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vt

v0.1.1

Published

terminal emulation library for javascript.

Downloads

69

Readme

terminal.js

Terminal.js is a rendering engine for vt100-like terminals. It is written from scratch and supports most commonly used escape sequences.

Build Status

Benefits

  • it can be used both in nodejs and as a javascript library in the browser
  • it avoids any dependencies like pty, html outputting etc so you can provide your own
  • it does not use an html dom to store it's state, this makes it server state compatible
  • clean separation of different escape codes
  • has a test framework

Usage

TermWriter Usage

var TermWriter = require('terminal').TermWriter;
var TermBuffer = require('terminal').TermBuffer;

var buffer = new TermBuffer(80,24);
var terminal = new TermWriter(termBuffer);
terminal.write("first test\n");
// termWriter.buffer is accessible

TermBuffer Usage

var TermBuffer = require('terminal').TermBuffer;
var buffer = new TermBuffer(80,24);
buffer.inject("first test\n");

TermDiff Usage

var TermDiff = require('terminal').TermDiff;
var TermBuffer = require('terminal').TermBuffer;

var buffer1 = new TermBuffer(80,24);
var buffer2 = new TermBuffer(80,24);

var terminal1 = new TermWriter(buffer1);
var terminal2 = new TermWriter(buffer2);

terminal1.write("test me");
var diff = new TermDiff(terminal1.buffer,terminal2.buffer);

diff.apply(terminal1);

TermBuffer Functions

  • createChar

  • createLine

  • getLine

  • write

  • escapeWrite

  • inject

  • lineFeed

  • mvCur : moves to relative coordinates

  • setCur : move to absolute coordinates

  • mvTab

  • tabSet

  • tabClear

  • saveCursor

  • restoreCursor

  • deleteCharacters

  • eraseCharacters

  • setScrollRegion

  • eraseInDisplay

  • eraseInLine

  • deleteLines

  • resetAttr

  • chAttr

  • insertBlanks

  • resize

  • insertLines

  • toString

  • setLed

  • scroll

  • eventToKey

TermBuffer Object structure

TermDiff structure

diff = {
  changes: [
    { l: 0, '.': { // On line0 replace the line
      str: 'test', // With string test
      attr{
      '0': { fg: null, bg:null, bold:false , underline: false, blink: false, inverse: false }, // Change Attributes on Pos0
      '2': { fg: null, bg:null, bold:false , underline: false, blink: false, inverse: true  }  // Change Attributes on Pos2
      }
    },
    { l: 1, '+': { // Online 1 add a line
      str: 'test', // With String test
      attr{
      '0': { fg: null, bg:null, bold:false , underline: false, blink: false, inverse: false }, // Change Attributes on Pos0
      '2': { fg: null, bg:null, bold:false , underline: false, blink: false, inverse: true  }  // Change Attributes on Pos2
      }
    },
    { l: 2, '-': 3 }, // On line2 remove 3 lines
  ],
  cursor: [ { from: { 'x': 0, 'y':10 }, to: { 'x': 0, 'y':12 } } ],
  savedcursor: [ { from: { 'x': 0, 'y':10 }, to: { 'x': 0, 'y':12 } } ],
  size: [ { from: { 'height': 80, 'width':24 }, to: { 'height': 30, 'width':12 } } ],
  scrollregion: [ {from: [ 0, 10 ], to: [ 0, 12 ] } ],
  modes: [ { 'graphic': true }, { 'insert': false } ],
  tabs: [ { from: [] , to: [ 1 ] }]
}

Alternatives & Related

Jquery/Server side:

Expose local shell in a browser:

Simulate a pseudo shell in browser:

Reference docs for vt100, csi , ... codes

Remarks

  • we should clone the defaultBuffer instead of equalling it (see reset function)
  • attrCommited? always after changr of attr?
  • this.attr = this.defaultAttr (again it should copy it not equal the object)
  • Termdiff.diff() - should it not be an array instead of a hash?