Debugging lib/system/06_system.sh

[ghost]

Hi niieani,

I forked your bash-oo-framework to extend the System.Import function for loading modules directly from github repos. Thus I'd like to print out the subject=level{2,3,4} .... lines Unfortunately I don' really understand how to set-up the logger.

I tried this:

#!/usr/bin/env bash

## BOOTSTRAP ##
source "$( cd "${BASH_SOURCE[0]%/*}" && pwd )/lib/oo-framework.sh"

level_debug(){
  echo "level: $*"
}

Log.RegisterLogger level4 level_debug
Log.RegisterLogger level3 level_debug
Log.RegisterLogger level2 level_debug

## MAIN ##

import lib/steffenhoenig/crash/modules/example
import lib/type-core

[niieani]

Hey @steffenhoenig. That's a really cool idea! I was thinking of implementing something similar, but never got enough time for it. Anyway, to the logger. Function Log.RegisterLogger takes two parameters: First is the name of the logger - how you want to call it. Second is the name of the function that is used for logging.

After you register the logger in the system, you need to set what you want logged. The simplest way to do that is to log everything in a namespace. Just put namespace Hello in the file you want to log from and then: Log.AddOutput Hello $logger_name

Take a look here for the example usage: logging.sh.

In any case, if all you need is to use subject=$log_level, you can use the default loggers, which are already registered. Default logger CUSTOM prints the $subject by default.

#!/usr/bin/env bash

## BOOTSTRAP ##
source "$( cd "${BASH_SOURCE[0]%/*}" && pwd )/lib/oo-framework.sh"

namespace MyApp
Log.AddOutput MyApp CUSTOM

subject=WARN Log "I am a warning"
subject=STEFFEN Log "I am a Steffen :-)"

The above should work and print out:

[WARN] [steffen.sh:9] I am a warning 
[STEFFEN] [steffen.sh:10] I am a Steffen :-) 

If you don't want the file and line in the logs, we can write a simple Logger Function:

# (...) bootstrap (...) #

namespace MyApp

SteffensLoggingFunction() {
    Console.WriteStdErr "$(UI.Color.Blue)[$subject]$(UI.Color.Default) $*"
}

Log.RegisterLogger STEFFEN_SHORT_LOGGER SteffensLoggingFunction
Log.AddOutput MyApp STEFFEN_SHORT_LOGGER

subject=WARN Log "I am a warning"
subject=STEFFEN Log "I am a Steffen :-)"

Prints:

[WARN] I am a warning 
[STEFFEN] I am a Steffen :-) 

Be sure to checkout both doc. sections on logging:

• https://github.com/niieani/bash-oo-framework#using-basic-logging-colors-and-powerline-emoji
• https://github.com/niieani/bash-oo-framework#advanced-logging

If you have more questions, shoot.

[niieani]

Also, regarding what you're trying to do - I think it would be better if you wrote a new module, say System.HttpImport for that purpose. We could integrate it at a later point, but for now - for debugging purposes - it will be much easier for you to develop that way.

[niieani]

@steffenhoenig did that help? Can I close the issue?

[ghost]

Hi @niieani ,

yeah that helped to get my head around it. Just working with a line like

namespace oo
Log.AddOutput oo CUSTOM

And, et voila I got all the debug output I had been after. Thx mate.

P.S. Your hint to make it upstream compatible inspired me to refactor it to another file. Will upload it asap. Cheers!