Intercepting the 'time' section of the log message?

Hi,

Great tool. I especially love the fact that we can intercept and modify the concat and render stages.

One thing I was not able to do:

I would like to format the timestamp in the following fashion:

[2019-01-19T15:40:28.535Z] (INFO) This is just a message reporting a variable:
                        	  [1, 2, 3, 4, 5, 6] (info @ logging.js:60)

I know we can add a custom printer for the time, but that changes the output to:

[Sat Jan 19 2019 15:17:03 GMT+0000 (Greenwich Mean Time)]

which is not something that I would like to do? So here is what I am trying to achieve:

• Add [ to the start and ] to the end of the timestamp.
• Change the color of the timestamp (I know I can do that through the custom printer, but the custom printer is changing the look of the date)
• Adding a (INFO) signature between the timestamp and the message block, so the second line of the message does not spill below the (INFO) signature.

So it looks a bit like this:

Obviously, I tried this:

const logging = log.configure ({
    /*  Injects a function after the "concat" step            */
    'concat+' (blocks) {
        console.log(blocks)
        return blocks;
    },
    time: {
        yes: true,
        format: 'iso'
    }
});

as an attempt to intercept the text stream and try re-format it, but I got this:

[ '\u001b[33m\u001b[22m\u001b[1mThis is just a message reporting a variable:\u001b[22m\u001b[39m',
  '\u001b[33m\u001b[22m\u001b[1m\u001b[22m\u001b[39m [1, 2, 3, 4, 5, 6]' ]

… so the timestamp was not there 😃

[xpl]

@cryptoeraser I’ve added a new overrideable stage called tag. Please see the updated docs:

1. Displaying The INFO/WARN/ERROR Tags
2. Customized Tag Printer

The example code:

const bullet = require ('string.bullet') // NB: these packages are part of Ololog, no need to install them separately
const { cyan, yellow, red, dim } = require ('ansicolor')

const log = require ('ololog').configure ({

    locate: false,
    time: true,
    tag: (lines, {
            level = '',
            levelColor = { 'info': cyan, 'warn': yellow, 'error': red.bright.inverse },
            clusterId
          }) => {
        
        const clusterStr = clusterId ? ('CLUSTER[' + (clusterId + '').padStart (2, '0') + ']') : ''
        const levelStr = level && (levelColor[level] || (s => s)) (level.toUpperCase ())

        return bullet (dim (clusterStr.padStart (10)) + '\t' + levelStr.padStart (6) + '\t', lines)
    }
})

log.configure ({ tag: { clusterId: 1  } })       ('foo')
log.configure ({ tag: { clusterId: 3  } }).info  ('bar')
log.configure ({ tag: { clusterId: 27 } }).error ('a multiline\nerror\nmessage')

[cryptoeraser]

Yeah, I have seen your commit and I was already digging in the diffs 😃 Thank you very much! This is amazing!