neovim/lua/plugins/cmp.lua

-- Completion plugin config

vim.opt.completeopt = 'menuone,noselect'

local cmp = require('cmp')
local cmp_kinds = {
    Text = ' ',
    Method = '󰊕 ',
    Function = '󰊕 ',
    Constructor = ' ',
    Field = ' ',
    Variable = ' ',
    Class = ' ',
    Interface = ' ',
    Module = ' ',
    Property = ' ',
    Unit = ' ',
    Value = ' ',
    Enum = ' ',
    Keyword = ' ',
    Snippet = ' ',
    Color = ' ',
    File = ' ',
    Reference = ' ',
    Folder = ' ',
    EnumMember = ' ',
    Constant = ' ',
    Struct = ' ',
    Event = ' ',
    Operator = ' ',
    TypeParameter = ' ',
}

cmp.setup({
    formatting = {
        format = function(entry, vim_item)
            -- Kind icons
            vim_item.kind = string.format('%s %s', cmp_kinds[vim_item.kind], vim_item.kind)
            vim_item.menu = ({
                buffer = "[Buffer]",
                nvim_lsp = "[LSP]",
                luasnip = "[LuaSnip]",
                nvim_lua = "[Lua]",
                latex_symbols = "[LaTeX]",
            })[entry.source.name]
            return vim_item
        end
    },
    snippet = {
        expand = function(args)
            local luasnip = require("luasnip")
            if not luasnip then
                return
            end
            luasnip.lsp_expand(args.body)
        end,
    },
    window = {
        completion = {
            border = nil,
        },
        documentation = {
            border = nil,
            max_height = 2000,
        }
    },
    completion = {
        autocomplete = false,
    },
    mapping = cmp.mapping.preset.insert({
        ['<C-b>'] = cmp.mapping.scroll_docs(-4),
        ['<C-f>'] = cmp.mapping.scroll_docs(4),
        ['<C-x><C-o>'] = cmp.mapping.complete(),
        ['<C-e>'] = cmp.mapping.abort(),
        -- Accept currently selected item.
        -- Set `select` to `false` to only confirm explicitly selected items.
        ['<CR>'] = cmp.mapping.confirm({ select = false }),
    }),
    sources = cmp.config.sources(
        {
            { name = 'nvim_lsp' },
            { name = 'luasnip' },
        },
        {
            { name = 'buffer' },
        }
    )
})

-- Set configuration for specific filetype.
cmp.setup.filetype('gitcommit', {
    sources = cmp.config.sources({
        { name = 'git' },
    }, {
        { name = 'buffer' },
    })
})

-- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline({ '/', '?' }, {
    mapping = cmp.mapping.preset.cmdline(),
    sources = {
        { name = 'buffer' }
    }
})

-- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline(':', {
    mapping = cmp.mapping.preset.cmdline(),
    sources = cmp.config.sources({
        { name = 'path' }
    }, {
        { name = 'cmdline' }
    })
})