Monitors CPU usage level

files/system-monitor-graph@rcassani/desklet.js

@@ -3,6 +3,8 @@ const Settings = imports.ui.settings;
 const Mainloop = imports.mainloop;
 const Lang = imports.lang;
 const Clutter = imports.gi.Clutter;
+const Cinnamon = imports.gi.Cinnamon;
+const Gio = imports.gi.Gio;
 
 
 
@@ -36,16 +38,6 @@ MyDesklet.prototype = {
     setupUI: function(){
         // initialize size
 
-        // create the clutter elements
-        // creates container for one child
-//        this.window = new St.Bin();
-        // creates a label to present text
-  //      this.text = new St.Label();
-        // adds label to container
-    //    this.window.add_actor(this.text);
-        // Sets the container as content actor of the desklet
-      //  this.setContent(this.window);
-
         this.canvas = new Clutter.Actor();
         this.canvas.remove_all_children();
         this.text1 = new St.Label();
@@ -58,30 +50,60 @@ MyDesklet.prototype = {
 
         // set decoration settings
 
-        // set initial values
+        // flag to indicate the first loop of the Desklet
+        this.first_run = true;
+        // update loop for Desklet
         this.update();
     },
 
     update: function() {
-        // console log
-        global.log("update SMG");
-        // do the graph
         // type of system variable to graph
         var type = this.type;
-        // add text to label
-        this.text1.set_text("Hello Desktop2 ".concat(type));
-        this.text2.set_text(type);
-        // positions text
+        var value = 0.0;
+        // do the graph
+
+        // text positions
         this.text1.set_position(null, null);
         this.text2.set_position(null, 50);
 
-        // call this.update() in 5 seconds
-        this.timeout = Mainloop.timeout_add_seconds(5, Lang.bind(this, this.update));
+        // current values
+        switch (type) {
+          case "cpu":
+              // CPU usage https://rosettacode.org/wiki/Linux_CPU_utilization
+              var cpu_values = this.get_cpu_times();
+              var cpu_tot = cpu_values[0];
+              var cpu_idl = cpu_values[1];
+
+              if (this.first_run){
+                  this.first_run = false;
+                  this.cpu_tot = cpu_tot;
+                  this.cpu_idl = cpu_idl;
+              }
+              else {
+                  var cpu_use = 100 * (1 - (cpu_idl - this.cpu_idl) / (cpu_tot - this.cpu_tot));
+                  this.cpu_tot = cpu_tot;
+                  this.cpu_idl = cpu_idl;
+                  this.text1.set_text(type);
+                  this.text2.set_text(Math.round(cpu_use).toString());
+                  // update in graph
+              }
+              break;
+
+          case "ram":
+              value = 12;
+              this.text1.set_text(type);
+              this.text2.set_text(value.toString());
+              global.log("update ram");
+              break;
+        }
+
+
+
+        // call this.update() every in refresh_interval seconds
+        this.timeout = Mainloop.timeout_add_seconds(this.refresh_interval, Lang.bind(this, this.update));
     },
 
     on_setting_changed: function() {
-        // update decoration settings
-//        this.refreshDecoration();
         // settings changed; instant refresh
         Mainloop.source_remove(this.timeout);
         this.update();
@@ -89,6 +111,24 @@ MyDesklet.prototype = {
 
     on_desklet_removed: function() {
         Mainloop.source_remove(this.timeout);
-    }
+    },
 
+    get_cpu_times: function(){
+        // launching sequential processes
+        // https://stackoverflow.com/questions/61147229/multiple-arguments-in-gio-subprocess
+        let subprocess = new Gio.Subprocess({
+            argv: ['/bin/sh', '-c', 'cat /proc/stat | grep cpu -w'],
+            flags: Gio.SubprocessFlags.STDOUT_PIPE,
+          });
+        subprocess.init(null);
+        let [, out] = subprocess.communicate_utf8(null, null); // get full output from stdout
+        let cpu_line = out.split(/\r?\n/)[0];   // get only one line
+        let cpu_values = cpu_line.split(/\s+/); // split by space
+        let cpu_idl = parseFloat(cpu_values[4]);
+        let cpu_tot = 0;
+        for (let i = 1; i<10; i++){
+          cpu_tot += parseFloat(cpu_values[i])
+        }
+        return [cpu_tot, cpu_idl];
+    }
 };