#! /bin/bash -e

# NOTE: should be invoked as either:
#    ./msys-build-expat expat-VER.tar.gz
#    which will unpack the "pristine" source distribution, patch it, 
#    and begin the build,
# OR, as
#    ../msys-build-expat
#    where the current working directory is the unpacked and patched
#    source distribution.

### hardcode PKG and patches tarball
export PKG=expat
export VER=2.0.1
export BLD=1
export SYS=msys
_sysver=$(uname -r)
export SYSVER=${_sysver%%\(*}
FULLPKG=${PKG}-${VER}-${BLD}-${SYS} # not sysver
SRCDIR_=${PKG}-${VER}
RELDOCDIR=share/doc/${PKG}/${VER}
BINPKG=${PKG}-${VER}-${BLD}-${SYS}-${SYSVER}-bin.tar.lzma
DEVPKG=lib${PKG}-${VER}-${BLD}-${SYS}-${SYSVER}-dev.tar.lzma
DLLPKG=lib${PKG}-${VER}-${BLD}-${SYS}-${SYSVER}-dll-1.tar.lzma
DOCPKG=${PKG}-${VER}-${BLD}-${SYS}-${SYSVER}-doc.tar.lzma
LICPKG=${PKG}-${VER}-${BLD}-${SYS}-${SYSVER}-lic.tar.lzma
SRCPKG=${PKG}-${VER}-${BLD}-${SYS}-${SYSVER}-src.tar.lzma
BIN_CONTENTS='bin/*.exe'
DEV_CONTENTS='include/ lib/'
DLL_CONTENTS='bin/*.dll'
DOC_CONTENTS="--exclude=${RELDOCDIR}/COPYING share/doc/ share/man/"
LIC_CONTENTS="${RELDOCDIR}/COPYING"

# displays error message and exits
error() {
        case $? in
                0) local errorcode=1 ;;
                *) local errorcode=$? ;;
        esac

        echo -e "\e[1;31m*** ERROR:\e[0;0m ${1:-no error message provided}";
        exit ${errorcode};
}

# displays information message
inform() {
        echo -e "\e[1;32m*** Info:\e[0;0m ${1}";
}

# displays warning message only
warning() {
        echo -e "\e[1;33m*** Warning:\e[0;0m ${1}";
}

# query
query() {
	while true
	do
          echo -e "\e[1;35m*** Query:\e[0;0m ${1}";
	  if read -e answer
	  then
	    query_result=$answer
	    return 0
	  else
	    # user did a ^D
	    echo -e "Quitting.\n"
	    exit 1
	  fi
	done
}

# displays command to stdout before execution
verbose() {
        echo "${@}"
        "${@}"
        return $?
}
export -f verbose warning inform error

cmparg=
set_cmparg() {
        case "$1" in
        *tar.bz2       ) cmparg="j" ;;
        *tar.lzma      ) cmparg=" --lzma" ;;
        *tar.xz        ) cmparg="J" ;;
        *tar.gz | *tgz ) cmparg="z" ;;
        *              ) cmparg="" ;;
        esac
}

do_patch() {
  #local patchfile_name;
  #local patchfile_path;
  #local patchlevel;

  for patchfile_path
  do
    patchfile_name="${patchfile_path##*/}"

    if [ ! -e ${patchfile_path} ]
    then
      warning "patch ${patchfile_name} not found";
      continue;
    fi

    patchlevel=0;

    while test $patchlevel -le 3
    do
      if patch -N -s --dry-run -p${patchlevel} -i ${patchfile_path} &> /dev/null
      then
        echo "*** applying patch ${patchfile_name}:";
        patch -N -p${patchlevel} -i ${patchfile_path} || error "patch ${patchfile_name} failed"
        break;
      elif patch -N -s --binary --dry-run -p${patchlevel} -i ${patchfile_path} &> /dev/null
      then
        echo "*** applying patch ${patchfile_name}:";
        patch -N --binary -p${patchlevel} -i ${patchfile_path} || error "patch ${patchfile_name} failed"
        break;
      elif patch -R -s --dry-run -p${patchlevel} -i ${patchfile_path} &> /dev/null
      then
        warning "patch ${patchfile_name} already applied; skipping";
        break;
      else
        if (( patchlevel == 3 ))
        then
          error patch "patch ${patchfile_name} will not apply";
        else
          patchlevel=`expr $patchlevel + 1`;
          continue;
        fi
      fi
    done
  done
}
export -f do_patch


if [ "x" != "x$1" ]; then
  if [ -d "$1" ]; then
    savedir="$PWD"
    cd "$1"
    srcdir="$PWD"
  elif [ -f "$1" ]; then
    case "$1" in
    *.tar.bz2 ) srcdir=`echo $1 | sed -e 's/\.tar\.bz2$//'`
                unpack=tbz
                savedir="$PWD" ;;
    *.tar.gz  ) srcdir=`echo $1 | sed -e 's/\.tar\.gz$//'`
                unpack=tgz
                savedir="$PWD" ;;
    *.zip     ) srcdir=`echo $1 | sed -e 's/\.zip$//'`
                unpack=zip
                savedir="$PWD" ;;
    *.tar.lzma ) srcdir=`echo $1 | sed -e 's/\.tar\.lzma$//'`
                unpack=tlz
                savedir="$PWD" ;;
    * ) error "Bad src directory specified: $1" ;;
    esac
  else
    error "Bad src directory specified: $1"
  fi
else
  savedir="$PWD"
  srcdir="$PWD"
fi

if [ "$MSYSTEM" != "MSYS" ]
then
  echo "You must be in an MSYS shell to use this script"
  exit 1
fi

