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

# Make options
make_full_log=
more_warnings=

# Build options
target=
windows=
default_zoom=8
default_storage=fls0
BUILD_p7=1
BUILD_p7screen=1
BUILD_p7os=0
BUILD_mcsfile=0

# Installation directories
root=''
prefix='${root}/usr'
bindir='${prefix}/bin'
mandir='${prefix}/share/man'

# Installation options
install_manpages=yes

#
#	Tool name checking
#
check()
{
	if [ $1 = "p7"  ] ||
	[ $1 = "p7screen" ] ||
	[ $1 = "p7os" ] ||
	[ $1 = "mcsfile" ]; then
		return 1 # true if there is a tool
	fi
	return 0 # false if not a tool
}

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

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 build target [$target]
  --default-zoom=ZOOM       the default zoom for \`p7screen\` [$default_zoom]
  --default-storage=STOR    the default storage device [$default_storage]
  --enable-<tool>           build and install the selected tool
  --disable-<tool>          do not build or install the selected tool

Tools:
  p7                        enabled  (default)
  p7screen                  enabled  (default)
  p7os                      disabled (default)
  mcsfile                   disabled (default)

Installation options:
  --noinstall-manpages      do not install manpages

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

Fine tuning of the installation directories:
  --bindir=DIR              user executables, not "dustbin" [$bindir]
  --mandir=DIR              man root [$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=y ;;
--version|-v) put_version=y ;;
esac; done
[ $put_version ] && version
[ $put_help ] && usage

#******************************************************************************#
# Parse arguments                                                              #
#******************************************************************************#
for arg ; do case "$arg" in
--make-full-log) make_full_log=yes ;;
--target=*) target="${arg#*=}" ;;
--maintainer) more_warnings=yes ;;
--default-zoom=*)
	zoom="${arg#*=}"
	if ! [ $zoom -eq $zoom 2>/dev/null ]; then
		echo "--default-zoom: a number is expected (got \"$zoom\")" >&2
	elif [ $zoom -lt 1 ]; then
		echo "--default-zoom: should be 1 or more (got $zoom)" >&2
	elif [ $zoom -gt 16 ]; then
		echo "--default-zoom: should be 16 or less (got $zoom)" >&2
	else default_zoom=$zoom; fi ;;
--default-storage=*)
	storage="${arg#*=}"
	# check if 4 chars long
	if [ ! $(echo "$storage" | wc -c ) -eq 5 ]; then
		echo "$0: --default-storage: must be 4 characters long"
		continue
	fi
	# then set
	default_storage="$storage" ;;
--noinstall-manpages) install_manpages= ;;
--root=*) root="${arg#*=}" ;;
--prefix=*) prefix="${arg#*=}" ;;
--bindir=*) bindir="${arg#*=}" ;;
--mandir=*) mandir="${arg#*=}" ;;
--enable-*)
	tool="${arg#--enable-}"
	if check $tool; then
		echo "error: connot enable $tool: unknown tool"
		exit 1
	fi

	eval BUILD_$tool=1;;
--disable-*)
	tool="${arg#--disable-}"
	if check $tool; then
		echo "error: connot disable $tool: unknown tool"
		exit 1
	fi

	eval BUILD_$tool=0;;
*) echo "$arg: didn't read" ;;
esac; done

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

# Check MS-Windows targets
case "$target" in *-mingw32) windows=y ;; esac

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

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

# If on MS-Windows, do not make the manpages.
[ "$windows" ] && install_manpages=

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

# gen makefile function
gen()
{
	echo "
#!/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
	"

	echo -n "BINARIES :="

	if [ $BUILD_p7 = 1 ]; then 
		echo -n " p7" 
	fi
	if [ $BUILD_p7screen = 1 ]; then 
		echo -n " p7screen" 
	fi
	if [ $BUILD_p7os = 1 ]; then 
		echo -n " p7os" 
	fi
	if [ $BUILD_mcsfile = 1 ]; then 
		echo -n " mcsfile" 
	fi

	echo "
# Build options
TARGET := $target
FOR_WINDOWS := $windows
DEFAULT_ZOOM := $default_zoom
DEFAULT_STORAGE := $default_storage

# Installation directories
IBINDIR := $bindir
IMANDIR := $mandir

# Installation options
INSTALL_MANPAGES := $install_manpages

# End of file.
"
}

gen | tee Makefile.cfg
chmod +x Makefile.cfg

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

# End of file.