nvim/lua/settings/completion.lua

-- Completion

local completion = {}
local cmp = require('cmp')
local lspkind = require('lspkind')

vim.opt.shortmess:append 'c'

cmp.setup({
	snippet = {
		expand = function(args)
			require('luasnip').lsp_expand(args.body)
		end,
	},
	mapping = cmp.mapping.preset.insert({
		["<C-n>"] = cmp.mapping.select_next_item { behavior = cmp.SelectBehavior.Insert },
		["<C-p>"] = cmp.mapping.select_prev_item { behavior = cmp.SelectBehavior.Insert },
		['<C-b>'] = cmp.mapping(cmp.mapping.scroll_docs(-4), { 'i', 'c' }),
		['<C-f>'] = cmp.mapping(cmp.mapping.scroll_docs(4), { 'i', 'c' }),
		['<C-s>'] = cmp.mapping(cmp.mapping.complete(), { 'i', 'c' }),
		['<C-y>'] = cmp.mapping.confirm({
			behavior = cmp.ConfirmBehavior.Insert,
			select = true
		}),
		['<C-e>'] = cmp.mapping({
			i = cmp.mapping.abort(),
			c = cmp.mapping.close(),
		}),
		['<CR>'] = cmp.mapping.confirm({ select = true }),
	}),
	sources = cmp.config.sources({
		{ name = 'nvim_lua' },
		{ name = 'nvim_lsp' },
		{ name = 'path' },
		{ name = 'luasnip' },
		{ name = 'nvim_lsp_signature_help' },
	}, {
		{ name = 'buffer', keyword_length = 5 },
	}),
	formatting = {
		format = lspkind.cmp_format {
			with_text = true,
			menu = {
				buffer = "[buf]",
				nvim_lsp = "[LSP]",
				nvim_lua = "[api]",
				path = "[path]",
				luasnip = "[snip]",
			}
		}
	}
})

-- Use buffer source for `/` (basically search words in buffer)
cmp.setup.cmdline('/', {
	sources = {
		{ name = 'buffer' }
	}
})

-- Use cmdline & path source for ':'
cmp.setup.cmdline(':', {
	sources = cmp.config.sources({
		{ name = 'path' }
	}, {
		{ name = 'cmdline' }
	})
})

-- autopair
require('nvim-autopairs').setup {}

return completion