#!/bin/tcsh -f
#
# applypatch:  this script will apply the lame patch against 
#              the dist10 encoder source. 
#
# version 1.0 by ???
# version 2.0 by Conrad Sanderson
#
# example
# -------
#
#  first create a directory with:  dist10.tar.gz
#                                  lame3.50.patch.gz
#
#  run from within that directory: applypatch lame3.50.patch.gz
#

if ($# < 1 ) then 
	echo "$0 is a script to apply the lame patch against"
	echo "the ISO dist10 source.  It must be run from a directory"
	echo "containing dist10.tar.gz, dist10.tar or dist10.tgz file"
	echo "and the lame patch file - eg. lame3.50.patch.gz or lame3.50.patch"
	echo " "
	echo "usage: $0 lame_patch_file"
	exit -1
endif

set patch=$1

#
# see if dist10.tar.gz, dist10.tar or dist10.tgz exist
#

set distsrc="nothing"

if(-e dist10.tar.gz) then
	set distsrc=dist10.tar.gz
endif

if(-e dist10.tar) then
	set distsrc=dist10.tar
endif

if(-e dist10.tgz) then
	set distsrc=dist10.tgz
endif


if( $distsrc == "nothing" ) then
	echo "can't find ISO dist10 source (dist10.tar.gz, dist10.tar or dist10.tgz)"
	exit -1
endif

#
# see if patch file exists
#

if(! -e $patch) then
	echo "$patch doesn't exist"
	exit -1
endif

#
# figure out whether dist10 is compressed 
#

set dcatcmd=cat
set dext=$distsrc:e

if($dext == gz) then
	set dcatcmd=zcat
endif

if($dext == tgz) then
	set dcatcmd=zcat
endif

#
# figure out whether the patch is compressed
#

set pcatcmd=cat
set pext=$patch:e

if($pext == gz) then
	set pcatcmd=zcat
endif

# 
# real work begins here
#

set dir = $cwd

# untar the dist10 source
echo "extracting the ISO dist10 source..."
$dcatcmd $distsrc | tar xf -

cd dist10/lsf

# create a copy of the dist10 encoder directory, without tables subdirectory
tar cf - encoder | ( cd $dir ; tar xf -)
cd $dir
rm -Rf encoder/tables

# apply the patch
$pcatcmd $patch | patch -p0 

# rename the directory
mv encoder lame_src


# clean up
rm -Rf dist10

echo "lame MP3 encoder source is in lame_src directory"