format

This reverts commit 5a52f2ab7a.

card_game/src/lib.rs

@@ -321,18 +321,29 @@ impl<S> SessionStats<S> {
 	}
 }
 
-pub struct Session<G: Game> {
+#[derive(Clone)]
+pub struct Session<G: Game>
+where
+	G::Config: Clone,
+	G::Instruction: Clone,
+{
 	stats: SessionStats<G::Stats>,
 	config: G::Config,
 	state: SessionState<G>,
 }
 #[derive(Clone, Eq, Hash, PartialEq)]
-pub struct SessionState<G: Game> {
+pub struct SessionState<G: Game>
+where
+	G::Instruction: Clone,
+{
 	seed: G,
 	state: G,
 	history: Vec<G::Instruction>,
 }
-impl<G: Game + Clone> SessionState<G> {
+impl<G: Game + Clone> SessionState<G>
+where
+	G::Instruction: Clone,
+{
 	fn new(state: G) -> Self {
 		Self {
 			seed: state.clone(),
@@ -345,6 +356,7 @@ impl<G: Game> Session<G>
 where
 	G: Clone + Eq + core::hash::Hash,
 	G::Stats: Clone + Default,
+	G::Config: Clone,
 	G::Instruction: Clone + Eq + core::hash::Hash,
 {
 	pub fn new(state: G, config: G::Config) -> Self {
@@ -389,6 +401,30 @@ where
 	pub fn is_win(&self) -> bool {
 		self.state.is_win()
 	}
+	pub fn is_winnable(&self) -> Option<Vec<G::Instruction>> {
+		let mut state_moves = std::collections::HashMap::new();
+		let mut state = self.clone();
+		while !state.is_win() {
+			// Continue existing iterator if it exists
+			let it = state_moves
+				.entry(state.state().clone())
+				.or_insert_with(|| state.state().possible_instructions());
+
+			// Run one possible move
+			if let Some(instruction) = it.next() {
+				state.process_instruction(instruction);
+				continue;
+			}
+
+			// No more moves. If we can't undo we're done
+			if state.history().is_empty() {
+				return None;
+			} else {
+				state.undo();
+			}
+		}
+		Some(state.state.history)
+	}
 }
 impl<G: Game> Game for SessionState<G>
 where

klondike-cli/src/main.rs

@@ -4,8 +4,8 @@ use klondike::{
 	KlondikePile, KlondikePileStack, KlondikeStats, SkipCards, Tableau, TableauStack,
 };
 
-// #[cfg(test)]
-// mod test;
+#[cfg(test)]
+mod test;
 
 use std::fmt::Display;
 struct Displayed<T>(T);

klondike-cli/src/test.rs

@@ -1,5 +1,5 @@
-use klondike::Klondike;
 use card_game::Session;
+use klondike::Klondike;
 #[test]
 fn test_is_winnable() {
 	// is winnable