#!/bin/sh
cd "$(dirname $0)"
#******************************************************************************#
# Defaults                                                                     #
#******************************************************************************#
# Project variables
[ -f Makefile.cfg ] && mv Makefile.cfg Makefile.cfg.tmp
name="$(make -s getname)"
version="$(make -s getversion)"
maintainer="$(make -s getmaintainer)"
[ -f Makefile.cfg.tmp ] && mv Makefile.cfg.tmp Makefile.cfg

# Platform
platform="$(command -v gcc 1>/dev/null && gcc --print-multiarch)"
platform="$([ "$platform" ] && echo "/$platform")"

# Make options
make_full_log=
more_warnings=

# Build options
target=
no_file=
static=
windows=
optimize_size=
loglevel=none # none, info, warn, error, fatal

# Installation directories
root=''
prefix='${root}/usr'
prefix_set=
hprefix='${root}/usr'
bindir='${prefix}/bin'
hbindir='${hprefix}/bin'
libdir='${prefix}/lib'"$platform"
includedir='${prefix}/include'"$platform"
pkgdir='${libdir}/pkgconfig'
mandir='${prefix}/share/man'

# Installation options
install_manpages=yes
install_devel=yes

# Tweaks
cflags=
ldflags=

#******************************************************************************#
# Help message                                                                 #
#******************************************************************************#
usage() {
cat <<EOF
\`configure\` configures ${name} to adapt to systems that aren't mine.
Usage: $0 [OPTION]

Defaults for the options are specified in brackets.

General options:
  --help                    display this help and exit
  --version                 display version information and quit
  --make-full-log           display full commands while making
  --maintainer              enable maintainer mode

Build options:
  --target=TARGET           the target (if none, native)
  --static                  build a static library (by default, dynamic)
  --windows                 build DLLs and .libs instead of ELF and archives
  --optimize-size           optimize size instead of speed
  --no-file                 do not use the libc FILE interface
  --loglevel=LOGLEVEL       library log level [$loglevel]

Installation options:
  --no-manpages             should not make and install manpages
  --no-devel                should not install developement files

Installation directories:
  --root=ROOT               installation root [$root]
  --prefix=PREFIX           main installation prefix [$prefix]
  --hprefix=HOSTPREFIX      host installation prefix [$hprefix]

Fine tuning of the installation directories:
  --hbindir=HOSTBINDIR      host executables [$hbindir]
  --bindir=BINDIR           target executables [$bindir]
  --pkgdir=PKGDIR           pkg-config configurations directory [$pkgdir]
  --libdir=LIBDIR           library files of the linker [$libdir]
  --includedir=INCDIR       include files for the compiler [$includedir]
  --mandir=MANDIR           man root [$mandir]

Other tweaks:
  CFLAGS=CFLAGS             some more compilation flags
  LDFLAGS=LDFLAGS           some more linker flags

Report bugs to ${maintainer}.
EOF
exit 0
}

#******************************************************************************#
# Version message                                                              #
#******************************************************************************#
version() {
cat <<EOF
${name} configure script v${version}
Hand-written by Thomas "Cakeisalie5" Touhey.

This configure script is free software.
There is NO warranty; not even for MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.
EOF
exit 0
}

#******************************************************************************#
# Check for help and version                                                   #
#******************************************************************************#
put_version=
put_help=
for arg ; do case "$arg" in
--help|-h) put_help=1 ;;
--version|-v) put_version=1 ;;
esac; done
[ $put_version ] && version
[ $put_help ] && usage

