bat_freebsd: adds wear-level between remaining_capacity and present_rate

Signed-off-by: Andreas Geisenhainer <psycorama@datenhalde.de>

widgets/bat_acpi_freebsd.lua

@@ -3,12 +3,15 @@
 --          from the battery
 -----------------------------------------------------
 local setmetatable = setmetatable
-
 local bat_acpi = {}
 
 local function worker(format)
+    local battery = "batt"
+    if warg then
+        battery = warg
+    end
     local bat_info = {}
-    local pcall = "acpiconf -i batt"
+    local pcall = "acpiconf -i " .. battery
     local f = io.popen(pcall)
     for line in f:lines("*line") do
         for key,value in string.gmatch(line, "(.+):%s+(.+)") do
@@ -32,12 +35,20 @@ local function worker(format)
     -- battery capacity in percent
     local percent = tonumber(string.gsub(bat_info["Remaining capacity"], "[^%d]", ""), 10)
 
-    -- Calculate remaining (charging or discharging) time
+    -- use remaining (charging or discharging) time calculated by acpiconf
     local time = bat_info["Remaining time"]
     if time == "unknown" then
         time = "∞"
     end
 
+    -- calculate wear level from (last full / design) capacity
+    local wear = "N/A"
+    if bat_info["Last full capacity"] and bat_info["Design capacity"] then
+        local l_full =  tonumber(string.gsub(bat_info["Last full capacity"], "[^%d]", ""), 10)
+        local design = tonumber(string.gsub(bat_info["Design capacity"], "[^%d]", ""), 10)
+        wear = math.floor( 100 - (l_full / design * 100))
+    end
+
     -- dis-/charging rate as presented by battery
     local rate = string.gsub( string.gsub(bat_info["Present rate"], ".*mA[^%d]+", ""), "[%s]+mW.*", "")
     rate = string.format( "% 2.1f", tonumber(rate / 1000))
@@ -46,8 +57,9 @@ local function worker(format)
     --  * state (high "↯", discharging "-", charging "+", N/A "⌁" }
     --  * remaining_capacity (percent)
     --  * remaining_time, by battery
+    --  * wear level (percent)
     --  * present_rate (mW)
-    return {state, percent, time, rate}
+    return {state, percent, time, wear, rate}
 end
 
 return setmetatable(bat_acpi, { __call = function(_, ...) return worker(...) end })