Merge pull request #6 from SavchenkoValeriy/feat/support-for-other-swift-versions

Require Swift 5.6 only for DoCC

Author: SavchenkoValeriy

Package.swift

@@ -1,13 +1,12 @@
-// swift-tools-version:5.6
+// swift-tools-version:5.2
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
 
 let package = Package(
   name: "EmacsSwiftModule",
-  platforms: [.macOS(.v11)],
+  platforms: [.macOS(.v10_15)],
   products: [
-    // Products define the executables and libraries a package produces, and make them visible to other packages.
     .library(
       name: "EmacsSwiftModule",
       targets: ["EmacsSwiftModule"]),
@@ -16,14 +15,8 @@ let package = Package(
       type: .dynamic,
       targets: ["TestModule"]),
   ],
-  dependencies: [
-    // Dependencies declare other packages that this package depends on.
-    // .package(url: /* package url */, from: "1.0.0"),
-    .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0")
-  ],
+  dependencies: [],
   targets: [
-    // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-    // Targets can depend on other targets in this package, and on products in packages this package depends on.
     .target(
       name: "EmacsSwiftModule",
       dependencies: ["EmacsModule"],
@@ -42,3 +35,9 @@ let package = Package(
     ),
   ]
 )
+
+#if swift(>=5.6)
+  package.dependencies.append(
+    .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0")
+  )
+#endif

Source/Swift/Channel.swift

@@ -140,7 +140,11 @@ public class Channel {
 
     if let data = "\(index)\n".data(using: String.Encoding.utf8) {
       do {
-        try pipe?.write(contentsOf: data)
+        if #available(macOS 10.15.4, *) {
+          try pipe?.write(contentsOf: data)
+        } else {
+          pipe?.write(data)
+        }
       } catch {
         fatalError("Error writing to a pipe")
       }