Add lineSeparator to Filesystem

Author: lauzadis

runtime/runtime-core/api/runtime-core.api

@@ -2329,6 +2329,7 @@ public abstract interface class aws/smithy/kotlin/runtime/util/Filesystem {
 	public static final field Companion Laws/smithy/kotlin/runtime/util/Filesystem$Companion;
 	public abstract fun fileExists (Ljava/lang/String;)Z
 	public abstract fun getFilePathSeparator ()Ljava/lang/String;
+	public abstract fun getLineSeparator ()Ljava/lang/String;
 	public abstract fun readFileOrNull (Ljava/lang/String;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
 	public abstract fun writeFile (Ljava/lang/String;[BLkotlin/coroutines/Continuation;)Ljava/lang/Object;
 }
@@ -2338,6 +2339,10 @@ public final class aws/smithy/kotlin/runtime/util/Filesystem$Companion {
 	public static synthetic fun fromMap$default (Laws/smithy/kotlin/runtime/util/Filesystem$Companion;Ljava/util/Map;Ljava/lang/String;ILjava/lang/Object;)Laws/smithy/kotlin/runtime/util/Filesystem;
 }
 
+public final class aws/smithy/kotlin/runtime/util/Filesystem$DefaultImpls {
+	public static fun getLineSeparator (Laws/smithy/kotlin/runtime/util/Filesystem;)Ljava/lang/String;
+}
+
 public final class aws/smithy/kotlin/runtime/util/FlowUtilKt {
 	public static final fun mergeSequential ([Lkotlinx/coroutines/flow/Flow;)Lkotlinx/coroutines/flow/Flow;
 }
@@ -2406,6 +2411,10 @@ public final class aws/smithy/kotlin/runtime/util/PlatformProvider$Companion {
 	public final fun getSystem ()Laws/smithy/kotlin/runtime/util/PlatformProvider;
 }
 
+public final class aws/smithy/kotlin/runtime/util/PlatformProvider$DefaultImpls {
+	public static fun getLineSeparator (Laws/smithy/kotlin/runtime/util/PlatformProvider;)Ljava/lang/String;
+}
+
 public abstract interface class aws/smithy/kotlin/runtime/util/PropertyProvider {
 	public abstract fun getAllProperties ()Ljava/util/Map;
 	public abstract fun getProperty (Ljava/lang/String;)Ljava/lang/String;
@@ -2429,6 +2438,7 @@ public final class aws/smithy/kotlin/runtime/util/TestPlatformProvider : aws/smi
 	public fun getAllEnvVars ()Ljava/util/Map;
 	public fun getAllProperties ()Ljava/util/Map;
 	public fun getFilePathSeparator ()Ljava/lang/String;
+	public fun getLineSeparator ()Ljava/lang/String;
 	public fun getProperty (Ljava/lang/String;)Ljava/lang/String;
 	public fun getenv (Ljava/lang/String;)Ljava/lang/String;
 	public fun isAndroid ()Z

runtime/runtime-core/common/src/aws/smithy/kotlin/runtime/util/Filesystem.kt

@@ -16,6 +16,12 @@ public interface Filesystem {
      */
     public val filePathSeparator: String
 
+    /**
+     * The string which represents a line separator on this file system. For example, on Windows, this is CRLF.
+     */
+    public val lineSeparator: String
+        get() = "\n"
+
     /**
      * Read the contents of a file as a [String] or return null on any error.
      *

runtime/runtime-core/common/src/aws/smithy/kotlin/runtime/util/Platform.kt

@@ -36,6 +36,7 @@ public interface PlatformProvider :
 internal expect object SystemDefaultProvider : PlatformProvider {
     override fun osInfo(): OperatingSystem
     override val filePathSeparator: String
+    override val lineSeparator: String
     override fun fileExists(path: String): Boolean
     override fun getAllEnvVars(): Map<String, String>
     override fun getAllProperties(): Map<String, String>
@@ -50,6 +51,12 @@ internal expect object SystemDefaultProvider : PlatformProvider {
     override val isNative: Boolean
 }
 
+internal val OperatingSystem.lineSeparator: String
+    get() = when {
+        family == OsFamily.Windows -> "\r\n"
+        else -> "\n"
+    }
+
 public data class OperatingSystem(val family: OsFamily, val version: String?)
 
 public enum class OsFamily {

runtime/runtime-core/jvm/src/aws/smithy/kotlin/runtime/util/PlatformJVM.kt

@@ -71,6 +71,8 @@ internal actual object SystemDefaultProvider : PlatformProvider {
      * segment char is '/'.
      */
     actual override val filePathSeparator: String by lazy { File.separator }
+
+    actual override val lineSeparator: String by lazy { osInfo().lineSeparator }
 }
 
 private fun isAndroid(): Boolean = try {