nixos/config/wezterm/status.lua

local wezterm = require("wezterm")

-- Equivalent to POSIX basename(3)
-- Given "/foo/bar" returns "bar"
-- Given "c:\\foo\\bar" returns "bar"
function basename(s)
	return string.gsub(s, "(.*[/\\])(.*)", "%2")
end

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

	-- Show current active key table
	local name = window:active_key_table()
	if name then
		name = "TABLE: " .. name
		table.insert(cells, name)
	end

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

	-- 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

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

	-- Define various colours used from active colourscheme
	local tab_bar_bg = "#333333" -- Not defined in scheme for some reason...
	local tab_bg = scheme.foreground
	local tab_fg = scheme.background

	-- The elements to be formatted
	local elements = {}

	table.insert(elements, { Foreground = { Color = tab_bg } })
	table.insert(elements, { Background = { Color = tab_bar_bg } })
	table.insert(elements, { Text = SOLID_LEFT_ARROW })
	while #cells > 1 do
		local text = table.remove(cells, 1)
		table.insert(elements, { Foreground = { Color = tab_fg } })
		table.insert(elements, { Background = { Color = tab_bg } })
		table.insert(elements, { Text = " " .. text .. " " })
		table.insert(elements, { Foreground = { Color = tab_fg } })
		table.insert(elements, { Text = LEFT_ARROW })
	end
	local text = table.remove(cells, 1)
	table.insert(elements, { Foreground = { Color = tab_fg } })
	table.insert(elements, { Background = { Color = tab_bg } })
	table.insert(elements, { Text = " " .. text .. " " })

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