RxKotlin REPL

This is an example using RxKotlin to implement a simple REPL.

The supported commands are:

• history (or hist)
  • display previously executed commands
  • commands ending with "ck" are excluded (to emulate a profanity filter)
  • consecutive duplicates are displayed only once
• exit
  • ends application
• any arithmetic expression using integers and operators +, -, *, /
  • display the result of the operation as though it were evaluated in Javascript;
• anything else
  • just echo the command

There are two executable Kotlin files:

• Repl.kt starts the interactive REPL shell;
• FileRunner.kt reads a list of commands from file commands.txt and executes them in sequence.