♻️ redo everything to get rid of the dependency injection.

It wasn't gonna work out the way I hoped.

src/main.rs

@@ -46,52 +46,26 @@ fn read_input () -> Result <String> {
 	Ok (buffer)
 }
 
-trait Io {
+fn print_help () -> Response {
-	fn print (&mut self, s: &str);
+	Response::PrintMany (vec! [
-	fn read_input (&mut self) -> Result <String>;
-	fn sleep (&mut self, milliseconds: u32);
-	
-	fn print_many <'a, I: IntoIterator <Item=&'a str>> (&mut self, lines: I) {
-		for line in lines {
-			self.print (line);
-		}
-	}
-}
-
-#[derive (Default)]
-struct Stdio {}
-
-impl Io for Stdio {
-	fn print (&mut self, s: &str) {
-		print (s)
-	}
-	
-	fn read_input (&mut self) -> Result <String> {
-		read_input ()
-	}
-	
-	fn sleep (&mut self, milliseconds: u32) {
-		use std::{
-			thread::sleep,
-			time::Duration,
-		};
-		
-		sleep (Duration::from_millis (milliseconds.into ()));
-	}
-}
-
-fn print_help <I: Io> (io: &mut I) {
-	io.print_many ([
 		"All commands are ASCII and case-insensitive.",
 		"Commands should start with a verb like LOOK.",
 		"e.g. `look table`",
 		"Single-word verbs are better, e.g. prefer `hint` over `give me a hint`",
 		"When in doubt, try generic verbs like `look` or `use` over specific verbs like `actuate`, `type`, or `consolidate`.",
-	]);
+	])
 }
 
-fn print_undetected_item <I: Io> (io: &mut I) {
+fn line_response <S: Into <String>> (line: S) -> Response {
-	io.print ("That ITEM does not exist in this ROOM, or you have not detected it.");
+	Response::Print (line.into ())
+}
+
+fn undetected_item () -> Response {
+	line_response ("That ITEM does not exist in this ROOM, or you have not detected it.")
+}
+
+fn just <T> (t: T) -> Vec <T> {
+	vec! [t]
 }
 
 #[derive (Debug, PartialEq)]
@@ -211,61 +185,74 @@ struct StateRoom1 {
 	detected_note: bool,
 }
 
+enum Response {
+	Print (String),
+	PrintMany (Vec <&'static str>),
+	Sleep (u32),
+	Quit,
+	JokeEnding,
+}
+
 #[derive (Clone, Default)]
 struct State {
-	quitting: bool,
 	room_1: StateRoom1,
 }
 
-fn room_1 <I: Io> (io: &mut I, state: &mut State) -> Result <()> {
+impl State {
-	let input = io.read_input ()?;
+	fn room_1 (&mut self, input: String) -> Result <Vec <Response>> {
+		use Response::*;
+		
 		let action = parse_input (&input);
 		
