don’t throw from main in UnidocBuild

Author: tayloraswift

Sources/System/SystemProcess.swift

@@ -1,6 +1,6 @@
-#if os(Linux)
+#if canImport(Glibc)
 import Glibc
-#elseif os(macOS)
+#elseif canImport(Darwin)
 import Darwin
 #else
 #error("unsupported platform")
@@ -115,3 +115,20 @@ extension SystemProcess
         }
     }
 }
+extension SystemProcess
+{
+    @MainActor
+    public static
+    func `do`(_ operation:() async throws -> Void) async
+    {
+        do
+        {
+            try await operation()
+        }
+        catch let error
+        {
+            print(error)
+            exit(1)
+        }
+    }
+}

Sources/UnidocBuild/Main.swift

@@ -9,7 +9,13 @@ import UnidocAPI
 enum Main
 {
     static
-    func main() async throws
+    func main() async
+    {
+        await SystemProcess.do(Self._main)
+    }
+
+    private static
+    func _main() async throws
     {
         let options:Options = try .parse()