if [ -n "$unpack" ] ; then
  case "$unpack" in
  tbz ) inform "unpacking $1" ; tar xjf $1 ;;
  tgz ) inform "unpacking $1" ; tar xzf $1 ;;
  zip ) inform "unpacking $1" ; unzip -q $1 ;;
  tlz ) inform "unpacking $1" ; tar --lzma -xf $1 ;;
  * ) error "unknown pack format" ;;
  esac
  if [ -n "${SRCDIR_}" ]; then
    if [ ! -d "${SRCDIR_}" ]; then
      echo "src package $1 does not unpack into assumed srcdir $SRCDIR_"
      exit 1
    fi
    srcdir=`cd ${SRCDIR_} && pwd`
  fi
  if [ ! -d "$srcdir" ]; then
    echo "src package $1 does not unpack into assumed srcdir $srcdir"
    exit 1
  fi


  cd ${srcdir}
  do_patch ${savedir}/${FULLPKG}.patch

  cd ${savedir}
  srcdir=`cd $srcdir; pwd`
fi


abovedir=`cd ${srcdir}/..; pwd`
PREFIX=/usr

opt_flags="-O3 -fno-unit-at-a-time -s -march=i386 -mtune=i686"
export CFLAGS=${CFLAGS:-"${opt_flags}"}
export CPPFLAGS=${CPPFLAGS:-"-D__CYGWIN__"}
export CXXFLAGS=${CXXFLAGS:-"${opt_flags}"}
export F77FLAGS=${F77FLAGS:-"${opt_flags}"}
export GCJFLAGS=${GCJFLAGS:-"${opt_flags}"}
export LDFLAGS="${LDFLAGS} -Wl,--enable-auto-import"
export PATH=`pwd`:/bin:/usr/local/bin:/mingw/bin

mkdir -p ${abovedir}/_build
builddir=${abovedir}/_build
mkdir -p ${abovedir}/_inst
instdir=${abovedir}/_inst
cd ${builddir}

msys_conf_prep() {
  inform "Preparing ${PKG}"
  cd ${srcdir}
  cp /usr/share/automake-1.11/config.guess conftools/
  cp /usr/share/automake-1.11/config.sub   conftools/
  for f in libtool.m4 ltoptions.m4 ltsugar.m4 ltversion.m4 lt~obsolete.m4
  do
    cp /usr/share/aclocal/$f conftools
  done
  autoreconf -fvi || error 'autoreconf failed'
  cd ${builddir}
}

msys_conf () {
  inform "Configuring ${PKG}"

  confargs="--prefix=${PREFIX} \
    --datarootdir=\${prefix}/share \
	--docdir=\${prefix}/${RELDOCDIR}"

  ${srcdir}/configure --srcdir=${srcdir} ${confargs} \
	LDFLAGS="${LDFLAGS}" \
	CFLAGS="${CFLAGS}"
}

msys_build () {
  inform "Building ${PKG}"
  make || error "Build failed"
}

msys_check () {
  inform "Checking ${PKG}"
  make -k check || error "Check failed"
}

msys_install () {
  inform "Installing ${PKG}"
  make install DESTDIR=${instdir} || error "Install failed" 

  verbose /usr/bin/install -d ${instdir}${PREFIX}/share/doc/MSYS
  verbose /usr/bin/install -m 644 ${abovedir}/msys-expat.RELEASE_NOTES \
          ${instdir}${PREFIX}/share/doc/MSYS/${PKG}-${VER}-${BLD}-${SYS}.RELEASE_NOTES.txt
  verbose /usr/bin/install -d ${instdir}${PREFIX}/${RELDOCDIR}
  cd ${srcdir}
  verbose /usr/bin/install -m 644 COPYING Changes README doc/* \
          ${instdir}${PREFIX}/${RELDOCDIR}
  verbose rm -f ${instdir}${PREFIX}/${RELDOCDIR}/xmlwf.1
  verbose rm -f ${instdir}${PREFIX}/${RELDOCDIR}/xmlwf.sgml

  find ${instdir} -name "*.exe" -print0 | xargs -0 strip
  find ${instdir} -name "*.exe" -print0 | xargs -0 chmod +x
  find ${instdir} -name "*.dll" -print0 | xargs -0 strip
  find ${instdir} -name "*.dll" -print0 | xargs -0 chmod +x
}

msys_package () {
  inform "Packaging ${PKG}"
  cd ${instdir}${PREFIX}

  set_cmparg "${BINPKG}"
  tar cv${cmparg} --hard-dereference -f ${abovedir}/${BINPKG} ${BIN_CONTENTS}

  set_cmparg "${DLLPKG}"
  tar cv${cmparg} --hard-dereference -f ${abovedir}/${DLLPKG} ${DLL_CONTENTS}

  set_cmparg "${DOCPKG}"
  tar cv${cmparg} --hard-dereference -f ${abovedir}/${DOCPKG} ${DOC_CONTENTS}

  set_cmparg "${LICPKG}"
  tar cv${cmparg} --hard-dereference -f ${abovedir}/${LICPKG} ${LIC_CONTENTS}

  set_cmparg "${DEVPKG}"
  tar cv${cmparg} --hard-dereference -f ${abovedir}/${DEVPKG} ${DEV_CONTENTS}

  cd ${abovedir}
  set_cmparg "${SRCPKG}"
  tar cv${cmparg} -f ./${SRCPKG} \
    ${PKG}-${VER}.tar.gz \
    ${FULLPKG}.patch \
    msys-expat.RELEASE_NOTES \
    msys-build-expat
}

msys_conf_prep
msys_conf
msys_build
msys_check
msys_install
msys_package

cd "$savedir"

