#!/bin/sh

# Slackware build script for python3

# Copyright 2012-2016 Audrius Kažukauskas <audrius@neutrino.lt>
# 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.

PRGNAM=python3
VERSION=${VERSION:-3.6.0}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

CWD=$(pwd)
TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

# Don't set any SLKCFLAGS here, or OPT="$SLKCFLAGS" before the ./configure.
# Python gets the compile options right without any help.
if [ "$ARCH" = "i586" ]; then
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  LIBDIRSUFFIX="64"
else
  LIBDIRSUFFIX=""
fi

PYVER=$(cut -d. -f1,2 <<< "$VERSION")

set -eu

# Location for Python site-packages.
SITEPK=$PKG/usr/lib${LIBDIRSUFFIX}/python${PYVER}/site-packages
# Same as above without $PKG.
TOOLSDIR=/usr/lib${LIBDIRSUFFIX}/python${PYVER}/site-packages

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

patch -p1 -i $CWD/patches/python3.readline.set_pre_input_hook.diff
# We don't want a large libpython*.a.
patch -p1 -i $CWD/patches/python3.no-static-library.diff

if [ "$ARCH" = "x86_64" ]; then
  # Install to lib64 instead of lib.
  patch -p1 -i $CWD/patches/python3.x86_64.diff
fi

# Fix python3 path in cgi.py.
sed -i '1s|^#.*/usr/local/bin/python|#!/usr/bin/python3|' Lib/cgi.py

# If system we're building on already has Python3 with pip in site-packages,
# ignore it and install pip anyway.
sed -i 's|\("install",\)|\1 "--ignore-installed",|' Lib/ensurepip/__init__.py

chown -R root:root .
find -L . \
 \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
  -o -perm 511 \) -exec chmod 755 {} \; -o \
 \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

./configure \
  --prefix=/usr \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --mandir=/usr/man \
  --docdir=/usr/doc/$PRGNAM-$VERSION \
  --with-threads \
  --enable-ipv6 \
  --enable-shared \
  --with-system-expat \
  --with-system-ffi \
  --build=$ARCH-slackware-linux

make
make install DESTDIR=$PKG

# Restore original ensurepip behaviour.
sed -i 's| "--ignore-installed",||' \
  $PKG/usr/lib${LIBDIRSUFFIX}/python${PYVER}/ensurepip/__init__.py

# Remove to avoid overwriting a copy from Python2.
rm -f $PKG/usr/bin/2to3

# We'll install the python-tools under site-packages.
mkdir -p $SITEPK
cp -a Tools/* $SITEPK

# Remove DOS batch/exe files.
find $PKG \( -name '*.exe' -o -name '*.bat' \) -exec rm -f '{}' \;

# Fix permissions on dynamic libraries.
find $PKG -type f -perm 555 -exec chmod 755 '{}' \;

# Install docs.
mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a README LICENSE Misc $PKG/usr/doc/$PRGNAM-$VERSION
mv $SITEPK/README $PKG/usr/doc/$PRGNAM-$VERSION/README.python-tools
( cd $PKG/usr/doc/$PRGNAM-$VERSION ; ln -sf $TOOLSDIR Tools )
if [ -e "$CWD/python-$VERSION-docs-html.tar.bz2" ]; then
  tar xf $CWD/python-$VERSION-docs-html.tar.bz2
  mv python-$VERSION-docs-html $PKG/usr/doc/$PRGNAM-$VERSION/html
  chown -R root:root $PKG/usr/doc/$PRGNAM-$VERSION/html
fi

find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

find $PKG/usr/man -type f -exec gzip -9 {} \;
for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done

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:-tgz}