Battery warning and poweroff

i3-switcher.py

@@ -7,11 +7,15 @@ import datetime
 import time
 import select
 import os.path as path
+import os
 import glob
 from operator import itemgetter
 import ipc
 import alsaaudio
+import subprocess
 
+battery_warn = 5
+battery_poweroff = 3
 
 def jout(d):
     sys.stdout.write(",")
@@ -46,6 +50,8 @@ def main(argv=None):
     sys.stderr = open(path.join(path.expanduser("~"), "i3-switcher.stderr"), "a")
     debug("Started")
     color = 0x00FF00
+    last_batt_perc = 100
+    DEVNULL = os.open(os.devnull, os.O_RDWR)
     while True:
         # Windows
         clients = ipc.getwin(i3command.command(ipc.TREE))
@@ -97,6 +103,7 @@ def main(argv=None):
             except IOError:
                 pass
 
+        batt_percs = []
         for batt_sys_path in glob.glob("/sys/bus/acpi/drivers/battery/*/power_supply/*"):
             try:
                 try:
@@ -116,6 +123,7 @@ def main(argv=None):
                 else:
                     batt_char = u" "
                 batt_perc = 100*batt_now//batt_max
+                batt_percs.append(batt_perc)
                 batt_col = 255*batt_now//batt_max
                 battstr = u"%s%3s" % (batt_char, str(batt_perc)+"%" if batt_status!="Full" else "Full")
                 out.append({
@@ -126,6 +134,13 @@ def main(argv=None):
             except IOError:
                 pass
 
+        batt_perc_overall = max(batt_percs)
+        if batt_perc_overall<=battery_warn and int(batt_perc_overall)<int(last_batt_perc):
+            last_batt_perc = batt_perc_overall
+            subprocess.call(["i3-nagbar", "-m", "Battery low (%s)" % ", ".join("%s%%" % p for p in batt_percs)], stdin=DEVNULL, stdout=DEVNULL)
+        if batt_perc_overall<=battery_poweroff:
+            subprocess.call(["/usr/sbin/poweroff"], stdin=DEVNULL, stdout=DEVNULL)
+
         # Date/time
         out.append({"name": "datetime", "full_text": datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"), "color": "%06x" % color})