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blessed-contrib

Build dashboards (or any other application) using ascii/ansi art and javascript.

Friendly to terminals, ssh and developers. Extends blessed with custom drawille and other widgets.

You should also check WOPR: a markup for creating terminal reports, presentations and infographics.

Contributors:

Yaron Naveh (@YaronNaveh) Chris (@xcezzz) Miguel Valadas (@mvaladas) Liran Tal (@lirantal)

Demo (full size):

<img src="./docs/images/truload.png" alt="term" width="800"> <img src="./docs/images/term3.gif" alt="term" width="800">

(source code)

Running the demo

git clone https://github.com/yaronn/blessed-contrib.git
cd blessed-contrib
npm install
node ./examples/dashboard.js

Works on Linux, OS X and Windows. For Windows follow the pre requisites.

Installation (to build custom projects)

npm install blessed blessed-contrib

Usage

You can use any of the default widgets of blessed (texts, lists and etc) or the widgets added in blessed-contrib (described below). A layout is optional but useful for dashboards. The widgets in blessed-contrib follow the same usage pattern:

   var blessed = require('blessed')
     , contrib = require('blessed-contrib')
     , screen = blessed.screen()
     , line = contrib.line(
         { style:
           { line: "yellow"
           , text: "green"
           , baseline: "black"}
         , xLabelPadding: 3
         , xPadding: 5
         , label: 'Title'})
     , data = {
         x: ['t1', 't2', 't3', 't4'],
         y: [5, 1, 7, 5]
      }
   screen.append(line) //must append before setting data
   line.setData([data])

   screen.key(['escape', 'q', 'C-c'], function(ch, key) {
     return process.exit(0);
   });

   screen.render()

See below for a complete list of widgets.

Widgets

Line Chart

Bar Chart

Stacked Bar Chart

Map

Gauge

Stacked Gauge

Donut

LCD Display

Rolling Log

Picture

Sparkline

Table

Tree

Markdown

Line Chart

<img src="./docs/images/line.gif" alt="line" width="400">
   var line = contrib.line(
         { style:
           { line: "yellow"
           , text: "green"
           , baseline: "black"}
         , xLabelPadding: 3
         , xPadding: 5
         , showLegend: true
         , wholeNumbersOnly: false //true=do not show fraction in y axis
         , label: 'Title'})
   var series1 = {
         title: 'apples',
         x: ['t1', 't2', 't3', 't4'],
         y: [5, 1, 7, 5]
      }
   var series2 = {
         title: 'oranges',
         x: ['t1', 't2', 't3', 't4'],
         y: [2, 1, 4, 8]
      }
   screen.append(line) //must append before setting data
   line.setData([series1, series2])

Examples: simple line chart, multiple lines, 256 colors

Bar Chart

<img src="./docs/images/bar.gif" alt="bar" width="250">
    var bar = contrib.bar(
       { label: 'Server Utilization (%)'
       , barWidth: 4
       , barSpacing: 6
       , xOffset: 0
       , maxHeight: 9})
    screen.append(bar) //must append before setting data
    bar.setData(
       { titles: ['bar1', 'bar2']
       , data: [5, 10]})

Stacked Bar Chart

<img src="./docs/images/stacked-bar.png" alt="stacked-bar" width="250">
    bar = contrib.stackedBar(
       { label: 'Server Utilization (%)'
       , barWidth: 4
       , barSpacing: 6
       , xOffset: 0
       //, maxValue: 15
       , height: "40%"
       , width: "50%"
       , barBgColor: [ 'red', 'blue', 'green' ]})
    screen.append(bar)
    bar.setData(
       { barCategory: ['Q1', 'Q2', 'Q3', 'Q4']
       , stackedCategory: ['US', 'EU', 'AP']
       , data:
          [ [ 7, 7, 5]
          , [8, 2, 0]
          , [0, 0, 0]
          , [2, 3, 2] ]
       })

Map

<img src="./docs/images/map.gif" alt="map" width="500">
   var map = contrib.map({label: 'World Map'})
   map.addMarker({"lon" : "-79.0000", "lat" : "37.5000", color: "red", char: "X" })

Gauge

<img src="./docs/images/gauge.gif" alt="gauge" width="170">
   var gauge = contrib.gauge({label: 'Progress', stroke: 'green', fill: 'white'})
   gauge.setPercent(25)

Stacked Gauge

<img src="./docs/images/stackgauge.gif" alt="stackedgauge">

Either specify each stacked portion with a percent and stroke...

