Library use: Turn off the Halo spinner

[amotl]

Problem

The Halo spinner is nice when using croud interactively, but it is detrimental when using it as a library. In this case, we faced problems within a Jupyter Notebook environment, because the notebook cell rendering gets offended by the rendering of the spinner.

Suggestion

Please only ever use interactivity components when is_tty() is True. In this spirit, absolutely don't start the HALO at module-scope level already, but initialize/configure it at runtime instead.

References

We had to turn off the Halo spinner currently used in croud, because it did not work well within a Jupyter Notebook environment.

• SDK and CLI for CrateDB Cloud Cluster APIs cratedb-toolkit#81 (comment)