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omni: racket should complete at end of keywords (#4352) 

Consider a file like
```
 #lang racket
(require racket/gui)
```
Type `Go(eventspace-`.

Pressing <C-x><C-o> to trigger omnicomplete should suggest
```
eventspace-handler-thread
eventspace-shutdown?
eventspace-event-evt
```

It does not (instead producing "top-level" completions, as if
`(eventspace-` wasn't even there).

Debugging, place the cursor on a space _after_. Now
`ale#completion#OmniFunc(1, '')` correctly returns `1`, but when given
`(0, 'eventspace-')` it returns either the empty list or generic
completion results as described above. I'm not entirely sure of the
mechanism, but it seems that `b:ale_completion_info.prefix` is the key,
and that this is set by `ale#completion#GetPrefix`. Calling
`ale#completion#GetPrefix('racket', line('.'), col('.'))` returned `''`!

Now, it returns `eventspace-` and the completions work correctly again.

Ref #4293, #4186, #3870
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D. Ben Knoble 2022-11-05 03:47:59 -04:00 committed by GitHub
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autoload/ale/completion.vim
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@ -130,6 +130,7 @@ let s:should_complete_map = {
\ '<default>': '\v[a-zA-Z$_][a-zA-Z$_0-9]*$|\.$', \ '<default>': '\v[a-zA-Z$_][a-zA-Z$_0-9]*$|\.$',
\ 'clojure': s:lisp_regex, \ 'clojure': s:lisp_regex,
\ 'lisp': s:lisp_regex, \ 'lisp': s:lisp_regex,
\ 'racket': '\k\+$',
\ 'typescript': '\v[a-zA-Z$_][a-zA-Z$_0-9]*$|\.$|''$|"$', \ 'typescript': '\v[a-zA-Z$_][a-zA-Z$_0-9]*$|\.$|''$|"$',
\ 'rust': '\v[a-zA-Z$_][a-zA-Z$_0-9]*$|\.$|::$', \ 'rust': '\v[a-zA-Z$_][a-zA-Z$_0-9]*$|\.$|::$',
\ 'cpp': '\v[a-zA-Z$_][a-zA-Z$_0-9]*$|\.$|::$|-\>$', \ 'cpp': '\v[a-zA-Z$_][a-zA-Z$_0-9]*$|\.$|::$|-\>$',