Sunpinyin Speedup

sunpinyin_speedup.sh

#!/bin/bash
#sunpinyin_speedup.sh
# Sunpinyin Speedup Script (by memory caching using shm, and no data loss)
# You can run this script in background on GNOME logging in.
# Hexcles Ma(http://robotshell.org/), Published in Public Domain

# Capture the exit signal, make sure it is the FIRST uncommented line.
trap "do_exit" SIGHUP SIGINT SIGQUIT SIGTERM

# Backup checking interval(seconds)
CHECK_INTERVAL=900
# Force backup will be done every FORCE_BACKUP_COUNT intervals
FORCE_BACKUP_COUNT=4

SUN_DIR="${HOME}/.sunpinyin"
SHM_USERDICT="/dev/shm/sunpinyin_userdict.${USER}"

p_count=0

# Backup the userdict and restore all changes made by this script on exit.
do_exit() {
  if [ $p_count -gt 0 ]
  then
    echo "[sunpinyin_speedup]exit, backing up"
    cp -pf "${SHM_USERDICT}" "${SUN_DIR}/userdict.real"
  fi
  mv -f "${SUN_DIR}/userdict.real" "${SUN_DIR}/userdict"
  rm -f "${SHM_USERDICT}"
  echo "[sunpinyin_speedup]backup complete, now size: `ls -l ${SUN_DIR}/userdict | awk '{print $5}'`"
  exit 0
}

# Work around for abnormal quit.
if [ -e "${SUN_DIR}/userdict.real" ]
then
  rm -f "${SHM_USERDICT}"
  mv -f "${SUN_DIR}/userdict.real" "${SUN_DIR}/userdict"
fi

# Rename the real userdict, copy it to RAM and make a symblic link back.
# From now on the modification and query on userdict takes place in RAM.
mv -f "${SUN_DIR}/userdict" "${SUN_DIR}/userdict.real"
cp -pf "${SUN_DIR}/userdict.real" "${SHM_USERDICT}"
ln -sf "${SHM_USERDICT}" "${SUN_DIR}/userdict"

# Automatically backup the userdict, make sure not losing the modification.
while :
do
  p_count=$(($p_count+1))
  for (( i=0; i<CHECK_INTERVAL; i++ ))
  do
    sleep 1
  done
  
  if [ $p_count == $FORCE_BACKUP_COUNT ]
  then
    cp -pf "${SHM_USERDICT}" "${SUN_DIR}/userdict.real"
    p_count=0
  fi
  
  p_mtime_shm=$(stat -c %Y "${SHM_USERDICT}")
  p_mtime_real=$(stat -c %Y "${SUN_DIR}/userdict.real")
  
  if [ $p_mtime_shm -gt $p_mtime_real ]
  then
    echo "[sunpinyin_speedup] `date +%T` userdict modified, backup"
    echo "shm: ${p_mtime_shm} real: ${p_mtime_real}"
    cp -pf "${SHM_USERDICT}" "${SUN_DIR}/userdict.real"
    echo "[sunpinyin_speedup] `date +%T` done, now size: `ls -l ${SUN_DIR}/userdict.real | awk '{print $5}'`"
    p_count=0
  fi
done