buffer source not showing up in : type cmdline when enabled

[anonymousgrasshopper]

In my opts.cmdline.sources, I have added the following to the function:

local text = vim.fn.getcmdline()
if
	text:match("^[: ]*%%?%s*s%s*%W")
	or text:match("^[: ]*'<,'>%s*s%s*%W")
	or text:match("^[: ]*%d+%s*,%s*%d+%s*s%s*%W")
then
	return { "buffer" } -- substitute command
end

the idea being that when I use the substitute command, text from the buffer would be suggested instead of nothing (as it was with the cmdline source).
However, nothing gets suggested at all. Even if I add "buffer" as a source for all cmdline completions, the buffer source doesn't suggest anything when vim.fn.getcmdtype() == ":". Is there a way to add the "buffer" source in a ":" cmdline ?

[soifou]

You're lucky, this has been implemented in v1.4.0, just turn on sources.providers.buffer.opts.enable_in_ex_commands.

See also issue #1625