Use Gradle's ConsoleRenderer

src/main/kotlin/com/jaredsburrows/spoon/ConsoleRenderer.kt

@@ -0,0 +1,70 @@
+package com.jaredsburrows.spoon
+
+import org.gradle.api.UncheckedIOException
+import java.io.File
+import java.io.IOException
+import java.net.URI
+import java.net.URISyntaxException
+
+/**
+ * Renders information in a format suitable for logging to the console.
+ *
+ * Taken from: https://github.com/gradle/gradle/blob/master/subprojects/logging/src/main/java/org/gradle/internal/logging/ConsoleRenderer.java
+ */
+class ConsoleRenderer {
+  /**
+   * Renders a path name as a file URL that is likely recognized by consoles.
+   */
+  fun asClickableFileUrl(path: File): String {
+    // File.toURI().toString() leads to an URL like this on Mac: file:/reports/index.html
+    // This URL is not recognized by the Mac console (too few leading slashes). We solve
+    // this be creating an URI with an empty authority.
+    try {
+      return URI("file", "", path.toURI().path, null, null).toString()
+    } catch (e: URISyntaxException) {
+      throw UncheckedException.throwAsUncheckedException(e)
+    }
+  }
+}
+
+/**
+ * Wraps a checked exception. Carries no other context.
+ *
+ * Taken from: https://github.com/gradle/gradle/blob/master/subprojects/base-services/src/main/java/org/gradle/internal/UncheckedException.java
+ */
+class UncheckedException : RuntimeException {
+  constructor(cause: Throwable) : super(cause)
+  constructor(message: String, cause: Throwable) : super(message, cause)
+
+  companion object {
+    /**
+     * Note: always throws the failure in some form. The return value is to keep the compiler happy.
+     */
+    @JvmOverloads fun throwAsUncheckedException(
+      t: Throwable,
+      preserveMessage: Boolean = false
+    ): RuntimeException {
+      if (t is RuntimeException) {
+        throw t
+      }
+
+      if (t is Error) {
+        throw t
+      }
+
+      if (t is IOException) {
+        if (preserveMessage) {
+          throw UncheckedIOException(t.message.orEmpty(), t)
+        } else {
+          throw UncheckedIOException(t)
+        }
+      }
+
+      if (preserveMessage) {
+        throw UncheckedException(t.message.orEmpty(), t)
+      } else {
+        throw UncheckedException(t)
+      }
+    }
+  }
+}

src/main/kotlin/com/jaredsburrows/spoon/SpoonTask.kt

@@ -6,7 +6,6 @@ import org.gradle.api.DefaultTask
 import org.gradle.api.GradleException
 import org.gradle.api.tasks.TaskAction
 import java.io.File
-import java.net.URI
 import java.time.Duration
 
 open class SpoonTask : DefaultTask() {
@@ -109,9 +108,7 @@ open class SpoonTask : DefaultTask() {
 
     val success = if (testing) testValue else builder.build().run()
     if (!success && !extension.ignoreFailures) {
-      throw GradleException("Tests failed! See ${getClickableFileUrl(outputDir, "index.html")}")
+      throw GradleException("Tests failed! See ${ConsoleRenderer().asClickableFileUrl(File(outputDir, "index.html"))}")
     }
   }
-
-  private fun getClickableFileUrl(path: File, fileName: String): String = URI("file", "", File(path.toURI().path, fileName).path, null, null).toString()
 }