#!/usr/bin/env build

# FIXME find this dynamically
WIDTH="${WIDTH:-80}"

build_usage() { printf 'usage: build [options] <command> [command-opts] [all|<category>/<package|all> ...]\n\n'; }

build_commands()
{
	BUILDER_COMMANDS=
	BUILDER_CMD_WIDTH='0'

	build_usage
	echo "available builder commands from '${BUILDER_LIBDIR}':"
	for cmd in $(cd "${BUILDER_LIBDIR}" && echo build-*); do
		test -e "${BUILDER_LIBDIR}/${cmd}" || continue
		cmd="${cmd#build-}"
		BUILDER_COMMANDS="${BUILDER_COMMANDS} ${cmd#make-}"
		length="$(echo "${cmd#build-}"|wc -c)"

		if test "${length}" -gt "${BUILDER_CMD_WIDTH}"; then
			BUILDER_CMD_WIDTH="${length}"
		fi
	done

	BUILDER_COMMANDS="$(for cmd in ${BUILDER_COMMANDS}; do echo "${cmd}"; done|sort|uniq)"
	length='0'
	for cmd in ${BUILDER_COMMANDS}; do
		printf "  %-${BUILDER_CMD_WIDTH}s" "${cmd}"
		length="$((${length} + ${BUILDER_CMD_WIDTH} + 2))"
		if test "${length}" -gt "${WIDTH}"; then
			printf '\n'
			length='0'
		fi
	done
	printf '\n'

	# Find commands from ${PATH}
	BUILDER_COMMANDS=
	BUILDER_CMD_LENGTH='0'
	IFS=':'
	set -- ${PATH}
	for dir; do
		test -d "${dir}" || continue
		for cmd in $(cd "${dir}" && echo build-*); do
			test -e "${dir}/${cmd}" || continue
			BUILDER_COMMANDS="${BUILDER_COMMANDS} ${cmd#build-}"
			length="$(echo "${cmd#build-}"|wc -c)"

			if test "${length}" -gt "${BUILDER_CMD_WIDTH}"; then
				length="${BUILDER_CMD_WIDTH}"
			fi
		done
	done
	unset dir

	BUILDER_COMMANDS="$(for cmd in ${BUILDER_COMMANDS}; do echo "${cmd}"; done|sort|uniq)"
	test -z "${BUILDER_COMMANDS}" && return
	echo "available builder commands from '${BUILDER_LIBDIR}':"
	length='0'
	for cmd in ${BUILDER_COMMANDS}; do
		printf "  %-${BUILDER_CMD_WIDTH}s" "${cmd}"
		length="$((${length} + ${BUILDER_CMD_WIDTH} + 2))"
		if test "${length}" -gt "${WIDTH}"; then
			printf '\n'
			length='0'
		fi
	done
	printf '\n'
}

build_help()
{
build_usage
## usage
# Simply display the builder usage.  Though it would be nice if some of this
# information was pushed down into the sub-commands.
cat<<EOF
Options
-------
 -v, --version	Display the builder version.
 -d, --debug	Enable debug logging.
 -h, --help	Display the builder help and exit (may appear anywhere on the
		command line).

Commands
--------
  query		The query is used internally by builder, while allowing
		one to query various packages from the builder repository.

  source	Create a copy/checkout of the package sources inside of
		packages/<category>/<name>/source.  The source/ directory
		within a package takes precendences over the SOURCE_URI,
		allowing in-place development of various packages.  This is
		particularly useful if the SOURCE_URI is an SCM.

  fetch		Fetch the sources for a package from the SOURCE_URI and store
		them into the sources/ top-level directory.  This is done
		automatically for all commands which depend on it.

  prep		Prepare a package for compilation.  This command is performed
		automatically for all commands which depend on it.

  compile	Compile a package.  This command is performed automatically for
		all commands which depend on it.

  package	Construct a binary "artifact" file from a compiled package.
		This command is performed automatically for all commands which
		depend on it.

  install	Install a binary artifact into the sysroot. This action is
		performed automatically for any packages which the current
		target depends on.  If necessary produce binary artifacts for
		all package deps.

  clean		Clean specified package from sysroot and artifacts.

  distclean	Clean up specified package from sysroot, artifacts, and sources.

  export	Export the binary package to an rpm.

  help		Display this help. Try 'help --all' to list all commands'.
EOF
}

if test "${BUILDER_CALL_STACK}" = '__main__'; then
	while test "$#" -gt '0'; do
		case "${1}" in
		(--all)	build_commands; exit 0;;
		(--)	shift; break;;
		(-*)	die "unknown option '${1}'";;
		(*)	if test -x "${BUILDER_LIBDIR}/build-make-${1}"; then
				exec build "make-${1}" --help
			fi
			exec build "${1}" --help;;
		esac
	done

	build_help
fi

# vim: filetype=sh