Correct way of logging output from sub-processes

[ioquatix]

I'm currently trying to figure out a solution to jc00ke/guard-puma#24

By default, guard-puma spawns puma and it writes several lines of startup information, and then per-request log lines, to stdout.

The problem is this clobbers the guard shell.

What is the correct way to log lines of output when executing sub-processes via guard?

[ioquatix]

An example of the shell getting clobbered:

15:25:35 - INFO - Guard is now watching at '/tmp/test'
[1] guard(main)> Puma starting in single mode...
* Version 3.8.2 (ruby 2.4.0-p0), codename: Sassy Salamander

[ioquatix]

I checked the wiki under logging, but I couldn't see any obvious example of how sub-processes output should be handled. I'm sure this is simple, but perhaps we could also update the documentation.

[frederikspang]

This happens even without guard-puma, also just with rails and sidekiq. I have to open guard, and press enter for it all to run, before it shows up normally.