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---------------------------------------------------
-- Licensed under the GNU General Public License v2
-- * (c) 2010, Adrian C. <anrxc@sysphere.org>
---------------------------------------------------
-- {{{ Grab environment
local tonumber = tonumber
local io = { open = io.open }
local setmetatable = setmetatable
local math = {
min = math.min,
floor = math.floor
}
local string = {
find = string.find,
match = string.match,
format = string.format
}
-- }}}
-- Batproc: provides state, charge, and remaining time for a requested battery using procfs
-- vicious.contrib.batproc
local batproc = {}
-- {{{ Battery widget type
local function worker(format, batid)
local battery_state = {
["full"] = "↯",
["unknown"] = "⌁",
["charged"] = "↯",
["charging"] = "+",
["discharging"] = "-"
}
-- Get /proc/acpi/battery info
local f = io.open("/proc/acpi/battery/"..batid.."/info")
-- Handler for incompetent users
if not f then return {battery_state["unknown"], 0, "N/A"} end
local infofile = f:read("*all")
f:close()
-- Check if the battery is present
if infofile == nil or string.find(infofile, "present:[%s]+no") then
return {battery_state["unknown"], 0, "N/A"}
end
-- Get capacity information
local capacity = string.match(infofile, "last full capacity:[%s]+([%d]+).*")
-- Get /proc/acpi/battery state
local f = io.open("/proc/acpi/battery/"..batid.."/state")
local statefile = f:read("*all")
f:close()
-- Get state information
local state = string.match(statefile, "charging state:[%s]+([%a]+).*")
local state = battery_state[state] or battery_state["unknown"]
-- Get charge information
local rate = string.match(statefile, "present rate:[%s]+([%d]+).*")
local remaining = string.match(statefile, "remaining capacity:[%s]+([%d]+).*")
-- Calculate percentage (but work around broken BAT/ACPI implementations)
local percent = math.min(math.floor(remaining / capacity * 100), 100)
-- Calculate remaining (charging or discharging) time
if state == "+" then
timeleft = (tonumber(capacity) - tonumber(remaining)) / tonumber(rate)
elseif state == "-" then
timeleft = tonumber(remaining) / tonumber(rate)
else
return {state, percent, "N/A"}
end
local hoursleft = math.floor(timeleft)
local minutesleft = math.floor((timeleft - hoursleft) * 60 )
local time = string.format("%02d:%02d", hoursleft, minutesleft)
return {state, percent, time}
end
-- }}}
return setmetatable(batproc, { __call = function(_, ...) return worker(...) end })
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