Add filtering support in the backend

src/main.rs

@@ -5,6 +5,7 @@ mod tasks;
 mod users;
 
 use axum::extract::Extension;
+use axum::extract::Query;
 use axum::http::StatusCode;
 use axum::response::Html;
 use axum::response::IntoResponse;
@@ -234,10 +235,16 @@ macro_rules! assert_or {
     };
 }
 
+#[derive(Deserialize)]
+struct FilterParam {
+    filter: Option<u8>,
+}
+
 async fn homepage(
     session: ReadableSession,
     Extension(tera): Extension<Arc<Tera>>,
     Extension(pool): Extension<Arc<Pool<Postgres>>>,
+    Query(FilterParam { filter }): Query<FilterParam>,
 ) -> Result<Html<String>, Error> {
     let username = login_or_redirect!(session, "/login");
 
@@ -248,13 +255,19 @@ async fn homepage(
         .await?;
 
     info!("Getting tasks");
-    let tasks: Vec<RawTask> =
+    let mut tasks: Vec<RawTask> =
         sqlx::query_as("select id,title,description,status from tasks where owner=$1")
             .bind(id)
             .fetch_all(&*pool)
             .await?;
 
-    info!("Sorting tasks");
+    info!("Sorting and filtering tasks");
+    // TODO: refactor this when let_chains is finally stable
+    if let Some(filter) = filter {
+        if filter != 0 {
+            tasks.retain(|rt| rt.status == (filter as i32) - 1);
+        }
+    }
     let mut tasks: Vec<Task> = tasks.into_iter().map(Task::from).collect();
     tasks.sort_unstable();
     tasks.reverse();
@@ -263,7 +276,8 @@ async fn homepage(
     let rendered = tera.render(
         "home.html",
         &ctx! {
-            "tasks" => tasks
+            "tasks" => tasks,
+            "filter" => filter.unwrap_or(255) // placeholder that won't match anything
         },
     )?;