data/custom_js.html is not loaded

[TheRealVira]

Problem/Motivation

Whether this is a feature request or a bug I am unsure of. Following the original documentation of Grocy for adding custom js without having to modify the application itself does not work as is.

Expected behavior

Based on their documentation:

https://github.com/grocy/grocy#adding-your-own-css-or-js-without-to-have-to-modify-the-application-itself

When the file data/custom_js.html exists, the contents of the file will be added just before </body> (end of body) on every page.

Actual behavior

When creating a dedicated folder+file the custom content is not loaded before </body> on every page. Neither is there any visual error or log entry about it.

Steps to reproduce

1. Create a data folder under config/custom_components/grocy.
2. Create a custom_js.html file under the new data directory containing whatever script you want to add.
3. Restart Grocy

Proposed changes

1. On boot; Force copy everything from the custom data folder into the correct location.

I assume that the "real" data directory for Grocy is somewhere different than the addon-grocy component. Force copying everything from the custom component "addon-grocy" to the "real Grocy" on boot will probably be enough. Optionally a hash comparison check between each file could be implemented to see if there is a new version to use. That way you could reduce actions to files which are different between the data folders.

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