modules: add system_monitor module

modules/meson.build

@@ -2,6 +2,9 @@ modules_dir = pkgdatadir / 'modules'
 
 plugins = [
   'example_module',
+  'system_monitor',
 ]
 
-install_subdir(plugins, install_dir: modules_dir)
+foreach plugin : plugins
+  install_subdir(plugin, install_dir: modules_dir)
+endforeach

modules/system_monitor/bin/stats.sh

+#!/bin/bash
+
+get_cpu_usage() {
+    local cpu_line="$1"
+
+    local stat1=$(grep "^${cpu_line} " /proc/stat)
+    sleep 0.1
+    local stat2=$(grep "^${cpu_line} " /proc/stat)
+
+    local idle1=$(echo "$stat1" | awk '{print $5}')
+    local idle2=$(echo "$stat2" | awk '{print $5}')
+    local total1=$(echo "$stat1" | awk '{sum=0; for(i=2;i<=NF;i++) sum+=$i; print sum}')
+    local total2=$(echo "$stat2" | awk '{sum=0; for(i=2;i<=NF;i++) sum+=$i; print sum}')
+
+    local idle_diff=$((idle2 - idle1))
+    local total_diff=$((total2 - total1))
+
+    if [ "$total_diff" -gt 0 ]; then
+        awk "BEGIN {printf \"%.1f\", 100 * (1 - $idle_diff / $total_diff)}"
+    else
+        echo "0.0"
+    fi
+}
+
+case "$1" in
+    cpu)
+        get_cpu_usage "cpu"
+        ;;
+    cpu[0-9]*)
+        get_cpu_usage "$1"
+        ;;
+    ram)
+        free | awk '/Mem:/ {printf "%.1f", $3/$2*100}'
+        ;;
+    swap)
+        free | awk '/Swap:/ {if($2>0) printf "%.1f", $3/$2*100; else print "0"}'
+        ;;
+esac

modules/system_monitor/system_monitor.yml

+- name: "System Monitor"
+  weight: 50
+  pages:
+    - name: "Monitor"
+      icon: utilities-system-monitor-symbolic
+  sections:
+    - name: "CPU"
+      weight: 0
+      page: "Monitor"
+      type: custom
+      settings:
+        - name: CPU Total
+          type: info_graph
+          update_interval: 1
+          get_command: "{module_path}/bin/stats.sh cpu"
+          map:
+            min: 0
+            max: 100
+            points: 60
+            color: "#e5a50a"
+            suffix: "%"
+
+    - name: "CPU Cores"
+      weight: 5
+      page: "Monitor"
+      type: dynamic
+      generator_command: "seq 0 $(($(nproc)-1))"
+      setting_template:
+        name: "Core {_item}"
+        type: info_graph
+        update_interval: 1
+        get_command: "{module_path}/bin/stats.sh cpu{_item}"
+        map:
+          min: 0
+          max: 100
+          points: 60
+          color: "#ff7800"
+          suffix: "%"
+
+    - name: "Memory"
+      weight: 10
+      page: "Monitor"
+      type: custom
+      settings:
+        - name: RAM Usage
+          type: info_graph
+          update_interval: 1
+          get_command: "{module_path}/bin/stats.sh ram"
+          map:
+            min: 0
+            max: 100
+            points: 60
+            color: "#3584e4"
+            suffix: "%"
+
+        - name: Swap Usage
+          type: info_graph
+          update_interval: 2
+          get_command: "{module_path}/bin/stats.sh swap"
+          map:
+            min: 0
+            max: 100
+            points: 30
+            color: "#c061cb"
+            suffix: "%"