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I want to append <:> to vim.opt.matchpairs, which AFAIK is a string type.

Neovim lua doc says:

                                                            vim.opt:append()
Option:append(value)

    Append a value to string-style options. See :set+=

    These are equivalent:
        vim.opt.formatoptions:append('j')
        vim.opt.formatoptions = vim.opt.formatoptions + 'j'

I have this line on init.lua:

vim.o.matchpairs:append("<:>")

But Neovim returns an error:

...attempt to call method 'append' (a nil value)...

How can I solve this problem?

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  • Do you still have something open? How can we help you further? If the solution address your need maybe could you accept it using the v button next to the arrow voting buttons. It allow the question to rest :-) Commented May 27, 2023 at 12:47

1 Answer 1

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My understanding is that vim.o.matchpairs is a string.

I would do:

vim.o.matchpairs = vim.o.matchpairs .. ",<:>"

or to take into account that `vim.o.matchpairs" could be empty

if not vim.o.matchpairs then
  vim.o.matchpairs = vim.o.matchpairs .. ","
end
vim.o.matchpairs = vim.o.matchpairs .. "<:>"

I suppose the confusion comes from o vs. opt.

You could also do:

vim.opt.matchpairs:append("<:>")
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  • 1
    Oh lord… vim.o and vim.opt are different but the same? That seems like it could cause no end of confusion. Interesting to learn that .. is also Lua's string concatenation operator, but + is the same as :append.
    – D. Ben Knoble
    Commented May 26, 2023 at 12:55
  • The o seems to be string versions of the opt versions. It allows to write Lua code that iterate over the opt version without having to split the o version into parts. Commented May 26, 2023 at 13:02

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