On click, showcase the Top 10 Consumers

This requires a sudo change that will be a separate pull request to
LARBS repository. Also requires powertop.

Additionally, it will show the estimated remaining battery life when
discharging.

Screenshots will be attached to the GitHub PR.

.local/bin/statusbar/battery

@@ -1,32 +1,99 @@
 #!/usr/bin/env sh
 # Give a battery name (e.g. BAT0) as an argument.
 
-case $BLOCK_BUTTON in
-    3) pgrep -x dunst >/dev/null && notify-send "🔋 Battery module" "🔋: discharging
+# Arbitrary but unique appid
+# Generated by mashing on my keyboard
+appid=1859028
+# Max width of the dunst notifications. May be system dependent?
+maxwidth=29
+# Help text
+help_text=$(cat <<-EOF
+🔋: discharging
 🛑: not charging
 ♻: stagnant charge
 🔌: charging
 ⚡: charged
 ❗: battery very low!
-- Text color reflects charge left" ;;
+- Text color reflects charge left
+EOF
+);
+
+
+# For testing, take the second arg as button press
+if ! [ -z $2 ]; then
+  BLOCK_BUTTON=$2
+fi
+
+
+case $BLOCK_BUTTON in
+  1)
+    # Get current power stats
+    sudo powertop -q --csv=/tmp/powertop.csv -t=5 >/dev/null 2>&1
+
+    # Cut out the 'Top 10 Power Consumers'
+    start_line=$(grep -n "Top 10 Power Consumers" /tmp/powertop.csv \
+      | cut -d: -f1)
+    start_line=$(expr $start_line + 3)
+    end_line=$(expr $start_line + 9)
+
+    # Parse it out
+    top_consumers=$(sed -n "$start_line,${end_line}p" /tmp/powertop.csv \
+      | grep -v powertop \
+      | cut -d';' -f5,4 \
+      | sed -Ee \
+         "s/Display backlight*/Display/;"`
+        `"s/Radio device: *//;"`
+        `"s/\[PID [0-9]*\] *//;"`
+        `"s,\[([a-z]+)/[0-9:]+\],\1,;"`
+        `"s/: *([A-Za-z0-9]* *[A-Za-z0-9]*) */:\1/;"`
+        `"s/[ \t]*$//;"`
+        `"s,.*/,,;"`
+        `"s/://g;"`
+        `"s/[ \t]*;[ \t]*/;/" \
+      | tr ';' ':' \
+      | column -c $maxwidth -s':' --table -T 1 -R 2)
+
+    # Finally, send!
+    dunstify -u low -t 20000 -r $appid -i none "🔋 Top Consumers" "$top_consumers"
+    ;;
+  3)
+    dunstify -u low -r $appid -i none " Battery module" "$help_text"
+    ;;
 esac
 
-capacity=$(cat /sys/class/power_supply/"$1"/capacity) || exit
-status=$(cat /sys/class/power_supply/"$1"/status)
+capacity=$(cat /sys/class/power_supply/"${1:-BAT0}"/capacity) || exit
+status=$(cat /sys/class/power_supply/"${1:-BAT0}"/status)
+
+# `upower` take an average over time which is nice to have for a status bar
+# `acpi` is another decent method, but takes an instantaneous average
+if [ -x /usr/bin/upower ]; then
+  time_remaining=" $(upower --show-info /org/freedesktop/UPower/devices/battery_${1-BAT0} | grep 'time to empty' | cut -d: -f2 | xargs)"
+elif [ -x /usr/bin/acpi ]; then
+  time_remaining=$(acpi -b | cut -d, -f3 | cut -d: -f1,2)
+fi
 
 if [ "$capacity" -ge 75 ]; then
-	color="#00ff00"
+  color="#ffffff"
 elif [ "$capacity" -ge 50 ]; then
-	color="#ffffff"
+  color="#ffffff"
 elif [ "$capacity" -ge 25 ]; then
-	color="#ffff00"
+  color="#ffff00"
 else
-	color="#ff0000"
-	warn="❗"
+  color="#ff0000"
+  warn="❗"
+fi
+if [[ $status != "Discharging" ]]; then
+  time_remaining=""
 fi
 
 [ -z $warn ] && warn=" "
 
 [ "$status" = "Charging" ] && color="#ffffff"
 
-printf "<span color='%s'>%s%s%s</span>\n" "$color" "$(echo "$status" | sed -e "s/,//;s/Discharging/🔋/;s/Not Charging/🛑/;s/Charging/🔌/;s/Unknown/♻️/;s/Full/⚡/;s/ 0*/ /g;s/ :/ /g")" "$warn" "$(echo "$capacity" | sed -e 's/$/%/')"
+printf "<span color='%s'>%s%s%s%%%s</span>\n" \
+  "$color" \
+  "$(echo "$status" | sed -e "s/,//;s/Discharging/🔋/;s/Not Charging/🛑/;s/Charging/🔌/;s/Unknown/♻️/;s/Full/⚡/;s/ 0*/ /g;s/ :/ /g")" \
+  "$warn" \
+  "$capacity" \
+  "$time_remaining"
+