-	match action {
+		Ok (match action {
 			PlayerAction::Quit => {
-			io.print ("Bye.");
+				vec! [
-			state.quitting = true;
+					line_response ("Bye."),
+					Quit,
+				]
 			}
 			PlayerAction::Help => {
-			print_help (io);
+				just (print_help ())
 			},
 			PlayerAction::Hint => {
-			io.print ("Hint for this room: Try using the `help` command.");
+				just (line_response ("Hint for this room: Try using the `help` command."))
 			},
 			PlayerAction::Nonsense => {
-			io.print ("I couldn't understand that. Try `help` or `hint`.");
+				vec! [
-			io.print ("`hint` may contain spoilers. `help` will not.");
+					line_response ("I couldn't understand that. Try `help` or `hint`."),
+					line_response ("`hint` may contain spoilers. `help` will not."),
+				]
 			},
 			PlayerAction::Wait => {
-			io.print ("You wait around a bit. You can hear humming from the electrical lights, and the distant rumble of the building's HVAC system. The room smells faintly of fresh paint. Nothing has changed.");
+				just (line_response ("You wait around a bit. You can hear humming from the electrical lights, and the distant rumble of the building's HVAC system. The room smells faintly of fresh paint. Nothing has changed."))
 			},
 			PlayerAction::LookAround => {
-			io.print ("You are in a small room. In one corner is a TABLE. Obvious exits are a locked DOOR, and an EMERGENCY EXIT.");
+				just (line_response ("You are in a small room. In one corner is a TABLE. Obvious exits are a locked DOOR, and an EMERGENCY EXIT."))
 			}
 			PlayerAction::Look (item_name) => {
 				match item_name {
 					ItemName::Door => {
-					io.print ("You examine the DOOR. It is firmly locked, and you don't have any lock-picking tools. On the DOOR is an electronic KEYPAD.");
+						self.room_1.detected_keypad = true;
-					state.room_1.detected_keypad = true;
+						just (line_response ("You examine the DOOR. It is firmly locked, and you don't have any lock-picking tools. On the DOOR is an electronic KEYPAD."))
 					},
 					ItemName::EmergencyExit => {
-					io.print ("The EMERGENCY EXIT reads, \"Emergency exit. Push bar to open. Alarm will sound. Door will unlock in 10 seconds.\". The EMERGENCY EXIT is period-accurate for an American Wal-Mart c. 2020 C.E.");
+						just (line_response ("The EMERGENCY EXIT reads, \"Emergency exit. Push bar to open. Alarm will sound. Door will unlock in 10 seconds.\". The EMERGENCY EXIT is period-accurate for an American Wal-Mart c. 2020 C.E."))
 					},
 					ItemName::Keypad => {
-					if ! state.room_1.detected_keypad {
+						if ! self.room_1.detected_keypad {
-						print_undetected_item (io);
+							return Ok (just (undetected_item ()));
-						return Ok (());
 						}
 						
-					io.print ("The DOOR is locked by an electronic KEYPAD. A soft amber power light indicates that the KEYPAD is likely functional. The KEYPAD buttons are the digits 0-9, Enter, and Clear. Experience tells you that the key code is likely 4 or 5 digits long.");	
+						just (line_response ("The DOOR is locked by an electronic KEYPAD. A soft amber power light indicates that the KEYPAD is likely functional. The KEYPAD buttons are the digits 0-9, Enter, and Clear. Experience tells you that the key code is likely 4 or 5 digits long."))
 					},
 					ItemName::Note => {
-					if ! state.room_1.detected_note {
+						if ! self.room_1.detected_note {
-						print_undetected_item (io);
+							return Ok (vec! [
-						return Ok (());
+								undetected_item (),
+							]);
 						}
 						
