luthier

#!/bin/bash
#
# Automate the fetching and building of something, and manage
# the builds.
#

set -eu

VERBOSE=false

verbose()
{
	if $VERBOSE; then
		echo "$@" >&2
	fi
}

error()
{
	echo "$@" >&2
}

fatal()
{
	local CODE="$1"; shift

	error "$@"
	exit "$CODE"
}

fatal_usage()
{
	fatal 64 "$@"
}

fatal_option()
{
	fatal_usage "$1: unknown option"
}

#
# Function to perform one of the user-defined commands in context
#

callout()
{
	"$LIBEXEC/user" "$SCRIPT" "$SCRATCH" "$@"
}

#
# Start with recommended defaults, parse the rest
#

BUILDS=.

while true; do
	case "${1-}" in
	--verbose)
		shift
		VERBOSE=true
		;;

	--builds)
		shift
		BUILDS="$1"; shift
		;;
	*)
		break
	esac
done

if [ -z "${1-}" ]; then
	ACTION=list
else
	ACTION="$1"; shift
fi

#
# Work out where our related files are
#

BIN=$(dirname $(which $0))
LIBEXEC="$BIN/../libexec/luthier"

if ! [ -d "$LIBEXEC" ]; then
	LIBEXEC=.
fi

verbose "Supplementary commands installed in $LIBEXEC"

STATE="$BUILDS/.luthier"
SCRIPT="$BUILDS/luthier.sh"

case "$ACTION" in
build)
	source "$LIBEXEC/build"
	;;

freshen)
	source "$LIBEXEC/freshen"
	;;

purge)
	source "$LIBEXEC/purge"
	;;

ls|list)
	source "$LIBEXEC/list"
	;;

*)
	fatal_option "$ACTION"
esac