aggregated-cli-reporter

A way of reporting results of multiple processes without overflowing the terminal.

It will rewrite the previous lines, so there never are more visible than the latest message.

Note: If something else is writing to stdout, it will interfere with this module, since this module can only delete the x last lines, which no longer matches the actual lines written to stdout.

Usage

The interface:

class AggregatedCLIReporter {
    constructor({ showTime = true, showName = false })
    set(name, messages, { showTime = true, showName = false })
}

Creating a new reporter

import AggregatedCLIReporter from 'aggregated-cli-reporter'
// Or
const AggregatedCLIReporter = require('aggregated-cli-reporter')

const reporter = new AggregatedCLIReporter()

The constructor can take some configuration options:

• showTime: Shows a timestamp that the message was received. Defaults to true.
• showName: Shows the name passed to #set(). Defaults to false.

const reporter = new AggregatedCLIReporter({
    showTime: false,
    showName: true,
})

Writing logs

The reporter.set() method sets the latest output for a specific name.

reporter.set('tool1', 'Some message')

/* output:
12:45:12: Some message
*/

There can only ever be one message per name, but there is no limit to the number of names.

reporter.set('tool2', 'Some other message')

/* output:
12:45:12: Some message
12:47:22: Some other message
*/

// skip 12 seconds

reporter.set('tool2', 'Something new happened')

/* output:
12:45:12: Some message
12:47:34: Something new happened
*/

The names are printed in the order that they were last modified, so the latest message is always in the bottom.

reporter.set('tool1', 'Something happened to the first tool')

/* output:
12:47:34: Something new happened
12:49:01: Something happened to the first tool
*/

Any characters can be added, including colors and newlines.

reporter.set('tool1', 'Tool 1 is split\non lines')
/* output:
12:47:34: Something new happened
13:01:43: Tool 1 is split
on lines
*/

The message can also be an array, in which case the tool will print each value on a separate line, all prefixed.

reporter.set('tool1', [ 'Something happened', 'that should', 'be split\non lines' ])

/* output:
12:47:34: Something new happened
13:02:23: Something happened
13:02:23: that should
13:02:23: be split
on lines
*/

Overriding options per message

The #set() call takes the same arguments as the constructor. The options will override the default for that specific message only.

const reporter = new AggregatedCLIReporter({ showTime: true, showName: true })

reporter.set('tool1', 'abc')
/* output:
12:34:56: tool1: abc
*/

reporter.set('tool1', 'abc', { showName: false })
/* output:
12:34:56: abc
*/

reporter.set('tool2', 'def', { showTime: false })
/* output:
12:34:56: abc
tool2: def
*/

reporter.set('tool3', [ 'ghi', 'jkl' ])
/* output:
12:34:56: abc
tool2: def
12:34:56: tool3: ghi
12:34:56: tool3: jkl
*/