my mini neovim config

mini.lua

vim.cmd([[
autocmd BufWritePost mini.lua source <afile> | PackerCompile
set mouse=a
set clipboard=unnamedplus
set nowrap 
set rnu nu
set autoindent
set smartindent	

set tabstop=4 
set softtabstop=4
set shiftwidth=2
set expandtab
set smarttab

set backspace=indent,eol,start
set colorcolumn=60
set scrolloff=7
set updatetime=300

set directory=$HOME/.local/vim/dir/,.

set noswapfile
set nowritebackup

set backupdir=$HOME/.local/vim/backup
set nobackup

set undodir+=$HOME/.local/vim/undodir
set undofile

set wildignore+=*.o,*.obj,.git,*.pyc
set inccommand=split " -- Make substitution work in realtime



inoremap <silent><expr> <C-Space> compe#complete()
inoremap <silent><expr> <CR>      compe#confirm('<CR>')
inoremap <silent><expr> <C-e>     compe#close('<C-e>')
inoremap <silent><expr> <C-f>     compe#scroll({ 'delta': +4 })
inoremap <silent><expr> <C-d>     compe#scroll({ 'delta': -4 })




imap <silent><expr> <C-E> luasnip#choice_active() ? '<Plug>luasnip-next-choice' : '<C-E>'
smap <silent><expr> <C-E> luasnip#choice_active() ? '<Plug>luasnip-next-choice' : '<C-E>'


imap <silent><expr> <Tab> luasnip#expand_or_jumpable() ? '<Plug>luasnip-expand-or-jump' : '<Tab>' 
inoremap <silent> <S-Tab> <cmd>lua require'luasnip'.jump(-1)<Cr>

snoremap <silent> <Tab> <cmd>lua require('luasnip').jump(1)<Cr>
snoremap <silent> <S-Tab> <cmd>lua require('luasnip').jump(-1)<Cr>





xnoremap iu :lua require"treesitter-unit".select()<CR>
xnoremap au :lua require"treesitter-unit".select(true)<CR>
onoremap iu :<c-u>lua require"treesitter-unit".select()<CR>
onoremap au :<c-u>lua require"treesitter-unit".select(true)<CR>

]]) 
--local use = require('packer').use
--require('packer').startup(
--function()
require('packer').startup(function()
  use 'wbthomason/packer.nvim'
  use 'hrsh7th/nvim-compe'
  use 'L3MON4D3/LuaSnip'
  use 'nvim-treesitter/nvim-treesitter'
  use 'David-Kunz/treesitter-unit'
  -- use 'rafamadriz/friendly-snippets'

end)


vim.o.completeopt = "menuone,noselect"

require'compe'.setup {
  enabled = true;
  autocomplete = true;
  debug = false;
  min_length = 1;
  preselect = 'enable';
  throttle_time = 80;
  source_timeout = 200;
  resolve_timeout = 800;
  incomplete_delay = 400;
  max_abbr_width = 100;
  max_kind_width = 100;
  max_menu_width = 100;
  documentation = {
    border = { '', '' ,'', ' ', '', '', '', ' ' }, -- the border option is the same as `|help nvim_open_win|`
    winhighlight = "NormalFloat:CompeDocumentation,FloatBorder:CompeDocumentationBorder",
    max_width = 120,
    min_width = 60,
    max_height = math.floor(vim.o.lines * 0.3),
    min_height = 1,
  };

  source = {
    path = true;
    buffer = true;
    calc = true;
    nvim_lsp = true;
    nvim_lua = true;
    vsnip = false;
    ultisnips = true;
    luasnip = true;
  };
}





local t = function(str) 
    return vim.api.nvim_replace_termcodes(str, true, true, true)
end

local check_back_space = function()
    local col = vim.fn.col('.') - 1
    if col == 0 or vim.fn.getline('.'):sub(col, col):match('%s') then
        return true
    else
        return false
    end
end


_G.tab_complete = function()
    if vim.fn.pumvisible() == 1 then
        return t "<C-n>"
    elseif require("luasnip").expand_or_jumpable() then
        return t "<cmd>lua require'luasnip'.jump(1)<Cr>"
    elseif check_back_space() then
        return t "<Tab>"
    else
        return vim.fn["compe#complete"]()
    end
end

_G.s_tab_complete = function()
    if vim.fn.pumvisible() == 1 then
        return t "<C-p>"
    elseif require("luasnip").jumpable(-1) then
        return t "<cmd>lua require'luasnip'.jump(-1)<CR>"
    else
        return t "<S-Tab>"
    end
end

vim.api.nvim_set_keymap("i", "<Tab>", "v:lua.tab_complete()", {expr = true})
vim.api.nvim_set_keymap("s", "<Tab>", "v:lua.tab_complete()", {expr = true})
vim.api.nvim_set_keymap("i", "<S-Tab>", "v:lua.s_tab_complete()", {expr = true})
vim.api.nvim_set_keymap("s", "<S-Tab>", "v:lua.s_tab_complete()", {expr = true})

require('luasnip.loaders.from_vscode').load()