#!/bin/bash

# Slackware build script for zita-convolver

# Written by B. Watson (yalhcru@gmail.com)

# Licensed under the WTFPL. See http://sam.zoy.org/wtfpl/ for details.

# This SlackBuild has a bit more logic than most, due to the various
# optimizations. See README for executive summary.

PRGNAM=zita-convolver
VERSION=${VERSION:-3.1.0}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i486 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

CWD=$(pwd)
TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

# Allow the user to use -O2 (like a regular slackbuild) instead of
# the -O3 the zita-convolver author uses.
if [ "${FORCE_O2:-no}" = "yes" ]; then
  OPTFLAG="-O2"
else
  OPTFLAG="-O3"
fi

# Source is smart enough to know about lib vs. lib64, no need for
# LIBDIRSUFFIX here.
if [ "$ARCH" = "i486" ]; then
  SLKCFLAGS="$OPTFLAG -march=i486 -mtune=i686"
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="$OPTFLAG -march=i686 -mtune=i686"
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="$OPTFLAG -fPIC"
else
  SLKCFLAGS="$OPTFLAG"
fi

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
tar xvf $CWD/$PRGNAM-$VERSION.tar.bz2
cd $PRGNAM-$VERSION
chown -R root:root .
find -L . \
 \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 -o -perm 511 \) \
 -exec chmod 755 {} \; -o \
 \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
 -exec chmod 644 {} \;

cd libs

# Fix 'make install' so it strips, and so we don't waste time running ldconfig
sed -i -e 's/install -m 755/& -s/' -e '/ldconfig$/d' Makefile

# Autodetection for MMX
if [ "${MMX:-auto}" = "auto" ]; then
  if grep -q '\<mmx\>' /proc/cpuinfo; then
    MMX=yes
  else
    MMX=no
  fi
fi

# Autodetection for SSE
if [ "${SSE:-auto}" = "auto" ]; then
  if grep -q '\<sse\>' /proc/cpuinfo; then
    SSE=yes
  else
    SSE=no
  fi
fi

# MMX is now "yes" or "no" whether it was autodetected or explicitly
# set, we're ready to tweak the Makefile
if [ "$MMX" = "yes" ]; then
  SLKCFLAGS="$SLKCFLAGS -mmmx"
elif [ "$MMX" != "no" ]; then
  echo "MMX set to invalid value $MMX (must be blank, or one of 'yes' 'no' 'auto')" 1>&2
  exit 1
fi

# Same as above, for SSE
if [ "$SSE" = "yes" ]; then
  SLKCFLAGS="$SLKCFLAGS -msse -mfpmath=sse"
elif [ "$SSE" != "no" ]; then
  echo "SSE set to invalid value $SSE (must be blank, or one of 'yes' 'no' 'auto')" 1>&2
  exit 1
fi

# First, ditch the hard-coded -O3 upstream shipped us:
sed -i -e "s/-O3//" Makefile

# Set CPPFLAGS according to user options.
sed -i -e "s/-march=.*/$SLKCFLAGS/" Makefile

# Done dorking with the Makefile, we now return to regular SlackBuild stuff
make
make install PREFIX=$PKG/usr

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a \
  ../README ../AUTHORS ../COPYING \
  $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

mkdir -p $PKG/install

# Include the MMX/SSE options in the slack-desc, in case the user has to build
# several packages (this will help keep them straight)
sed \
  -e "s/@MMX@/$MMX/" \
  -e "s/@SSE@/$SSE/" \
  $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}