Make public is_passing and ReferendumStatus (#12667)

* init

* clean

* remove manual getter for ReferendumStatus in favor of changing pub crate to pub for ReferendumStatus DecidingStatus Deposit types

* rm status getters because fields are pub now

substrate/frame/referenda/src/lib.rs

@@ -701,6 +701,31 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 		}
 	}
 
+	/// Returns whether the referendum is passing.
+	/// Referendum must be ongoing and its track must exist.
+	pub fn is_referendum_passing(ref_index: ReferendumIndex) -> Result<bool, DispatchError> {
+		let info = ReferendumInfoFor::<T, I>::get(ref_index).ok_or(Error::<T, I>::BadReferendum)?;
+		match info {
+			ReferendumInfo::Ongoing(status) => {
+				let track = Self::track(status.track).ok_or(Error::<T, I>::NoTrack)?;
+				let elapsed = if let Some(deciding) = status.deciding {
+					frame_system::Pallet::<T>::block_number().saturating_sub(deciding.since)
+				} else {
+					Zero::zero()
+				};
+				Ok(Self::is_passing(
+					&status.tally,
+					elapsed,
+					track.decision_period,
+					&track.min_support,
+					&track.min_approval,
+					status.track,
+				))
+			},
+			_ => Err(Error::<T, I>::NotOngoing.into()),
+		}
+	}
+
 	// Enqueue a proposal from a referendum which has presumably passed.
 	fn schedule_enactment(
 		index: ReferendumIndex,