#!/bin/bash

# batch replace string in files
# copyright by calvin in 2013

if [ $# -ne 3 ] ; then
	echo "USAGE : bstr \"FILES\" SRCSTR DSTSTR"
	exit 9
fi

FILES=$1
SRCSTR=$2
DSTSTR=$3

OLDIFS=$IFS
IFS=$'\n'

CNT=0
for FILENAME in `ls -d $FILES` ; do
	FLG=0
	while read LINE ; do
		echo "$LINE" | grep "\/\*" > /dev/null
		if [ $? -eq 0 ] ; then
			continue
		fi
		
		NEWLINE=`echo $LINE | sed "s/$SRCSTR/$DSTSTR/g"`
		if [ x"$NEWLINE" = x"$LINE" ] ; then
			continue
		fi
		echo "$FILENAME : [$LINE] -> [$NEWLINE]"
		FLG=1
	done < $FILENAME
	
	if [ $FLG -eq 1 ] ; then
		CNT=`expr $CNT + 1`
	fi
done

if [ $CNT -eq 0 ] ; then
	echo "无匹配文件"
	exit 0
fi

printf "涉及文件数量%d个，确认替换文件内容? " $CNT
read YN
if [ x"$YN" != x"y" ] ; then
	exit 0
fi

CNT=0
for FILENAME in `ls -d $FILES` ; do
	grep "$SRCSTR" $FILENAME > /dev/null
	if [ $? -eq 0 ] ; then
		cat $FILENAME | sed "s/$SRCSTR/$DSTSTR/g" > /tmp/bstr.$$
		mv /tmp/bstr.$$ $FILENAME
		
		CNT=`expr $CNT + 1`
	fi
done
printf "完成，共处理了%d个文件\n" $CNT