feat: add basic errors

src/lib.rs

@@ -19,9 +19,14 @@ impl App {
         Self::default()
     }
 
-    pub fn add(&mut self, item: Item) {
+    pub fn add(&mut self, item: Item) -> Result<()> {
         self.logs.push(item);
-        let _ = self.save();
+        self.save()
+    }
+
+    pub fn remove<T: AsRef<str>>(&mut self, id: T) -> Result<()> {
+        self.logs.retain(|i| i.id() != id.as_ref());
+        self.save()
     }
 
     pub fn save(&self) -> Result<()> {

src/main.rs

@@ -1,8 +1,15 @@
-use lw::App;
+use std::error::Error;
 
-fn main() {
+use lw::{App, log::Item};
+
+fn main() -> Result<(), Box<dyn Error>> {
     let mut app = App::default();
-    app.add("hello_world".into());
-    app.save().unwrap();
+    let item = Item::from("hello_world");
+    let id = item.id();
+    app.add(item)?;
     println!("{app:?}");
+    app.remove(id)?;
+    app.save()?;
+    println!("{app:?}");
+    Ok(())
 }