config: barpyrus: config.py: add battery percentage/status to conky

Depending on the state of the battery (discharging/charging) the color
and the battery icon will change.

config/barpyrus/config.py

@@ -69,6 +69,37 @@ conky_text += '${acpitemp}°C '
 conky_text += conky_icon('\ue026', 'green') + '${cpu}% '
 conky_text += conky_icon('\ue021', 'green') + '${memperc}% '
 
+# battery display
+bat_icons = [
+        '\ue242', '\ue243', '\ue244', '\ue245', '\ue246',
+        '\ue247', '\ue248', '\ue249', '\ue24a', '\ue24b',
+]
+bat_delta = 100 / len(bat_icons)
+
+conky_text += '${if_existing /sys/class/power_supply/BAT0}'
+conky_text +=   '${if_match \"$battery\" == \"discharging $battery_percent%\"}'
+for i, icon in enumerate(bat_icons[:-1]):
+    percentage = (i + 1) * bat_delta
+    conky_text += '${if_match $battery_percent < %d}' % (percentage)
+    if percentage <= 20:
+        conky_text += conky_icon(icon, 'red')
+    elif percentage <= 65:
+        conky_text += conky_icon(icon, 'yellow')
+    else:
+        conky_text += conky_icon(icon, 'green')
+    conky_text += '${else}'
+# 100 percent icon
+conky_text +=       conky_icon(bat_icons[-1], 'green')
+# close all previously opened if_match tags
+for _ in bat_icons[:-1]:
+    conky_text += '${endif}'
+conky_text +=   '${else}'
+conky_text +=       conky_icon('\ue239', 'cyan')
+conky_text +=   '${endif}'
+conky_text +=   ' $battery_percent% '
+conky_text += '${endif}'
+conky_text += '%{F-}'
+
 # options for hlwm.HLWMLayoutSwitcher widget
 xkblayouts = [
         'us us -variant altgr-intl us'.split(' '),