#!/bin/bash
#  Copyright (C) 2010-2012  Matias A. Fonzo, <selk@dragora.org>
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.

set -e

set_sane_permissions() {
  chown -R 0:0 .
  find . \
   \( -perm 2777 -o \
      -perm 777  -o \
      -perm 775  -o \
      -perm 711  -o \
      -perm 555  -o \
      -perm 511     \
   \) -exec chmod 755 {} + \
    -o \
   \( -perm 666 -o \
      -perm 664 -o \
      -perm 600 -o \
      -perm 444 -o \
      -perm 440 -o \
      -perm 400    \
   \) -exec chmod 644 {} +
}

CWD=$(pwd)

TMP=${TMP:-/tmp/sources}
OUT=${OUT:-/tmp/packages}

P=emacs
V=${V:-23.4}
ARCH=${ARCH:-x86_64}
B=${B:-1}

# Flags for the compiler:
DCFLAGS=${DCFLAGS:=-O2 -mtune=generic}

# Parallel jobs for the compiler:
JOBS=${JOBS:=-j7}

PKG=${TMP}/package-${P}

rm -rf $PKG
mkdir -p $PKG $OUT

echo "Uncompressing the tarball..."
rm -rf ${TMP}/${P}-${V}
tar -xvf ${CWD}/${P}-${V}.tar.lz -C $TMP

cd ${TMP}/${P}-${V}
set_sane_permissions

# Build the X11 version of Emacs:
CFLAGS="$DCFLAGS" \
CXXFLAGS="$DCFLAGS" \
./configure \
 --prefix=/usr \
 --libdir=/usr/lib64 \
 --sysconfdir=/etc \
 --infodir=/usr/info \
 --mandir=/usr/man \
 --docdir=/usr/doc/${P}-${V} \
 --localstatedir=/var \
 --program-prefix= \
 --program-suffix= \
 --with-x \
 --with-x-toolkit=gtk \
 --build=${ARCH}-dragora-linux-gnu
make $JOBS || make;
make install DESTDIR=$PKG

# Without hard links:
( cd ${PKG}/usr/bin
  rm -f emacs-${V}
  mv emacs emacs-x11
  ln -s emacs-x11 emacs
)

# Build the Console version of Emacs:
cd $TMP
rm -rf ${P}-${V}
tar -xf ${CWD}/${P}-${V}.tar.lz
cd ${P}-${V}

CFLAGS="$DCFLAGS" \
CXXFLAGS="$DCFLAGS" \
./configure \
 --prefix=/usr \
 --libdir=/usr/lib64 \
 --sysconfdir=/etc \
 --infodir=/usr/info \
 --mandir=/usr/man \
 --docdir=/usr/doc/${P}-${V} \
 --localstatedir=/var \
 --program-prefix= \
 --program-suffix= \
 --without-x \
 --build=${ARCH}-dragora-linux-gnu
make $JOBS || make;
install -m 1755 src/emacs -D ${PKG}/usr/bin/emacs-console

chown -R 0:games ${PKG}/var/games/emacs/  # Sane ownerships.

# Strip binaries & libraries:
( cd $PKG
  find . -type f | xargs file | awk '/ELF/ && /executable/ || /shared object/' | \
   cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true;
)

# This can be provided by the ctags/etags package:
( cd ${PKG}/usr
  ( cd bin
    mv ctags ctags-emacs
    ln -s ctags-emacs ctags
  )
  ( cd man/man1
    rm -f ctags.1  # Don't look to etags man page.
    mv etags.1 etags-emacs.1
    ln -s etags-emacs.1 etags.1
    ln -s etags-emacs.1 ctags.1
  )
)

# Overwrite with our .desktop file:
mkdir -p ${PKG}/usr/share/applications
zcat ${CWD}/emacs.desktop.gz \
 > ${PKG}/usr/share/applications/emacs.desktop

# Compress and link manpages:
( cd ${PKG}/usr/man
  find . -type f -exec gzip -9N '{}' +
  find . -type l | while read file ; do
    ln -sf $(readlink $file).gz ${file}.gz
    rm $file
  done
)

# Compress manual(s):
( cd ${PKG}/usr/info
  rm -f dir  # Redundancy.
  find . -type f -exec gzip -9N '{}' +
)

# Copy the documentation:
mkdir -p ${PKG}/usr/doc/${P}-${V}
cp -a \
 BUGS COPYING ChangeLog README \
 ${PKG}/usr/doc/${P}-${V}

# Copy the description files:
mkdir -p ${PKG}/description
cp ${CWD}/description/?? ${PKG}/description

# Add the post install script:
mkdir -p ${PKG}/install
zcat ${CWD}/post-install.gz > ${PKG}/install/post-install

cd $PKG
makepkg -l ${OUT}/${P}-${V}-${ARCH}-${B}.tlz