#!/bin/sh
# Copyright © 2011 Rafaël Carré
#
# 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 Street, Fifth Floor, Boston MA 02110-1301, USA.

export LC_ALL=
FOUND=

check_version() {
    gotver=$2
    gotmajor=`echo $gotver|cut -d. -f1`
    gotminor=`echo $gotver|cut -d. -f2`
    gotmicro=`echo $gotver|cut -d. -f3|tr -c -d '[:digit:]'`
    [ -z "$gotmicro" ] && gotmicro=0
    needmajor=`echo $3|cut -d. -f1`
    needminor=`echo $3|cut -d. -f2`
    needmicro=`echo $3|cut -d. -f3`
    [ -z "$needmicro" ] && needmicro=0
    if [ "$needmajor" -ne "$gotmajor" ] ||
       [ "$needmajor" -eq "$gotmajor" -a "$needminor" -gt "$gotminor" ] ||
       [ "$needmajor" -eq "$gotmajor" -a "$needminor" -eq "$gotminor" -a "$needmicro" -gt "$gotmicro" ];
    then
        echo "$1 too old"
        NEEDED="$NEEDED $1"
    else
        FOUND="$FOUND $1"
    fi

}

check_version_majmin() {
    gotver=$2
    gotmajor=`echo $gotver|cut -d. -f1`
    gotminor=`echo $gotver|cut -d. -f2`
    needmajor=`echo $3|cut -d. -f1`
    needminor=`echo $3|cut -d. -f2`
    if [ "$needmajor" -ne "$gotmajor" \
         -o "$needminor" -ne "$gotminor" ]
    then
        echo "$1 not compatible"
        NEEDED="$NEEDED $1"
    else
        FOUND="$FOUND $1"
    fi

}

check_tar() {
if ! tar PcJ /dev/null >/dev/null 2>&1
then
    echo "tar doesn't support xz (J option)"
    NEEDED="$NEEDED tar xz"
else
    FOUND="$FOUND tar xz"
fi
}

check_sed() {
tmp="`pwd`/check_sed"
trap "rm \"$tmp\" \"$tmp-e\" 2>/dev/null" EXIT
echo "test file for GNU sed" > $tmp
if ! sed -i -e 's/sed//' $tmp >/dev/null 2>&1
then
    echo "sed doesn't do in-place editing (-i option)"
    NEEDED="$NEEDED sed"
else
    FOUND="$FOUND sed"
fi
}

check_nasm() {
if ! nasm -v >/dev/null 2>&1
then
    echo "nasm not found"
    NEEDED="$NEEDED nasm"
else
    # found, need to check version ?
    if [ -z "$1" ];then
        FOUND="$FOUND nasm"
    else
        gotver=`nasm -v | cut -d ' ' -f 3`
        check_version nasm $gotver $1
    fi
fi
}

check() {
if ! $1 --version >/dev/null 2>&1 && ! $1 -version >/dev/null 2>&1
then
    echo "$1 not found"
    NEEDED="$NEEDED $1"
else
    # found, need to check version ?
    if [ -z "$2" ];then
        FOUND="$FOUND $1"
    else
        gotver=`$1 --version | head -1 | sed s/'.* '//`
        check_version $1 $gotver $2
    fi
fi
}

check_majmin() {
if ! $1 --version >/dev/null 2>&1 && ! $1 -version >/dev/null 2>&1 && ! $1 --version 2>/dev/null
then
    echo "$1 not found"
    NEEDED="$NEEDED $1"
else
    # found, need to check version ?
    if [ -z "$2" ];then
        FOUND="$FOUND $1"
    else
        gotver=`$1 --version | head -1 | sed s/'.* '//`
        check_version_majmin $1 $gotver $2
    fi
fi
}

check autoconf 2.69
check automake 1.15
check m4 1.4.16
check libtool 2.4
check pkg-config
check cmake 3.17.0
check yasm
check_tar
check ragel
check_sed
check protoc 2.6.0
check ant
check xz
check bison 3.0.0
check flex
check_nasm 2.14
check help2man
check meson 0.54.2
check ninja

DEPS_ONLY="help2man"

CPUS=
case `uname` in
    Linux|MINGW32*|MINGW64*)
        CPUS=`getconf _NPROCESSORS_ONLN 2>&1`
     ;;
    Darwin|FreeBSD|NetBSD)
        CPUS=`getconf NPROCESSORS_ONLN 2>&1`
    ;;
    OpenBSD)
        CPUS=`sysctl -n hw.ncpu 2>&1`
    ;;
    SunOS)
        CPUS=`psrinfo | wc -l 2>&1`
    ;;
    *)
        CPUS=1  # default
     ;;
esac

BOOTSTRAP_PATH="$( cd "$(dirname "$0")" ; pwd -P )"

cat > Makefile << EOF
TOOLS = $BOOTSTRAP_PATH
MAKEFLAGS += -j$CPUS
CMAKEFLAGS += --parallel=$CPUS
PREFIX=\$(abspath ./build)
PATH=\${PREFIX}/bin:$PATH
EOF

for t in $FOUND; do
    echo ".$t:" >> Makefile
done

for t in $NEEDED; do
    echo .$t: .build$t >> Makefile
    case "$t" in
        *$DEPS_ONLY*)
            ;; # Dependency only, not build by default
        *)
            PACKAGES="$PACKAGES $t"
            TARGETS="$TARGETS .build$t"
            ;;
    esac
done

[ -n "$PACKAGES" ] && mkdir -p build/bin && echo "To-be-built packages: $PACKAGES"

cat >> Makefile << EOF
all: $TARGETS
	@echo "You are ready to build VLC and its contribs"

include \$(TOOLS)/tools.mak
EOF