feat: improved alpha dashboard theme

modules/dashboard/alpha.nix

@@ -17,8 +17,205 @@ in {
       "alpha-nvim"
     ];
 
+    # the credit for this configuration goes to https://github.com/Rishabh672003
+    # good work, honestly
     vim.luaConfigRC.alpha = nvim.dag.entryAnywhere ''
-      require'alpha'.setup(require'alpha.themes.startify'.config)
+      local alpha = require("alpha")
+      local plenary_path = require("plenary.path")
+      local dashboard = require("alpha.themes.dashboard")
+      local cdir = vim.fn.getcwd()
+      local if_nil = vim.F.if_nil
+
+      local nvim_web_devicons = {
+      	enabled = true,
+      	highlight = true,
+      }
+
+      local function get_extension(fn)
+      	local match = fn:match("^.+(%..+)$")
+      	local ext = ""
+      	if match ~= nil then
+      		ext = match:sub(2)
+      	end
+      	return ext
+      end
+
+      local function icon(fn)
+      	local nwd = require("nvim-web-devicons")
+      	local ext = get_extension(fn)
+      	return nwd.get_icon(fn, ext, { default = true })
+      end
+
+      local function file_button(fn, sc, short_fn)
+      	short_fn = short_fn or fn
+      	local ico_txt
+      	local fb_hl = {}
+
+      	if nvim_web_devicons.enabled then
+      		local ico, hl = icon(fn)
+      		local hl_option_type = type(nvim_web_devicons.highlight)
+      		if hl_option_type == "boolean" then
+      			if hl and nvim_web_devicons.highlight then
+      				table.insert(fb_hl, { hl, 0, 3 })
+      			end
+      		end
+      		if hl_option_type == "string" then
+      			table.insert(fb_hl, { nvim_web_devicons.highlight, 0, 3 })
+      		end
+      		ico_txt = ico .. "  "
+      	else
+      		ico_txt = ""
+      	end
+      	local file_button_el = dashboard.button(sc, ico_txt .. short_fn, "<cmd>e " .. fn .. " <CR>")
+      	local fn_start = short_fn:match(".*[/\\]")
+      	if fn_start ~= nil then
+      		table.insert(fb_hl, { "Comment", #ico_txt - 2, #fn_start + #ico_txt })
+      	end
+      	file_button_el.opts.hl = fb_hl
+      	return file_button_el
+      end
+
+      local default_mru_ignore = { "gitcommit" }
+
+      local mru_opts = {
+      	ignore = function(path, ext)
+      		return (string.find(path, "COMMIT_EDITMSG")) or (vim.tbl_contains(default_mru_ignore, ext))
+      	end,
+      }
+
+      --- @param start number
+      --- @param cwd string optional
+      --- @param items_number number optional number of items to generate, default = 10
+      local function mru(start, cwd, items_number, opts)
+      	opts = opts or mru_opts
+      	items_number = if_nil(items_number, 15)
+
+      	local oldfiles = {}
+      	for _, v in pairs(vim.v.oldfiles) do
+      		if #oldfiles == items_number then
+      			break
+      		end
+      		local cwd_cond
+      		if not cwd then
+      			cwd_cond = true
+      		else
+      			cwd_cond = vim.startswith(v, cwd)
+      		end
+      		local ignore = (opts.ignore and opts.ignore(v, get_extension(v))) or false
+      		if (vim.fn.filereadable(v) == 1) and cwd_cond and not ignore then
+      			oldfiles[#oldfiles + 1] = v
+      		end
+      	end
+      	local target_width = 35
+
+      	local tbl = {}
+      	for i, fn in ipairs(oldfiles) do
+      		local short_fn
+      		if cwd then
+      			short_fn = vim.fn.fnamemodify(fn, ":.")
+      		else
+      			short_fn = vim.fn.fnamemodify(fn, ":~")
+      		end
+
+      		if #short_fn > target_width then
+      			short_fn = plenary_path.new(short_fn):shorten(1, { -2, -1 })
+      			if #short_fn > target_width then
+      				short_fn = plenary_path.new(short_fn):shorten(1, { -1 })
+      			end
+      		end
+
+      		local shortcut = tostring(i + start - 1)
+
+      		local file_button_el = file_button(fn, shortcut, short_fn)
+      		tbl[i] = file_button_el
+      	end
+      	return {
+      		type = "group",
+      		val = tbl,
+      		opts = {},
+      	}
+      end
+
+      local default_header = {
+      	type = "text",
+      	val = {
+      		[[███    ██ ███████  ██████  ██    ██ ██ ███    ███]],
+      		[[████   ██ ██      ██    ██ ██    ██ ██ ████  ████]],
+      		[[██ ██  ██ █████   ██    ██ ██    ██ ██ ██ ████ ██]],
+      		[[██  ██ ██ ██      ██    ██  ██  ██  ██ ██  ██  ██]],
+      		[[██   ████ ███████  ██████    ████   ██ ██      ██]],
+
+      		-- [[                               __                ]],
+      		-- [[  ___     ___    ___   __  __ /\_\    ___ ___    ]],
+      		-- [[ / _ `\  / __`\ / __`\/\ \/\ \\/\ \  / __` __`\  ]],
+      		-- [[/\ \/\ \/\  __//\ \_\ \ \ \_/ |\ \ \/\ \/\ \/\ \ ]],
+      		-- [[\ \_\ \_\ \____\ \____/\ \___/  \ \_\ \_\ \_\ \_\]],
+      		-- [[ \/_/\/_/\/____/\/___/  \/__/    \/_/\/_/\/_/\/_/]],
+      	},
+      	opts = {
+      		position = "center",
+      		hl = "Type",
+      		-- wrap = "overflow";
+      	},
+      }
+
+      local section_mru = {
+      	type = "group",
+      	val = {
+      		{
+      			type = "text",
+      			val = "Recent files",
+      			opts = {
+      				hl = "SpecialComment",
+      				shrink_margin = false,
+      				position = "center",
+      			},
+      		},
+      		{ type = "padding", val = 1 },
+      		{
+      			type = "group",
+      			val = function()
+      				return { mru(0, cdir) }
+      			end,
+      			opts = { shrink_margin = false },
+      		},
+      	},
+      }
+
+      local buttons = {
+      	type = "group",
+      	val = {
+      		{ type = "text", val = "Quick links", opts = { hl = "SpecialComment", position = "center" } },
+      		{ type = "padding", val = 1 },
+      		dashboard.button("e", "  New file", "<cmd>ene<CR>"),
+      		dashboard.button("SPC f", "  Find file"),
+      		dashboard.button("SPC F", "  Live grep"),
+      		dashboard.button("SPC p", "  Projects"),
+      		dashboard.button("q", "  Quit", "<cmd>qa<CR>"),
+      	},
+      	position = "center",
+      }
+
+      local config = {
+      	layout = {
+      		{ type = "padding", val = 2 },
+      		default_header,
+      		{ type = "padding", val = 2 },
+      		section_mru,
+      		{ type = "padding", val = 2 },
+      		buttons,
+      	},
+      	opts = {
+      		margin = 5,
+      		setup = function()
+      			vim.cmd([[
+                  autocmd alpha_temp DirChanged * lua require('alpha').redraw()
+                  ]])
+      		end,
+      	},
+      }
+
+      alpha.setup(config)
     '';
   };
 }