configure

#!/bin/sh -e
SOVERSION=0.0.0

pkg_config=${PKG_CONFIG:-pkg-config}
outdir=${OUTDIR:-.build}
srcdir=${SRCDIR:-$(dirname "$0")}
CC=${CC:-cc}
LIBS=

use_readline=-1
readline=readline

static=

for arg
do
	case "$arg" in
		--prefix=*)
			PREFIX=${arg#*=}
			;;
		--without-readline)
			use_readline=0
			;;
		--with-readline=*)
			use_readline=1
			readline=${arg#*=}
			;;
		--static)
			static=$arg
			;;
		--dynamic)
			static=
			;;
	esac
done

libmrsh() {
	genrules libmrsh \
		'arithm.c' \
		'array.c' \
		'ast_print.c' \
		'ast.c' \
		'buffer.c' \
		'builtin/alias.c' \
		'builtin/bg.c' \
		'builtin/break.c' \
		'builtin/builtin.c' \
		'builtin/cd.c' \
		'builtin/colon.c' \
		'builtin/command.c' \
		'builtin/dot.c' \
		'builtin/eval.c' \
		'builtin/exec.c' \
		'builtin/exit.c' \
		'builtin/export.c' \
		'builtin/false.c' \
		'builtin/fg.c' \
		'builtin/getopts.c' \
		'builtin/hash.c' \
		'builtin/jobs.c' \
		'builtin/pwd.c' \
		'builtin/read.c' \
		'builtin/return.c' \
		'builtin/set.c' \
		'builtin/shift.c' \
		'builtin/times.c' \
		'builtin/trap.c' \
		'builtin/true.c' \
		'builtin/type.c' \
		'builtin/ulimit.c' \
		'builtin/umask.c' \
		'builtin/unalias.c' \
		'builtin/unset.c' \
		'builtin/unspecified.c' \
		'builtin/wait.c' \
		'getopt.c' \
		'hashtable.c' \
		'parser/arithm.c' \
		'parser/parser.c' \
		'parser/program.c' \
		'parser/word.c' \
		'shell/arithm.c' \
		'shell/entry.c' \
		'shell/job.c' \
		'shell/path.c' \
		'shell/process.c' \
		'shell/redir.c' \
		'shell/shell.c' \
		'shell/task/pipeline.c' \
		'shell/task/simple_command.c' \
		'shell/task/task.c' \
		'shell/task/word.c' \
		'shell/trap.c' \
		'shell/word.c'
}

mrsh() {
	if [ $use_readline -eq 1 ]
	then
		genrules mrsh \
			'main.c' \
			'frontend/readline.c'
	else
		genrules mrsh \
			'main.c' \
			'frontend/basic.c'
	fi
}

highlight() {
	genrules highlight example/highlight.c
}

genrules() {
	target="$1"
	shift
	printf '# Begin generated rules for %s\n' "$target"
	for file in "$@"
	do
		file="${file%.*}"
		printf '%s.o: %s.c\n' "$file" "$file"
	done
	printf '%s_objects=\\\n' "$target"
	n=0
	for file in "$@"
	do
		file="${file%.*}"
		n=$((n+1))
		if [ $n -eq $# ]
		then
			printf '\t%s.o\n' "$file"
		else
			printf '\t%s.o \\\n' "$file"
		fi
	done
	printf '# End generated rules for %s\n' "$target"
}

append_cflags() {
	for flag
	do
		CFLAGS="$(printf '%s \\\n\t%s' "$CFLAGS" "$flag")"
	done
}

append_ldflags() {
	for flag
	do
		LDFLAGS="$(printf '%s \\\n\t%s' "$LDFLAGS" "$flag")"
	done
}

append_libs() {
	for flag
	do
		LIBS="$(printf '%s \\\n\t%s' "$LIBS" "$flag")"
	done
}

test_cflags() {
	[ ! -e "$outdir"/check.c ] && cat <<-EOF > "$outdir"/check.c
	int main(void) { return 0; }
	EOF
	werror=""
	case "$CFLAGS" in
		*-Werror*)
			werror="-Werror"
			;;
	esac
	if $CC $werror "$@" -o /dev/null "$outdir"/check.c >/dev/null 2>&1
	then
		append_cflags "$@"
	else
		return 1
	fi
}

