dotfiles/nvim/lua/config/cmp.lua

-- Setup nvim-cmp.
local cmp = require "cmp"
local lspkind = require("lspkind")
local capabilities = require('cmp_nvim_lsp').default_capabilities()

local has_words_before = function()
    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 feedkey = function(key, mode)
    vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes(key, true, true, true),
                          mode, true)
end


require'lspconfig'.sourcekit.setup {
  capabilities = capabilities
}

lspkind.init({
    symbol_map = {
        Text = "",
        Method = "",
        Function = "",
        Constructor = "",
        Field = "ﰠ",
        Variable = "",
        Class = "ﴯ",
        Interface = "",
        Module = "",
        Property = "ﰠ",
        Unit = "塞",
        Value = "",
        Enum = "",
        Keyword = "",
        Snippet = "",
        Color = "",
        File = "",
        Reference = "",
        Folder = "",
        EnumMember = "",
        Constant = "",
        Struct = "פּ",
        Event = "",
        Operator = "",
        TypeParameter = ""
    }
})

cmp.setup({
    formatting = {
        format = lspkind.cmp_format {
            with_text = false,
            maxwidth = 50,
            menu = {
                buffer = "BUF",
                nvim_lsp = "LSP",
                path = "PATH",
                vsnip = "SNIP",
                calc = "CALC",
                spell = "SPELL",
                emoji = "EMOJI"
            }
        }
    },
    experimental = {native_menu = false, ghost_text = false},
    snippet = {
        expand = function(args)
            vim.fn["vsnip#anonymous"](args.body) -- For `vsnip` users.
        end
    },
    mapping = {
        ["<C-p>"] = cmp.mapping.select_prev_item(),
        ["<C-n>"] = cmp.mapping.select_next_item(),
        ["<C-d>"] = cmp.mapping.scroll_docs(-4),
        ["<C-f>"] = cmp.mapping.scroll_docs(4),
        ["<C-Space>"] = cmp.mapping.complete(),
        ["<C-e>"] = cmp.mapping.close(),
        ["<CR>"] = cmp.mapping.confirm {
            behavior = cmp.ConfirmBehavior.Replace,
            select = false
        },
        ["<Tab>"] = cmp.mapping(function(fallback)
            if cmp.visible() then
                cmp.select_next_item()
            elseif vim.fn["vsnip#available"](1) == 1 then
                feedkey("<Plug>(vsnip-expand-or-jump)", "")
            elseif has_words_before() then
                cmp.complete()
            else
                fallback() -- The fallback function sends a already mapped key. In this case, it's probably `<Tab>`.
            end
        end, {"i", "s"}),
        ["<S-Tab>"] = cmp.mapping(function()
            if cmp.visible() then
                cmp.select_prev_item()
            elseif vim.fn["vsnip#jumpable"](-1) == 1 then
                feedkey("<Plug>(vsnip-jump-prev)", "")
            end
        end, {"i", "s"})
    },
    sources = {
        {name = "nvim_lsp"}, {name = "buffer", keyword_length = 5},
        {name = "vsnip"}, {name = "calc"}, {name = "emoji"}, {name = "spell"},
        {name = "path"}
    }
})

-- Use buffer source for `/`.
cmp.setup.cmdline("/", {sources = {{name = "buffer"}}})

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