Add battery percentage widget

README.md

@@ -9,6 +9,7 @@ By default, Simple Awesome uses
 
 - `rofi` - launch bar / window switcher
 - `flameshot` - screenshot utility
+- `alsa-utils` - amixer command provider (media keys volume control)
 
 ## Optional dependencies
 
@@ -18,7 +19,7 @@ By default, Simple Awesome uses
 
 ## To do
 
-- Add a sound level control widget
+- Add a sound volume control widget
 - Add a media control widget
 - Manage workspaces
 - Improve "leave menu"'s design

default_config.lua

@@ -131,7 +131,17 @@ config.widgets = {
 
     -- Enable/disable the system resources monitoring widget
     system_resources = {
-        enabled = true,
+        bars = {
+            enabled = true,
+            screens = { 1, 2 },
+            refresh_interval = 1.5, -- In seconds
+        },
+        battery = {
+            enabled = true,
+            screens = { 1, 2 },
+            refresh_interval = 30, -- In seconds
+            precision = 0, -- How many decimals
+        },
     },
 }
 
@@ -164,10 +174,6 @@ config.windowSwitcher = "rofi -show window -config " .. awful.util.getdir("confi
 -- Media control
 config.volume_osd_timeout = 2
 
--- System resources widget
-config.system_resources_widget_screens = { 1, 2 }
-config.system_resources_widget_refresh_interval = 1.5 -- In seconds
-
 
 -- Awesome tweaks
 naughty.config.defaults.timeout = 15

default_theme.lua

@@ -68,6 +68,7 @@ theme.system_resources_widget_bar_margin = dpi(2)
 theme.system_resources_widget_bar_shape = function(cr, width, height)
     return gears.shape.rounded_rect (cr, width, height, 2)
 end
+theme.system_resources_widget_battery_margin = theme.system_resources_widget_bar_width
 
 -- There are other variable sets
 -- overriding the default one when

simple/init.lua

@@ -110,10 +110,7 @@ hotkey.registerKeys(media_control.getKeys(config.keys.global_keys.media_control)
 --
 
 -- System resources
-local system_resources_widget
-if config.widgets.system_resources.enabled then
-    system_resources_widget = require("simple/widgets/system_resources")
-end
+local system_resources_widget = require("simple/widgets/system_resources")
 
 -- Keyboard map indicator and switcher
 local keyboard_layout = require("simple/widgets/keyboard_layout")
@@ -322,7 +319,8 @@ awful.screen.connect_for_each_screen(function(s)
         {
             -- Right widgets
             layout = wibox.layout.fixed.horizontal,
-            matchesScreen(config.system_resources_widget_screens) and system_resources_widget.widget or nil,
+            matchesScreen(config.widgets.system_resources.bars.screens) and system_resources_widget.bars or nil,
+            matchesScreen(config.widgets.system_resources.battery.screens) and system_resources_widget.battery or nil,
             keyboard_layout_widget,
             wibox.widget.systray(),
             mytextclock,

simple/widgets/system_resources.lua

@@ -3,7 +3,7 @@ local gears = require("gears")
 local naughty = require("naughty")
 local wibox = require("wibox")
 
-local config = require("config")
+local config = require("config").widgets.system_resources
 
 local inspect = require("simple/debug/inspect")
 
@@ -27,14 +27,13 @@ local bar = {
     widget = wibox.container.margin,
 }
 
-local widget = wibox.widget {
+local bars = wibox.widget {
     bar,
     bar,
     bar,
     layout = wibox.layout.flex.horizontal
 }
 
-
 function readCommand(command)
     local handle = io.popen(command, "r")
     local r = handle:read("*a")
@@ -43,7 +42,7 @@ function readCommand(command)
 end
 
 
-local cpuBar = widget:get_children()[1]:get_children()[1]:get_children()[1]
+local cpuBar = bars:get_children()[1]:get_children()[1]:get_children()[1]
 function getCpuData()
     local raw = readCommand("cat /proc/stat | head -n 1")
     local data = {raw:match((raw:gsub("[^ ]* ", "([^ ]*) ")))}
@@ -63,7 +62,7 @@ local lastCpuTime = -1
 local lastCpuIdle = -1
 
 gears.timer {
-    timeout = config.system_resources_widget_refresh_interval,
+    timeout = config.bars.refresh_interval,
     call_now = true,
     autostart = true,
     callback = function()
@@ -83,7 +82,7 @@ gears.timer {
 }
 
 
-local memoryBar = widget:get_children()[2]:get_children()[1]:get_children()[1]
+local memoryBar = bars:get_children()[2]:get_children()[1]:get_children()[1]
 function getTotalMemory()
     return readCommand("cat /proc/meminfo | grep MemTotal | awk '{print $2}'")
 end
@@ -95,7 +94,7 @@ function getFreeMemory()
 end
 
 gears.timer {
-    timeout = config.system_resources_widget_refresh_interval,
+    timeout = config.bars.refresh_interval,
     call_now = true,
     autostart = true,
     callback = function()
@@ -104,7 +103,7 @@ gears.timer {
 }
 
 
-local swapBar = widget:get_children()[3]:get_children()[1]:get_children()[1]
+local swapBar = bars:get_children()[3]:get_children()[1]:get_children()[1]
 function getTotalSwap()
     return readCommand("cat /proc/meminfo | grep SwapTotal | awk '{print $2}'")
 end
@@ -113,7 +112,7 @@ function getFreeSwap()
 end
 
 gears.timer {
-    timeout = config.system_resources_widget_refresh_interval,
+    timeout = config.bars.refresh_interval,
     call_now = true,
     autostart = true,
     callback = function()
@@ -123,6 +122,67 @@ 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]
+
+local rawBatteries = readCommand("ls -A1 /sys/class/power_supply")
+
+function getBatteries()
+    return rawBatteries:gmatch("([^\n]+)")
+end
+
+function hasBattery()
+    return rawBatteries:len() > 0
+end
+
+function getBatteryCapacity()
+    local charge = 0
+    local capacity = 0
+    for b in getBatteries() do
+        if readCommand("cat /sys/class/power_supply/" .. b .. "/type"):match("Battery") then
+            charge = charge + readCommand("cat /sys/class/power_supply/" .. b .. "/energy_now")
+            capacity = capacity + readCommand("cat /sys/class/power_supply/" .. b .. "/energy_full")
+        end
+    end
+    return charge / capacity
+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
+end
+
+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) .. "%"
+        end
+    }
+else
+    battery = nil
+end
+
+
+
 return {
-    widget = widget
+    bars = bars,
+    battery = battery,
 }