skypager-repl/src/extensions/history.js

an awesome repl

import { write, openSync, closeSync, statSync, readFileSync } from 'fs'

export default (repl, file) => {

  console.log('Setting up history', file)
  
  try {
    const stat = statSync(file) // eslint-disable-line
    repl.rli.history = readFileSync(file, 'utf-8').split('\n').reverse()
    repl.rli.history.shift()
    repl.rli.historyIndex = 0
  } catch (e) {}

  const fd = openSync(file, 'a')

  repl.rli.addListener('line', function(code) {
    if (code && code !== '.history') {
      write(fd, `${code}\n`, function() {
        
      })
    } else {
      repl.rli.historyIndex++
      repl.rli.history.pop()
    }
  })

  process.on('exit', function() {
    closeSync(fd)
  })

  repl.commands['.history'] = {
    help : 'Show the history',
    action() {
      const out = []
      repl.rli.history.forEach((v) => {
        out.push(v)
      })
      repl.outputStream.write(`${out.reverse().join('\n')}\n`, function(err) {
        
      })
      repl.displayPrompt()
    },
  }

  return repl
}