neovim-config/lua/plugins/configs/alpha.lua

local present, alpha = pcall(require, "alpha")

if not present then
  return
end

require("base46").load_highlight "alpha"

local function button(sc, txt, keybind)
  local sc_ = sc:gsub("%s", ""):gsub("SPC", "<leader>")

  local opts = {
    position = "center",
    text = txt,
    shortcut = sc,
    cursor = 5,
    width = 36,
    align_shortcut = "right",
    hl = "AlphaButtons",
  }

  if keybind then
    opts.keymap = { "n", sc_, keybind, { noremap = true, silent = true } }
  end

  return {
    type = "button",
    val = txt,
    on_press = function()
      local key = vim.api.nvim_replace_termcodes(sc_, true, false, true) or ""
      vim.api.nvim_feedkeys(key, "normal", false)
    end,
    opts = opts,
  }
end

-- dynamic header padding
local fn = vim.fn
local marginTopPercent = 0.3
local headerPadding = fn.max { 2, fn.floor(fn.winheight(0) * marginTopPercent) }

local options = {

  header = {
    type = "text",
    val = {
      "   ⣴⣶⣤⡤⠦⣤⣀⣤⠆     ⣈⣭⣿⣶⣿⣦⣼⣆          ",
      "    ⠉⠻⢿⣿⠿⣿⣿⣶⣦⠤⠄⡠⢾⣿⣿⡿⠋⠉⠉⠻⣿⣿⡛⣦       ",
      "          ⠈⢿⣿⣟⠦ ⣾⣿⣿⣷    ⠻⠿⢿⣿⣧⣄     ",
      "           ⣸⣿⣿⢧ ⢻⠻⣿⣿⣷⣄⣀⠄⠢⣀⡀⠈⠙⠿⠄    ",
      "          ⢠⣿⣿⣿⠈    ⣻⣿⣿⣿⣿⣿⣿⣿⣛⣳⣤⣀⣀   ",
      "   ⢠⣧⣶⣥⡤⢄ ⣸⣿⣿⠘  ⢀⣴⣿⣿⡿⠛⣿⣿⣧⠈⢿⠿⠟⠛⠻⠿⠄  ",
      "  ⣰⣿⣿⠛⠻⣿⣿⡦⢹⣿⣷   ⢊⣿⣿⡏  ⢸⣿⣿⡇ ⢀⣠⣄⣾⠄   ",
      " ⣠⣿⠿⠛ ⢀⣿⣿⣷⠘⢿⣿⣦⡀ ⢸⢿⣿⣿⣄ ⣸⣿⣿⡇⣪⣿⡿⠿⣿⣷⡄  ",
      " ⠙⠃   ⣼⣿⡟  ⠈⠻⣿⣿⣦⣌⡇⠻⣿⣿⣷⣿⣿⣿ ⣿⣿⡇ ⠛⠻⢷⣄ ",
      "      ⢻⣿⣿⣄   ⠈⠻⣿⣿⣿⣷⣿⣿⣿⣿⣿⡟ ⠫⢿⣿⡆     ",
      "       ⠻⣿⣿⣿⣿⣶⣶⣾⣿⣿⣿⣿⣿⣿⣿⣿⡟⢀⣀⣤⣾⡿⠃     ",
    },
    opts = {
      position = "center",
      hl = "AlphaHeader",
    },
  },

  buttons = {
    type = "group",
    val = {
      button("SPC f f", "  Find File  ", ":Telescope find_files<CR>"),
      button("SPC f o", "  Recent File  ", ":Telescope oldfiles<CR>"),
      button("SPC f w", "  Find Word  ", ":Telescope live_grep<CR>"),
      button("SPC b m", "  Bookmarks  ", ":Telescope marks<CR>"),
      button("SPC t h", "  Themes  ", ":Telescope themes<CR>"),
      button("SPC e s", "  Settings", ":e $MYVIMRC | :cd %:p:h <CR>"),
    },
    opts = {
      spacing = 1,
    },
  },

  headerPaddingTop = { type = "padding", val = headerPadding },
  headerPaddingBottom = { type = "padding", val = 2 },
}

options = require("core.utils").load_override(options, "goolord/alpha-nvim")

alpha.setup {
  layout = {
    options.headerPaddingTop,
    options.header,
    options.headerPaddingBottom,
    options.buttons,
  },
  opts = {},
}