neovimconfig/lua/plugin/nvim-cmp.lua

return {

    -- snippets
    {
        "L3MON4D3/LuaSnip",
        lazy = true,
        dependencies = {
            "rafamadriz/friendly-snippets",
            config = function()
                require("luasnip.loaders.from_vscode").lazy_load()
                vim.api.nvim_set_hl(0, "PmenuSel", { fg = 'NONE', bg = '#141617' })
                vim.api.nvim_set_hl(0, "Pmenu", { fg = 'NONE', bg = '#1d2021' })
                vim.api.nvim_set_hl(0, "CmpItemMenu", { fg = 'NONE', bg = '#141617' })
                vim.api.nvim_set_hl(0, "CmpItemMenuDefault", { fg = 'NONE', bg = '#141617' })
                vim.api.nvim_set_hl(0, "CmpItemKindFunction", { fg = '#d3869b', bg = 'NONE', italic = true })
                vim.api.nvim_set_hl(0, "CmpItemKindSnippet", { fg = '#d8a657', bg = 'NONE', italic = true })
                vim.api.nvim_set_hl(0, "CmpItemKindText", { fg = '#ddc7a1', bg = 'NONE', italic = true })
                vim.api.nvim_set_hl(0, "CmpItemKindVariable", { fg = '#7daea3', bg = 'NONE', italic = true })
            end,
        },
    },

    -- completion
    {
        "hrsh7th/nvim-cmp",
        version = false,
        event = {
            -- "InsertEnter",
            -- "CmdlineEnter",
            "BufWinEnter",
        },
        dependencies = {
            "hrsh7th/cmp-nvim-lsp",
            "hrsh7th/cmp-buffer",
            "hrsh7th/cmp-path",
            "hrsh7th/cmp-cmdline",
            "saadparwaiz1/cmp_luasnip",
        },
        opts = function()
            -- Set up nvim-cmp with luasnip
            local kind_icons = {
                Text = "",
                Method = "",
                Function = "",
                Constructor = "",
                Field = "",
                Variable = "",
                Class = "ﴯ",
                Interface = "",
                Module = "",
                Property = "ﰠ",
                Unit = "",
                Value = "",
                Enum = "",
                Keyword = "",
                Snippet = "",
                Color = "",
                File = "",
                Reference = "",
                Folder = "",
                EnumMember = "",
                Constant = "",
                Struct = "",
                Event = "",
                Operator = "",
                TypeParameter = ""
            }

            local has_words_before = function()
                unpack = unpack or table.unpack
                local line, col = unpack(vim.api.nvim_win_get_cursor(0))
                return col ~= 0 and
                    vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match("%s") == nil
            end

            local luasnip = require("luasnip")
            local cmp = require("cmp")

            return {
                formatting = {
                    format = function(entry, vim_item)
                        -- Kind icons
                        vim_item.kind = string.format('%s %s', kind_icons[vim_item.kind], vim_item.kind) -- This concatonates the icons with the name of the item kind
                        -- Source
                        vim_item.menu = ({
                            -- buffer = "[Buffer]",
                            -- nvim_lsp = "[LSP]",
                            -- luasnip = "[LuaSnip]",
                            -- nvim_lua = "[Lua]",
                            -- latex_symbols = "[LaTeX]",
                            buffer = "",
                            nvim_lsp = "",
                            luasnip = "",
                            nvim_lua = "",
                            latex_symbols = "",
                        })[entry.source.name]
                        return vim_item
                    end
                },
                snippet = {
                    -- REQUIRED - you must specify a snippet engine
                    expand = function(args)
                        -- vim.fn["vsnip#anonymous"](args.body) -- For `vsnip` users.
                        require('luasnip').lsp_expand(args.body) -- For `luasnip` users.
                        -- require('snippy').expand_snippet(args.body) -- For `snippy` users.
                        -- vim.fn["UltiSnips#Anon"](args.body) -- For `ultisnips` users.
                    end,
                },
                -- completion = {
                --     autocomplete = false,
                -- },

                window = {
                    completion = cmp.config.window.bordered(),
                    documentation = cmp.config.window.bordered(),
                },
                mapping = cmp.mapping.preset.insert({
                    ['<C-b>'] = cmp.mapping.scroll_docs(-4),
                    ['<C-f>'] = cmp.mapping.scroll_docs(4),
                    -- ['<C-Space>'] = cmp.mapping.complete(),
                    -- ['<C-e>'] = cmp.mapping.abort(),
                    ['<C-e>'] = cmp.mapping(function(fallback)
                        if cmp.visible() then
                            cmp.abort()
                        else
                            cmp.complete()
                        end
                    end),
                    ['<CR>'] = cmp.mapping.confirm({ select = false }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
                    ["<Tab>"] = cmp.mapping(function(fallback)
                        if cmp.visible() then
                            cmp.select_next_item()
                            -- You could replace the expand_or_jumpable() calls with expand_or_locally_jumpable()
                            -- they way you will only jump inside the snippet region
                        elseif luasnip.expand_or_jumpable() then
                            luasnip.expand_or_jump()
                        elseif has_words_before() then
                            cmp.complete()
                        else
                            fallback()
                        end
                    end, { "i", "s" }),
                    ["<S-Tab>"] = cmp.mapping(function(fallback)
                        if cmp.visible() then
                            cmp.select_prev_item()
                        elseif luasnip.jumpable(-1) then
                            luasnip.jump(-1)
                        else
                            fallback()
                        end
                    end, { "i", "s" }),
                }),
                sources = cmp.config.sources({
                    { name = 'nvim_lsp' },
                    -- { name = 'vsnip' }, -- For vsnip users.
                    { name = 'luasnip' }, -- For luasnip users.
                    -- { name = 'ultisnips' }, -- For ultisnips users.
                    -- { name = 'snippy' }, -- For snippy users.
                    {
                        name = 'buffer',
                        option = {
                            get_bufnrs = function()
                                return vim.api.nvim_list_bufs()
                            end
                        },
                    },
                }, {
                }),
                -- Set configuration for specific filetype.
                cmp.setup.filetype('gitcommit', {
                    sources = cmp.config.sources({
                        { name = 'cmp_git' }, -- You can specify the `cmp_git` source if you were installed it.
                    }, {
                        { 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' }
                    })
                }),
            }
        end,
    }
}