#!/bin/bash

# Slackware build script for heatshrink

# Copyright 2025, Fernando Lopez Jr.
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

cd $(dirname $0) ; CWD=$(pwd)

PRGNAM=heatshrink
VERSION=${VERSION:-0.4.1}
BUILD=${BUILD:-5}
TAG=${TAG:-_SBo}
PKGTYPE=${PKGTYPE:-tgz}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE"
  exit 0
fi

TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

if [ "$ARCH" = "i586" ]; then
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  LIBDIRSUFFIX="64"
else
  LIBDIRSUFFIX=""
fi

set -eu

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
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 \
 \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
 -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

# Build with -fPIC so the static libraries can be linked into shared objects
# (e.g. libbgcode is built as a shared library and links heatshrink statically).
# heatshrink's Makefile does CFLAGS += ... ${OPTIMIZE}, so overriding OPTIMIZE
# adds -fPIC while keeping the other required flags (-std=c99, warnings).
make OPTIMIZE="-O2 -fPIC"

mkdir -p $PKG/usr/bin
mkdir -p $PKG/usr/lib${LIBDIRSUFFIX}
mkdir -p $PKG/usr/include

install -Dm755 heatshrink -t $PKG/usr/bin
install -Dm644 libheatshrink_static.a $PKG/usr/lib${LIBDIRSUFFIX}
install -Dm644 libheatshrink_dynamic.a $PKG/usr/lib${LIBDIRSUFFIX}
install -Dm644 heatshrink_common.h $PKG/usr/include/
install -Dm644 heatshrink_config.h $PKG/usr/include/
install -Dm644 heatshrink_encoder.h $PKG/usr/include/
install -Dm644 heatshrink_decoder.h $PKG/usr/include/

# Also install the headers under a heatshrink/ subdirectory, which is how some
# consumers include them, e.g. <heatshrink/heatshrink_encoder.h> (libbgcode).
mkdir -p $PKG/usr/include/heatshrink
install -m644 heatshrink_common.h heatshrink_config.h \
  heatshrink_encoder.h heatshrink_decoder.h $PKG/usr/include/heatshrink/

# Install a CMake package config so consumers can locate heatshrink with
# find_package(heatshrink CONFIG) and link the imported targets
# heatshrink::heatshrink (static alloc) / heatshrink::heatshrink_dynalloc
# (dynamic alloc), mapped onto the installed static libraries.
mkdir -p $PKG/usr/lib${LIBDIRSUFFIX}/cmake/heatshrink
cat > $PKG/usr/lib${LIBDIRSUFFIX}/cmake/heatshrink/heatshrinkConfig.cmake <<EOF
if(NOT TARGET heatshrink::heatshrink_dynalloc)
  add_library(heatshrink::heatshrink_dynalloc STATIC IMPORTED)
  set_target_properties(heatshrink::heatshrink_dynalloc PROPERTIES
    IMPORTED_LOCATION "/usr/lib${LIBDIRSUFFIX}/libheatshrink_dynamic.a"
    INTERFACE_INCLUDE_DIRECTORIES "/usr/include")
endif()
if(NOT TARGET heatshrink::heatshrink)
  add_library(heatshrink::heatshrink STATIC IMPORTED)
  set_target_properties(heatshrink::heatshrink PROPERTIES
    IMPORTED_LOCATION "/usr/lib${LIBDIRSUFFIX}/libheatshrink_static.a"
    INTERFACE_INCLUDE_DIRECTORIES "/usr/include")
endif()
EOF
cat > $PKG/usr/lib${LIBDIRSUFFIX}/cmake/heatshrink/heatshrinkConfigVersion.cmake <<'EOF'
set(PACKAGE_VERSION "0.4.1")
if(PACKAGE_VERSION VERSION_LESS PACKAGE_FIND_VERSION)
  set(PACKAGE_VERSION_COMPATIBLE FALSE)
else()
  set(PACKAGE_VERSION_COMPATIBLE TRUE)
  if(PACKAGE_VERSION VERSION_EQUAL PACKAGE_FIND_VERSION)
    set(PACKAGE_VERSION_EXACT TRUE)
  endif()
endif()
EOF

find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a CONTRIBUTING.md LICENSE Makefile README.md $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

rm -f $PKG/usr/lib*/*.la

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

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