#!/bin/bash

# Slackware build script for fasm

# Written by B. Watson (yalhcru@gmail.com)

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

# Note: the source archive includes the full source plus prebuilt 32-
# and 64-bit binaries. This SlackBuild uses the prebuilt binary to
# bootstrap the binary it's going to install.

# I almost didn't bother with an x86_64 option. The assembler is
# 32-bit but fully static, will run fine on 64-bit without multilib,
# and there doesn't seem to be any advantage to using the 64-bit
# native binary... but upstream provides it, so I do too. Plus the
# tools need help on Slackware64 due to lack of multilib.

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

PRGNAM=fasm
VERSION=${VERSION:-1.73.29}
BUILD=${BUILD:-1}
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

# Build will fail on non-x86/x86_64. Let's fail ASAP though, not
# bother to extract the source.
case "$ARCH" in
  i?86|x86_64) ;; # OK
  *) cat <<EOF
*** $PRGNAM can only be built and run on i586, i686, or x86_64 (not '$ARCH')
EOF
exit 1
esac

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}

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM
tar xvf $CWD/$PRGNAM-$VERSION.tgz
cd $PRGNAM

if [ "$ARCH" = "x86_64" ]; then
  SRCDIR=source/Linux/x64
  FASM="$(pwd)/fasm.x64"
  tar xvf $CWD/fasm-prebuilt-tools-$VERSION.tar.xz
else
  FASM="$(pwd)/fasm"
  SRCDIR=source/Linux
fi

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 {} \+

# Bootstrap using the prebuilt binary.
cd $SRCDIR
$FASM fasm.asm

# The binary we just built should be byte-for-byte identical with
# the prebuilt one. If not, this will error out of the script.
cmp $FASM fasm

# Note: do not attempt to strip this (no section headers).
mkdir -p $PKG/usr/bin
install -m0755 fasm $PKG/usr/bin/fasm

cd -

# Build the tools, if we're on 32-bit. For 64-bit we use prebuilt
# statically-linked tools, since we don't have a 32-bit libc for them
# to link with. The prebuilt tools just came from running this script
# on i586, then tarring up the binaries. For some reason, the Debian
# fasm package doesn't include compiled tools, though it does include
# the sources for them (even the win32 source).

cd tools/libc
for i in listing prepsrc symbols; do
  # if the file exists, it's prebuilt, we won't (and can't) build it.
  if [ ! -e $i ]; then
    $FASM $i.asm
    gcc -static -Wl,-s -o $i $i.o
  fi
  install -m0755 -oroot -groot $i $PKG/usr/bin/$i
done
cd -

# Man page written for this SlackBuild. Debian had one already,
# but it's not very detailed and is missing the -d option.
mkdir -p $PKG/usr/man/man1
gzip -9c < $CWD/$PRGNAM.1 > $PKG/usr/man/man1/$PRGNAM.1.gz

PKGDOC=$PKG/usr/doc/$PRGNAM-$VERSION
mkdir -p $PKGDOC
mv tools/readme.txt tools-readme.txt
cp -a *.txt tools/*.txt examples $PKGDOC
cat $CWD/$PRGNAM.SlackBuild > $PKGDOC/$PRGNAM.SlackBuild

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