Support for non-Apple platforms (#27)

* Conditional import of Combine and SwiftUI

* Conditionally import swift ui

* Added #if canImport(os) to ReducerInstrumentation.swift

* More changes for supporting non-Apple platforms.

* Add CI job for Linux

* Added Linux test discovery

* Added LinuxMain.swift for testing

* Add back debugCaseOutput for Linux

* Exclude Identified and IdentifiedArray for Linux

* Exclude use of IdenfitiedArray for Linux

* Workaround for DipatchQueue is not Equatable in Linux

* Allow tests to build on Linux.

* Another attempt to limit tests on Linux

* Only include ComposableArchitecture for Android OS

Co-authored-by: Andrei Vidrasco <[email protected]>

Author: mluisbrown

.github/workflows/ci.yml

@@ -22,3 +22,27 @@ jobs:
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app
       - name: Run tests
         run: make test
+
+  swiftpm-linux:
+    name: SwiftPM Linux
+    runs-on: ubuntu-18.04
+    steps:
+      - name: Install Swift
+        run: |
+          eval "$(curl -sL https://swiftenv.fuller.li/install.sh)"
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Recover cached dependencies
+        uses: actions/cache@v1
+        id: dependency-cache
+        with:
+          path: .build
+          key: swiftpm-linux-${{ hashFiles('Package.resolved') }}
+      - name: Pull dependencies
+        if: steps.dependency-cache.outputs.cache-hit != 'true'
+        run: |
+          swift package resolve
+      - name: Test via SwiftPM
+        run: |
+          swift --version
+          swift test --enable-test-discovery

Package.swift

@@ -69,3 +69,8 @@ let package = Package(
     ),
   ]
 )
+
+#if os(Linux) || os(Android)
+package.products.removeAll(where: { $0.name != "ComposableArchitecture" })
+package.targets.removeAll(where: { $0.name != "ComposableArchitecture" && $0.name != "ComposableArchitectureTests" })
+#endif

Sources/ComposableArchitecture/Debugging/ReducerInstrumentation.swift

@@ -1,3 +1,4 @@
+#if canImport(os)
 import os.signpost
 
 extension Reducer {
@@ -82,6 +83,7 @@ extension Effect where Error == Never {
       })
   }
 }
+#endif
 
 func debugCaseOutput(_ value: Any) -> String {
   func debugCaseOutputHelp(_ value: Any) -> String {

Sources/ComposableArchitecture/Internal/Debug.swift

@@ -1,5 +1,10 @@
 import Foundation
 
+#if os(Linux) || os(Android)
+import let CDispatch.NSEC_PER_USEC
+import let CDispatch.NSEC_PER_SEC
+#endif
+
 func debugOutput(_ value: Any, indent: Int = 0) -> String {
   var visitedItems: Set<ObjectIdentifier> = []
 
@@ -173,6 +178,18 @@ private let dateFormatter: ISO8601DateFormatter = {
 }()
 
 extension DispatchQueue: CustomDebugOutputConvertible {
+#if os(Linux) || os(Android)
+  public var debugOutput: String {
+    switch self.label {
+    case "com.apple.main-thread": return "DispatchQueue.main"
+    case "com.apple.root.default-qos": return "DispatchQueue.global()"
+    case _ where self.label == "com.apple.root.\(self.qos.qosClass)-qos":
+      return "DispatchQueue.global(qos: .\(self.qos.qosClass))"
+    default:
+      return "DispatchQueue(label: \(self.label.debugDescription), qos: .\(self.qos.qosClass))"
+    }
+  }
+#else
   public var debugOutput: String {
     switch (self, self.label) {
     case (.main, _): return "DispatchQueue.main"
@@ -183,6 +200,7 @@ extension DispatchQueue: CustomDebugOutputConvertible {
       return "DispatchQueue(label: \(self.label.debugDescription), qos: .\(self.qos.qosClass))"
     }
   }
+#endif
 }
 
 extension Effect: CustomDebugOutputConvertible {

Sources/ComposableArchitecture/Internal/LocalizedStringKey.swift

@@ -1,3 +1,4 @@
+#if canImport(SwiftUI)
 import SwiftUI
 
 @available(iOS 13.0, macOS 10.15, macCatalyst 13, tvOS 13.0, watchOS 6.0, *)
@@ -29,3 +30,4 @@ extension LocalizedStringKey: CustomDebugOutputConvertible {
     self.formatted().debugDescription
   }
 }
+#endif

Sources/ComposableArchitecture/Internal/Locking.swift

@@ -1,5 +1,6 @@
 import Foundation
 
+#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
 extension UnsafeMutablePointer where Pointee == os_unfair_lock_s {
   @inlinable @discardableResult
   func sync<R>(_ work: () -> R) -> R {
@@ -8,6 +9,7 @@ extension UnsafeMutablePointer where Pointee == os_unfair_lock_s {
     return work()
   }
 }
+#endif
 
 extension NSRecursiveLock {
   @inlinable @discardableResult

Sources/ComposableArchitecture/Reducer.swift

@@ -406,6 +406,7 @@ public struct Reducer<State, Action, Environment> {
     }
   }
 
+#if canImport(SwiftUI)
   /// A version of `pullback` that transforms a reducer that works on an element into one that works
   /// on an identified array of elements.
   ///
@@ -487,7 +488,8 @@ public struct Reducer<State, Action, Environment> {
         .map { toLocalAction.embed((id, $0)) }
     }
   }
-
+#endif
+    
   /// A version of `pullback` that transforms a reducer that works on an element into one that works
   /// on a dictionary of element values.
   ///

Sources/ComposableArchitecture/SwiftUI/ActionSheet.swift

@@ -1,3 +1,4 @@
+#if canImport(SwiftUI)
 import SwiftUI
 
 /// A data type that describes the state of an action sheet that can be shown to the user. The
@@ -221,3 +222,4 @@ extension ActionSheetState {
     )
   }
 }
+#endif

Sources/ComposableArchitecture/SwiftUI/Alert.swift

@@ -1,3 +1,4 @@
+#if canImport(SwiftUI)
 import SwiftUI
 
 /// A data type that describes the state of an alert that can be shown to the user. The `Action`
@@ -298,3 +299,4 @@ extension AlertState {
     }
   }
 }
+#endif

Sources/ComposableArchitecture/SwiftUI/ForEachStore.swift

@@ -1,3 +1,4 @@
+#if canImport(SwiftUI)
 import SwiftUI
 
 /// A structure that computes views on demand from a store on a collection of data.
@@ -119,3 +120,4 @@ where Data: Collection, ID: Hashable, Content: View {
     self.content()
   }
 }
+#endif