Initial

Package.resolved

@@ -0,0 +1,113 @@
+{
+  "pins" : [
+    {
+      "identity" : "combine-schedulers",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/combine-schedulers",
+      "state" : {
+        "revision" : "9dc9cbe4bc45c65164fa653a563d8d8db61b09bb",
+        "version" : "1.0.0"
+      }
+    },
+    {
+      "identity" : "swift-case-paths",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swift-case-paths",
+      "state" : {
+        "revision" : "bba1111185863c9288c5f047770f421c3b7793a4",
+        "version" : "1.1.3"
+      }
+    },
+    {
+      "identity" : "swift-clocks",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swift-clocks",
+      "state" : {
+        "revision" : "a8421d68068d8f45fbceb418fbf22c5dad4afd33",
+        "version" : "1.0.2"
+      }
+    },
+    {
+      "identity" : "swift-collections",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-collections",
+      "state" : {
+        "revision" : "a902f1823a7ff3c9ab2fba0f992396b948eda307",
+        "version" : "1.0.5"
+      }
+    },
+    {
+      "identity" : "swift-composable-architecture",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swift-composable-architecture",
+      "state" : {
+        "revision" : "cb9c1f845b3b981da787452beee893826210eb7a",
+        "version" : "1.5.5"
+      }
+    },
+    {
+      "identity" : "swift-concurrency-extras",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swift-concurrency-extras",
+      "state" : {
+        "revision" : "bb5059bde9022d69ac516803f4f227d8ac967f71",
+        "version" : "1.1.0"
+      }
+    },
+    {
+      "identity" : "swift-custom-dump",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swift-custom-dump",
+      "state" : {
+        "revision" : "aedcf6f4cd486ccef5b312ccac85d4b3f6e58605",
+        "version" : "1.1.2"
+      }
+    },
+    {
+      "identity" : "swift-dependencies",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swift-dependencies",
+      "state" : {
+        "revision" : "101ba87f8de2cb7a80e0c0551370f6981a03022a",
+        "version" : "1.1.4"
+      }
+    },
+    {
+      "identity" : "swift-identified-collections",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swift-identified-collections",
+      "state" : {
+        "revision" : "d1e45f3e1eee2c9193f5369fa9d70a6ddad635e8",
+        "version" : "1.0.0"
+      }
+    },
+    {
+      "identity" : "swift-syntax",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-syntax",
+      "state" : {
+        "revision" : "6ad4ea24b01559dde0773e3d091f1b9e36175036",
+        "version" : "509.0.2"
+      }
+    },
+    {
+      "identity" : "swiftui-navigation",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/swiftui-navigation",
+      "state" : {
+        "revision" : "78f9d72cf667adb47e2040aa373185c88c63f0dc",
+        "version" : "1.2.0"
+      }
+    },
+    {
+      "identity" : "xctest-dynamic-overlay",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/pointfreeco/xctest-dynamic-overlay",
+      "state" : {
+        "revision" : "23cbf2294e350076ea4dbd7d5d047c1e76b03631",
+        "version" : "1.0.2"
+      }
+    }
+  ],
+  "version" : 2
+}

Package.swift

@@ -5,19 +5,24 @@ import PackageDescription
 
 let package = Package(
 	name: "swift-composable-subscriber",
+	platforms: [
+		.iOS(.v13),
+		.macOS(.v10_15),
+		.tvOS(.v13),
+		.watchOS(.v6),
+	],
 	products: [
-        // Products define the executables and libraries a package produces, making them visible to other packages.
-        .library(
-            name: "swift-composable-subscriber",
-            targets: ["swift-composable-subscriber"]),
+		.library(name: "ComposableSubscriber", targets: ["ComposableSubscriber"]),
+	],
+	dependencies: [
+		.package(url: "https://github.com/pointfreeco/swift-composable-architecture", .upToNextMajor(from: "1.0.0")),
 	],
 	targets: [
-        // Targets are the basic building blocks of a package, defining a module or a test suite.
-        // Targets can depend on other targets in this package and products from dependencies.
 		.target(
-            name: "swift-composable-subscriber"),
-        .testTarget(
-            name: "swift-composable-subscriberTests",
-            dependencies: ["swift-composable-subscriber"]),
+			name: "ComposableSubscriber",
+			dependencies: [
+				.product(name: "ComposableArchitecture", package: "swift-composable-architecture"),
+			]
+		),
 	]
 )

Sources/ComposableSubscriber/SubscriberReducer.swift

@@ -0,0 +1,59 @@
+import ComposableArchitecture
+
+extension Reducer {
+	func subscribe<TriggerAction, T>(
+		on triggerAction: CaseKeyPath<Action, TriggerAction>,
+		to stream: @escaping () async throws -> AsyncStream<T>,
+		with responseAction: CaseKeyPath<Action, T>
+	) -> _SubscribeReducer<Self, TriggerAction, T> {
+		.init(
+			parent: self,
+			on: triggerAction,
+			to: stream,
+			with: responseAction
+		)
+	}
+}
+
+struct _SubscribeReducer<Parent: Reducer, TriggerAction, T>: Reducer {
+	@usableFromInline
+	let parent: Parent
+
+	@usableFromInline
+	let triggerAction: AnyCasePath<Parent.Action, TriggerAction>
+
+	@usableFromInline
+	let stream: () async throws -> AsyncStream<T>
+
+	@usableFromInline
+	let responseAction: AnyCasePath<Parent.Action, T>
+
+	init(
+		parent: Parent,
+		on triggerAction: CaseKeyPath<Parent.Action, TriggerAction>,
+		to stream: @escaping () async throws -> AsyncStream<T>,
+		with responseAction: CaseKeyPath<Parent.Action, T>
+	) {
+		self.parent = parent
+		self.triggerAction = AnyCasePath(triggerAction)
+		self.stream = stream
+		self.responseAction = AnyCasePath(responseAction)
+	}
+
+	func reduce(into state: inout Parent.State, action: Parent.Action) -> Effect<Parent.Action> {
+		let effects = parent.reduce(into: &state, action: action)
+
+		guard self.triggerAction.extract(from: action) != nil else {
+			return effects
+		}
+
+		return .merge(
+			effects,
+			.run { send in
+				for await value in try await stream() {
+					await send(responseAction.embed(value))
+				}
+			}
+		)
+	}
+}

Sources/swift-composable-subscriber/swift_composable_subscriber.swift

@@ -1,2 +0,0 @@
-// The Swift Programming Language
-// https://docs.swift.org/swift-book