Add system resources monitor widget on screen n°

default_config.lua

@@ -32,6 +32,9 @@ config.windowSwitcher = "rofi -show window -config " .. awful.util.getdir("confi
 -- Media control
 config.volume_osd_timeout = 2
 
+-- System resources widget
+config.system_resources_widget_refresh_interval = 1.5 -- In seconds
+
 
 -- Awesome tweaks
 naughty.config.defaults.timeout = 15

default_theme.lua

@@ -77,6 +77,16 @@ theme.volume_osd_icon_1 = simple_awesome_path .. "/icons/volume.svg"
 theme.volume_osd_icon_2 = simple_awesome_path .. "/icons/volume-1.svg"
 theme.volume_osd_icon_3 = simple_awesome_path .. "/icons/volume-2.svg"
 
+-- System resources widget
+theme.system_resources_widget_bar_bg = theme.bg_focus
+theme.system_resources_widget_bar_color = "#ffffff"
+theme.system_resources_widget_border_color = theme.fg_normal
+theme.system_resources_widget_border_width = 1
+theme.system_resources_widget_bar_width = dpi(8)
+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
 
 -- There are other variable sets
 -- overriding the default one when

rc.lua

@@ -59,6 +59,9 @@ beautiful.init(config.theme)
 -- Media control
 local media_control = require("media_control")
 
+-- System Resources widget
+local system_resources_widget = require("widgets/system_resources/system_resources")
+
 -- Tiling
 local tiling = require("tiling")
 
@@ -74,6 +77,7 @@ if config.screenshot_utility_auto_start then
     awful.spawn(config.screenshot_utility_auto_start_command)
 end
 
+
 -- This is used later as the default terminal and editor to run.
 editor = os.getenv("EDITOR") or "nano"
 editor_cmd = config.terminal .. " -e " .. editor
@@ -307,6 +311,7 @@ awful.screen.connect_for_each_screen(function(s)
         },
         s.mytasklist, -- Middle widget
         { -- Right widgets
+            s.index == 2 and system_resources_widget.widget or nil,
             layout = wibox.layout.fixed.horizontal,
             mykeyboardlayout,
             wibox.widget.systray(),

widgets/system_resources/system_resources.lua

@@ -0,0 +1,128 @@
+local beautiful = require("beautiful")
+local gears = require("gears")
+local naughty = require("naughty")
+local wibox = require("wibox")
+
+local config = require("../../config")
+
+local inspect = require("../../debug/inspect")
+
+local bar = {
+    {
+        {
+            max_value = 1,
+            value = 0,
+            widget = wibox.widget.progressbar,
+            color = beautiful.system_resources_widget_bar_color,
+            background_color = beautiful.system_resources_widget_bar_bg,
+            shape = beautiful.system_resources_widget_bar_shape,
+            border_color = beautiful.system_resources_widget_border_color,
+            border_width = beautiful.system_resources_widget_border_width,
+        },
+        forced_width = beautiful.system_resources_widget_bar_width,
+        direction = "east",
+        layout = wibox.container.rotate,
+    },
+    margins = beautiful.system_resources_widget_bar_margin,
+    widget = wibox.container.margin,
+}
+
+local widget = wibox.widget {
+    bar,
+    bar,
+    bar,
+    layout = wibox.layout.flex.horizontal
+}
+
+
+function readCommand(command)
+    local handle = io.popen(command, "r")
+    local r = handle:read("*a")
+    handle:close()
+    return r
+end
+
+
+local cpuBar = widget: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("[^ ]* ", "([^ ]*) ")))}
+    return {
+        user = data[3],
+        nice = data[4],
+        system = data[5],
+        idle = data[6],
+        iowait = data[7],
+        irq = data[8],
+        softirq = data[9],
+        steal = data[10],
+    }
+end
+
+local lastCpuTime = -1
+local lastCpuIdle = -1
+
+gears.timer {
+    timeout = config.system_resources_widget_refresh_interval,
+    call_now = true,
+    autostart = true,
+    callback = function()
+
+        local data = getCpuData()
+
+        local currentCpuTime = data.user + data.nice + data.system + data.idle + data.iowait + data.irq + data.softirq + data.steal
+        local currentCpuIdle = data.idle + data.iowait
+
+        if(lastCpuTime >= 0) then
+            cpuBar.value = 1 - (currentCpuIdle - lastCpuIdle) / (currentCpuTime - lastCpuTime)
+        end
+
+        lastCpuTime = currentCpuTime
+        lastCpuIdle = currentCpuIdle
+    end
+}
+
+
+local memoryBar = widget:get_children()[2]:get_children()[1]:get_children()[1]
+function getTotalMemory()
+    return readCommand("cat /proc/meminfo | grep MemTotal | awk '{print $2}'")
+end
+function getAvailableMemory()
+    return readCommand("cat /proc/meminfo | grep MemAvailable | awk '{print $2}'")
+end
+function getFreeMemory()
+    return readCommand("cat /proc/meminfo | grep MemFree | awk '{print $2}'")
+end
+
+gears.timer {
+    timeout = config.system_resources_widget_refresh_interval,
+    call_now = true,
+    autostart = true,
+    callback = function()
+        memoryBar.value = 1 - getAvailableMemory() / getTotalMemory()
+    end
+}
+
+
+local swapBar = widget:get_children()[3]:get_children()[1]:get_children()[1]
+function getTotalSwap()
+    return readCommand("cat /proc/meminfo | grep SwapTotal | awk '{print $2}'")
+end
+function getFreeSwap()
+    return readCommand("cat /proc/meminfo | grep SwapFree | awk '{print $2}'")
+end
+
+gears.timer {
+    timeout = config.system_resources_widget_refresh_interval,
+    call_now = true,
+    autostart = true,
+    callback = function()
+        swapBar.value = 1 - getFreeSwap() / getTotalSwap()
+    end
+}
+
+
+
+return {
+    widget = widget
+}