#!/bin/sh
t=0
f=0
rev=0
to='null'
from='null'
file='null'

function usage()
{
echo "Usage: transformfile  -t codeset -f codeset filename
             transformfile -r -t codeset -f codeset *.ext
     Option:
        -t  to codeset
        -f  from codeset
        -r  recursion sub dir
"
}

for v in $@
do
if [ $v == '-t' ];then
  t=1
  continue
elif [ $t -eq 1 ];then
  to="$v"
  t=0
  continue
elif [ $v == '-f' ];then
  f=1
  continue
elif [ $f  -eq 1 ];then
  from=$v
  f=0
  continue
elif [ $v == '-r' ];then
  rev=1
continue
fi
file=$v
done

if [ $to == 'null' ];then
echo 'no to codeset'
usage 
exit
fi
if [ $from == 'null' ];then
echo 'no from codeset'
usage 
exit
fi
if [ $file == 'null' ];then
echo 'no transfrom file'
usage 
exit
fi
dir=`dirname "$file"`
fn=`basename "$file"`
if [ $rev -eq 1 ];then
    for i in `find "$dir" -name "$fn"`
    do
echo "transfrom $i"
tmpfile="${i}.tmp"
iconv -c -f $from -t $to "$i" > "$tmpfile"
if [ $? -eq 0 ];then
    mv "$tmpfile" "${i}"
    echo "Success"
else 
    rm -f "$tmpfile"
    echo "Failure"
fi
done
else
for i in `realpath "$file"`
do
tmpfile="${i}.tmp"
iconv -c -f $from -t $to "$i" > "$tmpfile"
if [ $? -eq 0 ];then
    mv "$tmpfile" "${i}"
    echo "Success"
else 
    rm -f "$tmpfile"
    echo "Failure"
fi
done
fi