First levels v0.1.0

src/progress.rs

@@ -0,0 +1,38 @@
+//! Player progress saved to `./.gameplay/state.yaml`.
+
+use anyhow::Result;
+use serde::{Deserialize, Serialize};
+use std::path::PathBuf;
+
+use crate::levels::Difficulty;
+
+#[derive(Default, Serialize, Deserialize)]
+pub struct Progress {
+    pub tier: Option<Difficulty>,
+    pub completed: Vec<u8>,
+    pub current_level: u8,
+    pub current_seed: u64,
+    pub attempts: u32,
+}
+
+pub fn save_path() -> PathBuf {
+    PathBuf::from(".gameplay/state.yaml")
+}
+
+pub fn load() -> Result<Progress> {
+    let path = save_path();
+    if !path.exists() {
+        return Ok(Progress::default());
+    }
+    Ok(serde_yaml::from_str(&std::fs::read_to_string(&path)?)?)
+}
+
+pub fn save(progress: &Progress) -> Result<()> {
+    let path = save_path();
+    // First-run safeguard: `.gameplay/` won't exist yet.
+    if let Some(dir) = path.parent() {
+        std::fs::create_dir_all(dir)?;
+    }
+    std::fs::write(&path, serde_yaml::to_string(progress)?)?;
+    Ok(())
+}