test_ldflags() {
	[ ! -e "$outdir"/check.c ] && cat <<-EOF > "$outdir"/check.c
	int main(void) { return 0; }
	EOF
	if $CC "$@" -o /dev/null "$outdir"/check.c >/dev/null 2>&1
	then
		append_ldflags "$@"
	else
		return 1
	fi
}

mkdir -p "$outdir"

if [ -n "$static" ]
then
	test_ldflags $static
fi

for flag in \
	-g -std=c99 -pedantic -Werror -Wundef -Wlogical-op \
	-Wmissing-include-dirs -Wold-style-definition -Wpointer-arith -Winit-self \
	-Wfloat-equal -Wstrict-prototypes -Wredundant-decls \
	-Wimplicit-fallthrough=2 -Wendif-labels -Wstrict-aliasing=2 -Woverflow \
	-Wformat=2 -Wno-missing-braces -Wno-missing-field-initializers \
	-Wno-unused-parameter -Wno-unused-result
do
	printf "Checking for $flag... "
	if test_cflags "$flag"
	then
		echo yes
	else
		echo no
	fi
done

for flag in -fPIC -Wl,--no-undefined -Wl,--as-needed
do
	test_ldflags "$flag"
done

soname=libmrsh.so.$(echo "$SOVERSION" | cut -d. -f1)
printf "Checking for specifying soname for shared lib... "
if ! \
	test_ldflags -Wl,-soname,$soname || \
	test_ldflags -Wl,-install_name,$soname
then
	echo no
	echo "Unable to specify soname (is $(uname) supported?)" >&2
	exit 1
else
	echo yes
fi

printf "Checking for exported symbol restrictions... "
if ! \
	test_ldflags -Wl,--version-script="libmrsh.gnu.sym" || \
	test_ldflags -Wl,-exported_symbols_list,"libmrsh.darwin.sym"
then
	echo no
	echo "Unable to specify exported symbols (is $(uname) supported?)" >&2
	exit 1
else
	echo yes
fi

if [ $use_readline -eq -1 ]
then
	printf "Checking for readline... "
	if $pkg_config readline
	then
		readline=readline
		use_readline=1
		append_cflags -DHAVE_READLINE
		# TODO: check for rl_replace_line
		append_cflags -DHAVE_READLINE_REPLACE_LINE
		echo yes
	else
		echo no
	fi
fi
if [ $use_readline -eq -1 ]
then
	printf "Checking for libedit... "
	if $pkg_config libedit
	then
		echo yes
		readline=libedit
		use_readline=1
		append_cflags -DHAVE_EDITLINE
	else
		echo no
	fi
fi

if [ $use_readline -eq 1 ]
then
	append_cflags $($pkg_config $static --cflags-only-I $readline)
	append_libs $($pkg_config $static --libs $readline)
fi

printf "Creating %s/config.mk... " "$outdir"
cat <<EOF > "$outdir"/config.mk
SOVERSION=$SOVERSION
CC=$CC
PREFIX=${PREFIX:-/usr/local}
_INSTDIR=\$(DESTDIR)\$(PREFIX)
BINDIR?=${BINDIR:-\$(_INSTDIR)/bin}
LIBDIR?=${LIBDIR:-\$(_INSTDIR)/lib}
INCDIR?=${INCDIR:-\$(_INSTDIR)/include}
MANDIR?=${MANDIR:-\$(_INSTDIR)/share/man}
PCDIR?=${PCDIR:-\$(_INSTDIR)/lib/pkgconfig}
CFLAGS=${CFLAGS}
LDFLAGS=${LDFLAGS}
LIBS=${LIBS}
SRCDIR=${srcdir}

all: mrsh highlight libmrsh.so.\$(SOVERSION) \$(OUTDIR)/mrsh.pc
EOF
libmrsh >>"$outdir"/config.mk
mrsh >>"$outdir"/config.mk
highlight >>"$outdir"/config.mk
echo done

touch "$outdir"/cppcache