How to keep C-f C-b work in INSERT mode, after enabled mini.completion?

[dalugm]

Contributing guidelines

• I have read CODE_OF_CONDUCT.md

Module(s)

mini.completion

Question

I have the following config to make neovim have a readline-like behavior in INSERT mode:

vim.keymap.set({ "c", "i" }, "<C-F>", "<Right>", { desc = "Forward char" })
vim.keymap.set({ "c", "i" }, "<C-B>", "<Left>", { desc = "Backward char" })
vim.keymap.set("i", "<C-N>", "<Down>", { desc = "Next line" })
vim.keymap.set("i", "<C-P>", "<Up>", { desc = "Prev line" })

After enabled mini.completion, C-n and C-p still works, while C-f and C-b not.

How to solve this problem? thanks in advance :)

[echasnovski]

This looks like conflicting with default scrolling mappings of 'mini.completion'. There are two approaches to resolve this:

• Create your own mappings after calling require('mini.completion').setup().

• Instruct 'mini.completion' to not create scrolling mappings (or use different keys for it). The "not create at all" approach is something like this:

  require('mini.completion').setup({
    mappings = { scroll_down = '', scroll_up = '' }
  })

[dalugm]

Yes, that's exactly the issue I'm encountering, though I should have made it clearer:

The default configuration of mini.completion causes my key bindings for C-f and C-b to become unworkable.

However, what I want to achieve is: when the popup of mini.completion appears, C-f and C-b should scroll the popup; when there is no popup, C-f and C-b fallback to my previous key bindings (just like blink.cmp does, I'm using it now and I'd like to migrate to mini.completion).

Is this kind of requirement achievable?

[echasnovski]

Yes, this is also possible with the help of MiniCompletion.scroll(). Like this:

require('mini.completion').setup()

local scroll_down_or_right = function() return MiniCompletion.scroll('down') and '' or '<Right>' end
local scroll_up_or_left = function() return MiniCompletion.scroll('up') and '' or '<Left>' end

vim.keymap.set('i', '<C-f>', scroll_down_or_right, { expr = true })
vim.keymap.set('i', '<C-b>', scroll_up_or_left, { expr = true })

The return a and b or c is a Lua idiom for the (imitation of) ternary operator. Here it means "if scroll is scheduled, do nothing else, otherwise act like an arrow key" (the expr = true in mappings is important).

[dalugm]

thanks, it actually works!