battery widgets support multiple batteries

Added support for the battery widgets to read multiple battery values
from the acpi output. The total charge becomes average of all of the
available batteries, the status is that of the highest battery.

battery-widget/battery.lua

@@ -67,14 +67,34 @@ local function show_battery_warning()
     }
 end
 
+local last_battery_check = os.time()
+
 watch("acpi", 10,
     function(widget, stdout, stderr, exitreason, exitcode)
         local batteryType
-        local _, status, charge_str, time = string.match(stdout, '(.+): (%a+), (%d?%d?%d)%%,? ?.*')
-        local charge = tonumber(charge_str)
+
+        local battery_info = {}
+        for s in stdout:gmatch("[^\r\n]+") do
+            local _, status, charge_str, time = string.match(s, '(.+): (%a+), (%d?%d?%d)%%,? ?.*')
+            table.insert(battery_info, {status = status, charge = tonumber(charge_str)})
+        end
+
+        local charge = 0
+        local status
+        for i, batt in ipairs(battery_info) do
+            if batt.charge >= charge then
+                status = batt.status -- use most charged battery status
+                -- this is arbitrary, and maybe another metric should be used
+            end
+
+            charge = charge + batt.charge
+        end
+        charge = charge // #battery_info -- use average charge for battery icon
+
         if (charge >= 0 and charge < 15) then
             batteryType = "battery-empty%s-symbolic"
-            if status ~= 'Charging' then
+            if status ~= 'Charging' and os.difftime(os.time(), last_battery_check) > 300 then
+                -- if 5 minutes have elapsed since the last warning
                 show_battery_warning()
             end
         elseif (charge >= 15 and charge < 40) then batteryType = "battery-caution%s-symbolic"
@@ -82,11 +102,13 @@ watch("acpi", 10,
         elseif (charge >= 60 and charge < 80) then batteryType = "battery-good%s-symbolic"
         elseif (charge >= 80 and charge <= 100) then batteryType = "battery-full%s-symbolic"
         end
+
         if status == 'Charging' then
             batteryType = string.format(batteryType, '-charging')
         else
             batteryType = string.format(batteryType, '')
         end
+
         widget.icon:set_image(PATH_TO_ICONS .. batteryType .. ".svg")
 
         -- Update popup text

batteryarc-widget/batteryarc.lua

@@ -38,11 +38,30 @@ local batteryarc = wibox.widget {
 -- mirror the widget, so that chart value increases clockwise
 local batteryarc_widget = wibox.container.mirror(batteryarc, { horizontal = true })
 
+local last_battery_check = os.time()
+
 watch("acpi", 10,
     function(widget, stdout, stderr, exitreason, exitcode)
         local batteryType
-        local _, status, charge_str, time = string.match(stdout, '(.+): (%a+), (%d?%d%d)%%,? ?.*')
-        local charge = tonumber(charge_str)
+
+        local battery_info = {}
+        for s in stdout:gmatch("[^\r\n]+") do
+            local _, status, charge_str, time = string.match(s, '(.+): (%a+), (%d?%d?%d)%%,? ?.*')
+            table.insert(battery_info, {status = status, charge = tonumber(charge_str)})
+        end
+
+        local charge = 0
+        local status
+        for i, batt in ipairs(battery_info) do
+            if batt.charge >= charge then
+                status = batt.status -- use most charged battery status
+                -- this is arbitrary, and maybe another metric should be used
+            end
+
+            charge = charge + batt.charge
+        end
+        charge = charge // #battery_info -- use average charge for battery icon
+
         widget.value = charge / 100
         if status == 'Charging' then
             mirrored_text_with_background.bg = beautiful.widget_green
@@ -54,7 +73,8 @@ watch("acpi", 10,
 
         if charge < 15 then
             batteryarc.colors = { beautiful.widget_red }
-            if status ~= 'Charging' then
+            if status ~= 'Charging' and os.difftime(os.time(), last_battery_check) > 300 then
+                -- if 5 minutes have elapsed since the last warning
                 show_battery_warning()
             end
         elseif charge > 15 and charge < 40 then