forked from Raynos/cli-less
/
index.js
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index.js
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var Charm = require('charm')
var process = require('process')
var ansirecover = require('ansi-recover')
var raf = require('raf').polyfill
var restoreTTY = require('restoretty')
var Input = require('./input.js')
var State = require('./state.js')
var Update = require('./update.js')
var Render = require('./render.js')
// this recovers the terminal on process.exit()
ansirecover({ cursor: true, mouse: true })
module.exports = less
function less(tty) {
var input = Input(tty)
var events = input.events
var state = State({
height: process.stdout.rows,
width: process.stdout.columns
})
var charm = Charm()
// render initial and render on change
var loop = main(state, Render, charm)
events.exit(Update.exit.bind(null, state))
events.moveForward(Update.moveForward.bind(null, state))
events.moveForwardPage(Update.moveForwardPage.bind(null, state))
events.help(Update.setHelp.bind(null, state))
state.hardExit(exit)
return {
stream: charm,
addLine: Update.addLine.bind(null, state)
}
function exit() {
loop.destroy()
if (process.platform === 'win32') {
charm.reset()
}
restoreTTY()
process.exit()
}
}
function main(state, render, target) {
var dirty = false
var terminate = false
var currentState = state()
process.nextTick(function () {
render(target, currentState)
})
function markDirty() {
if (!dirty) {
dirty = true
}
}
state(function (state) {
markDirty()
currentState = state
})
raf(redraw)
return { destroy: destroy }
function destroy() {
terminate = true
}
function redraw() {
if (terminate) {
return
}
if (!dirty) {
return raf(redraw)
}
render(target, currentState)
dirty = false
raf(redraw)
}
}