#!/bin/sh

# Copyright 2008, 2009, 2010, 2011, 2013, 2014, 2015, 2016  Patrick J. Volkerding, Sebeka, Minnesota, USA
# 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.

PKGNAM=screen
VERSION=${VERSION:-$(echo $PKGNAM-*.tar.?z* | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-1}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) export ARCH=i586 ;;
    arm*) export ARCH=arm ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
       *) export ARCH=$( uname -m ) ;;
  esac
fi

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
elif [ "$ARCH" = "s390" ]; then
  SLKCFLAGS="-O2"
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
else
  SLKCFLAGS="-O2"
fi

CWD=$(pwd)
TMP=${TMP:-/tmp}
PKG=$TMP/package-screen

NUMJOBS=${NUMJOBS:-" -j7 "}

rm -rf $PKG
mkdir -p $TMP $PKG
cd $TMP
rm -rf screen-$VERSION
tar xvf $CWD/screen-$VERSION.tar.?z* || exit 1

cd screen-$VERSION || exit 1

chown -R root:root .
find . \
  \( -perm 777 -o -perm 775 -o -perm 711 -o -perm 555 -o -perm 511 \) \
  -exec chmod 755 {} \; -o \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
  -exec chmod 644 {} \;

# Apply patches taken from Debian:
for pf in \
  26source_encoding.patch.gz \
  45suppress_remap.patch.gz \
  52fix_screen_utf8_nfd.patch.gz \
  ; do zcat $CWD/$pf | patch --verbose -p1 || exit 1
done

# Revert a change to /etc/screenrc introduced in screen-4.3.x that prevents
# the console from being properly cleared when detaching from a screen session:
zcat $CWD/60-revert-screenrc-change.diff.gz | patch -p1 --verbose || exit 1

# Do not link against libelf:
zcat $CWD/screen.no_libelf.diff.gz | patch -p1 --verbose || exit 1

# Reconf after patching configure.ac:
autoreconf -vif

# Configure:
CFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --sysconfdir=/etc \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --mandir=/usr/man \
  --infodir=/usr/info \
  --with-sys-screenrc=/etc/screenrc \
  --with-pty-mode=0620 \
  --with-pty-group=5 \
  --disable-pam \
  --enable-telnet \
  --disable-socket-dir \
  --enable-use-locale \
  --enable-colors256 \
  --enable-rxvt_osc \
  --build=$ARCH-slackware-linux || exit 1

# Substitutions:
perl -pi -e 's|.*#undef HAVE_BRAILLE.*|#define HAVE_BRAILLE 1|' config.h
perl -pi -e 's|/usr/local/etc/screenrc|/etc/screenrc|' etc/etcscreenrc doc/*
perl -pi -e 's|/local/etc/screenrc|/etc/screenrc|' doc/*

# Build screen:
make $NUMJOBS || make || exit 1
make install DESTDIR=$PKG || exit 1

# Prepare package:
( 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
)

# Sorry, pal.  Not around here.
chmod 755 $PKG/usr/bin/screen-$VERSION
mkdir -p $PKG/etc/skel
cat etc/etcscreenrc > $PKG/etc/screenrc.new
cat etc/screenrc > $PKG/etc/skel/.screenrc.new
rm -f $PKG/usr/info/dir
gzip -9 $PKG/usr/info/*
gzip -9 $PKG/usr/man/man1/*
mkdir -p $PKG/usr/doc/screen-$VERSION
chmod 644 doc/FAQ
cp -a COPYING ChangeLog HACKING INSTALL NEWS README TODO \
  doc/FAQ doc/README.DOTSCREEN \
  $PKG/usr/doc/screen-$VERSION
mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc
cat << EOF > $PKG/install/doinst.sh
#!/bin/sh
config() {
  NEW="\$1"
  OLD="\$(dirname \$NEW)/\$(basename \$NEW .new)"
  # If there's no config file by that name, mv it over:
  if [ ! -r \$OLD ]; then
    mv \$NEW \$OLD
  elif [ "\$(cat \$OLD | md5sum)" = "\$(cat \$NEW | md5sum)" ]; then # toss the redundant copy
    rm \$NEW
  fi
  # Otherwise, we leave the .new copy for the admin to consider...
}
config etc/screenrc.new
config etc/skel/.screenrc.new
# This is probably safer than leaving the hidden .new file...  maybe?
rm -f etc/skel/.screenrc.new
EOF

# Build package:
cd $PKG
makepkg -l y -c n $TMP/screen-$VERSION-$ARCH-$BUILD.txz