   var gauge = contrib.gauge({label: 'Stacked '})
   gauge.setStack([{percent: 30, stroke: 'green'}, {percent: 30, stroke: 'magenta'}, {percent: 40, stroke: 'cyan'}])

Or, you can just supply an array of numbers and random colors will be chosen.

   var gauge = contrib.gauge({label: 'Stacked Progress'})
   gauge.setStack([30,30,40])

Donut

<img src="./docs/images/donut.gif" alt="donut">
   var donut = contrib.donut({
	label: 'Test',
	radius: 8,
	arcWidth: 3,
	remainColor: 'black',
	yPadding: 2,
	data: [
	  {percent: 80, label: 'web1', color: 'green'}
	]
  });

Data passed in uses percent and label to draw the donut graph. Color is optional and defaults to green.

   donut.setData([
   	{percent: 87, label: 'rcp','color': 'green'},
	{percent: 43, label: 'rcp','color': 'cyan'},
   ]);

Updating the donut is as easy as passing in an array to setData using the same array format as in the constructor. Pass in as many objects to the array of data as you want, they will automatically resize and try to fit. However, please note that you will still be restricted to actual screen space.

You can also hardcode a specific numeric into the donut's core display instead of the percentage by passing an percentAltNumber property to the data, such as:

   var donut = contrib.donut({
	label: 'Test',
	radius: 8,
	arcWidth: 3,
	remainColor: 'black',
	yPadding: 2,
	data: [
	  {percentAltNumber: 50, percent: 80, label: 'web1', color: 'green'}
	]
  });

See an example of this in one of the donuts settings on ./examples/donut.js.

LCD Display

<img src="./docs/images/lcd.gif" alt="lcd">
   var lcd = contrib.lcd(
     { segmentWidth: 0.06 // how wide are the segments in % so 50% = 0.5
     , segmentInterval: 0.11 // spacing between the segments in % so 50% = 0.550% = 0.5
     , strokeWidth: 0.11 // spacing between the segments in % so 50% = 0.5
     , elements: 4 // how many elements in the display. or how many characters can be displayed.
     , display: 321 // what should be displayed before first call to setDisplay
     , elementSpacing: 4 // spacing between each element
     , elementPadding: 2 // how far away from the edges to put the elements
     , color: 'white' // color for the segments
     , label: 'Storage Remaining'})

	lcd.setDisplay(23 + 'G'); // will display "23G"
	lcd.setOptions({}) // adjust options at runtime

Please see the examples/lcd.js for an example. The example provides keybindings to adjust the segmentWidth and segmentInterval and strokeWidth in real-time so that you can see how they manipulate the look and feel.

Rolling Log

<img src="./docs/images/log.gif" alt="log" width="180">
   var log = contrib.log(
      { fg: "green"
      , selectedFg: "green"
      , label: 'Server Log'})
   log.log("new log line")

Picture

(Also check the new blessed image implementation which has several benefits over this one.)

<img src="./docs/images/picture.png" alt="log" width="180">
    var pic = contrib.picture(
       { file: './flower.png'
       , cols: 25
       , onReady: ready})
    function ready() {screen.render()}

note: only png images are supported

Sparkline

<img src="./docs/images/spark.gif" alt="spark" width="180">
   var spark = contrib.sparkline(
     { label: 'Throughput (bits/sec)'
     , tags: true
     , style: { fg: 'blue' }})

   sparkline.setData(
   [ 'Sparkline1', 'Sparkline2'],
   [ [10, 20, 30, 20]
   , [40, 10, 40, 50]])

Table

<img src="./docs/images/table.gif" alt="table" width="250">
   var table = contrib.table(
     { keys: true
     , fg: 'white'
     , selectedFg: 'white'
     , selectedBg: 'blue'
     , interactive: true
     , label: 'Active Processes'
     , width: '30%'
     , height: '30%'
     , border: {type: "line", fg: "cyan"}
     , columnSpacing: 10 //in chars
     , columnWidth: [16, 12, 12] /*in chars*/ })

   //allow control the table with the keyboard
   table.focus()

   table.setData(
   { headers: ['col1', 'col2', 'col3']
   , data:
      [ [1, 2, 3]
      , [4, 5, 6] ]})

Tree

<img src="./docs/images/tree.gif" alt="table" width="250">
   var tree = contrib.tree({fg: 'green'})

   //allow control the table with the keyboard
   tree.focus()

   tree.on('select',function(node){
     if (node.myCustomProperty){
       console.log(node.myCustomProperty);
     }
     console.log(node.name);
   }

