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

# Author
author="$(make -s getauthor)"
author_name="$(make -s getauthor_name)"

# Target
target=""

# Make options
make_full_log=

# Build options
default_zoom=8
default_storage=fls0

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

# Installation options
install_manpages=yes

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

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]

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 ${author}.
EOF
exit 0
}

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

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#*=}" ;;
--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#*=}" ;;
*) echo "$arg: didn't read" ;;
esac; done

#******************************************************************************#
# Evaluate variables                                                           #
#******************************************************************************#
for var in prefix bindir 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
 DEFAULT_ZOOM := $default_zoom
 DEFAULT_STORAGE := $default_storage

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

# Installation options
 INSTALL_MANPAGES := $install_manpages

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

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

# End of file.