#! /bin/bash -e

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

### hardcode PKG and tarball 
export PKG=cygutils
export VER=1.3.4
export BLD=4
export SYS=msys
_sysver=$(uname -r)
export SYSVER=${_sysver%%\(*}
FULLPKG=${PKG}-${VER}-${BLD}-${SYS} # not sysver
SRCDIR_=${PKG}-${VER}
RELDOCDIR=share/doc/${PKG}/${VER}
BIN1PKG=${PKG}-${VER}-${BLD}-${SYS}-${SYSVER}-bin.tar.lzma
BIN2PKG=${PKG}-dos2unix-${VER}-${BLD}-${SYS}-${SYSVER}-bin.tar.lzma
DEVPKG=libpopt-${VER}-${BLD}-${SYS}-${SYSVER}-dev.tar.lzma
LICPKG=${PKG}-${VER}-${BLD}-${SYS}-${SYSVER}-lic.tar.lzma
DOCPKG=${PKG}-${VER}-${BLD}-${SYS}-${SYSVER}-doc.tar.lzma
SRCPKG=${PKG}-${VER}-${BLD}-${SYS}-${SYSVER}-src.tar.lzma
BIN1_CONTENTS="--exclude bin/conv.exe \
	--exclude bin/dos2unix.exe \
	--exclude bin/unix2dos.exe \
	--exclude bin/u2d.exe \
	--exclude bin/d2u.exe \
	bin"
BIN2_CONTENTS="bin/conv.exe bin/dos2unix.exe bin/unix2dos.exe bin/u2d.exe bin/d2u.exe"
LIC_CONTENTS="${RELDOCDIR}/COPYING ${RELDOCDIR}/licenses"
DOC_CONTENTS="--exclude ${RELDOCDIR}/COPYING \
	--exclude ${RELDOCDIR}/licenses \
	share/doc share/man"

# 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=" --use-compress-program=xz" ;;
        *tar.gz | *tgz ) cmparg="z" ;;
        *              ) cmparg="" ;;
        esac
}

specific_patchlevel=
do_patch() {
  #local patchfile_name;
  #local patchfile_path;
  #local patchlevel;
  if [ -n "$specific_patchlevel" ]
  then
    starting_patchlevel=$specific_patchlevel
    stopping_patchlevel=$specific_patchlevel
  else
    starting_patchlevel=0
    stopping_patchlevel=3
  fi
  specific_patchlevel=

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

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

    patchlevel=$starting_patchlevel

    while test $patchlevel -le $stopping_patchlevel
    do
      if patch -N -s --dry-run -p${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" ;;
    *.tar.xz )  srcdir=`echo $1 | sed -e 's/\.tar\.xz$//'`
                unpack=txz
                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 ;;
  txz ) inform "unpacking $1" ; tar --use-compress-program=xz -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}
  chmod -R u+w *
  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:-"${opt_flags} -D__CYGWIN__"}
export CPPFLAGS="${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"

# NO SPACES!!
export PATH=`pwd`:/bin:/usr/local/bin:/mingw/bin:/c/WINDOWS/system32:/c/WINDOWS

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


msys_conf_prep() {
  inform "Preparing ${PKG}"
  cd ${srcdir}
  ./bootstrap
  cd ${builddir}
}

msys_conf () {
  confargs="--prefix=${PREFIX} \
	--datarootdir=\${prefix}/share --docdir=\${prefix}/${RELDOCDIR}
	--enable-silent-rules"

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

msys_build () {
  inform "Building ${PKG}"
  make V=0
}

msys_check () {
  :
}

msys_install () {
  inform "Installing ${PKG}"
  make install DESTDIR=${instdir}

  verbose mkdir -p ${instdir}${PREFIX}/${RELDOCDIR}
  verbose cp -p ${srcdir}/ChangeLog* \
	${srcdir}/AUTHORS \
	${srcdir}/BRANCHES \
	${srcdir}/COPYING \
	${srcdir}/HOW-TO-CONTRIBUTE \
	${srcdir}/NEWS \
	${srcdir}/PROGLIST \
	${srcdir}/README \
	${srcdir}/TODO ${instdir}${PREFIX}/${RELDOCDIR}

  verbose /usr/bin/install -d -m 755 ${instdir}${PREFIX}/share/doc/MSYS
  verbose /usr/bin/install -m 644 ${abovedir}/msys-cygutils.RELEASE_NOTES \
	${instdir}${PREFIX}/share/doc/MSYS/${PKG}-${VER}-${BLD}-${SYS}.RELEASE_NOTES.txt

  inform "Removing unnecessary files"
  verbose rm -f ${instdir}${PREFIX}/bin/ascii.exe
  verbose rm -f ${instdir}${PREFIX}/bin/banner.exe
  verbose rm -f ${instdir}${PREFIX}/bin/dump.exe
  verbose rm -f ${instdir}${PREFIX}/bin/msys-icons-0.dll
  verbose rm -f ${instdir}${PREFIX}/bin/realpath.exe
  verbose rm -f ${instdir}${PREFIX}/${RELDOCDIR}/cygicons/README
  verbose rmdir ${instdir}${PREFIX}/${RELDOCDIR}/cygicons || /bin/true
  verbose rm -f ${instdir}${PREFIX}/include/cygicons.h
  verbose rmdir ${instdir}${PREFIX}/include || /bin/true
  verbose rm -f ${instdir}${PREFIX}/lib/libcygicons.dll.a
  verbose rm -f ${instdir}${PREFIX}/lib/libcygicons.la
  verbose rmdir ${instdir}${PREFIX}/lib/ || /bin/true

  inform "Other fixups"
  verbose cp -p ${instdir}${PREFIX}/bin/lpr-basic.exe \
	${instdir}${PREFIX}/bin/lpr.exe
  verbose mv ${instdir}${PREFIX}/share/man/man1/lpr.1 \
	${instdir}${PREFIX}/share/man/man1/lpr-basic.1
  verbose /usr/bin/install -m 644 ${srcdir}/src/lpr/lpr-msys.1 \
	${instdir}${PREFIX}/share/man/man1/lpr.1
}

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

  set_cmparg "${BIN1PKG}"
  tar cv${cmparg} --hard-dereference -f ${abovedir}/${BIN1PKG} ${BIN1_CONTENTS}

  set_cmparg "${BIN2PKG}"
  tar cv${cmparg} --hard-dereference -f ${abovedir}/${BIN2PKG} ${BIN2_CONTENTS}

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

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


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

msys_conf_prep
msys_conf
msys_build
msys_check
msys_install
msys_package

cd "$savedir"