-					io.print_many ([
+						just (Response::PrintMany (vec! [
 							"You pick up the NOTE and read it.",
 							"",
 							"Welcome to SEROTONIN DEPOSITORY.",
@@ -280,76 +267,138 @@ fn room_1 <I: Io> (io: &mut I, state: &mut State) -> Result <()> {
 							"    -- Phayle Sayf",
 							"",
 							"You notice that the NOTE is _not_ period-accurate.",
-					])
+						]))
 					},
 					ItemName::Table => {
-					io.print ("You look at the TABLE. Your instincts tell you that it is period-accurate. Upon the TABLE sits a NOTE.");
+						self.room_1.detected_note = true;
-					state.room_1.detected_note = true;
+						vec! [
+							Response::Print ("You look at the TABLE. Your instincts tell you that it is period-accurate. Upon the TABLE sits a NOTE.".into ()),
+						]
 					},
 					_ => {
-					print_undetected_item (io);
+						vec! [
+							undetected_item (),
+						]
 					},
 				}
 			},
 			PlayerAction::Use (item_name) => {
 				match item_name {
 					ItemName::Door => {
-					io.print ("You can't USE the DOOR, it is locked.");
+						let mut output = vec! [
-					if ! state.room_1.detected_keypad {
+							line_response ("You can't USE the DOOR, it is locked."),
-						io.print ("You notice an electronic KEYPAD on the DOOR.");
+						];
-						state.room_1.detected_keypad = true;
+						
+						if ! self.room_1.detected_keypad {
+							self.room_1.detected_keypad = true;
+							output.push (Response::Print ("You notice an electronic KEYPAD on the DOOR.".into ()));
 						}
+						
+						output
 					},
 					ItemName::EmergencyExit => {
-					io.print ("You push on the emergency exit. An alarm starts sounding. Your ADVENTURE GAME ENTHUSIAST friend is going to be very mad at you.");
+						vec! [
-					io.sleep (5000);
+							Response::Print ("You push on the emergency exit. An alarm starts sounding. Your ADVENTURE GAME ENTHUSIAST friend is going to be very mad at you.".into ()),
-					io.print ("The alarm is still sounding. You are getting embarrassed, but you have committed to this path of action.");
+							Response::Sleep (5000),
-					io.sleep (5000);
+							Response::Print ("The alarm is still sounding. You are getting embarrassed, but you have committed to this path of action.".into ()),
-					io.print ("The emergency exit unlocks, and you walk out of the game. Bye.");
+							Response::Sleep (5000),
-					state.quitting = true;
+							Response::Print ("The emergency exit unlocks, and you walk out of the game. Bye.".into ()),
+							Response::JokeEnding,
+							Response::Quit,
+						]
 					},
 					_ => {
-					print_undetected_item (io);
+						vec! [
+							undetected_item (),
+						]
 					},
 				}
 			},
+		})
+	}
+}
+
+fn game () -> Result <()> {
+	for line in [
+		"Welcome to SEROTONIN DEPOSITORY, the only adventure game ever made.",
+		"",
+		"You have been consensually kidnapped by a diabolical ADVENTURE GAME ENTHUSIAST and encouraged to solve PUZZLES for their sick PLEASURE. The only winning move is to solve all the PUZZLES.",
+		"",
+		"Press ENTER if you dare to begin.",
+	] {
+		print (line);
+	}
+	
+	let input = read_input ()?;
+	
+	if ! input.is_empty () {
+		print ("That was more than just ENTER but OKAY, overachiever.");
+	}
+	
+	print ("");
+	
+	let mut state = State::default ();
+	
+	print ("You are in a small room. In one corner is a TABLE.");
+	
+	'main_loop: loop {
+		let input = read_input ()?;
+		let responses = state.room_1 (input)?;
+		
+		for response in responses.into_iter () {
+			match response {
+				Response::Print (line) => print (&line),
+				Response::PrintMany (lines) => {
+					for line in lines {
+						print (line);
+					}
+				},
+				Response::Sleep (x) => std::thread::sleep (std::time::Duration::from_millis (x.into ())),
+				Response::Quit => break 'main_loop,
+				_ => (),
+			}
+		}
 	}
 	
 	Ok (())
 }
 
 fn main () -> Result <()> {
-	let mut io = Stdio::default ();
+	game ()?;
-	
-	io.print_many ([
-		"Welcome to SEROTONIN DEPOSITORY, the only adventure game ever made.",
-		"",
-		"You have been consensually kidnapped by a diabolical ADVENTURE GAME ENTHUSIAST and encouraged to solve PUZZLES for their sick PLEASURE. The only winning move is to solve all the PUZZLES.",
-		"",
-		"Press ENTER if you dare to begin.",
-	]);
-	
-	let input = io.read_input ()?;
-	
-	if ! input.is_empty () {
-		io.print ("That was more than just ENTER but OKAY, overachiever.");
-	}
-	
-	io.print ("");
-	
-	let mut state = State::default ();
-	
-	io.print ("You are in a small room. In one corner is a TABLE.");
-	
-	while ! state.quitting {
-		room_1 (&mut io, &mut state)?;
-	}
 	
 	Ok (())
 }
 
 #[cfg (test)]
 mod test {
+	use super::{
+		Io,
+		GameError,
+		Result,
+		State,
+	};
+	
+	struct TestIo {
+		inputs: Vec <String>,
+		input_idx: usize,
+	}
+	
+	impl Io for TestIo {
+		fn print (&mut self, _s: &str) {}
+		
+		fn read_input (&mut self) -> Result <String> {
+			if self.input_idx >= self.inputs.len () {
+				return Err (GameError::IoError);
+			}
+			
+			let s = self.inputs [self.input_idx].clone ();
+			self.input_idx += 1;
+			Ok (s)
+		}
+		
+		fn sleep (&mut self, _milliseconds: u32) {}
+	}
+	
 	#[test]
 	fn parse_input () {
 		use super::{
@@ -371,4 +420,9 @@ mod test {
 			assert_eq! (actual, expected);
 		}
 	}
+	
+	#[test]
+	fn joke_ending () {
+		
+	}
 }