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):

(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:
`````javascript

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

`````javascript

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

`````javascript

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

`````javascript

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

`````javascript

var map = contrib.map({label: 'World Map'})
map.addMarker({"lon" : "-79.0000", "lat" : "37.5000", color: "red", char: "X" })

`````

Gauge

`````javascript

var gauge = contrib.gauge({label: 'Progress', stroke: 'green', fill: 'white'})
gauge.setPercent(25)

`````

Stacked Gauge

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

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.
`````javascript

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

`````

Donut

`````javascript

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.
`````javascript

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:
`````javascript

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

`````javascript

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'})

`````
`````javascript

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

`````javascript

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.)
log

`````javascript

var pic = contrib.picture(
   { file: './flower.png'
   , cols: 25
   , onReady: ready})
function ready() {screen.render()}

`````
note: only png images are supported

Sparkline

`````javascript

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

`````javascript

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

`````javascript

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

keys : Key to expand nodes. Default : 'enter','default' extended : Should nodes be extended/generated by default? Be careful with this setting when using a callback function. Default : false template :

* extend : Suffix "icon" for closed node. Default : '[+]'
* retract : Suffix "icon" for opened node. Default : '[-]'
* lines : Show lines in tree. Default : true

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 :

name

Type : string Desc : Node name If the node isn't the root and you don't specify the name, will be set to hash key Example : { name: 'Fruit'}

children

Type : hash or function(node){ return children } Desc : Node children. The function must return a hash that could have been used as children property If you use a function, the result will be stored in node.childrenContent and children Example :
* Hash : <code>{'Fruit':{ name: 'Fruit', children:{ 'Banana': {}, 'Cherry': {}}}}</code> * Function : see `examples/explorer.js`
childrenContent
Type : hash Desc : Children content for internal usage DO NOT MODIFY If node.children is a hash, node.children===node.childrenContent If node.children is a function, it's used to store the node.children() result You can read this property, but you should never write it. Usually this will be used to check if(node.childrenContent) in your node.children function to generate children only once
extended
Type : boolean Desc : Determine if this node is extended No effect when the node have no child Default value for each node will be treeInstance.options.extended if the node extended option is not set Example : {'Fruit':{ name: 'Fruit', extended: true, children:{ 'Banana': {}, 'Cherry': {}}}}

Markdown

`````javascript

var markdown = contrib.markdown()
markdown.setMarkdown('# Hello \n blessed-contrib renders markdown using `marked-terminal`')

`````

Colors

You can use 256 colors (source):
`````javascript 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.
`````javascript

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:
`````javascript

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

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
`````javascript

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)

blessed-contrib

Downloads in past

Stats

Popular Searches

Readme

blessed-contrib

Installation (to build custom projects)

Usage

Widgets

Line Chart

Bar Chart

Stacked Bar Chart

Map

Gauge

Stacked Gauge

Donut

LCD Display

Rolling Log

Picture

Sparkline

Table

Tree

Options

Nodes

Markdown

Colors

Layouts

Grid

Carousel

Samples

Terminal Dashboard

Troubleshooting

License

More Information

blessed-contrib

Downloads in past1 Month3 Months6 Months1 Year2 Years5 YearsAll time

Stats

Popular Searches

Readme

blessed-contrib

Installation (to build custom projects)

Usage

Widgets

Line Chart

Bar Chart

Stacked Bar Chart

Map

Gauge

Stacked Gauge

Donut

LCD Display

Rolling Log

Picture

Sparkline

Table

Tree

Options

Nodes

Markdown

Colors

Layouts

Grid

Carousel

Samples

Terminal Dashboard

Troubleshooting

License

More Information

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