#!/bin/bash
#
# slackbuild script for libpng
# by rhatto at riseup.net
#
# some code grabbed from slackware 11.0 and slamd64-11.0 scripts, found at
# ftp://ftp.slackware.com/pub/slackware/slackware-11.0/source/l/libpng/ and
# http://slamd64.he.net/slamd64-11.0/source/l/libpng/libpng.SlackBuild
#

if [ -s "slack-required" ]; then
  echo Recomended and required packages for building libpng are:
  cat slack-required | sed -e 's/^/\t/'
  if [ "$INTERACT" != "no" ]; then
    echo If you dont have those installed, press Ctrl-C. Otherwise, hit ENTER.
    read crap
#  else
#    echo Sleeping 3 seconds...
#    sleep 3
  fi
fi

CWD="`pwd`"

if [ -f ~/.slackbuildrc ]; then
  source ~/.slackbuildrc
elif [ -f /etc/slackbuildrc ]; then
  source /etc/slackbuildrc
fi

# default settings
PACKAGE="libpng"
ARCH=${ARCH:=i486}
VERSION=${VERSION:=1.2.29}
BUILD=${BUILD:=1rha}
SRC_DIR=${SRC:=$CWD}
TMP=${TMP:=/tmp}
REPOS=${REPOS:=$TMP}

if [ "$ARCH" == "x86_64" ]; then
  export LDFLAGS="-L/lib64 -L/usr/lib64"
  LIBDIR=/usr/lib64
else
  LIBDIR=/usr/lib
fi

# -------  error codes for createpkg  --------------
ERROR_WGET=31;      ERROR_MAKE=32;      ERROR_INSTALL=33
ERROR_MD5=34;       ERROR_CONF=35;      ERROR_HELP=36
ERROR_TAR=37;       ERROR_MKPKG=38;     ERROR_GPG=39
ERROR_PATCH=40

RTOOL="wget"
PACKAGE_EXT="gz"
SRC="$PACKAGE-$VERSION.tar.$PACKAGE_EXT"
URL="http://ufpr.dl.sourceforge.net/sourceforge/libpng/$SRC"

SRC_DIR="$SRC_DIR/$PACKAGE"
mkdir -p $SRC_DIR

if [ "$RTOOL" == "wget" ] && [ ! -f "$SRC_DIR/$SRC" ]; then
  wget "$URL" -O "$SRC_DIR/$SRC" || exit $ERROR_WGET
fi

TMP="$TMP/$PACKAGE"
rm -rf $TMP
mkdir -p $TMP
cd $TMP

tar xvf $SRC_DIR/$SRC || exit $ERROR_TAR
cd $PACKAGE-$VERSION

if [ -f "$CWD/$PACKAGE-$VERSION.diff" ]; then
  patch -p1 < $CWD/$PACKAGE-$VERSION.diff || exit $ERROR_PATCH
fi

chown -R root:root .
find . -perm 664 -exec chmod 644 {} \;
find . -perm 600 -exec chmod 644 {} \;
find . -perm 444 -exec chmod 644 {} \;
find . -perm 400 -exec chmod 644 {} \;
find . -perm 440 -exec chmod 644 {} \;
find . -perm 777 -exec chmod 755 {} \;
find . -perm 775 -exec chmod 755 {} \;
find . -perm 511 -exec chmod 755 {} \;
find . -perm 711 -exec chmod 755 {} \;
find . -perm 555 -exec chmod 755 {} \;

if [ "$ARCH" == "x86_64" ]; then

  # Do *NOT* move this... put here in Slamd64 so that libdir
  # can be overriden and so that we don't have inline assembly problems
  # - if you change this, rebuilding libpng will break, and 
  # you'll have to rebuild everything that links to it (e.g. KDE).
  zcat $CWD/libpng.libs.diff.gz | patch -p1 --verbose || exit $ERROR_PATCH
  ln -sf scripts/makefile.linux ./Makefile

  ./configure --prefix=/usr --libdir=$LIBDIR || exit $ERROR_CONF

else

  ./configure --prefix=/usr --libdir=$LIBDIR || exit $ERROR_CONF
  zcat $CWD/libpng.libs.diff.gz | patch -p1 --verbose || exit $ERROR_PATCH
  ln -sf scripts/makefile.linux ./Makefile

fi

make || exit $ERROR_MAKE
make DESTDIR=$TMP/package-$PACKAGE install || exit $ERROR_INSTALL

CWD="`pwd`"

cd $TMP/package-$PACKAGE

# This symlink is needed to keep old applications running:
( cd usr/lib
  if [ ! -e libpng.so.0 -a -e libpng.so.3 ]; then
    ln -sf libpng.so.3 libpng.so.0
  fi
)

find . | xargs file | grep "executable" | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null
find . | xargs file | grep "shared object" | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null

gzip -9 usr/man/man?/*

mkdir install
cat << EOF > install/slack-desc
# HOW TO EDIT THIS FILE:
# The "handy ruler" below makes it easier to edit a package description.  Line
# up the first '|' above the ':' following the base package name, and the '|'
# on the right side marks the last column you can put a character in.  You must
# make exactly 11 lines for the formatting to be correct.  It's also
# customary to leave one space after the ':'.

      |-----handy-ruler------------------------------------------------------|
libpng: libpng (Portable Network Graphics library)
libpng:
libpng: PNG (Portable Network Graphics) is an extensible file format for the
libpng: lossless, portable, well-compressed storage of raster images.  PNG
libpng: provides a patent-free replacement for GIF and can also replace many
libpng: common uses of TIFF.  Indexed-color, grayscale, and truecolor images
libpng: are supported, plus an optional alpha channel.  Sample depths range
libpng: from 1 to 16 bits.
libpng:
libpng:
libpng:
EOF

# docs
mkdir -p usr/doc/$PACKAGE-$VERSION

DOCS="ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO libpng.txt example.c"

for file in $DOCS; do
  cp $CWD/$file* usr/doc/$PACKAGE-$VERSION/
done

makepkg -c y -l y $REPOS/$PACKAGE-$VERSION-$ARCH-$BUILD.tgz || exit $ERROR_MKPKG

if [ "$CLEANUP" == "yes" ]; then
  rm -rf $TMP
fi