ansi-diff

A module that diffs an input buffer with the previous one provided to it and outputs the diff as ANSI. If you write out the diff to the terminal it will update the previous output with minimal changes

npm install ansi-diff

Usage

var diff = require('ansi-diff')({
  // if you want to support word wrapping, provide the terminal width
  width: process.stdout.columns
})

// render now
render()

// render every 1s
setInterval(render, 1000)

function render () {
  // will update the terminal with minimal changes
  process.stdout.write(diff.update('hello world...\n' + new Date()))
}

It also has terminal resize support

process.stdout.on('resize', function () {
  diff.resize({width: process.stdout.columns})
  render()
})

API

var diff = ansiDiff([options])

Create a new differ. Options include:

{
  width: terminalWidth,
  height: terminalHeight
}

If you provide the terminal width ansi-diff will be able to support word wrapping done by the terminal. That means that if you print out a line that is too long to fit in the terminal the diff will still work.

var changes = diff.update(buffer, opts)

Update the buffer and return the diff between this and the previous one. The diff is returned in ANSI as a buffer so you can write it out to the terminal.

• opts.moveTo - array of [column,row] to move the cursor after diffing the screen (in absolute coordinates)

diff.resize([options])

Update the terminal width / height. If you are writing to stdout you should update the width when process.stdout.on('resize') is fired.

Options should look like this:

{
  width: terminalWidth,
  height: terminalHeight
}

diff.toString()

Returns the last diffed string.

diff.width

Property containing the last set terminal width.

diff.height

Property containing the last set terminal height.

License