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const iac = require('iac')
const ansi = require('../ansi')
const DisplayElement = require('./DisplayElement')
const FocusElement = require('./form/FocusElement')
module.exports = class Root extends DisplayElement {
// An element to be used as the root of a UI. Handles lots of UI and
// socket stuff.
constructor(socket) {
super()
this.socket = socket
this.initTelnetOptions()
this.selected = null
this.cursorBlinkOffset = Date.now()
socket.on('data', buf => this.handleData(buf))
}
initTelnetOptions() {
// Initializes various socket options, using telnet magic.
// Disables linemode.
this.socket.write(Buffer.from([
255, 253, 34, // IAC DO LINEMODE
255, 250, 34, 1, 0, 255, 240, // IAC SB LINEMODE MODE 0 IAC SE
255, 251, 1 // IAC WILL ECHO
]))
// Will SGA. Helps with putty apparently.
this.socket.write(Buffer.from([
255, 251, 3 // IAC WILL SGA
]))
this.socket.write(ansi.hideCursor())
}
cleanTelnetOptions() {
// Resets the telnet options and magic set in initTelnetOptions.
this.socket.write(ansi.resetAttributes())
this.socket.write(ansi.showCursor())
}
requestTelnetWindowSize() {
// See RFC #1073 - Telnet Window Size Option
return new Promise((res, rej) => {
this.socket.write(Buffer.from([
255, 253, 31 // IAC WILL NAWS
]))
this.once('telnetsub', function until(sub) {
if (sub[0] !== 31) { // NAWS
this.once('telnetsub', until)
} else {
res({lines: sub[4], cols: sub[2]})
}
})
})
}
handleData(buffer) {
if (buffer[0] === 255) {
// Telnet IAC (Is A Command) - ignore
// Split the data into multiple IAC commands if more than one IAC was
// sent.
const values = Array.from(buffer.values())
const commands = []
const curCmd = [255]
for (let value of values) {
if (value === 255) { // IAC
commands.push(Array.from(curCmd))
curCmd.splice(1, curCmd.length)
continue
}
curCmd.push(value)
}
commands.push(curCmd)
for (let command of commands) {
this.interpretTelnetCommand(command)
}
return
}
if (this.selected) {
const els = this.selected.directAncestors.concat([this.selected])
for (let el of els) {
if (el instanceof FocusElement) {
const shouldBreak = (el.keyPressed(buffer) === false)
if (shouldBreak) {
break
}
el.emit('keypressed', buffer)
}
}
}
}
interpretTelnetCommand(command) {
if (command[0] !== 255) { // IAC
// First byte isn't IAC, which means this isn't a command, so do
// nothing.
return
}
if (command[1] === 251) { // WILL
// Do nothing because I'm lazy
const willWhat = command[2]
//console.log('IAC WILL ' + willWhat)
}
if (command[1] === 250) { // SB
this.telnetSub = command.slice(2)
}
if (command[1] === 240) { // SE
this.emit('telnetsub', this.telnetSub)
this.telnetSub = null
}
}
drawTo(writable) {
writable.write(ansi.moveCursor(0, 0))
writable.write(' '.repeat(this.w * this.h))
}
didRenderTo(writable) {
// Render the cursor, based on the cursorX and cursorY of the currently
// selected element.
if (
this.selected &&
typeof this.selected.cursorX === 'number' &&
typeof this.selected.cursorY === 'number' &&
(Date.now() - this.cursorBlinkOffset) % 1000 < 500
) {
writable.write(ansi.moveCursor(
this.selected.absCursorY, this.selected.absCursorX))
writable.write(ansi.invert())
writable.write('I')
writable.write(ansi.resetAttributes())
}
writable.write(ansi.moveCursor(0, 0))
}
cursorMoved() {
// Resets the blinking animation for the cursor. Call this whenever you
// move the cursor.
this.cursorBlinkOffset = Date.now()
}
select(el) {
// Select an element. Calls the unfocus method on the already-selected
// element, if there is one.
if (this.selected) {
this.selected.unfocus()
}
this.selected = el
this.selected.focus()
this.cursorMoved()
}
}
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