feat: make the web version fully working (#67)

Reviewed-on: #67

crates/common/Cargo.toml

@@ -16,3 +16,7 @@ futures.workspace = true
 
 dirs = "5.0"
 regex = "1.10"
+anyhow.workspace = true
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+web-sys = { version = "0.3", features = ["Window", "Storage"] }

crates/common/src/lib.rs

@@ -1,13 +1,16 @@
-pub use debounced_delay::*;
-pub use display::*;
-pub use event::*;
-pub use media_extractor::*;
-pub use parser::*;
-pub use paths::*;
-
 mod debounced_delay;
 mod display;
 mod event;
 mod media_extractor;
 mod parser;
 mod paths;
+
+#[cfg(target_arch = "wasm32")]
+pub mod web_store;
+
+pub use debounced_delay::*;
+pub use display::*;
+pub use event::*;
+pub use media_extractor::*;
+pub use parser::*;
+pub use paths::*;

crates/common/src/web_store.rs

@@ -0,0 +1,32 @@
+use anyhow::{Error, anyhow};
+
+const LOCAL_STORAGE: &str = "localStorage";
+
+fn storage() -> Result<web_sys::Storage, Error> {
+    web_sys::window()
+        .ok_or_else(|| anyhow!("no browser window"))?
+        .local_storage()
+        .map_err(|e| anyhow!("{LOCAL_STORAGE} unavailable: {e:?}"))?
+        .ok_or_else(|| anyhow!("{LOCAL_STORAGE} unavailable"))
+}
+
+/// Read a value previously written with [`set`]
+pub fn get(key: &str) -> Result<Option<String>, Error> {
+    storage()?
+        .get_item(key)
+        .map_err(|e| anyhow!("{LOCAL_STORAGE} read failed: {e:?}"))
+}
+
+/// Write a value, replacing any previous one
+pub fn set(key: &str, value: &str) -> Result<(), Error> {
+    storage()?
+        .set_item(key, value)
+        .map_err(|e| anyhow!("{LOCAL_STORAGE} write failed: {e:?}"))
+}
+
+/// Remove a value if it exists
+pub fn remove(key: &str) -> Result<(), Error> {
+    storage()?
+        .remove_item(key)
+        .map_err(|e| anyhow!("{LOCAL_STORAGE} delete failed: {e:?}"))
+}