Verbose logging for TUI

[orhun]

Is your feature request related to a problem? Please describe.
Printing to stdout is not possible while running TUI since the output is locked by the terminal backend (termion). This causes verbose logging to be suppressed.

Describe the solution you'd like
Add a new command-line flag named --verbose and somehow enable verbose logging while running the TUI.

Describe alternatives you've considered
-

Additional context
This will be useful when some of the parameters cannot be retrieved due to insufficient permissions and error logs are printed. Right now there is no way of telling when the parameter list is fetched without errors when the TUI is launched.

[koutheir]

Logging to the terminal when a TUI is rendered might cause rendering issues. Have you considered the following alternatives:

• Logging to a log file.
• Logging to the syslog.
• Tearing down the TUI right before printing to stderr.

[orhun]

Thank you for the ideas @koutheir!

Another alternative would be using tui-logger.

[koutheir]

Logging inside TUI would make the logs unavailable for further analysis at a later date, which is a very common use case for logs.

[orhun]

What do you suggest here? @koutheir

[koutheir]

I suggest saving the log entries to a log file that can be analyzed after the fact.

[orhun]

tui-logger supports saving the logs to a file and also provides a smart widget for analyzing them. I implemented a draft at #83