freecell 0.1.0

Game objects and rules for the solitaire card game FreeCell
Documentation 
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use arrayvec::ArrayVec;

use crate::{Card, CardCollection};

/// May hold up to four arbitrary cards
// TODO [med/low priority] consider a different type for this, e.g. one where order doesn't matter
pub type Freecells = ArrayVec<[Card; 4]>;

impl CardCollection for Freecells {
    fn add_card(&self, card: Card) -> Result<Self, ()> {
        if self.is_full() {
            return Err(());
        }

        let mut clone = self.clone();
        clone.push(card);
        Ok(clone)
    }

    fn pop_card(&self) -> Vec<(Self, Card)> {
        let mut results = Vec::new();

        // for each card, return a result where this card has been removed
        for i in 0..self.len() {
            let mut clone = self.clone();
            let card = clone.swap_remove(i);
            results.push((clone, card))
        }

        results
    }
}