feat: smart day string, terse refactor and use types properly, work on unimplemented commands lightly, util modules,

src/bot/utils.rs

@@ -0,0 +1,24 @@
+//! Bot command utilities.
+
+use crate::banner::{Course, Term};
+use crate::bot::Context;
+use crate::error::Result;
+use tracing::error;
+
+/// Gets a course by its CRN for the current term.
+pub async fn get_course_by_crn(ctx: &Context<'_>, crn: i32) -> Result<Course> {
+    let app_state = &ctx.data().app_state;
+
+    // Get current term dynamically
+    let current_term_status = Term::get_current();
+    let term = current_term_status.inner();
+
+    // Fetch live course data from Redis cache via AppState
+    app_state
+        .get_course_or_fetch(&term.to_string(), &crn.to_string())
+        .await
+        .map_err(|e| {
+            error!(%e, crn, "failed to fetch course data");
+            e
+        })
+}