#!/bin/bash

# Slackware build script for obcpl

# Written by B. Watson (urchlay@slackware.uk)

# Licensed under the WTFPL. See http://www.wtfpl.net/txt/copying/ for details.

# 20230103 bkw: BUILD=3, fix broken LIBHDR symlink in doc dic.

# 20210906 bkw: BUILD=2
# - fix build on -current
# - add missing docs to docdir
# - compile and install the stuff from util/*.b
# - add some example code

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

PRGNAM=obcpl
VERSION=${VERSION:-0.9.8}
BUILD=${BUILD:-3}
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 [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
tar xvf $CWD/$PRGNAM-$VERSION.tar.xz
cd $PRGNAM-$VERSION
chown -R root:root .
find -L .  -perm /111 -a \! -perm 755 -a -exec chmod 755 {} \+ -o \
        \! -perm /111 -a \! -perm 644 -a -exec chmod 644 {} \+

# Fix a return-without-value from a non-void function. This warning
# was there all along, but in 14.2 it didn't seem to cause a
# problem. Now it makes the 'cg' binary segfault. So:
patch -p1 < $CWD/fix_segfault.diff

cd src
ln -s sys_linux.s sys.s

sed -i \
  -e 's,/usr/local,/usr,g' \
  -e "s,\<lib/$PRGNAM,lib$LIBDIRSUFFIX/$PRGNAM,g" \
  *

make CFLAGS="$SLKCFLAGS" PREFIX="/usr"

# Not quite ready to install: the PREFIX override doesn't entirely work
# because the st binary was built from st.O (obcpl's parsed syntax tree
# format) which has the /usr/local/lib path baked into it (not affected
# by the sed command, above). st.O is distributed this way because obcpl
# needs to be buildable on a system without an existing BCPL compiler. So
# we need to regenerate st.O from st.b (its BCPL source), then rebuild
# st from st.O. This works because st will look for its includes in the
# current dir first. This is the sort of thing gcc has 'make bootstrap'
# for...

rm -f st.O
./st < st.b > st.O
rm -f st st.s st.o
make st

# Now we're good to go.
make PREFIX="$PKG/usr" install

gzip $PKG/usr/man/man1/$PRGNAM.1

# Use a symlink instead of a hard link here:
rm -f $PKG/usr/lib$LIBDIRSUFFIX/$PRGNAM/libhdr
ln -s LIBHDR $PKG/usr/lib$LIBDIRSUFFIX/$PRGNAM/libhdr

# 20210906 bkw: build utils too. have to use a custom obcpl wrapper
# that runs the uninstalled binaries and make sure LIBHDR can be found
# in the current dir (see above). Install them with obcpl- prefix
# because 'gpm' is a conflict with Slackware's gpm, and 'xref' is
# a pretty generic name (can't guarantee there's no other xref command
# on SBo).

cd ../util
sed "/^d=/s,=.*,=../src," < ../src/obcpl > ./obcpl
ln -s ../src/LIBHDR .
chmod +x ./obcpl
make BC=./obcpl
mkdir -p $PKG/usr/bin
for i in cmpltest xref gpm; do
  install -s -m0755 $i $PKG/usr/bin/obcpl-$i
done
make clean # so the util/ in the docdir will be just the source
rm -f ./obcpl
cd ..

# util/ is included as example code. Also our own examples/ dir.

PKGDOC=$PKG/usr/doc/$PRGNAM-$VERSION
mkdir -p $PKGDOC/examples
cp -a C* README doc/*.txt util $PKGDOC
for i in $CWD/examples/*; do
  cat $i > $PKGDOC/examples/$( basename $i )
done
cat $CWD/$PRGNAM.SlackBuild > $PKGDOC/$PRGNAM.SlackBuild

# 20230103 bkw: fix broken symlink in util.
rm -f $PKGDOC/util/LIBHDR
ln -s ../../../lib$LIBDIRSUFFIX/$PRGNAM/LIBHDR $PKGDOC/util/LIBHDR

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