inotifywait for cargo

cycle.sh

#!/usr/bin/env bash

# Clear the screen, run the initial command in the background immediately,
# and then get the PID. We need that to kill it later (if the program is a
# server/daemon or the like).
${*} &
pid=$!

# Now run inotifywait and only act on certain events, recursively.
# Kill the previous PID (if applicable). Will output an error if the
# PID cannot be found but that can be ignored.
inotifywait -m -q -e CLOSE_WRITE,DELETE,MOVED_FROM -r . |
	while read path action file; do
		if [[ "${file}" =~ .rs$ ]]; then
			printf "\e[33;1m================================================\n"
			printf "\e[32;1mRunning \e[0m'${*}'\n"
			printf "\e[32;1mKilling \e[0mprevious PID ${pid}...\n"
			printf "\e[33;1m================================================\n"
			${*} &
			pid=$!
		fi
	done