From 00533c13f6cd0ee6ff6406df2f5a425ec7145e4d Mon Sep 17 00:00:00 2001
From: Alice Gaudon <alice@gaudon.pro>
Date: Sun, 18 Jul 2021 15:34:55 +0200
Subject: [PATCH] Add support for coarse representation of battery capacity,
 refactor battery widget for multiple battery display

https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-class-power
---
 simple/widgets/system_resources.lua | 103 ++++++++++++++++------------
 1 file changed, 60 insertions(+), 43 deletions(-)

diff --git a/simple/widgets/system_resources.lua b/simple/widgets/system_resources.lua
index 03c2eeb..08b0a3d 100644
--- a/simple/widgets/system_resources.lua
+++ b/simple/widgets/system_resources.lua
@@ -1,3 +1,4 @@
+local awful = require("awful")
 local beautiful = require("beautiful")
 local gears = require("gears")
 local naughty = require("naughty")
@@ -131,20 +132,9 @@ gears.timer {
 
 
 
-
-local battery = wibox.widget {
-    {
-        markup = "-- %",
-        align = "center",
-        valign = "center",
-        widget = wibox.widget.textbox,
-    },
-    margins = beautiful.system_resources_widget_battery_margin,
-    widget = wibox.container.margin,
-}
-
-local batteryText = battery:get_children()[1]
-
+---
+--- Batteries
+---
 local rawBatteries = readCommand("ls -A1 /sys/class/power_supply")
 
 function getBatteries()
@@ -155,48 +145,75 @@ function hasBattery()
     return rawBatteries:len() > 0
 end
 
-function getBatteryCapacity()
+function getBatteryLevel(battery)
     local charge = 0
     local capacity = 0
-    for b in getBatteries() do
-        if b:sub(1,3) ~= 'hid' and readCommand("cat /sys/class/power_supply/" .. b .. "/type"):match("Battery") then
-            if fileExists("/sys/class/power_supply/" .. b .. "/energy_now") then
-                charge = charge + readCommand("cat /sys/class/power_supply/" .. b .. "/energy_now")
-                capacity = capacity + readCommand("cat /sys/class/power_supply/" .. b .. "/energy_full")
-            else
-                charge = charge + readCommand("cat /sys/class/power_supply/" .. b .. "/charge_now")
-                capacity = capacity + readCommand("cat /sys/class/power_supply/" .. b .. "/charge_full")
-            end
-        end
+    if fileExists(battery .. "/energy_now") then
+        charge = charge + readCommand("cat " .. battery .. "/energy_now")
+        capacity = capacity + readCommand("cat " .. battery .. "/energy_full")
+    elseif fileExists(battery .. "/charge_now") then
+        charge = charge + readCommand("cat " .. battery .. "/charge_now")
+        capacity = capacity + readCommand("cat " .. battery .. "/charge_full")
+    elseif fileExists(battery .. "/capacity_level") then
+        return readCommand("cat " .. battery .. "/capacity_level")
+    else
+        return "Unsupported"
     end
-    return charge / capacity
+    return string.format("%." .. config.battery.precision .. "f", (charge / capacity) * 100) .. "%"
 end
 
-function isCharging()
-    for b in getBatteries() do
-        if readCommand("cat /sys/class/power_supply/" .. b .. "/type"):match("Battery") then
-            return readCommand("cat /sys/class/power_supply/" .. b .. "/status") ~= "Discharging"
-        end
-    end
-    return nil
+function isCharging(battery)
+    return not readCommand("cat " .. battery .. "/status") == "Discharging"
 end
 
+
+local batteryContainer = wibox.widget {
+    layout = wibox.layout.flex.horizontal
+}
 if hasBattery() then
-    gears.timer {
-        timeout = config.battery.refresh_interval,
-        call_now = true,
-        autostart = true,
-        callback = function()
-            batteryText.markup = string.format("%." .. config.battery.precision .. "f", getBatteryCapacity() * 100) .. "%"
+    for battery in getBatteries() do
+        local path = "/sys/class/power_supply/" .. battery
+        if readCommand("cat " .. path .. "/type"):match("Battery") then
+            -- widget
+            local widget = wibox.widget {
+                {
+                    markup = "-- %",
+                    align = "center",
+                    valign = "center",
+                    widget = wibox.widget.textbox,
+                },
+                margins = beautiful.system_resources_widget_battery_margin,
+                widget = wibox.container.margin,
+            }
+
+            -- tooltip
+            local name = readCommand("cat " .. path .. "/model_name")
+            local tooltip = awful.tooltip {
+                text = name
+            }
+            tooltip:add_to_object(widget)
+
+            -- update battery level
+            local batteryText = widget:get_children()[1]
+            gears.timer {
+                timeout = config.battery.refresh_interval,
+                call_now = true,
+                autostart = true,
+                callback = function()
+                    batteryText.markup = (isCharging(path) and "+" or "") .. getBatteryLevel(path)
+                end
+            }
+
+            batteryContainer:add(widget)
         end
-    }
+    end
 else
-    battery = nil
+    batteryContainer = nil
 end
 
 
 
 return {
     bars = bars,
-    battery = battery,
-}
\ No newline at end of file
+    battery = batteryContainer,
+}