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vim-patch:9.1.1166: command-line auto-completion hard with wildmenu

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Problem:  command-line auto-completion hard with wildmenu
Solution: implement "noselect" wildoption value (Girish Palya)

When `noselect` is present in `wildmode` and 'wildmenu' is enabled, the
completion menu appears without pre-selecting the first item.

This change makes it easier to implement command-line auto-completion,
where the menu dynamically appears as characters are typed, and `<Tab>`
can be used to manually select an item. This can be achieved by
leveraging the `CmdlineChanged` event to insert `wildchar(m)`,
triggering completion menu.

Without this change, auto-completion using the 'wildmenu' mechanism is
not feasible, as it automatically inserts the first match, preventing
dynamic selection.

The following Vimscript snippet demonstrates how to configure
auto-completion using `noselect`:

```vim
vim9script
set wim=noselect:lastused,full wop=pum wcm=<C-@> wmnu
autocmd CmdlineChanged : timer_start(0, function(CmdComplete, [getcmdline()]))

def CmdComplete(cur_cmdline: string, timer: number)
  var [cmdline, curpos] = [getcmdline(), getcmdpos()]
  if cur_cmdline ==# cmdline  # Avoid completing each character in keymaps and pasted text
    && !pumvisible() && curpos == cmdline->len() + 1

    if cmdline[curpos - 2] =~ '[\w*/:]'  # Reduce noise by completing only selected characters
      feedkeys("\<C-@>", "ti")
      set eventignore+=CmdlineChanged  # Suppress redundant completion attempts
      timer_start(0, (_) => {
        getcmdline()->substitute('\%x00$', '', '')->setcmdline()  # Remove <C-@> if no completion items exist
        set eventignore-=CmdlineChanged
      })
    endif
  endif
enddef
```

fixes: vim/vim#16551
closes: vim/vim#16759

2bacc3e5fb

Cherry-pick Wildmode_Tests() change from patch 9.0.0418.

Co-authored-by: Girish Palya <girishji@gmail.com>
Signed-off-by: Tomas Slusny <slusnucky@gmail.com>
This commit is contained in:
Tomas Slusny
2025-03-03 17:51:42 +01:00
committed by zeertzjq
parent 948179cb19
commit 99d688e645
9 changed files with 105 additions and 19 deletions
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13
src/nvim/options.lua
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@@ -10020,7 +10020,7 @@ local options = {
cb = 'did_set_wildmode',
defaults = 'full',
-- Keep this in sync with check_opt_wim().
values = { 'full', 'longest', 'list', 'lastused' },
values = { 'full', 'longest', 'list', 'lastused', 'noselect' },
flags = true,
deny_duplicates = false,
desc = [=[
@@ -10042,7 +10042,10 @@ local options = {
"lastused" When completing buffer names and more than one buffer
matches, sort buffers by time last used (other than
the current buffer).
When there is only a single match, it is fully completed in all cases.
"noselect" Do not pre-select first menu item and start 'wildmenu'
if it is enabled.
When there is only a single match, it is fully completed in all cases
except when "noselect" is present.
Examples of useful colon-separated values:
"longest:full" Like "longest", but also start 'wildmenu' if it is
@@ -10065,7 +10068,11 @@ local options = {
set wildmode=list,full
< List all matches without completing, then each full match >vim
set wildmode=longest,list
< Complete longest common string, then list alternatives.
< Complete longest common string, then list alternatives >vim
set wildmode=noselect:full
< Display 'wildmenu' without completing, then each full match >vim
set wildmode=noselect:lastused,full
< Same as above, but sort buffers by time last used.
More info here: |cmdline-completion|.
]=],
full_name = 'wildmode',