inotifydo

#!/usr/bin/env bash

# inotifydo <path> <command>
# Run a command when a file in the path changes.
#
# Examples:
#
# Run my python tests when I change a file in the current path
# inotifydo . "python manage.py test"
#
# Copy my css file from one dir to the other when it changes
# inotifydo public/styles.css "cp public/styles.css build/styles.css"

red=`tput setaf 1`
green=`tput setaf 2`
yellow=`tput setaf 3`
reset=`tput sgr0`

debounce=${DEBOUNCE:-1}
currpid=
hasgit=$(git rev-parse 2> /dev/null ; echo $?)

run() {
  echo "Run command ${green}${1}${reset}"
  $1
  echo
  echo "${green}Waiting for changes...${reset}"
}

debounce_and_run() {
  kill ${currpid} &> /dev/null
  sleep ${debounce}
  run "$1"
}

run "$2"

while true
do
  path=$(inotifywait -q --exclude .git -e CREATE,MODIFY,DELETE --format %w%f -r $1)
  if [ ${hasgit} -eq 0 ]
  then
    ignore=$(git check-ignore -q ${path} ; echo $?)
    if [ ${ignore} -eq 0 ]
    then
      echo "${yellow}Ignore file ${path}${reset}"
    else
      echo "${green}Change in file ${path}${reset}"
      debounce_and_run "$2" &
      currpid=$!
    fi
  else
    echo "${green}Change in file ${path}${reset}"
    debounce_and_run "$2" &
    currpid=$!
  fi
done