So I have the following situation:
There is an HTML file in some directory on my PC. If I open this HTML file in a browser, I want to click a button with which I can write or change a file in the same directory.
So there is no server whatsoever, just an HTML file opened in a browser.
Is this possible?
Calling a python script from a button would also work for me.
I just have to be able to detect a change in the directory when the button is clicked.
Yes it is. but there is additional system like git. and you need to implement using javascript.
I am sorry about I can not provide exact solution about your question. but I can give you keywords. I assume you do not know about git.
I recommend implement local git system for your local directory. because there is lot of changes your files. (like edit single character or add new files) and some of files you do not want detected (that's mentioned in .gitignore)
and there is suitable project for you isomorphic-git
. and If you heard about git first, also check github guide.