[vim/vim] Add compl-filename as a possible value for complete (Issue #20392)

[Andrei Heidelbacher]

andreihh created an issue (vim/vim#20392)

Is your feature request about something that is currently impossible or hard to do? Please describe the problem.

The :h compl-filename completion can be triggered manually in insert mode with <C-X><C-F>. However, there is no way to make this work with autocomplete.

Describe the solution you'd like

Add p (for "paths") as a possible option to complete, similarly to f for buffer names.

Alternatively, provide a Vim function that we could use (and possibly customize with complete-items) as F{func}.

Describe alternatives you've considered

Triggering file completion manually with inomap <C-F> <C-X><C-F>.

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[Mao-Yining]

mao-yining left a comment (vim/vim#20392)

I had a quick look at Vim's source code today. The simplest way to implement this feature is with the script below — the logic matches Vim's internals. I've also tweaked directory handling to make continuous path completion smoother. Give it a try.

export def Path(findstart: number, base: string): any
	if findstart > 0
		var col = col('.') - 1
		var pos = col - 1
		var line = getline('.')->strpart(0, col)

		while pos > 0 && line[pos] =~ '\f'
			--pos
		endwhile

		if pos == 0 && line[pos] =~ '\f'
			return 0
		elseif pos == col - 1
			return -2
		else
			return pos + 1
		endif
	endif
	var res = getcompletion(base, 'file')->mapnew((_, v) => {
		return {word: v->trim('/\', 2), abbr: v}
	})

	return empty(res) ? v:none : res
enddef

Known issues:

• paths cannot contain spaces, since they’re not in isfname.
• menu is placed in different place

plugin:

default.png (view on web)

<C-X><C-F>

default.png (view on web)

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[Mao-Yining]

mao-yining left a comment (vim/vim#20392)

Emm '{' is in 'isfname' on win32. But it will throw error when getting completion getcompletion('{', 'file'), maybe this error canbe omitted on win32?

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[girish]

girishji left a comment (vim/vim#20392)

I think this feature should not be implemented in source: There is no reliable way to back-off when filename search takes a long time (or hangs). Autocomplete timeouts will not help since this task is handled outside of Vim currently, and Vim does not interrupt until the relevant tree is enumerated. Changing this is not trivial.

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