install_library : "depends" property

[tobozo]

Hello and thanks again for this awesome script 👍

I've recently moved a source subtree from github submodule to a declaration in the library.json and library.properties file, and the Arduino IDE seems to prompt for installation of the dependency as expected.

While adding an extra line to my travis.yml isn't an issue at all, I was wondering if having check_library_properties to read the "depends" values in the library.properties file would make sense ?

[per1234]

You're welcome, and I'm glad if you have found it useful.

This is indeed something I have considered after seeing Adafruit do it in their CI script:
https://github.com/adafruit/ci-arduino/blob/44550ac828c25a8b4cd9744111f063ada3d35368/build_platform.py#L156-L170

I've been working lately on reproducing the functionality of this script in Arduino's official GitHub Actions actions:
https://github.com/arduino/actions/tree/master/libraries
So, for now, I'm holding off on doing work to add additional features to this script until I see whether it will eventually be possible to deprecate it in favor of the official CI tools.

I have already proposed that this feature be added to Arduino's compile-examples action.

It's not a perfect solution to installing dependencies for CI because I have found that many library authors will only add the dependencies of the library itself, but not additional dependencies the library's example sketches might have. However, the additional dependencies can always be installed via install_library as usual.