Change file extension for snippets

Author: ileasile

jupyter-lib/kotlin-jupyter-api/src/main/kotlin/org/jetbrains/kotlin/jupyter/config/compilation.kt

@@ -26,7 +26,7 @@ fun getCompilationConfiguration(
     return ScriptCompilationConfiguration {
         hostConfiguration.update { it.withDefaultsFrom(defaultJvmScriptingHostConfiguration) }
         baseClass.put(KotlinType(ScriptTemplateWithDisplayHelpers::class))
-        fileExtension.put("jupyter.kts")
+        fileExtension.put("jupyter-kts")
 
         val classImports = listOf(
             DependsOn::class,

src/main/kotlin/org/jetbrains/kotlin/jupyter/repl.kt

@@ -44,6 +44,7 @@ import kotlin.script.experimental.api.asDiagnostics
 import kotlin.script.experimental.api.asSuccess
 import kotlin.script.experimental.api.constructorArgs
 import kotlin.script.experimental.api.dependencies
+import kotlin.script.experimental.api.fileExtension
 import kotlin.script.experimental.api.foundAnnotations
 import kotlin.script.experimental.api.implicitReceivers
 import kotlin.script.experimental.api.onSuccess
@@ -128,6 +129,8 @@ interface ReplForJupyter {
     var outputConfig: OutputConfig
 
     val notebook: NotebookImpl
+
+    val fileExtension: String
 }
 
 class ReplForJupyterImpl(
@@ -290,6 +293,9 @@ class ReplForJupyterImpl(
         }
     }
 
+    override val fileExtension: String
+        get() = compilerConfiguration[ScriptCompilationConfiguration.fileExtension]!!
+
     private val ScriptCompilationConfiguration.classpath
         get() = this[ScriptCompilationConfiguration.dependencies]
             ?.filterIsInstance<JvmDependency>()

src/test/kotlin/org/jetbrains/kotlin/jupyter/test/replTests.kt

@@ -100,7 +100,7 @@ class ReplTest : AbstractReplTest() {
             val message = ex.message
 
             val expectedLocation = SourceCode.Location(SourceCode.Position(3, 11), SourceCode.Position(3, 14))
-            val expectedMessage = "Line_0.jupyter.kts (3:11 - 14) Unresolved reference: ppp"
+            val expectedMessage = "Line_0.${repl.fileExtension} (3:11 - 14) Unresolved reference: ppp"
 
             assertEquals(expectedLocation, location)
             assertEquals(expectedMessage, message)