#!/bin/bash
#
#  fftw.SlackBuild is free software; you can redistribute
#  it and/or modify it under the terms of the GNU General Public License as
#  published by the Free Software Foundation; either version 2 of the License,
#  or any later version.
#
#  fftw.SlackBuild is distributed in the hope that it will
#  be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
#  Public License for more details.
#
#  You should have received a copy of the GNU General Public License along
#  with this program; if not, write to the Free Software Foundation, Inc.,
#  59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
#
# slackbuild for fftw, by Silvio Rhatto
# requires:  
# tested: fftw-3.2
#

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

# Set variables
CWD="$(pwd)"
SRC_NAME="fftw"
PKG_NAME="fftw"
ARCH=${ARCH:=i486}
SRC_VERSION=${VERSION:=3.2}
PKG_VERSION="$(echo "$SRC_VERSION" | tr '[[:blank:]-]' '_')"
BUILD=${BUILD:=1rha}
SRC_DIR=${SRC_DIR:=$CWD}/$PKG_NAME
TMP=${TMP:=/tmp}
PKG=${PKG:=$TMP/package-$PKG_NAME}
REPOS=${REPOS:=$TMP}
PREFIX=${PREFIX:=/usr}
PKG_WORK="$TMP/$SRC_NAME"
CONF_OPTIONS=${CONF_OPTIONS:="--enable-shared --enable-float"}
NUMJOBS=${NUMJOBS:=""}

# Set system libraries' path and optmization flags based on $ARCH
LIBDIR="$PREFIX/lib"

if [ "$ARCH" = "i386" ]; then
  SLKCFLAGS="-O2 -march=i386 -mcpu=i686"
elif [ "$ARCH" = "i486" ]; then
  SLKCFLAGS="-O2 -march=i486 -mcpu=i686"
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686"
elif [ "$ARCH" = "s390" ]; then
  SLKCFLAGS="-O2"
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIR="$PREFIX/lib64"
  LDFLAGS="-L/lib64 -L/usr/lib64"
fi

# Set error codes (used by 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;     ERROR_VCS=41;       ERROR_MKDIR=42

# Clean up any leftovers of previous builds
rm -rf "$PKG_WORK" 2> /dev/null
rm -rf "$PKG" 2> /dev/null

# Create directories if necessary
mkdir -p "$SRC_DIR" || exit $ERROR_MKDIR
mkdir -p "$PKG" || exit $ERROR_MKDIR
mkdir -p "$REPOS" || exit $ERROR_MKDIR
mkdir -p "$PKG_WORK" || exit $ERROR_MKDIR

# Dowload source if necessary
SRC="$SRC_NAME-$VERSION.tar.gz"
URL="http://www.fftw.org/$SRC"

if [ ! -s "$SRC_DIR/$SRC" ] || ! gunzip -t "$SRC_DIR/$SRC" 2> /dev/null; then
  wget "$URL" -O "$SRC_DIR/$SRC" || exit $ERROR_WGET
fi

# Untar
cd "$PKG_WORK"
tar --no-same-owner --no-same-permissions -xvf "$SRC_DIR/$SRC" || exit $ERROR_TAR
PKG_SRC="$PWD/`ls -l | awk '/^d/ { print $NF }'`"
cd "$PKG_SRC"

# Patch source
patches="
         $PKG_NAME.diff $PKG_NAME-$PKG_VERSION.diff
         $PKG_NAME-$PKG_VERSION-$ARCH.diff $PKG_NAME-$ARCH.diff"
for patch in $patches; do
  if [ -f "$CWD/$patch" ]; then
    patch -Np1 < "$CWD/$patch" || exit $ERROR_PATCH
  elif [ -f "$CWD/patches/$patch" ]; then
    patch -Np1 < "$CWD/patches/$patch" || exit $ERROR_PATCH
  elif [ -f "$CWD/$patch.gz" ]; then
    gzip -dc "$CWD/$patch.gz" | patch -Np1 || exit $ERROR_PATCH
  elif [ -f "$CWD/patches/$patch.gz" ]; then
    gzip -dc "$CWD/patches/$patch.gz" | patch -Np1 || exit $ERROR_PATCH
  fi
done

if echo [[PATCH URLS]] | grep -q -v "PATCH URLS"; then
  for patch_url in [[PATCH URLS]]; do
    patch="`basename $patch_url`"
    if [ ! -s "$SRC_DIR/$patch" ]; then
      wget "$patch_url" -O "$SRC_DIR/$patch" || exit $ERROR_WGET
    fi
    if [ "`basename $patch .gz`" != "$patch" ]; then
      gzip -dc $SRC_DIR/$patch | patch -Np1 || exit $ERROR_PATCH
    elif [ "`basename $patch .bz2`" != "$patch" ]; then
      bzip2 -dc $SRC_DIR/$patch | patch -Np1 || exit $ERROR_PATCH
    else
      patch -Np1 < "$SRC_DIR/$patch" || exit $ERROR_PATCH
    fi
  done
fi

