A very minimalistic Bash clone of https://facebook.github.io/watchman/

simple-watchman.sh

#!/bin/bash

which inotifywait 2>/dev/null > /dev/null

if [[ $? != 0 ]]; then
  echo "can't listen for events, install inotify-tools first"
  exit 1
fi

directories=""

while [[ $# > 0 ]]; do
  if [[ $1 == "--" ]]; then
    shift
    break
  fi

  directories="$directories $1"
  shift
done

if [[ $directories == "" ]]; then
  echo "no directories provided"
  echo "usage: ./watchman.sh DIR1 DIR2 ... -- COMMAND ARG1 [injected: filename]"
  exit 1
fi

tput reset

inotifywait --monitor --event close_write --recursive $directories |
  while read path _ file; do
    tput reset
    filename="$path$file"

    echo "$filename triggered executing '$@'"
    echo ""

    $@ $filename
  done