local ensure_packer = function()
  local fn = vim.fn
  local install_path = fn.stdpath('data') .. '/site/pack/packer/start/packer.nvim'
  if fn.empty(fn.glob(install_path)) > 0 then
    fn.system({ 'git', 'clone', '--depth', '1', 'https://github.com/wbthomason/packer.nvim', install_path })
    vim.cmd [[packadd packer.nvim]]
    return true
  end
  return false
end

local packer_bootstrap = ensure_packer()

return require('packer').startup({ function(use)

  -- packer
  use 'wbthomason/packer.nvim'

  -- brrrrr (in init.lua)
  use 'lewis6991/impatient.nvim'

  --vimp (in mappings.lua)
  use 'svermeulen/vimpeccable'

  --nim
  use 'alaviss/nim.nvim'

  -- golang
  use 'fatih/vim-go'

  -- obsession
  use 'tpope/vim-obsession'

  --rust
  use {
    'simrat39/rust-tools.nvim',
    config = function()
      local rt = require('rust-tools')
      rt.setup({
        server = {
          on_attach = function(_, bufnr)
            -- Hover actions
            vim.keymap.set("n", "<C-space>", rt.hover_actions.hover_actions, { buffer = bufnr })
            -- Code action groups
            vim.keymap.set("n", "<Leader>a", rt.code_action_group.code_action_group, { buffer = bufnr })
          end
        }
      })
    end
  }

  --lsp (in lsp_settings.lua)
  use 'neovim/nvim-lspconfig'
  use 'williamboman/mason-lspconfig'
  use 'williamboman/mason.nvim'
  use 'mfussenegger/nvim-dap'

  -- auto color hex/rgb
  use {
    'norcalli/nvim-colorizer.lua',
    config = function() require('colorizer').setup() end,
  }

  use {
    'mrshmllow/document-color.nvim',
    config = function()
      require('document-color').setup {
        mode = "background",
      }
    end
  }


  -- Markdown preview
  use {
    "iamcco/markdown-preview.nvim",
    run = "cd app && npm install",
    setup = function()
      vim.g.mkdp_filetypes = { "markdown" }
      vim.g.mkdp_markdown_css = os.getenv("XDG_CONFIG_HOME") .. '/nvim/static/custom.css'
      vim.g.mkdp_highlight_css = os.getenv("XDG_CACHE_HOME") .. '/wal/colors.css'
      vim.g.mkdp_browser = 'surf'
      vim.g.mkdp_echo_preview_url = 1
    end,
    ft = { "markdown" }
  }

  use {
    "ellisonleao/glow.nvim",
    config = function()
      require('glow').setup({})
    end
  }

  -- auto pairs
  use {
    'windwp/nvim-autopairs',
    config = function()
      require('nvim-autopairs').setup {}
    end
  }

  -- show git diffs
  use {
    'lewis6991/gitsigns.nvim',
    config = function() require('gitsigns').setup() end
  }

  -- fuzzy finder
  use {
    'nvim-telescope/telescope.nvim',
    branch = '0.1.x',
    requires = {
      'nvim-lua/plenary.nvim',
    }
  }

  -- file explorer
  use {
    'kyazdani42/nvim-tree.lua',
    config = function()
      require('nvim-tree').setup {
        sort_by = "case_sensitive",
        view = {
          adaptive_size = true,
          mappings = {
            list = {
              { key = "u", action = "dir_up" },
            },
          },
        },
        renderer = {
          group_empty = true,
        },
      }
    end
  }

  -- open file at last location
  use {
    'ethanholz/nvim-lastplace',
    config = function()
      require('nvim-lastplace').setup {
        lastplace_open_folds = true
      }
    end
  }

  -- multiple cursors
  use 'mg979/vim-visual-multi'

  -- wrap things inside pairs
  use 'FooSoft/vim-argwrap'

  -- which key
  use {
    "folke/which-key.nvim",
    config = function()
      require("which-key").setup {}
    end
  }

  -- pasting indents
  use {
    'hrsh7th/nvim-pasta',
    config = function()
      require('pasta').setup {
        converters = {
          require('pasta.converters').indentation,
        },
        paste_mode = true,
        next_key = vim.api.nvim_replace_termcodes('<C-p>', true, true, true),
        prev_key = vim.api.nvim_replace_termcodes('<C-n>', true, true, true),
      }
    end
  }

  use {
    "hrsh7th/nvim-cmp",
    requires = {
      { "hrsh7th/cmp-nvim-lsp" },
      { "hrsh7th/cmp-nvim-lua" },
      { "hrsh7th/cmp-buffer" },
      { "hrsh7th/cmp-path" },
      { "hrsh7th/cmp-cmdline" },
      { "L3MON4D3/LuaSnip" },
      { "saadparwaiz1/cmp_luasnip" },
      { "rafamadriz/friendly-snippets" },
      { "f3fora/cmp-spell", { "hrsh7th/cmp-calc" }, { "hrsh7th/cmp-emoji" } },
    },
    config = function()
      require('luasnip.loaders.from_vscode').lazy_load()
      local cmp = require 'cmp'
      cmp.setup({
        snippet = {
          -- REQUIRED - you must specify a snippet engine
          expand = function(args)
            require('luasnip').lsp_expand(args.body) -- For `luasnip` users.
          end,
        },
        window = {
          completion = cmp.config.window.bordered(),
          documentation = cmp.config.window.bordered(),
        },
        mapping = cmp.mapping.preset.insert({
          ['<C-b>'] = cmp.mapping.scroll_docs(-4),
          ['<C-f>'] = cmp.mapping.scroll_docs(4),
          ['<C-Space>'] = cmp.mapping.complete(),
          ['<C-e>'] = cmp.mapping.abort(),
          ['<CR>'] = cmp.mapping.confirm({ select = true }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
        }),
        sources = cmp.config.sources({
          { name = 'nvim_lsp' },
          { name = 'luasnip' },
        }, {
          { name = 'buffer' },
        })
      })

