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-- statusd_linuxbatt.lua
--
-- Public domain
--
-- Uses the /sys/class interface to get battery percentage.
--
-- Use the key "linuxbatt" to get the battery percentage; use
-- "linuxbatt_state" to get a symbol indicating charging "+",
-- discharging "-", or charged " ".
--
-- Now uses lua functions instead of bash, awk, dc. MUCH faster!
--
-- The "bat" option to the statusd settings for linuxbatt modifies which
-- battery we look at.
local defaults = {
update_interval = 15*1000,
bat = 0,
important_threshold = 30,
critical_threshold = 10,
}
local settings = table.join(statusd.get_config("linuxbatt"), defaults)
function linuxbatt_do_find_capacity()
local f = io.open('/sys/class/power_supply/BAT'.. settings.bat ..'/charge_full')
local infofile = f:read('*a')
f:close()
local start_index, end_index, capacity = string.find(infofile, '(%d+)')
return capacity
end
local capacity = linuxbatt_do_find_capacity()
function get_linuxbatt()
local f = io.open('/sys/class/power_supply/BAT'.. settings.bat ..'/charge_now')
local statefile = f:read('*a')
f:close()
local start_index, end_index, remaining = string.find(statefile, '(%d+)')
local percent = math.floor(remaining * 100 / capacity)
f = io.open('/sys/class/power_supply/BAT'.. settings.bat ..'/status')
statefile = f:read('*a')
f:close()
start_index, end_index, statename = string.find(statefile, '(%a+)')
if statename == "Charging" then
return percent, "+"
elseif statename == "Discharging" then
return percent, "-"
else
return percent, " "
end
end
function update_linuxbatt()
local perc, state = get_linuxbatt()
statusd.inform("linuxbatt", tostring(perc))
statusd.inform("linuxbatt_state", state)
if perc < settings.critical_threshold
then statusd.inform("linuxbatt_hint", "critical")
elseif perc < settings.important_threshold
then statusd.inform("linuxbatt_hint", "important")
else statusd.inform("linuxbatt_hint", "normal")
end
linuxbatt_timer:set(settings.update_interval, update_linuxbatt)
end
linuxbatt_timer = statusd.create_timer()
update_linuxbatt()
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