starter/lua/plugins/supertab.lua

return {
  {
    "hrsh7th/nvim-cmp",
    opts = function(_, opts)
      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 cmp = require("cmp")

      opts.mapping = vim.tbl_extend("force", opts.mapping, {
        -- ["<CR>"] = cmp.mapping(function(fallback)
        --   if cmp.visible() then
        --     print("CLOSING")
        --     cmp.close()
        --   else
        --     fallback()
        --   end
        -- end, { "i", "s" }),
        ["<ESC>"] = cmp.mapping(function(fallback)
          if cmp.visible() then
            cmp.close()
          else
            fallback()
          end
        end, { "i", "s" }),
        ["<Tab>"] = cmp.mapping(function(fallback)
          if cmp.visible() then
            -- You could replace select_next_item() with confirm({ select = true }) to get VS Code autocompletion behavior
            --cmp.select_next_item()
            cmp.confirm({ select = true })
          elseif vim.snippet.active({ direction = 1 }) then
            vim.schedule(function()
              vim.snippet.jump(1)
            end)
          elseif has_words_before() then
            cmp.complete()
          else
            fallback()
          end
        end, { "i", "s" }),
        ["<M-Space>"] = cmp.mapping(function(fallback)
          if cmp.visible() then
            -- You could replace select_next_item() with confirm({ select = true }) to get VS Code autocompletion behavior
            --cmp.select_next_item()
            cmp.confirm({ select = true })
          elseif vim.snippet.active({ direction = 1 }) then
            vim.schedule(function()
              vim.snippet.jump(1)
            end)
          elseif has_words_before() then
            cmp.complete()
          elseif vim.api.nvim_get_mode()["mode"] == "i" then
            -- Nothing to do here, but don't fallback
          else
            fallback()
          end
        end, { "i", "s" }),
        ["<S-Tab>"] = cmp.mapping(function(fallback)
          if cmp.visible() then
            cmp.select_prev_item()
          elseif vim.snippet.active({ direction = -1 }) then
            vim.schedule(function()
              vim.snippet.jump(-1)
            end)
          else
            fallback()
          end
        end, { "i", "s" }),
      })
    end,
  },
}