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patch 9.1.1797: completion: autocompletion can be improved

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Problem:  completion: autocompletion can be improved
Solution: Add support for "longest" and "preinsert" in 'autocomplete';
          add preinserted() (Girish Palya)

* Add support for "longest" in 'completeopt' when 'autocomplete'
  is enabled. (Note: the cursor position does not change automatically
  when 'autocomplete' is enabled.)
* Add support for "preinsert" when 'autocomplete' is enabled. Ensure
  "preinsert" works the same with and without 'autocomplete'
* introduce the preinserted() Vim script function, useful for defining
  custom key mappings.

fixes: #18314
closes: #18387

Signed-off-by: Girish Palya <girishji@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Girish Palya
2025-09-26 17:29:38 +00:00
committed by Christian Brabandt
parent 3fc1f2a00e
commit c05335082a
13 changed files with 336 additions and 114 deletions
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44
runtime/doc/options.txt
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@ -1,4 +1,4 @@
*options.txt* For Vim version 9.1. Last change: 2025 Sep 22
*options.txt* For Vim version 9.1. Last change: 2025 Sep 26
VIM REFERENCE MANUAL by Bram Moolenaar
@ -2256,11 +2256,22 @@ A jump table for the options with a short description can be found at |Q_op|.
to gather more alternatives for your candidate list,
see 'completefuzzycollect'.
longest Only insert the longest common text of the matches. If
the menu is displayed you can use CTRL-L to add more
characters. Whether case is ignored depends on the kind
of completion. For buffer text the 'ignorecase' option is
used.
longest
When 'autocomplete' is not active, only the longest
common prefix of the matches is inserted. If the popup
menu is displayed, you can use CTRL-L to add more
characters. Whether case is ignored depends on the type
of completion. For buffer text the 'ignorecase' option
applies.
When 'autocomplete' is active and no completion item is
selected, the longest common prefix of the matches is
inserted after the cursor. The prefix is taken either
from all displayed items or only from items in the current
buffer. The inserted text is highlighted with
|hl-PreInsert|, and the cursor position does not change
(similar to `"preinsert"`). Press CTRL-Y to accept.
See also |preinserted()|.
menu Use a popup menu to show the possible completions. The
menu is only shown when there is more than one match and
@ -2302,22 +2313,21 @@ A jump table for the options with a short description can be found at |Q_op|.
{only works when compiled with the |+textprop| feature}
preinsert
When 'autocomplete' is not active, inserts the part of the
first candidate word beyond the current completion leader,
highlighted with |hl-PreInsert|. The cursor doesn't move.
Requires "fuzzy" unset and "menuone" in 'completeopt'.
When 'autocomplete' is active, inserts the longest common
prefix of matches (from all shown items or from the
current buffer items). This occurs only when no menu item
is selected. Press CTRL-Y to accept.
Inserts the text of the first completion candidate
beyond the current leader, highlighted with |hl-PreInsert|.
The cursor does not move.
Requires "fuzzy" to be unset, and either "menuone" in
'completeopt' or 'autocomplete' enabled. When
'autocomplete' is enabled, this does not work if
'ignorecase' is set without 'infercase'.
See also |preinserted()|.
preview Show extra information about the currently selected
completion in the preview window. Only works in
combination with "menu" or "menuone".
Only "fuzzy", "popup", "popuphidden", "preinsert" and "preview" have
an effect when 'autocomplete' is enabled.
Only "fuzzy", "longest", "popup", "popuphidden", "preinsert" and
"preview" have an effect when 'autocomplete' is enabled.
This option does not apply to |cmdline-completion|. See 'wildoptions'
for that.