#653 - Jump to the position which Vim does not jump to for moving from quickfix/loclist items to other buffers

autoload/ale/events.vim

@@ -60,10 +60,40 @@ function! s:HitReturn(...) abort
 
         if get(split(l:output, "\n"), -1, '') =~# '^E92[456]'
             call ale#util#FeedKeys("\<CR>", 'n')
+
+            " If we hit one of the errors and cleared it, then Vim didn't
+            " move to the position we wanted. Change the position to the one
+            " the user selected.
+            if exists('g:ale_list_window_selection')
+                let l:pos = getcurpos()
+                let [l:pos[1], l:pos[2]] = g:ale_list_window_selection
+                call setpos('.', l:pos)
+            endif
         endif
     endif
+
+    " Always clear the last selection when trying to cancel the errors above
+    " here. This prevents us from remembering invalid positions.
+    unlet! g:ale_list_window_selection
 endfunction
 
 function! ale#events#BufWinLeave() abort
     call timer_start(0, function('s:HitReturn'))
 endfunction
+
+" Grab the position for a problem from the loclist or quickfix windows
+" when moving through selections. This selection will be remembered and
+" set as the position when jumping to an error in another file.
+function! ale#events#ParseLoclistWindowItemPosition() abort
+    " Parses lines like
+    " test.txt|72 col 5 error| ...
+    " test.txt|72| ...
+    let l:match = matchlist(getline('.'), '\v^[^|]+\|(\d+)( [^ ]+ )?(\d*)')
+
+    if !empty(l:match)
+        let g:ale_list_window_selection = [
+        \   l:match[1] + 0,
+        \   max([l:match[3] + 0, 1]),
+        \]
+    endif
+endfunction

ftplugin/qf.vim

@@ -0,0 +1,4 @@
+augroup ALEQuickfixCursorMovedEvent
+    autocmd! * <buffer>
+    autocmd CursorMoved <buffer> call ale#events#ParseLoclistWindowItemPosition()
+augroup END

test/test_ale_init_au_groups.vader

@@ -21,8 +21,14 @@ Before:
         let l:header = split(l:line)[1]
         let l:header = get(l:event_name_corrections, l:header, l:header)
       elseif !empty(l:header)
-        call add(l:matches, join(split(l:header . l:line)))
-        let l:header = ''
+        " There's an extra line for buffer events, and we should only look
+        " for the one matching the current buffer.
+        if l:line =~# '<buffer=' . bufnr('') . '>'
+          let l:header .= ' <buffer>'
+        else
+          call add(l:matches, join(split(l:header . l:line)))
+          let l:header = ''
+        endif
       endif
     endfor
 
@@ -54,6 +60,11 @@ After:
 
   call ALEInitAuGroups()
 
+  " Clean up the quickfix group.
+  augroup ALEQuickfixCursorMovedEvent
+    autocmd! * <buffer>
+  augroup END
+
 Execute (g:ale_lint_on_text_changed = 0 should bind no events):
   let g:ale_lint_on_text_changed = 0
 
@@ -211,3 +222,12 @@ Execute(Disabling completion should remove autocmd events correctly):
 
   AssertEqual [], CheckAutocmd('ALECompletionGroup')
   AssertEqual 0, g:ale_completion_enabled
+
+Execute(The cursor events should be set up for the quickfix list):
+  runtime! ftplugin/qf.vim
+
+  AssertEqual
+  \ [
+  \   'CursorMoved <buffer> call ale#events#ParseLoclistWindowItemPosition()',
+  \ ],
+  \ CheckAutocmd('ALEQuickfixCursorMovedEvent')

test/test_list_modification_error_cancelling.vader

@@ -26,6 +26,7 @@ Before:
 After:
   unlet! b:fake_mode
   unlet! b:feedkeys_calls
+  unlet! g:ale_list_window_selection
 
   delfunction CheckError
 
@@ -52,3 +53,44 @@ Execute(The BufWinLeave event function should ignore other errors):
 
 Execute(The BufWinLeave event function not send keys for other modes):
   call CheckError('n', 'E924', [])
+
+Execute(The last window selection should always be cleared by the timer):
+  let g:ale_list_window_selection = [347, 2]
+
+  " The message and mode shouldn't matter, we should still clear the variable.
+  echom 'xyz'
+  let b:fake_mode = 'n'
+  call ale#events#BufWinLeave()
+  sleep 1ms
+
+  Assert !has_key(g:, 'ale_list_window_selection')
+
+Given qf(A quickfix list with some errors):
+  test.txt|23 col 9 warning| Some warning
+  test.txt|72 col 25 error| Some column error
+  test.txt|93 error| Some line error
+
+Execute(Line and column numbers should be parsed by the quickfix event function):
+  call setpos('.', [bufnr(''), 2, 1, 0])
+  call ale#events#ParseLoclistWindowItemPosition()
+  AssertEqual [72, 25], g:ale_list_window_selection
+
+Execute(Just Line numbers should be parsed by the quickfix event function):
+  call setpos('.', [bufnr(''), 3, 1, 0])
+  call ale#events#ParseLoclistWindowItemPosition()
+  AssertEqual [93, 1], g:ale_list_window_selection
+
+Given python(Some example Python file):
+  class FooBar:
+    def whatever(self):
+      self.do_something()
+
+Execute(We should jump to the window selection after cancelling the errors):
+  call setpos('.', [bufnr(''), 1, 1, 0])
+  let g:ale_list_window_selection = [3, 9]
+
+  echom 'E925'
+  call ale#events#BufWinLeave()
+  sleep 1ms
+
+  AssertEqual [3, 9], getcurpos()[1:2]