#!/bin/sh
#
# ax-make: Alex' Simple Makefile System
# Copyright (c)2014 Alexander Barton (alex@barton.de)
#
# 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.
#

NAME=`basename "$0"`

Usage() {
	echo "Usage: $NAME [-2|-3|-l <lic>] [<lib-dir>]"
	echo
	echo '  -2           Use the GNU GPLv2 for the COPYING file.'
	echo '  -3           Use the GNU GPLv3 for the COPYING file.'
	echo '  -l <lic>     Specify license to use for the COPYING file:'
	echo '               <lic> can be "gpl2", "gpl3", "lgpl21", "lgpl3".'
	echo '               By default an empty COPYING file is created.'
	echo
	echo "  <lib-dir>    Library directory. Default: current working directory."
	echo
	exit 2
}

Download() {
	URL="$1"
	FILE="$2"

	echo "Downloading $URL to $FILE ..."

	curl --version >/dev/null 2>&1
	if [ $? -eq 0 ]; then
		curl -#o "$FILE" "$URL" && return 0
		echo "Failed to download $URL! [curl]"
		return 1
	fi

	wget --version >/dev/null 2>&1
	if [ $? -eq 0 ]; then
		wget -qO "$FILE" --show-progress "$URL" && return 0
		echo "Failed to download $URL! [wget]"
		return 1
	fi

	echo "Can't download $URL, no download tool found!"
	return 1
}

LIB_D="."
LICENSE=""

while true; do
	case "$1" in
		"-2")
			LICENSE="gpl2"
			;;
		"-3")
			LICENSE="gpl3"
			;;
		"-l")
			LICENSE="$2"
			shift
			;;
		"-"*)
			Usage
			;;
		*)
			break
			;;
	esac
	shift
done

[ $# -gt 1 ] && Usage

[ -n "$1" ] && LIB_D="$1"

if [ -r "/usr/local/share/ax-make/Makefile.ax" ]; then
	MAKEFILE_AX="/usr/local/share/ax-make/Makefile.ax"
elif [ -r "/usr/share/ax-make/Makefile.ax" ]; then
	MAKEFILE_AX="/usr/share/ax-make/Makefile.ax"
else
	echo "$NAME: No source \"Makefile.ax\" found!"
	echo "$NAME: Please check your installation of \"ax-make\" and try again."
	exit 1
fi

# -- Makefile.ax --

if [ ! -d "$LIB_D" ]; then
	mkdir -pv "$LIB_D" || exit 1
fi

target="$LIB_D/`basename "$MAKEFILE_AX"`"
if [ ! -e "$target" -o "$MAKEFILE_AX" -nt "$target" ]; then
	echo "Updating \"$target\" ..."
	cp -v "$MAKEFILE_AX" "$target" || exit 1
else
	echo "Makefile \"$target\" is up to date."
fi

# -- Project Makefile's ---

if [ ! -e "Makefile" ]; then
echo "Creating \"Makefile\" ..."
[ "$LIB_D" != "." ] && subdirs="$LIB_D" || subdirs=""
cat >"Makefile" <<EOF
#
# Makefile
#

SUBDIRS = $subdirs

include $LIB_D/Makefile.ax
EOF
fi

if [ "$LIB_D" != "." -a ! -e "$LIB_D/Makefile" ]; then
echo "Creating \"$LIB_D/Makefile\" ..."
cat >"$LIB_D/Makefile" <<EOF
#
# Makefile
#

include Makefile.ax
EOF
fi

# --- Standard project files ---

if [ ! -e AUTHORS ]; then
	if git --version >/dev/null 2>&1; then
		echo "Creating \"AUTHORS\" file ..."
		echo "`git config user.name` <`git config user.email`>" >>AUTHORS
	fi
fi

if [ ! -e COPYING ]; then
	LICENSE_URL=""
	case "$LICENSE" in
		"")
			;;
		"gpl2")
			LICENSE_URL="http://www.gnu.org/licenses/gpl-2.0.txt"
			;;
		"gpl3")
			LICENSE_URL="http://www.gnu.org/licenses/gpl-3.0.txt"
			;;
		"lgpl21")
			LICENSE_URL="https://www.gnu.org/licenses/lgpl-2.1.txt"
			;;
		"lgpl3")
			LICENSE_URL="https://www.gnu.org/licenses/lgpl-3.0.txt"
			;;
		*)
			echo "Can't setup unknown \"$LICENSE\" license!"
			;;
	esac
	[ -n "$LICENSE_URL" ] && Download "$LICENSE_URL" COPYING
else
	[ -n "$LICENSE" ] && echo "COPYING file already exists, skipping."
fi

for f in AUTHORS COPYING README; do
	if [ ! -e "$f" ]; then
		echo "Creating empty \"$f\" file ..."
		touch "$f"
	fi
done

exit 0