#!/bin/bash
source()
{
	if	[[ $1 != */* ]] &&
	    	(
			command -v base64_embedded_source__"$1" ||
			[ -f src/"$1" ]
		) >&2 # >/dev/null
	then
		rewrite_self \
			"$1" \
			src/"$1" \
			base64_embedded_source__"$1" \
			"${@:2}"
	else
		builtin source "$@"
	fi
}

denominate_function()
{
	declare -n func_name="$1"
	local func_output_b64encoded output_hash
	read -r -d '' \
		func_output_b64encoded \
		< <(base64) || [ "${func_output_b64encoded}" ]
	read output_hash _ \
		< <(base64 -d <<< "$func_output_b64encoded" | sha256sum)
	[ ${#output_hash} = 64 ] || return
	func_name=SHA256_${output_hash:0:32}
	source <(cat <<END
${func_name} ()
{
base64 -d <<.
${func_output_b64encoded}
.
}
END
)
}

rewrite_self()
{
	declare -n do_rewrite=do_rewrite${RANDOM}
	do_rewrite=

	if	[ -f "$2" ]
	then
		if	[ -w "$0" ]
		then
			do_rewrite=$(mktemp) || return
			source <(stdin_to_function "$3" < "$2" |
				tee "$do_rewrite") || return
		else
			source <(stdin_to_function "$3" < "$2") || return
		fi
	fi
	command -v "$3" >/dev/null || return

	builtin source <("$3") "${@:4}" || return

	[ "$do_rewrite" ] || return 0

	if	sed \
		-i~"$(date -Ins)" \
		-e "1 { r ${do_rewrite}"$'\n'" }" \
		"$0"
	then
		local r=0
	else
		local r=$?
	fi
	rm "$do_rewrite"
	return $r
}

stdin_to_function()
{
	cat <<.
${1}()
{
	base64 -d <<.
$(base64 && echo .)
}
.
}

embed_source()
{
	stdin_to_function "base64_embedded_source__${1}" "${@:2}"
}

print_test_script_for_SOURCES.bash()
{
	cat <<.
#!/bin/bash
source SOURCES.bash
source rpc.bash
r()
{
	: base64_embedded_source__rpc.bash
	: base64_embedded_source__dependencies.bash
	source rpc.bash
}
BASH_RPC_REMOTE_DEST=localhost \\
	remote_run_function \\
		r
.
}

setup_test_dir()
{
	(
		set -e
		mkdir -p test_SOURCES.bash
		cd test_SOURCES.bash
		mkdir -p src
		ln -sf -t src \
			../../SOURCES.bash \
			../../src/{rpc,dependencies}.bash
		print_test_script_for_SOURCES.bash > test-SOURCES.bash
	)
}

run_test()
{
	(
		set -ex
		cd test_SOURCES.bash
		PATH=$PWD/src:$PATH bash test-SOURCES.bash || true
		PATH=$PWD/src:$PATH bash test-SOURCES.bash
	)
}

bootstrap_SOURCES.bash()
{
	setup_test_dir && run_test
}

[ "$0" = 'bootstrap_SOURCES.bash' ] && bootstrap_SOURCES.bash