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#!/bin/bash

: << mark
转码工具，支持UTF-8转GBK和GBK转UTF-8
孔令飞@2012-05-07
mark

#set -x

scode="gbk"
dcode="utf-8"

function Usage()
{
	cat << EOF
Usage: conv [OPTIONS] [DIR]
[-u]	GBK to UTF-8
[-g]	UTF-8 to GBK
EOF
	exit 1
}


#将当前目录下所有普通文件进行转码 GBK to UTF-8
function g2u()
{
	local dir=$1
	printf "Convering $dir ......"
	for file in $(ls $dir)
	do
		file="$dir/$file"
		if [ -f $file ];then

			coding=$(file -b $file | cut -d ' ' -f1)

			#进行转码
			if [ "$coding" = "ISO-8859" ];then
				local tmpfile=$(mktemp)
				Fright=$(stat -c %a $file)
				Fuser=$(stat -c %U $file)
				Fgro=$(stat -c %G $file)
				iconv -f $scode -t $dcode $file > $tmpfile || Usage
				mv $tmpfile $file &&
				chmod $Fright $file
				chown $Fuser:$Fgrp $file
			fi
		fi
	done
	printf "      done\n"
}

function u2g()
{
	local dir=$1
	printf "Convering $dir ......"
	for file in $(ls $dir)
	do
		file="$dir/$file"
		if [ -f $file ];then

			coding=$(file -b $file |cut -d ' ' -f1)

			#进行转码
			if [ "$coding" = "UTF-8" ];then
				local tmpfile=$(mktemp)
				Fright=$(stat -c %a $file)
				Fuser=$(stat -c %U $file)
				Fgro=$(stat -c %G $file)
				iconv -f $dcode -t $scode $file > $tmpfile || Usage
				mv $tmpfile $file &&
				chmod $Fright $file
				chown $Fuser:$Fgrp $file
			fi
		fi
	done
	printf "      done\n"
}

[ $# -ne 2 ] && Usage

while getopts ug opt
do
	case $opt in
		u) echo "Convert gbk coding to utf-8 ...."
		for dir in $(find $2 -type d)
		do
			g2u $dir
		done
		;;
		g) echo "Convert utf-8 coding to gbk ...."
		for dir in $(find $2 -type d)
		do
			u2g $dir
		done
		;;
		*) Usage
		exit 1
		;;
	esac
done

exit 0