      -- Set configuration for specific filetype.
      cmp.setup.filetype('gitcommit', {
        sources = cmp.config.sources({
          { name = 'cmp_git' }, -- You can specify the `cmp_git` source if you were installed it.
        }, {
          { name = 'buffer' },
        })
      })

      -- Use buffer source for `/` (if you enabled `native_menu`, this won't work anymore).
      cmp.setup.cmdline('/', {
        mapping = cmp.mapping.preset.cmdline(),
        sources = {
          { name = 'buffer' }
        }
      })

      -- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
      cmp.setup.cmdline(':', {
        mapping = cmp.mapping.preset.cmdline(),
        sources = cmp.config.sources({
          { name = 'path' }
        }, {
          { name = 'cmdline' }
        })
      })
    end,
  }

  -- terminal toggler
  use {
    "NvChad/nvterm",
    config = function()
      require("nvterm").setup()
      local toggle_modes = { 'n', 't' }
      local mappings = {
        { toggle_modes, '<leader>th', function() require("nvterm.terminal").toggle('horizontal') end },
        { toggle_modes, '<leader>tv', function() require("nvterm.terminal").toggle('vertical') end },
        { toggle_modes, '<leader>tf', function() require("nvterm.terminal").toggle('float') end },
      }
      local opts = { noremap = true, silent = true }
      for _, mapping in ipairs(mappings) do
        vim.keymap.set(mapping[1], mapping[2], mapping[3], opts)
      end
    end
  }

  --- THEME STUFF
  -- colors
  use {
    'AlphaTechnolog/pywal.nvim',
    as = 'pywal',
    config = function()
      local pywal = require('pywal')
      pywal.setup()
    end
  }

  -- better statusbar
  use {
    'hoob3rt/lualine.nvim',
    requires = { { 'kyazdani42/nvim-web-devicons', opt = true } },
    config = function()
      require('lualine').setup({ options = { theme = 'pywal-nvim' } })
    end,
    after = 'pywal'
  }

  -- better tabs
  use {
    'kdheepak/tabline.nvim',
    requires = { { 'kyazdani42/nvim-web-devicons', opt = true } },
    config = function()
      require('tabline').setup({ options = { theme = 'pywal-nvim' } })
    end,
    after = { 'pywal' }
  }

  -- fwatch updates colors automatically
  use {
    'rktjmp/fwatch.nvim',
    config = function()
      require('fwatch').watch(os.getenv("XDG_CACHE_HOME") .. "/wal/colors",
        { on_event = function()
          vim.defer_fn(function()
            vim.cmd('colorscheme pywal')
          end, 100)
        end })
    end,
    after = 'pywal'
  }

  -- greeter
  use {
    'goolord/alpha-nvim',

    requires = { 'kyazdani42/nvim-web-devicons' },
    config = function()
      local alpha = require('alpha')
      local dashboard = require('alpha.themes.dashboard')
      dashboard.section.header.val = {
        [[ ▄▄▄       ▄▄▄▄     ██████  ███▄    █ ▄▄▄█████▓]],
        [[▒████▄    ▓█████▄ ▒██    ▒  ██ ▀█   █ ▓  ██▒ ▓▒]],
        [[▒██  ▀█▄  ▒██▒ ▄██░ ▓██▄   ▓██  ▀█ ██▒▒ ▓██░ ▒░]],
        [[░██▄▄▄▄██ ▒██░█▀    ▒   ██▒▓██▒  ▐▌██▒░ ▓██▓ ░ ]],
        [[ ▓█   ▓██▒░▓█  ▀█▓▒██████▒▒▒██░   ▓██░  ▒██▒ ░ ]],
        [[ ▒▒   ▓▒█░░▒▓███▀▒▒ ▒▓▒ ▒ ░░ ▒░   ▒ ▒   ▒ ░░   ]],
        [[  ▒   ▒▒ ░▒░▒   ░ ░ ░▒  ░ ░░ ░░   ░ ▒░    ░    ]],
        [[  ░   ▒    ░    ░ ░  ░  ░     ░   ░ ░   ░      ]],
        [[      ░  ░ ░            ░           ░          ]],
        [[                ░                              ]]
      }
      dashboard.section.buttons.val = {
        dashboard.button("e", "  New file", ":ene <BAR> startinsert <CR>"),
        dashboard.button("r", "  Recently used files", ":Telescope oldfiles<CR>"),
        dashboard.button("f", "  Find file", ":Telescope find_files<CR>"),
        dashboard.button("t", "  Find text", ":Telescope live_grep <CR>"),
        dashboard.button("s", "  Settings",
          ":e $HOME/.config/nvim/init.lua | :cd %:p:h | split . | wincmd k | pwd<CR>"),
        dashboard.button("q", "  Quit NVIM", ":qa<CR>"),
      }
      local handle = assert(io.popen('fortune -s'))
      local fortune = handle:read("*all")
      handle:close()
      dashboard.section.footer.val = fortune
      dashboard.section.header.opts.hl = "Title"
      dashboard.section.buttons.opts.hl = "Debug"
      dashboard.section.footer.opts.hl = "Conceal"
      dashboard.config.opts.noautocmd = true
      dashboard.config.opts.setup = function()
        vim.b.lnstatus = "nonumber"
      end
      alpha.setup(dashboard.opts)
    end
  }
  if packer_bootstrap then
    require('packer').sync()
  end

end,
  config = {
    display = {
      open_fn = function()
        return require('packer.util').float({ border = 'single' })
      end
    }
  } })