#!/bin/bash -e

# 
# A script to produce the Qt declaration files
#
# This script utilizes the extraction framework from mkqtdecl_common. The extraction
# framework is based on a C++ parser and a configuration file that specifies details
# about the translation.
#
# By default, the script will take the Qt headers from /opt/qt/4.6.3 and /opt/qt/5.5.1
# for Qt4 and Qt5 respectively.
#
# Call it from project level as
#
#   ./scripts/mkqtdecl.sh -update        # Qt4
#   ./scripts/mkqtdecl.sh -update -qt5   # Qt5
# 
# For more options see 
#
#   ./scripts/mkqtdecl.sh -h
#
# 
# Copyright (C) 2006-2017 Matthias Koefferlein
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

dry=0
sync=0
update=0
diff=0
reuse=0
qt="/opt/qt/4.6.3/include"
qt5="/opt/qt/5.5.1/include"
inst_dir_common=`pwd`/scripts/mkqtdecl_common
inst_dir4=`pwd`/scripts/mkqtdecl4
inst_dir5=`pwd`/scripts/mkqtdecl5
src_dir=`pwd`/src
src_name4=gsiqt4
src_name5=gsiqt5

src_name=$src_name4
inst_dir=$inst_dir4

while [ "$1" != "" ]; do

  a="$1"
  shift

  case "$a" in
  -h)
    echo "Produce Qt declaration"
    echo "Usage:"
    echo "  mkqtdecl.sh -update                 Produce and synchronize"
    echo "  mkqtdecl.sh -dry                    Dry run - produce, but don't synchronize"
    echo "  mkqtdecl.sh -sync                   Sync only - don't produce, but synchronize"
    echo "  mkqtdecl.sh -diff                   Show differences - don't produce and don't synchronize"
    echo "  mkqtdecl.sh -qt path_to_include     Use the specified include path"
    echo "  mkqtdecl.sh -qt5                    Use setup for Qt 5.x (use before -qt)"
    echo "  mkqtdecl.sh -reuse                  Don't parse C++ container again"
    exit 0
    ;;
  -dry)
    dry=1
    ;;
  -sync)
    sync=1
    ;;
  -update)
    update=1
    ;;
  -diff)
    diff=1
    ;;
  -reuse)
    reuse=1
    ;;
  -qt)
    qt="$1"
    shift
    ;;
  -qt5)
    qt="$qt5"
    inst_dir="$inst_dir5"
    src_name="$src_name5"
    ;;
  *)
    echo "*** ERROR: unknown command option $a"
    exit 1
    ;;
  esac

done

if [ `expr $update + $sync + $dry + $diff` != 1 ]; then
  echo "*** ERROR: either -update, -diff, -dry or -sync must be given"
  exit 1
fi

# Production flags
# -diff   ->  update=0, dry=1
# -dry    ->  update=1, dry=1
# -sync   ->  update=0, dry=0
# -update ->  update=1, dry=0
if [ $diff != 0 ]; then
  dry=1
elif [ $dry != 0 ]; then
  update=1
fi

if [ ! -e $src_dir ]; then 
  echo "*** ERROR: Source directory ($src_dir) not found - run script in repository root"
  exit 1
fi
if [ ! -e $inst_dir ]; then
  echo "*** ERROR: Installation path ($inst_dir) not found - run script in repository root"
  exit 1
fi
if [ ! -e $inst_dir_common ]; then
  echo "*** ERROR: Installation path ($inst_dir_common) not found - run script in repository root"
  exit 1
fi
if ! ruby -v >/dev/null 2>&1; then
  echo "*** ERROR: ruby not installed"
  exit 1
fi
if ! ruby -e "require 'oj'" 2>&1; then
  echo "*** ERROR: ruby gem 'oj' not installed"
  exit 1
fi
if ! ruby -e "require 'treetop'" 2>&1; then
  echo "*** ERROR: ruby gem 'treetop' not installed"
  exit 1
fi

work_dir="./mkqtdecl.tmp"

if [ $update != 0 ]; then  

  if [ -e $work_dir ] && [ $reuse == 0 ]; then
    rm -rf $work_dir
  fi

  mkdir -p $work_dir
  cd $work_dir

  cp $inst_dir/{allofqt.cpp,mkqtdecl.conf,mkqtdecl.properties,mkqtdecl.events} .
  cp $inst_dir_common/{cpp_parser_classes.rb,cpp_classes.rb,c++.treetop,parse.rb,reader_ext.rb,produce.rb} .

  if [ $reuse == 0 ]; then

    echo "Running gcc preprocessor .."
    # By using -D_GCC_LIMITS_H_ we make the gcc not include constants such as ULONG_MAX which will 
    # remain as such. This way the generated code is more generic.
    gcc -I$qt -fPIC -D_GCC_LIMITS_H_ -E -o allofqt.x allofqt.cpp 

    echo "Stripping hash lines .."
    egrep -v '^#' <allofqt.x >allofqt.e
    rm allofqt.x

    echo "Parsing and producing db .."
    ./parse.rb -i allofqt.e -o allofqt.db

  fi

  mkdir -p generated

  echo "Producing code .."
  ./produce.rb -i allofqt.db

else 
  cd $work_dir 
fi  

if [ ! -e generated ]; then
  echo "*** ERROR: production output ("`pwd`"/generated) does not exist - production failed?"
  exit 1
fi

cd generated

if [ $dry != 0 ]; then
  echo "Synchronizing dry run .."
else
  echo "Synchronizing .."
fi

count=0
for f in {*.cc,*.h} qtdecl.pri; do
  needs_update=0
  if ! [ -e $src_dir/$src_name/$f ]; then
    echo "# INFO: creating new file $src_dir/$src_name/$f"
    needs_update=1
  elif ! cmp -s $f $src_dir/$src_name/$f; then
    echo "# INFO: out of date: syncing file $src_dir/$src_name/$f"
    needs_update=1
  fi
  if [ $needs_update != 0 ]; then
    count=`expr $count + 1`
    if [ $dry != 0 ]; then
      echo cp $f $src_dir/$src_name/$f
    else
      echo === cp $f $src_dir/$src_name/$f
      cp $f $src_dir/$src_name/$f
    fi
  fi
done

if [ $dry != 0 ]; then
  echo "# INFO: $count files to synchronize"
else
  echo "# INFO: $count files synchronized"
fi