suranap

-- Check the battery level
set batteryLevel to do shell script "pmset -g batt | grep -Eo \"\\d+%\" | cut -d \"%\" -f 1"
set onBattery to do shell script "pmset -g batt | grep -q \"Battery Power\" && echo 1 || echo 0"
set onLowPowerMode to do shell script "pmset -g | grep lowpowermode | grep -o \"[0-9]*\" "

if onLowPowerMode = "0" and batteryLevel < 20 then
	do shell script "pmset -a lowpowermode 1" with administrator privileges
else if onLowPowerMode = "1" and (batteryLevel > 80 or onBattery = "0") then
	do shell script "pmset -a lowpowermode 0" with administrator privileges
end if

suranap

# Tree transformation combinators

# portable strategies

def seqS(*strategies):
    def seqaux(tree):
        tmp = tree 
        for s in strategies:
            tmp = s(tmp)