dotfiles/dot_config/nvim/lua/plugins/cmp.lua

-- 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
--
return {
  -- snippets
  {
    "L3MON4D3/LuaSnip",
    dependencies = {
      "rafamadriz/friendly-snippets",
      config = function()
        require("luasnip.loaders.from_vscode").lazy_load()
      end,
    },
    opts = {
      history = true,
      delete_check_events = "TextChanged",
    },
    -- stylua: ignore
    keys = {
      {
        "<tab>",
        function()
          return require("luasnip").jumpable(1) and "<Plug>luasnip-jump-next" or "<tab>"
        end,
        expr = true, silent = true, mode = "i",
      },
      { "<tab>", function() require("luasnip").jump(1) end, mode = "s" },
      { "<s-tab>", function() require("luasnip").jump(-1) end, mode = { "i", "s" } },
    },
  },

  {
    "hrsh7th/nvim-cmp",
    version = false,
    event = "InsertEnter",
    config = function()
      local cmp = require("cmp")
      local cmp_under_comparator = require("cmp-under-comparator")
      local lspkind = require("lspkind")
      local luasnip = require("luasnip")

      cmp.setup({
        snippet = {
          expand = function(args)
            luasnip.lsp_expand(args.body)
          end,
        },
        window = {
          completion = cmp.config.window.bordered(),
          documentation = cmp.config.window.bordered(),
        },
        mapping = cmp.mapping.preset.insert({
          ["<A-k>"] = cmp.mapping(cmp.mapping.select_prev_item(), { "i", "c" }),
          ["<A-j>"] = cmp.mapping(cmp.mapping.select_next_item(), { "i", "c" }),
          ["<A-p>"] = cmp.mapping.scroll_docs(-4),
          ["<A-n>"] = cmp.mapping.scroll_docs(4),
          ["<C-Space>"] = cmp.mapping.complete({}),
          ["<C-e>"] = cmp.mapping.abort(),
          ["<CR>"] = cmp.mapping.confirm({ select = true }),
          --   ["<Tab>"] = cmp.mapping(function(fallback)
          --     if cmp.visible() then
          --       cmp.select_next_item()
          --     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 = "nvim_lua" },
          { name = "luasnip" },
        }, {
          { name = "buffer" },
          { name = "path" },
        }),
        sorting = {
          comparators = {
            cmp.config.compare.offset,
            cmp.config.compare.exact,
            cmp.config.compare.score,
            cmp_under_comparator.under,
            cmp.config.compare.kind,
            cmp.config.compare.sort_text,
            cmp.config.compare.length,
            cmp.config.compare.order,
          },
        },
        formatting = {
          format = lspkind.cmp_format({
            mode = "symbol",
            maxwidth = 30,
            ellipsis_char = "…",
          }),
        },
      })

      cmp.setup.cmdline({ "/", "?" }, {
        mapping = cmp.mapping.preset.cmdline(),
        sources = {
          { name = "buffer" },
        },
      })

      cmp.setup.cmdline(":", {
        mapping = cmp.mapping.preset.cmdline(),
        sources = cmp.config.sources({
          { name = "path" },
        }, {
          { name = "cmdline" },
        }),
      })
    end,
    dependencies = {
      "hrsh7th/cmp-buffer",
      "hrsh7th/cmp-path",
      "hrsh7th/cmp-nvim-lsp",
      "hrsh7th/cmp-nvim-lua",
      "hrsh7th/cmp-cmdline",
      "saadparwaiz1/cmp_luasnip",
      "lukas-reineke/cmp-under-comparator",
    },
  },
}