terminal-status-board

1.4.0 • Public • Published

terminal-status-board

display the progress of multiple concurrent job sequences in your terminal, kind of like the departure boards at airport terminals.

Installation

npm install terminal-status-board

Basic Usage

var board = require('terminal-status-board');
 
board()
    .add([asyncFunc1, asyncFunc2])
    .add([asyncFunc3, asyncFunc4])
    .on('end', function() {console.log('ALL DONE');})
    .pipe(process.stdout);

asyncFunc1 and asyncFunc2 run in sequence, so do asyncFunc3 and asyncFunc4. These two sequences however, run in parallel. (think of airplanes changing status from 'boarding' to 'borading complete' to 'departure').

Advanced Usage

var board = require('terminal-status-board');
var pipeline = require('progress-pipeline');
 
function makeJob(name, duration, err) {
    var f = function(cb) {
        setTimeout(function() {cb(Math.random()>0.8?err:null);}, duration);
    };
    f.title = name;
    return f;
}
 
function makeJobs(jobCount, fail) {
    var jobs = [];
    for(var i=0; i<jobCount; ++i) {
        var duration = Math.floor(Math.random() * 4000);
        var name = String.fromCharCode(65+i);
        jobs.push(makeJob(name, duration, fail?new Error('this is bad!'):null));
    }
    return jobs;
}
 
board()
    .add(makeJobs(8), 'first')
    .add(makeJobs(8), {
        template: function(ctx) {
            if (ctx._jobFinished && ctx._jobIndex === ctx._totalJobs-1) {
                return '  2nd: done';
            }
            return '-\\|/'[ctx._jobIndex % 4] + ' 2nd';
        }
    })
    .add(
        pipeline(makeJobs(20, true)).on('error', function() {
            process.stdout.write('\u0007'); // terminal BELL
        })
    )
    .add(makeJobs(10, true), {context: {name: 'fourth', color:'yellow'}})
    .on('end', function() {console.log('ALL DONE');})
    .pipe(process.stdout);

This is the output of the above code:

demo output

API

board([options])

The returned object is a Stream that emits ANSI escape sequences to update the screen. Pipe it to stdout to make it visible in the terminal. The stream instance originates from substack/node-charm.

Options are

  • template: a custom template function that renders a line of the board

    function(ctx) -> String

    Where ctx has these properties:

    • _index: zero-based index of the line to render
    • _totalJobs: number of jobs in the sequence
    • _jobIndex: zero-based index of current job
    • _job: the current job
    • _jobResult: result of the current job (when job has finished)
    • _jobFinished: true, when job has just finished, false when it started
    • _error: error object returned by current job (when job has failed)
    • whatever additional properties you passed as context to add() (see below)

if template is not specified, a default template is used.

add( jobs[] or pipeline, [options or string] )

Adds a line to the board, displaying the current state of a sequence of async jobs. Jobs can either be defined as an array of async functions, or as an instance of regular/progress-pipeline.

Options are:

  • template: a custom template function for this sequence (see above)
  • context: additional properties that will be available to the template function. the default template cares about these additional properties:
    • name: the name of the sequence (think "flight number")
    • color: Color of this line's name. One of red, green, blue, yellow ... (see substack/node-charm for details.

If, as the second argument, a String is passed instead of an Object, it is treated as a shortcut for {options: context: name: string}}.

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Install

npm i terminal-status-board

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Version

1.4.0

License

ISC

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