# Thanks to Kyle Guinn <elyk at 3@gmail.com> for the section below,
# obtained from http://slackbuilds.org/slackbuilds/12.1/libraries/fftw/fftw.SlackBuild
# Small changes by Rhatto

# compile fftw3
CFLAGS= \
CXXFLAGS= \
FFLAGS= \
./configure \
  --prefix=/usr \
  --sysconfdir=/etc \
  --libdir="$LIBDIR" \
  --localstatedir=/var \
  --mandir=/usr/man \
  --infodir=/usr/info \
  --docdir=/usr/doc/fftw-$PKG_VERSION \
  --enable-shared \
  --disable-static \
  --enable-threads || exit $ERROR_CONF
make $NUMJOBS || exit $ERROR_MAKE
make install-strip DESTDIR="$PKG" || exit $ERROR_INSTALL
make clean || exit $ERROR_MAKE

# compile fftw3f
CFLAGS= \
CXXFLAGS= \
FFLAGS= \
./configure \
  --prefix=/usr \
  --sysconfdir=/etc \
  --libdir="$LIBDIR" \
  --localstatedir=/var \
  --mandir=/usr/man \
  --infodir=/usr/info \
  --docdir=/usr/doc/fftw-$PKG_VERSION \
  --enable-shared \
  --disable-static \
  --enable-threads \
  --enable-float || exit $ERROR_CONF
make $NUMJOBS || exit $ERROR_MAKE
make install-strip DESTDIR="$PKG" || exit $ERROR_INSTALL
make clean || exit $ERROR_MAKE

# compile fftw3l
CFLAGS= \
CXXFLAGS= \
FFLAGS= \
./configure \
  --prefix=/usr \
  --sysconfdir=/etc \
  --libdir="$LIBDIR" \
  --localstatedir=/var \
  --mandir=/usr/man \
  --infodir=/usr/info \
  --docdir=/usr/doc/fftw-$PKG_VERSION \
  --enable-shared \
  --disable-static \
  --enable-threads \
  --enable-long-double || exit $ERROR_CONF
make $NUMJOBS || exit $ERROR_MAKE
make install-strip DESTDIR="$PKG" || exit $ERROR_INSTALL

# Strip binaries
( cd "$PKG"
  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
)

# Install documentation
DOCS="AUTHORS CONVENTIONS COPYING COPYRIGHT ChangeLog NEWS README TODO"
mkdir -p "$PKG/usr/doc/$PKG_NAME-$PKG_VERSION" || exit $ERROR_MKDIR
for doc in $DOCS; do
  if [ -f "$doc" ]; then
    cp -a $doc "$PKG/usr/doc/$PKG_NAME-$PKG_VERSION"
  fi
done

# Add package description (slack-desc)
mkdir -p "$PKG/install" || exit $ERROR_MKDIR
cat << EODESC > "$PKG/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---------------------------------------------------------|
fftw: fftw (the fastest fourier transform in the west)
fftw:
fftw: FFTW is a C subroutine library for computing the discrete Fourier
fftw: transform (DFT) in one or more dimensions, of arbitrary input size,
fftw: and of both real and complex data (as well as of even/odd data, i.e.
fftw: the discrete cosine/sine transforms or DCT/DST). We believe that FFTW,
fftw: which is free software, should become the FFT library of choice for
fftw: most applications.
fftw:
fftw:
fftw:
EODESC

# Build the package
cd "$PKG"
makepkg -l y -c n "$REPOS/$PKG_NAME-$PKG_VERSION-$ARCH-$BUILD.tgz" || exit $ERROR_MKPKG

# Delete source and build directories if requested
if [ "$CLEANUP" == "yes" ] || [ "$1" = "--cleanup" ]; then
  rm -rf "$PKG_WORK" "$PKG"
fi