This lesson's interactive features are locked, please to keep using them

REPL

REPL stands for "read-eval-print loop". It's a common type of program that allows for interactivity. You type in a command, and the program evaluates it and prints the result. You can then type in another command, and so on.

Your native terminal's command line is a REPL! Our Pokedex will also be a REPL. In this step, we're just going to build the bones of the REPL: a loop that parses and cleans an input and prints the first word back to the user. Here is what your program should be able to do after this step:

> go run .
Pokedex > help me
help
Pokedex > Exit
exit
Pokedex > WHAT even is a pokeman?
what

Pokedex > is our own custom command line prompt. The program waited and recorded my input (in the first instance, help me) and didn't continue until I pressed enter.

Assignment

Remove your "Hello, World!" logic.
Create support for a simple REPL
- Create a bufio.Scanner that reads from os.Stdin, for example: scanner := bufio.NewScanner(os.Stdin). When you later call scanner.Scan it will block and wait for input until the user presses enter.
- Start an infinite for loop. This loop will execute once for every command the user types in (we don't want to exit the program after just one command)
  - Use fmt.Print to print the prompt Pokedex > without a newline character
  - Use the scanner's .Scan and .Text methods to get the user's input as a string
  - Clean the user's input string
  - Capture the first "word" of the input and use it to print: Your command was: <first word>
Test your program. Here's my example session:

wagslane@MacBook-Pro-2 pokedexcli % go run .
Pokedex > well hello there
Your command was: well
Pokedex > Hello there
Your command was: hello
Pokedex > POKEMON was underrated
Your command was: pokemon

You can terminate the program by pressing ctrl+c.

Run the CLI again and tee the output (copies the stdout) to a new file called repl.log (and .gitignore the log).

go run . | tee repl.log

Use this as the first input: CHARMANDER is better than bulbasaur.
Use this as the second input: Pikachu is kinda mean to ash.
Terminate the program by pressing ctrl+c.

Run and submit the CLI tests.