Using rsync, inotify, and fswatch to sync code between 2 environments

code-sync.sh

### How it works
## rsync
# A tool that syncs your files across environments over ssh.
# When you run the command the second time, it only copies the changed files.

## inotify/fswatch
# inotify-tools is a linux file watcher and fswatch is for Mac OS. It's as simple as that.

## Put them together and you get
# A tool that watches your files for changes on one machine and updates them on the other immediately.

### How to use it
# 1. Set the env variables REMOTE_DIR (format: user@host:dir) and LOCAL_DIR (ex. /home/user/my_project)
# 2. Run the script

#!/usr/bin/env bash
set -e
trap "exit" INT
CYAN='\033[0;36m'
NC='\033[0m'

# Exclude .git directory and vim tmp files
EXCLUDE='.git|\.sw.*|.\~|4913'

# Make sure the local and remote dirs locations env vars are set
if [ -z ${REMOTE_DIR} ]; then
  echo "please set the environment variable REMOTE_DIR (ex. /home/user/prj_dir)"
  exit 1
fi
if [ -z ${LOCAL_DIR} ]; then
  echo "please set the environment variable LOCAL_DIR (format: user@host:dir)"
  exit 1
fi

# set whether to use inotifywait or fswatch depedning on which one exists
# If neither exist, exit with status 1
hash inotifywait 2>/dev/null && use_inotify=true || \
  hash fswatch 2>/dev/null && use_fswatch=true || \
  exit 1

if [ "${use_inotify}" = true ]; then
  # watch recursilvely for file changes and deletions
  # output format: HH:MM:SS - Event:Event filename
  watch="inotifywait -r -m -e close_write -e delete --exclude \"${EXCLUDE}\" --format '%T - %:e %f' --timefmt '%H:%M:%S' \"${LOCAL_DIR}\""
elif [ ${use_fswatch} = true ]; then
  # watch recursively for the listed events
  # output format: HH:MM:SS absolute/path/to/file Event Event
  watch="fswatch -txr -f '%H:%M:%S' \
    -e $(echo \"${EXCLUDE}\" | sed 's/\|/\ -e\ /g') \
    --event Created --event Updated --event Removed --event Renamed --event MovedFrom --event MovedTo \
    \"${LOCAL_DIR}\""
fi

# print the output the watch command and sync push
eval "${watch}" | while read notification; do
  echo -e "${CYAN}${notification}${NC}"
  # sync the changes and deletions in the local dir with the remote dir
  # and exclude the gitignored files and .git dir
  rsync -aiz --delete --exclude-from "${LOCAL_DIR}/.gitignore" --exclude ".git" ${LOCAL_DIR} ${REMOTE_DIR}
done