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use super::*; pub struct AutoSave<T: Serialize> { value: T, path: String, changed: Cell<bool>, } impl<T: Serialize + for<'de> Deserialize<'de> + Default> AutoSave<T> { pub fn load(path: &str) -> Self { Self { value: load(path).unwrap_or_else(|| { let value = default(); save(path, &value); value }), path: path.to_owned(), changed: Cell::new(false), } } } impl<T: Serialize> AutoSave<T> { pub fn save(&self) { save(&self.path, &self.value); } } impl<T: Serialize> Deref for AutoSave<T> { type Target = T; fn deref(&self) -> &T { if self.changed.get() { self.changed.set(false); self.save(); } &self.value } } impl<T: Serialize> DerefMut for AutoSave<T> { fn deref_mut(&mut self) -> &mut T { self.changed.set(true); &mut self.value } } impl<T: Serialize> Drop for AutoSave<T> { fn drop(&mut self) { self.save(); } } fn save<T: Serialize>(path: &str, value: &T) { #[cfg(target_arch = "wasm32")] { if let Ok(Some(storage)) = web_sys::window().unwrap().local_storage() { storage.set_item( path, &serde_json::to_string(value).expect("Failed to serialize"), ); } } #[cfg(not(target_arch = "wasm32"))] { let mut file = match std::fs::File::create(path) { Ok(file) => file, Err(e) => { error!("Failed to create {:?}: {}", path, e); return; } }; if let Err(e) = file.write_all( ron::ser::to_string_pretty(value, default()) .unwrap() .as_bytes(), ) { error!("Failed to save {:?}: {}", path, e); } } } fn load<T: for<'de> Deserialize<'de>>(path: &str) -> Option<T> { #[cfg(target_arch = "wasm32")] { if let Ok(Some(storage)) = web_sys::window().unwrap().local_storage() { match storage .get_item(path) .ok() .flatten() .map(|s| serde_json::from_str(&s)) { Some(Ok(value)) => Some(value), Some(Err(e)) => { error!("Failed to deserialize {:?}: {}", path, e); None } None => None, } } else { None } } #[cfg(not(target_arch = "wasm32"))] { let file = match std::fs::File::open(path) { Ok(file) => file, Err(e) => { warn!("Failed to open {:?}: {}", path, e); return None; } }; match ron::de::from_reader(file) { Ok(value) => { info!("Successfully loaded {:?}", path); Some(value) } Err(e) => { error!("Failed to deserialize {:?}: {}", path, e); None } } } }