Add battery support for Linux system-info script

system-info/system-info-Linux.sh

@@ -22,17 +22,36 @@ else
   }
 fi
 
+if [ "`acpi -b`" != "No support for device type: power_supply" ]; then
+  function get_battery {
+    acpi -b | \
+    awk '{ print $4 }' | \
+    awk '$battery ~ /.*/ {
+      printf "%3d%% %s\n", $battery, substr("󰂎󰁺󰁻󰁼󰁽󰁾󰁿󰂀󰂁󰂂󰁹", int($battery / 9), 1)
+    }'
+  }
+else
+  function get_battery {
+    echo ''
+  }
+fi
+
 # Cleanup cache file when interrupted.
 trap '[ -f $cache_file ] && rm $cache_file; exit' INT
 trap '[ -f $cache_file ] && rm $cache_file; exit' TERM
 
 while true; do
   # Parse the current CPU load on all cores/threads.
-  cpu_load=`mpstat -P ALL -n 1 -u 1 -o JSON | \
+  cpu_load=" `mpstat -P ALL -n 1 -u 1 -o JSON | \
     jq '.sysstat.hosts[0].statistics[0]["cpu-load"][1:]|.[].idle' | \
-    awk '$idle ~ /[-.0-9]*/ { printf "%s", substr("█▇▆▅▄▃▂▁ ", int($idle / 11), 1) }'`
+    awk '$idle ~ /[-.0-9]*/ { printf "%s", substr("█▇▆▅▄▃▂▁ ", int($idle / 11), 1) }'`"
+
   # Parse the current CPU package temperature.
   cpu_temp=$(get_cpu_temp)
+
+  # Get the battery status if present.
+  battery=$(get_battery)
+
   # Write to the cache file.
-  echo "$cpu_temp $cpu_load" > $cache_file
+  echo "$cpu_temp$cpu_load$battery" > $cache_file
 done