Performs a command when the content of a directory changed.

imake.zsh

#!/bin/zsh

autoload colors; colors

if [ $# != 2 ]; then
  echo "usage: $0 <root-dir> <command>"
  exit 1
fi

ROOTDIR=$1
COMMAND=$2
INTERVAL=3

function separator() {
  echo -n "$fg[blue]"
  for i in $(seq 1 $COLUMNS); do
    echo -n '─'
  done
  echo "$reset_color"
}

function message() {
  echo "$bg_bold[blue] imake $reset_color $1"
}

function list_all_files() {
  find $(realpath $1) \
    -type d -path $(realpath .) -prune \
    -or -name '.*' -prune \
    -or -type f -print \
  | sort
}

function get_hash() {
  files=$(list_all_files $1)
  # Encodes both list of file names and their contents.
  (echo ${files}; echo ${files} | xargs cat) | openssl sha256
}

old_hash=$(get_hash ${ROOTDIR})
separator
message "waiting for changes."

while true; do
  sleep ${INTERVAL}
  new_hash=$(get_hash ${ROOTDIR})

  if [ "${new_hash}" != "${old_hash}" ]; then
    message "change detected."
    eval ${COMMAND}

    if [ $? = 0 ]; then
      message "$fg[green]make succeeded.$reset_color"
    else
      message "$fg[red]make failed.$reset_color"
    fi

    old_hash=${new_hash}
    separator
    message "waiting for changes."
  fi
done

imake_inotifywait.zsh

#!/bin/zsh

autoload colors; colors

if [ $# != 2 ]; then
  echo "usage: $0 <root-dir> <command>"
  exit 1
fi

ROOTDIR=$1
COMMAND=$2
INTERVAL=3

function separator() {
  echo -n "$fg[blue]"
  for i in $(seq 1 $COLUMNS); do
    echo -n '─'
  done
  echo "$reset_color"
}

function message() {
  echo "$bg_bold[blue] imake $reset_color $1"
}

while true; do
  separator
  message "waiting for changes."

  inotifywait -r ${ROOTDIR} \
    -e CLOSE_WRITE -e MOVED_TO -e MOVED_FROM \
    -e CREATE -e DELETE \
    >/dev/null 2>/dev/null

  eval ${COMMAND}

  if [ $? = 0 ]; then
    message "$fg[green]make succeeded.$reset_color"
  else
    message "$fg[red]make failed.$reset_color"
  fi
done