===== entr cheatsheet =====

  * -c – Clear screen
  * -d – Track directories that do not start with ''.'', new file causes ''entr'' to stop, so wrap it with ''while'' loop
  * -p – delay execution until files change event
  * -r – Kill previously run command before executing command
  * -s – Use shell on first argument
== trigger on changed files ==
<code>git status --porcelain | awk '{print $2}' | entr -c -r node app.js</code>

== reload nodejs app ==
<code>ls *.js | entr -c -r node app.js</code>

== Rebuild project if a source file is modified or added to the src/ directory ==

<code>
# bash
while true; do find ./src -iname '*.js' | entr -d node app.js; done

# fish
while true; find . -iname "*.py" | entr -rdc poetry run test; end
</code>


references:
  * https://hackaday.com/2019/01/31/linux-fu-easier-file-watching/