#!/bin/sh
cd "$(dirname $0)"
#******************************************************************************#
# Defaults                                                                     #
#******************************************************************************#
# Project variables
name="$(make -s getname)"
version="$(make -s getversion)"

# Maintainer
maintainer="$(make -s getmaintainer)"

# Target
target=""

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

# Make options
make_full_log=

# Build options
loglevel=none # none, info, warn, error, fatal

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

# Installation options
install_manpages=yes
install_devel=yes

#******************************************************************************#
# 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

Build options:
  --target=TARGET           the target (if none, native)
  --loglevel=LOGLEVEL       library log level [$loglevel]

Installation options:
  --noinstall-manpages      should not install manpages
  --noinstall-devel         should not install developement files

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

Fine tuning of the installation directories:
  --bindir=DIR              executables [$bindir]
  --pkgdir=DIR              pkg-config configurations directory [$pkgdir]
  --libdir=DIR              library files of the linker [$libdir]
  --includedir=DIR          include files for the compiler [$includedir]
  --mandir=DIR              man root [$mandir]

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 "$arg" in
--target=*) target="${arg#*=}" ;;
--make-full-log) make_full_log=yes ;;
--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=$level ;;
--noinstall-manpages) install_manpages= ;;
--noinstall-devel) install_devel= ;;
--root=*) root="${arg#*=}" ;;
--prefix=*) prefix="${arg#*=}"; prefix_set=y ;;
--bindir=*) bindir="${arg#*=}" ;;
--pkgdir=*) pkgdir="${arg#*=}" ;;
--libdir=*) libdir="${arg#*=}" ;;
--includedir=*) includedir="${arg#*=}" ;;
--mandir=*) mandir="${arg#*=}" ;;
*) echo "$arg: didn't read" ;;
esac; done

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

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

#******************************************************************************#
# Create Makefile configuration                                                #
#******************************************************************************#
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

# Build options
 TARGET = $target
 LOG_LEVEL = $loglevel

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

# Installation options
 INSTALL_MANPAGES = $install_manpages
 INSTALL_DEVEL = $install_devel

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

#******************************************************************************#
# Finish                                                                       #
#******************************************************************************#
echo "Configuration loaded, you can make now."

# End of file.