nvim/lua/user/cmp.lua

local cmp_status_ok, cmp = pcall(require, "cmp")
if not cmp_status_ok then
  return
end

local snip_status_ok, luasnip = pcall(require, "luasnip")
if not snip_status_ok then
  return
end

local check_backspace = function()
  local col = vim.fn.col "." - 1
  return col == 0 or vim.fn.getline("."):sub(col, col):match "%s"
end

--   פּ ﯟ   some other good icons
local kind_icons = {
  Text = "",
  Method = "m",
  Function = "",
  Constructor = "",
  Field = "",
  Variable = "",
  Class = "",
  Interface = "",
  Module = "",
  Property = "",
  Unit = "",
  Value = "",
  Enum = "",
  Keyword = "",
  Snippet = "",
  Color = "",
  File = "",
  Reference = "",
  Folder = "",
  EnumMember = "",
  Constant = "",
  Struct = "",
  Event = "",
  Operator = "",
  TypeParameter = "",
}
-- find more here: https://www.nerdfonts.com/cheat-sheet

cmp.setup {
	-- preselect = cmp.PreselectMode.None,
  completion = {
    -- autocomplete = {
    --   cmp.TriggerEvent.TextChanged,
    --   cmp.TriggerEvent.InsertEnter,
    -- },
    completeopt = "menu,noselect",
    -- completeopt = "menuone,noinsert,noselect",
    keyword_length = 1,
  },
  snippet = {
    expand = function(args)
      luasnip.lsp_expand(args.body) -- For `luasnip` users.
    end,
  },
  mapping = {
    ["<C-k>"] = cmp.mapping(cmp.mapping.select_prev_item(), { "i", "c" }),
    ["<C-j>"] = cmp.mapping(cmp.mapping.select_next_item(), { "i", "c" }),
    ["<CR>"] = cmp.mapping.confirm({ select = false }),
      -- Set `select` to `false` to only confirm selected
    ["<Tab>"] = cmp.mapping(function(fallback)
      if luasnip.expandable() then
        luasnip.expand()
      elseif luasnip.expand_or_jumpable() then
        luasnip.expand_or_jump()
      elseif check_backspace() then
        fallback()
      else
        fallback()
      end
    end, {
      "i",
      "s",
    }),
    ["<S-Tab>"] = cmp.mapping(function(fallback)
      -- if cmp.visible() then
      --   cmp.select_prev_item()
      if luasnip.jumpable(-1) then
        luasnip.jump(-1)
      else
        fallback()
      end
    end, {
      "i",
      "s",
    }),
  },
  formatting = {
    fields = { "kind", "abbr", "menu" },
    format = function(entry, vim_item)
      -- Kind icons
      vim_item.kind = string.format("%s", kind_icons[vim_item.kind])
      -- 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
      vim_item.menu = ({
        -- omni = "[VimTex]",
        omni = (vim.inspect(vim_item.menu):gsub('%"', "")),
        nvim_lsp = "[LSP]",
        luasnip = "[Snippet]",
        buffer = "[Buffer]",
        spell = "[Spell]",
        latex_symbols = "[Symbols]",
        cmdline = "[CMD]",
        path = "[Path]",
      })[entry.source.name]
      return vim_item
    end,
  },
  sources = cmp.config.sources({
    { name = "nvim_lsp" },
    { name = "luasnip" },
    { name = "omni" },
    { name = "buffer", keyword_length = 3 },
    { name = "spell",
      keyword_length = 4,
      option = {
          keep_all_entries = false,
          enable_in_context = function()
              return true
          end
      },
    },
    { name = "latex_symbols",
      filetype = { "tex", "latex" },
      option = { cache = true }, -- avoids reloading each time
    },
    { name = "path" },
  }),
  confirm_opts = {
    behavior = cmp.ConfirmBehavior.Replace,
    select = false,
  },
  view = {
    entries = 'custom',
  },
  window = {
    documentation = {
      border = { "╭", "─", "╮", "│", "╯", "─", "╰", "│" },
    }
  },
  performance = {
     trigger_debounce_time = 500,
     throttle = 550,
     fetching_timeout = 80,
  },
}


-- TODO zotero import
    -- { name = "cmp_zotcite",
    --   filetype = { "tex", "latex", "pandoc", "markdown", "rmd", "quarto" },
    -- },
      -- could use but seems like vimtex has access to .bib

-- `/` cmdline setup.
cmp.setup.cmdline('/', {
  mapping = cmp.mapping.preset.cmdline(),
  sources = {
    {name = 'buffer'}
  }
})


-- `:` cmdline setup.
cmp.setup.cmdline(':', {
  mapping = cmp.mapping.preset.cmdline(),
  sources = {
    {name = 'path'},
    {name = 'cmdline'}
  }
})


-- Toggle cmp entrirely
vim.g.cmptoggle = true -- nvim-cmp off by default if false

local cmp = require('cmp')
cmp.setup {
  enabled = function()
    return vim.g.cmptoggle
  end
}

-- TODO was trying to get <C-j>, <C-k> to work in the command line

  -- mapping = cmp.mapping.preset.cmdline({
  --   ["<C-j>"] = cmp.mapping.select_next_item({ behavior = cmp.SelectBehavior.Insert }),
  --   ["<C-k>"] = cmp.mapping.select_prev_item({ behavior = cmp.SelectBehavior.Insert }),
  --   ["<CR>"] = cmp.mapping.confirm({ select = true }),
    -- ['<C-j>'] = cmp.mapping(cmp.mapping.select_next_item()),
    -- ['<C-k>'] = cmp.mapping(cmp.mapping.select_prev_item()),
  -- }),