#******************************************************************************#
# Parse arguments                                                              #
#******************************************************************************#
for arg ; do case "$arg" in
--make-full-log) make_full_log=yes ;;
--maintainer) more_warnings=yes; loglevel=info; install_manpages= ;;
--target=*) target="${arg#*=}" ;;
--static) static=y ;;
--windows) windows=y ;;
--optimize-size) optimize_size=y ;;
--no-file) no_file=y ;;
--loglevel=*)
	level="${arg#*=}"
	# check if is in array
	if ! [ $level = "info" ] && ! [ $level = "warn" ] \
	&& ! [ $level = "error" ] && ! [ $level = "fatal" ] \
	&& ! [ $level = "none" ]; then
		echo \
"$0 : --loglevel: expected one of [info, warn, error, fatal, none], \
got '$level'"
		continue
	fi
	# then set
	loglevel=$level ;;
--no-manpages) install_manpages= ;;
--no-devel) install_devel= ;;
--root=*) root="${arg#*=}" ;;
--hprefix=*) hprefix="${arg#*=}" ;;
--prefix=*) prefix="${arg#*=}"; prefix_set=y ;;
--hbindir=*) hbindir="${arg#*=}" ;;
--bindir=*) bindir="${arg#*=}" ;;
--pkgdir=*) pkgdir="${arg#*=}" ;;
--libdir=*) libdir="${arg#*=}" ;;
--includedir=*) includedir="${arg#*=}" ;;
--mandir=*) mandir="${arg#*=}" ;;
CFLAGS=*) cflags="${arg#*=}" ;;
LDFLAGS=*) ldflags="${arg#*=}" ;;
*) echo "$arg: didn't read" ;;
esac; done

#******************************************************************************#
# Little things                                                                #
#******************************************************************************#
# Cross-compilation things
if [ ! $prefix_set ] && [ $target ]; then
	prefix="$prefix"/"$target"
fi

# Check MS-Windows targets
win_target=
case "$target" in *-mingw32) if [ ! "$static" ]; then
	windows=y; win_target=y
fi;; esac

# Evaluate variables
vars="prefix bindir libdir pkgdir includedir mandir hprefix hbindir"
for var in $vars; do
	eval $var'='$(eval 'echo $'$var)
done

# Check that static and MS-Windows are not asked.
if [ "$static" ] && [ "$windows" ]; then
cat >&2 <<EOF
Sadly, there is no equivalent of MSVC's LIB.EXE for GNU/Linux.
If you know one, contact the maintainer: see \`./configure --help\`.
EOF
exit 1
fi

# Check that MS-Windows has a target.
if [ "$windows" ] && [ ! "$target" ]; then
cat >&2 <<EOF
You have selected the --windows option, but have selected no target.
If you want to build for native use, use a mingw32/mingw64 target.
If you want to build for a cross-compiling use, specify an other target!
EOF
exit 1
fi

# Check if is on Cygwin
[ "$(expr substr $(uname -s) 1 10)" == "MINGW32_NT" ] && windows=y

# Check that MS-Windows has a mingw* target.
if [ "$windows" ] && [ ! "$win_target" ]; then
cat >&2 <<EOF
You have selected the --windows option, but have not selected a mingw32/mingw64
BFD target. We supposed that it is because you are compiling libg1m for a
cross-compiler compiled for MS-Windows (that's why configuration won't fail).

If it is not, please reconfigure to use a mingw32/mingw64 toolchain!

EOF
fi

#******************************************************************************#
# Create Makefile configuration                                                #
#******************************************************************************#
# Clean before
make mrproper MAKE_FULL_LOG=y 1>/dev/null 2>/dev/null

# Create the configuration header
tools/write-header-config --version=${version} \
	--maintainer="$(echo ${maintainer} | sed 's/"/\\"/g')" \
	$([ "$no_file" ] && echo --no-file) \
	>include/${name}/config.h

# Do it!
exec 3>&1 1>Makefile.cfg
cat <<EOF
#!/usr/bin/make -f
#******************************************************************************#
# Makefile configuration generated by ./configure                              #
#******************************************************************************#
# Configuration version and messages configuration
 CONFIG_VERSION = $version
 MAKE_FULL_LOG = $make_full_log
 MORE_WARNINGS := $more_warnings
 FOR_WINDOWS := $windows

# Build options
 STATIC := $static
 TARGET = $target
 OPTIMIZE_SIZE := $optimize_size
 LOG_LEVEL = $loglevel

# Installation directories
 HBINDIR = $hbindir
 IBINDIR = $bindir
 IPKGDIR = $pkgdir
 ILIBDIR = $libdir
 IINCDIR = $includedir
 IMANDIR = $mandir

# Installation options
 INSTALL_MANPAGES = $install_manpages
 INSTALL_DEVEL = $install_devel

# Other tweaks
 CMOREFLAGS := $cflags
 LDMOREFLAGS := $ldflags

# End of file.
EOF
exec 1>&3 3>&-
chmod +x Makefile.cfg

# Print the end message.
echo "Configuration loaded, you can make now."

# End of file.