From 107ff1e79477d899b7cfdb3dcf3b9205451270eb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Julien=20Valverd=C3=A9?= <julien.valverde@mailo.com>
Date: Fri, 25 Apr 2025 08:12:34 +0200
Subject: [PATCH] SubscriptionSubRef.makeFromPath

---
 packages/reffuse/src/types/SubscriptionSubRef.ts | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/packages/reffuse/src/types/SubscriptionSubRef.ts b/packages/reffuse/src/types/SubscriptionSubRef.ts
index b9cb31f..6567c55 100644
--- a/packages/reffuse/src/types/SubscriptionSubRef.ts
+++ b/packages/reffuse/src/types/SubscriptionSubRef.ts
@@ -1,4 +1,5 @@
-import { Effect, Effectable, Readable, Ref, Stream, Subscribable, SubscriptionRef, SynchronizedRef, type Types, type Unify } from "effect"
+import { Effect, Effectable, Option, Readable, Ref, Stream, Subscribable, SubscriptionRef, SynchronizedRef, type Types, type Unify } from "effect"
+import * as PropertyPath from "./PropertyPath.js"
 
 
 export const SubscriptionSubRefTypeId: unique symbol = Symbol.for("reffuse/types/SubscriptionSubRef")
@@ -87,3 +88,12 @@ export const makeFromGetSet = <A, B>(
     getter: (parentValue: B) => A,
     setter: (parentValue: B, value: A) => B,
 ): SubscriptionSubRef<A, B> => new SubscriptionSubRefImpl(parent, getter, setter)
+
+export const makeFromPath = <B, const P extends PropertyPath.Paths<B>>(
+    parent: SubscriptionRef.SubscriptionRef<B>,
+    path: P,
+): SubscriptionSubRef<PropertyPath.ValueFromPath<B, P>, B> => new SubscriptionSubRefImpl(
+    parent,
+    parentValue => PropertyPath.unsafeGet(parentValue, path),
+    (parentValue, value) => Option.getOrThrow(PropertyPath.immutableSet(parentValue, path, value)),
+)