JSPM – blessed-contrib@2.0.4

Package Exports

blessed-contrib
blessed-contrib/lib/utils
blessed-contrib/lib/widget/canvas

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (blessed-contrib) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

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.

Contributors:

Yaron Naveh (@YaronNaveh)

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

Tested on Linux and OS X. In order to use on windows need to install Braille fonts (not tested).

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 bellow). A layout is optional but usefull 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 bellow for a complete list of widgets.

Widgets

Line Chart

   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: [5, 1, 7, 5]
      }
   screen.append(line) //must append before setting data
   line.setData([series1, series2])

Examples: simple line chart, multiple lines

Bar Chart

    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]})

Map

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

Gauge

   var gauge = contrib.gauge({label: 'Progress'})
   gauge.setPercent(25)

Rolling Log

   var log = contrib.log(
      { fg: "green"
      , selectedFg: "green"
      , label: 'Server Log'})
   log.log("new log line")

Picture

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

note: only png images are supported

Sparkline

   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

   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

   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 : {'Fruit':{ name: 'Fruit', children:{ 'Banana': {}, 'Cherry': {}}}}
- 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': {}}}}

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, 2, 2, contrib.map, {label: 'World Map'})
   var box = grid.set(0, 6, 2, 2, blessed.box, {content: 'My Box'})

   screen.render()

Carousel

A carousel layout switchs between differen views based on time or keyboard activity. One use case is 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

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 dashbaord)

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

License

This library is under the MIT License

More Information

Created by Yaron Naveh (twitter, blog)