nixos/config/wezterm/status.lua

local wezterm = require("wezterm")

wezterm.on("update-right-status", function(window, pane)
	-- Each element holds the text for a cell in a "powerline" style << fade
	local cells = {}

	-- I like my date/time in this style: "Wed Mar 3 08:14"
	local date = wezterm.strftime("%a %b %-d %H:%M")
	table.insert(cells, date)

	-- Get current hostname to track which device I'm on
	table.insert(cells, wezterm.hostname())

	-- An entry for each battery (typically 0 or 1 battery)
	for _, b in ipairs(wezterm.battery_info()) do
		table.insert(cells, string.format("%.0f%%", b.state_of_charge * 100))
	end

	-- WIP key table code - not yet used
	local name = window:active_key_table()
	if name then
		name = "TABLE: " .. name
		table.insert(cells, name)
	end

	-- The powerline < symbol
	local LEFT_ARROW = utf8.char(0xe0b3)
	-- The filled in variant of the < symbol
	local SOLID_LEFT_ARROW = utf8.char(0xe0b2)

	-- Color palette for the backgrounds of each cell
	local colors = wezterm.color.gradient({
		colors = {
			"#333333",
			"#926ee4",
			-- "#9ccfd8",
		},
	}, #cells + 1)

	-- Foreground color for the text across the fade
	local text_fg = wezterm.color.get_builtin_schemes()["duskfox"].foreground

	-- The elements to be formatted
	local elements = {}
	-- How many cells have been formatted
	local num_cells = 0

	-- Translate a cell into elements
	local function push(text, is_last)
		local cell_no = num_cells + 1
		table.insert(elements, { Foreground = { Color = text_fg } })
		table.insert(elements, { Background = { Color = colors[cell_no + 1] } })
		table.insert(elements, { Text = " " .. text .. " " })
		if not is_last then
			table.insert(elements, { Foreground = { Color = colors[cell_no + 2] } })
			table.insert(elements, { Text = SOLID_LEFT_ARROW })
		end
		num_cells = num_cells + 1
	end

	table.insert(elements, { Foreground = { Color = colors[num_cells + 2] } })
	table.insert(elements, { Background = { Color = colors[1] } })
	table.insert(elements, { Text = SOLID_LEFT_ARROW })
	while #cells > 0 do
		local cell = table.remove(cells, 1)
		push(cell, #cells == 0)
	end

	window:set_right_status(wezterm.format(elements))
end)