use ESM module syntax & minor cleanups

The biggest change here is moving various element classes under
more scope-specific directories, which helps to avoid circular
dependencies and is just cleaner to navigate and expand in the
future.

Otherwise this is a largely uncritical port to ESM module syntax!
There are probably a number of changes and other cleanups that
remain much needed.

Whenever I make changes to tui-lib it's hard to believe it's
already been <INSERT COUNTING NUMBER HERE> years since the
previous time. First commits are from January 2017, and the
code originates a month earlier in KAaRMNoD!

1 files changed, 0 insertions, 138 deletions

diff --git a/util/TelnetInterfacer.js b/util/TelnetInterfacer.js
deleted file mode 100644
index dc71157..0000000
--- a/util/TelnetInterfacer.js
+++ /dev/null
@@ -1,138 +0,0 @@
-const ansi = require('./ansi')
-const waitForData = require('./waitForData')
-const EventEmitter = require('events')
-
-module.exports = class TelnetInterfacer extends EventEmitter {
-  constructor(socket) {
-    super()
-
-    this.socket = socket
-
-    socket.on('data', buffer => {
-      if (buffer[0] === 255) {
-        this.handleTelnetData(buffer)
-      } else {
-        this.emit('inputData', buffer)
-      }
-    })
-
-    this.initTelnetOptions()
-  }
-
-  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())
-  }
-
-  async getScreenSize() {
-    this.socket.write(Buffer.from([255, 253, 31])) // IAC DO NAWS
-
-    let didWillNAWS = false
-    let didSBNAWS = false
-    let sb
-
-    inputLoop: while (true) {
-      const data = await waitForData(this.socket)
-
-      for (const command of this.parseTelnetCommands(data)) {
-        // WILL NAWS
-        if (command[1] === 251 && command[2] === 31) {
-          didWillNAWS = true
-          continue
-        }
-
-        // SB NAWS
-        if (didWillNAWS && command[1] === 250 && command[2] === 31) {
-          didSBNAWS = true
-          sb = command.slice(3)
-          continue
-        }
-
-        // SE
-        if (didSBNAWS && command[1] === 240) { // SE
-          break inputLoop
-        }
-      }
-    }
-
-    return this.parseSBNAWS(sb)
-  }
-
-  parseTelnetCommands(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 (const value of values) {
-        if (value === 255) { // IAC
-          commands.push(Array.from(curCmd))
-          curCmd.splice(1, curCmd.length)
-          continue
-        }
-        curCmd.push(value)
-      }
-      commands.push(curCmd)
-
-      return commands
-    } else {
-      return []
-    }
-  }
-
-  write(data) {
-    this.socket.write(data)
-  }
-
-  handleTelnetData(buffer) {
-    let didSBNAWS = false
-    let sbNAWS
-
-    for (let command of this.parseTelnetCommands(buffer)) {
-      // SB NAWS
-      if (command[1] === 250 && command[2] === 31) {
-        didSBNAWS = true
-        sbNAWS = command.slice(3)
-        continue
-      }
-
-      // SE
-      if (didSBNAWS && command[1] === 240) { // SE
-        didSBNAWS = false
-        this.emit('screenSizeUpdated', this.parseSBNAWS(sbNAWS))
-        this.emit('resize', this.parseSBNAWS(sbNAWS))
-        continue
-      }
-    }
-  }
-
-  parseSBNAWS(sb) {
-    const cols = (sb[0] << 8) + sb[1]
-    const lines = (sb[2] << 8) + sb[3]
-
-    return { cols, lines, width: cols, height: lines }
-  }
-}