   // you can specify a name property at root level to display root
   tree.setData(
   { extended: true
   , children:
     {
       'Fruit':
       { children:
         { 'Banana': {}
         , 'Apple': {}
         , 'Cherry': {}
         , 'Exotics': {
             children:
             { 'Mango': {}
             , 'Papaya': {}
             , 'Kiwi': { name: 'Kiwi (not the bird!)', myCustomProperty: "hairy fruit" }
             }}
         , 'Pear': {}}}
     , 'Vegetables':
       { children:
         { 'Peas': {}
         , 'Lettuce': {}
         , 'Pepper': {}}}}})

Options

Nodes

Every node is a hash and it can have custom properties that can be used in "select" event callback. However, there are several special keys :

Markdown

<img src="./docs/images/markdown.png" alt="table">
   var markdown = contrib.markdown()
   markdown.setMarkdown('# Hello \n blessed-contrib renders markdown using `marked-terminal`')

Colors

You can use 256 colors (source):

  function randomColor() {
    return [Math.random() * 255,Math.random()*255, Math.random()*255]
  }

  line = contrib.line(
  {
    ...
    , style: { line: randomColor(), text: randomColor(), baseline: randomColor() }
  })

Layouts

Grid

Carousel

Grid

A grid layout can auto position your elements in a grid layout. When using a grid, you should not create the widgets, rather specify to the grid which widget to create and with which params. Each widget can span multiple rows and columns.

   var screen = blessed.screen()

   var grid = new contrib.grid({rows: 12, cols: 12, screen: screen})

   //grid.set(row, col, rowSpan, colSpan, obj, opts)
   var map = grid.set(0, 0, 4, 4, contrib.map, {label: 'World Map'})
   var box = grid.set(4, 4, 4, 4, blessed.box, {content: 'My Box'})

   screen.render()

Carousel

A carousel layout switches between different views based on time or keyboard activity. One use case is an office dashboard with rotating views:

    var blessed = require('blessed')
      , contrib = require('./')
      , screen = blessed.screen()

    function page1(screen) {
       var map = contrib.map()
       screen.append(map)
    }

    function page2(screen) {
      var line = contrib.line(
       { width: 80
       , height: 30
       , left: 15
       , top: 12
       , xPadding: 5
       , label: 'Title'
       })

      var data = [ { title: 'us-east',
                 x: ['t1', 't2', 't3', 't4'],
                 y: [0, 0.0695652173913043, 0.11304347826087, 2],
                 style: {
                  line: 'red'
                 }
               }
            ]

      screen.append(line)
      line.setData(data)
    }

    screen.key(['escape', 'q', 'C-c'], function(ch, key) {
      return process.exit(0);
    });

    var carousel = new contrib.carousel( [page1, page2]
                                       , { screen: screen
                                         , interval: 3000 //how often to switch views (set 0 to never swicth automatically)
                                         , controlKeys: true  //should right and left keyboard arrows control view rotation
                                         })
    carousel.start()

Samples

Terminal Dashboard

<img src="./docs/images/term3.gif" alt="term" width="800">

Running the sample

git clone https://github.com/yaronn/blessed-contrib.git
cd blessed-contrib
npm install
node ./examples/dashboard.js

Installation (for a custom dashboard)

npm install blessed
npm install blessed-contrib

A simple dashboard

   var blessed = require('blessed')
     , contrib = require('blessed-contrib')
     , screen = blessed.screen()
     , grid = new contrib.grid({rows: 1, cols: 2, screen: screen})

   var line = grid.set(0, 0, 1, 1, contrib.line,
     { style:
       { line: "yellow"
       , text: "green"
       , baseline: "black"}
     , xLabelPadding: 3
     , xPadding: 5
     , label: 'Stocks'})

   var map = grid.set(0, 1, 1, 1, contrib.map, {label: 'Servers Location'})

   var lineData = {
      x: ['t1', 't2', 't3', 't4'],
      y: [5, 1, 7, 5]
   }

   line.setData([lineData])

   screen.key(['escape', 'q', 'C-c'], function(ch, key) {
     return process.exit(0);
   });

   screen.render()

Rich dashboard

See source code

Troubleshooting

If you see questions marks or some (or all) missign characters try running with these env vars to fix encoding / terminal:

    $> LANG=en_US.utf8 TERM=xterm-256color node your-code.js 

License

This library is under the MIT License

More Information

Created by Yaron Naveh (twitter, blog)