add push rule hook

src/app/hooks/usePushRule.ts

@@ -0,0 +1,44 @@
+import { IPushRule, IPushRules, PushRuleKind, RuleId } from 'matrix-js-sdk';
+import { useMemo } from 'react';
+
+export type PushRuleData = {
+  kind: PushRuleKind;
+  pushRule: IPushRule;
+};
+
+export const orderedPushRuleKinds: PushRuleKind[] = [
+  PushRuleKind.Override,
+  PushRuleKind.ContentSpecific,
+  PushRuleKind.RoomSpecific,
+  PushRuleKind.SenderSpecific,
+  PushRuleKind.Underride,
+];
+
+export const getPushRule = (
+  pushRules: IPushRules,
+  ruleId: RuleId | string
+): PushRuleData | undefined => {
+  const { global } = pushRules;
+
+  let ruleData: PushRuleData | undefined;
+
+  orderedPushRuleKinds.some((kind) => {
+    const rules = global[kind];
+    const pushRule = rules?.find((r) => r.rule_id === ruleId);
+    if (pushRule) {
+      ruleData = {
+        kind,
+        pushRule,
+      };
+      return true;
+    }
+    return false;
+  });
+
+  return ruleData;
+};
+
+export const usePushRule = (
+  pushRules: IPushRules,
+  ruleId: RuleId | string
+): PushRuleData | undefined => useMemo(() => getPushRule(pushRules, ruleId), [pushRules, ruleId]);