autogen

#!/bin/sh

# trace
trace() { echo "autogen: $*"; }
die()   { echo "autogen:ERROR: $*" >&2; exit 1; }

# usage
usage()
{
	cat <<EOF
USAGE: sh ./autogen [COMMAND]

COMMANDS:

  -b, --boot     bootstrap package (default command)
  -c, --clean    cleanup package
  -h, --help     print this message and exit
EOF
}

# proc_scan
proc_scan()
{
	trace "scanning configure.ac..."
	local out="`_proc_dump`"
	echo "$out"
	eval "$out"
}

# _proc_dump
_proc_dump()
{
	local regex='/^[ \t]*@@\(.*\)@@[ \t]*$/!d;
                 s,,\1,g;'
	_dump_conf <configure.ac \
		| m4 \
		| sed -e "$regex"
}

# _dump_conf
_dump_conf()
{
	cat <<EOF
changequote(\`[', \`]')
define(AC_INIT,
[@@PACKAGE='\$1'@@]
[@@VERSION='\$2'@@]
)
define(LT_INIT, [@@USE_LIBTOOL=1@@])
@@USE_LIBTOOL=0@@
EOF
	local line
	while read line; do
		if echo "$line" | grep -Eq '\\$'; then
			echo -n "$line" | sed -e 's,\\$, '
		else
			echo "$line"
		fi
	done
	# [TODO] assert line == ''
}

# proc_boot
proc_boot()
{
	proc_scan
	trace "bootstrapping package '$PACKAGE' $VERSION"
	# [fixme]
	echo '[TODO]' >ChangeLog
    if test -f autogen.pre-hook; then
        trace "pre-hook..."
        sh ./autogen.pre-hook || die "pre-hook failed"
    fi
	trace "aclocal..."
	aclocal || die "aclocal failed"
    test $USE_LIBTOOL -eq 0 || {
        trace "libtoolize...";
        libtoolize || die "libtoolize failed"; }
	trace "automake..."
	automake --gnu --add-missing || die "automake failed"
	trace "autoconf..."
	autoconf || die "autoconf failed"
	trace "all done!"
}

# main
main()
{
	# parse command line
	local cmd='boot'
	while test $# -gt 0; do
		case "$1" in
			-h|-help|--help) usage; exit 0;;
			*) echo "autogen:ERROR: invalid option: '$1'" >&2; exit 1;;
		esac
	done
	# go
	case "$cmd" in
		boot) proc_boot;;
		*) echo "autogen:ERROR: !? cmd='$cmd'" >&2; exit 1;;
	esac
}

# exec
main "${@}"