:ale_lint_on_insert_leave = 1 should bind InsertLeave):
 
   AssertEqual
   \ [
-  \   'InsertLeave * call ale#Queue(0)',
+  \   'InsertLeave * if ale#Var(str2nr(expand(''<abuf>'')), ''lint_on_insert_leave'') | call ale#Queue(0) | endif',
   \ ],
   \ filter(CheckAutocmd('ALEEvents'), 'v:val =~ ''^InsertLeave''')
 

test/test_cursor_warnings.vader

@@ -1,6 +1,10 @@
 Before:
   Save g:ale_echo_msg_format
   Save g:ale_echo_cursor
+  Save b:ale_lint_on_insert_leave
+
+  let g:ale_echo_msg_format = '%code: %%s'
+  let b:ale_lint_on_insert_leave = 0
 
   " We should prefer the error message at column 10 instead of the warning.
   let g:ale_buffer_info = {
@@ -91,6 +95,9 @@ Before:
     return empty(l:lines) ? '' : l:lines[-1]
   endfunction
 
+  call ale#linter#Reset()
+  call ale#linter#PreventLoading('javascript')
+
 After:
   Restore
 
@@ -117,6 +124,8 @@ After:
     noautocmd :q!
   endif
 
+  call ale#linter#Reset()
+
 Given javascript(A Javscript file with warnings/errors):
   var x = 3 + 12345678
   var x = 5*2 + parseInt("10");