How to handle multiple user inputs into a match? - rust

Question

I'm new to programming and I got stucked while trying to get user's input in a match expression. I read the documentation but I didn't find the answer to my problem.
The idea is simple : the user chooses a game mode (Human Vs Human or Human Vs Machine) then the program asks for the user's name. I don't get any error but the program lets me enter only the second name (player_2) but not the first one (player_1). It's like if the program is not stoping for me to enter the first player name.
Here is the code I wrote :
use std::io;
use text_io::read;
fn player_input() -> String {
let mut input = String::new();
io::stdin()
.read_line(&mut input)
.expect("Wrong input");
return input;
}
fn main() {
println!("GAME MODE");
println!("1. Human Vs Human");
println!("2. Human Vs Machine");
let game_mode : String = read!();
match game_mode.as_str() {
"1" => {
println!("Player 1 : \n");
let player_1 = player_input();
println!("Player 2 : ");
let player_2 = player_input();
println!("{} - {}", player_1, player_2);
},
"2" => {
println!("Player 1 : ");
let player_1 = player_input();
let player_2 = "Skynet";
println!("{} - {}", player_1, player_2);
},
_ => println!("Wrong input"),
};
}
And here is the output I get :
GAME MODE
1. Human Vs Human
2. Human Vs Machine
1
Player 1 :
Player 2 :
George
- George
I don't know what am I doing wrong because if I test the same code but without the match expression the program actually stops and lets me enter the first name (player_1) before asking me for the second one (player_2). Maybe match is not the way to do it and I should rather use an if/else ?
Thank you for your help

Answer 1

This is definitley not a problem with match. Your problem seems to occur because the read! macro doesn't remove the whitespace that causes it to end (in this case, \n). Then, the first call to player_input reads the \n and immediatley stops. Only then does the second call to player_input actually pick up any input. You can fix this in two different ways:
-You can not use text_io and simply rely on the built in std::io, which does remove the \n that caused its call to end
-You can change the read! call to also pick up the \n like so: read!("{}\n")