scheduler_script

#!/system/bin/sh

SCHED_PATH=/sys/block/mmcblk1/queue/scheduler
SETTINGS_PATH=/data/data/com.android.settings/app_tiamat_controls/scheduler
DEFAULT_MISSING=bfq
NUM_ENTRIES="-1"
SCHED_NAMES="-1"
EXIT="-1"

if [ ! -e $SETTINGS_PATH ]; then
  echo $DEFAULT_MISSING > $SETTINGS_PATH
fi

USER_DEF=$(cat $SETTINGS_PATH)
echo $USER_DEF > $SCHED_PATH

writeEntry()
{
val="$1"
echo "Writing $val scheduler to system..."
echo $val > $SCHED_PATH
echo $val > $SETTINGS_PATH
sleep 1
}

menu()
{
clear
unset SCHED_NAMES
a=0

items=$(cat $SCHED_PATH | awk '{print $0}')
echo " "
echo "**************************************"
echo "*                                    *"
echo "* Currently available io schedulers: *"
echo "*                                    *"
echo "**************************************"
echo " "
for i in $items; do
  SCHED_NAMES=( ${SCHED_NAMES[@]-} $(echo "$i") )
  echo $(( $a + 1 ))") "${SCHED_NAMES[$a]}
  echo " "
  len=${#i}
  len1=$(($len-2))
  tmp=${i: -$len:1}
  echo $len $len1 $tmp
  if [ "$tmp" == "[" ]; then
    DEFAULT_CURRENT=${i:1:$len1}
  fi
  (( a++ ))
done
NUM_ENTRIES=${#SCHED_NAMES[@]}
echo "The current default io scheduler is set to \"$DEFAULT_CURRENT\""
echo "Enter 1-$NUM_ENTRIES to select an io scheduler or \"x\" to exit"
echo "Make selection now: "
}

getInput()
{
read CHOICE

#filter for valid entry
i=1
valid_entry="-1"
exit="-1"

#check for exit
if [ "$CHOICE" == "x" -o "$CHOICE" == "X" ]; then
  EXIT="true"
  clear
  echo "Exiting script..."
  sleep 1
  clear
  return 0
fi

while [ $i -le $CHOICE ]; do
  if [ "$i" == "$CHOICE" ]; then
    valid_entry="true"
    writeEntry ${SCHED_NAMES[(($i-1))]}
    echo "Done!"
    sleep 1
    break
  fi
  (( i++ ))
done

if [ "$valid_entry" == "true" ]; then
  return 0
else
   echo " \"$CHOICE\" is not a valid entry"
   sleep 1
   return 1
fi
}

while [ true ]; do
  menu
  getInput
  if [ "$EXIT" == "true" ]; then break; fi
done
exit 0