This is a Node.js toolkit for quickly building nice looking command line interfaces which can respond to changing terminal sizes. It also includes the following easy to use components:
- Gauges
- Progress Bars
- Sparklines
- Spinners
Updates
October 8, 2014 - Adding Line.contents() for fetching the contents of a line as a string.
June 2, 2014 - Fixed a crash caused by inability to locate the required trim helper in the latest version of cli-color. (And locked down the version of the cli-color dependency to stop this from ever happening again.) Also removed lodash as a dependency in favor of vanilla JS, to keep installs faster and smaller than ever.
Creates an object for buffering a group of text lines and then outputting them. When printing lines using LineBuffer it will crop off extra width and height so that the lines will fit into a specific space.
Options
The following options can be passed in on creation of the LineBuffer
x- The X location of where to draw the lines in this buffer.y- The Y location of where the draw the lines.width- How wide the buffer is in columns. Any lines longer than this will be cropped. You can specify either an integer value or'console'in order to let the width of the console determine the width of theLineBuffer.height- How high the buffer is in rows. You can either pass in an integer value or'console'to let the height on the console determine the height of theLineBuffer.scroll- Where the user is scrolled to in the buffer
Functions
height()- Return the height of theLineBuffer, in case you specified it as'console'width()- Return the width of theLineBuffer, in case you specified it as'console'addLine(Line)- Put aLineobject into theLineBuffer.fill()- If you don't have enough lines in the buffer this will fill the rest of the lines with empty space.output()- Draw theLineBufferto screen.
Example
var CLI = require('clui'),
clc = require('cli-color');
var Line = CLI.Line,
LineBuffer = CLI.LineBuffer;
var outputBuffer = new LineBuffer({
x: 0,
y: 0,
width: 'console',
height: 'console'
});
var message = new Line(outputBuffer)
.column('Title Placehole', 20, [clc.green])
.fill()
.store();
var blankLine = new Line(outputBuffer)
.fill()
.store();
var header = new Line(outputBuffer)
.column('Suscipit', 20, [clc.cyan])
.column('Voluptatem', 20, [clc.cyan])
.column('Nesciunt', 20, [clc.cyan])
.column('Laudantium', 11, [clc.cyan])
.fill()
.store();
var line;
for(var l = 0; l < 20; l++)
{
line = new Line(outputBuffer)
.column((Math.random()*100).toFixed(3), 20)
.column((Math.random()*100).toFixed(3), 20)
.column((Math.random()*100).toFixed(3), 20)
.column((Math.random()*100).toFixed(3), 11)
.fill()
.store();
}
outputBuffer.output();This chainable object can be used to generate a line of text with columns, padding, and fill. The parameter outputBuffer can be provided to save the line of text into a LineBuffer object for future outputting, or you can use LineBuffer.addLine() to add a Line object into a LineBuffer.
Alternatively if you do not wish to make use of a LineBuffer you can just use Line.output() to output the Line immediately rather than buffering it.
Chainable Functions
padding(width)- Outputwidthcharacters of blank space.column(text, width, styles)- Output text within a column of the specified width. If the text is longer thanwidthit will be truncated, otherwise extra padding will be added until it iswidthcharacters long. Thestylesvariable is a list of cli-color styles to apply to this column.fill()- At the end of a line fill the rest of the columns to the right edge of the terminal with whitespace to erase any content there.output()- Print the generated line of text to the console.contents()- Return the contents of this line as a string.
Example
var clui = require('clui'),
clc = require('cli-color'),
Line = clui.Line;
var headers = new Line()
.padding(2)
.column('Column One', 20, [clc.cyan])
.column('Column Two', 20, [clc.cyan])
.column('Column Three', 20, [clc.cyan])
.column('Column Four', 20, [clc.cyan])
.fill()
.output();
var line = new Line()
.padding(2)
.column((Math.random()*100).toFixed(3), 20)
.column((Math.random()*100).toFixed(3), 20)
.column((Math.random()*100).toFixed(3), 20)
.column((Math.random()*100).toFixed(3), 20)
.fill()
.output();
Draw a basic horizontal gauge to the screen.
Parameters
value- The current value of the metric being displayed by this gaugemaxValue- The highest possible value of the metric being displayedgaugeWidth- How many columns wide to draw the gaugedangerZone- The point after which the value will be drawn in red because it is too highsuffix- A value to output after the gauge itself.
Example
var os = require('os'),
clui = require('clui');
var Gauge = clui.Gauge;
var total = os.totalmem();
var free = os.freemem();
var used = total - free;
var human = Math.ceil(used / 1000000) + ' MB';
console.log(Gauge(used, total, 20, total * 0.8, human));
A simple command line sparkline that draws a series of values, and highlights the peak for the period. It also automatically outputs the current value and the peak value at the end of the sparkline.
Parameters
values- An array of values to go into the sparklinesuffix- A suffix to use when drawing the current and max values at the end of sparkline
Example
var Sparkline = require('clui').Sparkline;
var reqsPerSec = [10,12,3,7,12,9,23,10,9,19,16,18,12,12];
console.log(Sparkline(reqsPerSec, 'reqs/sec'));
Parameters
length- The desired length of the progress bar in characters.
Methods
update(currentValue, maxValue)- Returns the progress bar min/max content to write to stdout. Allows for dynamic max values.update(percent)- Returns the progress bar content as a percentage to write to stdout.0.0 > value < 1.0.
Example
var clui = require('clui');
var Progress = clui.Progress;
var thisProgressBar = new Progress(20);
console.log(thisProgressBar.update(10, 30));
// or
var thisPercentBar = new Progress(20);
console.log(thisPercentBar.update(0.4));
Parameters
statusText- The default status text to display while the spinner is spinning.style- Array of graphical characters used to draw the spinner. By default, on Windows: ['|', '/', '-', ''], on other platforms: ['◜','◠','◝','◞','◡','◟']
Methods
start()- Show the spinner on the screen.message(statusMessage)- Update the status message that follows the spinner.stop()- Erase the spinner from the screen.
Note: The spinner is slightly different from other Clui controls in that it outputs directly to the screen, instead of just returning a string that you output yourself.
Example
var CLI = require('clui'),
Spinner = CLI.Spinner;
var countdown = new Spinner('Exiting in 10 seconds... ', ['⣾','⣽','⣻','⢿','⡿','⣟','⣯','⣷']);
countdown.start();
var number = 10;
setInterval(function () {
number--;
countdown.message('Exiting in ' + number + ' seconds... ');
if (number === 0) {
process.stdout.write('\n');
process.exit(0);
}
}, 1000);Copyright (C) 2014 Nathan Peck (https://github.com/nathanpeck)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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