configure

#!/bin/sh
# hewwo's configure script
# somewhat inspired by oksh's configure

warn() {
	echo $0: "$@"
}

Makefile() {
	cat <<EOF >Makefile
# generated by ./configure
CFLAGS = -Wall -Wextra -g -O2
LIBS = -lm
OBJS := main.o net.o xdg.o linenoise/linenoise.o linenoise/encodings/utf8.o
BINDIR = $PREFIX/bin
LUADIR = $PREFIX/share/hewwo/$BRANCH

hewwo: \$(OBJS) lua/liblua.a
	\$(CC) \$(LDFLAGS) -o \$@ \$^ \$(LIBS)

lua/liblua.a:
	cd lua; make liblua.a

main.o: main.c hewwo.h
net.o:  net.c  hewwo.h
xdg.o:  xdg.c  hewwo.h config.h

.PHONY: clean install uninstall
clean:
	rm -f hewwo \$(OBJS)

EOF

	if [ -z "$DEVEL" ]; then
		cat <<EOF >>Makefile

.PHONY: install uninstall
install: hewwo
	install -d \${DESTDIR}\${BINDIR}
	install -d \${DESTDIR}\${LUADIR}
	install -c hewwo \${DESTDIR}\${BINDIR}
	install -c *.lua \${DESTDIR}\${LUADIR}

uninstall:
	rm -f \${DESTDIR}\${BINDIR}/hewwo
	@echo Leaving behind \${DESTDIR}\${LUADIR}
	@echo If you don\\'t have any local changes there, feel free to rm -rf that.
EOF
		cat <<EOF >config.h
/* generated by ./configure */
#define LUADIR_LOCAL "/hewwo/$BRANCH"
#define LUADIR_GLOBAL "$PREFIX/share/hewwo/$BRANCH"
EOF
	else
		cat <<EOF >>Makefile
install:
	@echo Not letting you install the development build. See ./configure --help.
	@false

uninstall:
	@echo Not letting you uninstall the development build. See ./configure --help.
	@false
EOF
		cat <<EOF >config.h
/* generated by ./configure */
#define LUADIR_LOCAL "/hewwo/$BRANCH"
#define LUADIR_GLOBAL "$PWD"
EOF
	fi
}

help() {
	cat <<EOF
Usage: ./configure [options]
Options:
  --help or -h       Display this help message
  --prefix=PREFIX    Prepare for installation in PREFIX [$PREFIX]
  --branch=BRANCH    Change the Lua branch [$BRANCH]
  --devel            Look for Lua files in the source directory (here) instead
                     of in PREFIX. If you're hacking on hewwo, this is what you
                     want. Otherwise, stay away.
EOF
}


PREFIX="${PREFIX:-/usr/local}"
BRANCH="edge"
task=Makefile

for opt
do
	case "$opt" in
		--help|-h)
			task=help
			;;
		--prefix=*)
			PREFIX=${opt#*=}
			PREFIX_SET=1
			;;
		--branch=*)
			BRANCH=${opt#*=}
			;;
		--devel)
			DEVEL=1
			;;
		*)
			warn "unknown option: $opt"
			;;
	esac
done

if [ -z "$PREFIX_SET" ] && [ -z "$DEVEL" ]; then
	warn "No explicit --prefix set. You probably want --devel; see --help."
fi
if [ ! -z "$PREFIX_SET" ] && [ ! -z "$DEVEL" ]; then
	warn "specifying a --prefix with --devel doesn't make sense"
fi

$task