From 1a42804b2df0c443588863e77c1c4c619a33533b Mon Sep 17 00:00:00 2001
From: metamuffin <metamuffin@disroot.org>
Date: Sun, 1 Oct 2023 21:30:09 +0200
Subject: ovar wait_for

---
 src/observable.ts | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

(limited to 'src/observable.ts')

diff --git a/src/observable.ts b/src/observable.ts
index f00b845..15a1a2e 100644
--- a/src/observable.ts
+++ b/src/observable.ts
@@ -12,10 +12,8 @@ export class OVar<T> {
     }
 
     get value() { return this._value }
-    set value(v: T) {
-        this._value = v;
-        this.observers.forEach(o => o(v))
-    }
+    set value(v: T) { this._value = v; this.change() }
+    change() { this.observers.forEach(o => o(this._value)) }
 
     onchange(handler: (v: T) => unknown): () => void {
         this.observers.push(handler)
@@ -31,4 +29,14 @@ export class OVar<T> {
         this.onchange(v => uv.value = fn(v))
         return uv;
     }
+    wait_for(val: T) {
+        return new Promise<void>(r => {
+            const abort = this.onchangeinit(v => {
+                if (v == val) {
+                    r()
+                    abort()
+                }
+            })
+        })
+    }
 }
-- 
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