From 71590b67351b77432fe02b0df6e46d5b9d2fe92c Mon Sep 17 00:00:00 2001
From: Mikhail Glukhikh <mikhail.glukhikh@jetbrains.com>
Date: Mon, 3 Jun 2019 12:49:26 +0300
Subject: [PATCH] Introduce Kotlin language substitutor to fix exceptions in
 velocity files

Related to KT-31470 (should fix the problem or at least soften it)
May be related also to KT-30977
#KT-30886 Fixed
---
 idea/resources/META-INF/plugin-common.xml     |  2 ++
 .../kotlin/idea/KotlinLanguageSubstitutor.kt  | 22 +++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 idea/src/org/jetbrains/kotlin/idea/KotlinLanguageSubstitutor.kt

diff --git a/idea/resources/META-INF/plugin-common.xml b/idea/resources/META-INF/plugin-common.xml
index 107b2da98f1..eef0bc80864 100644
--- a/idea/resources/META-INF/plugin-common.xml
+++ b/idea/resources/META-INF/plugin-common.xml
@@ -863,6 +863,8 @@
 
     <orderEnumerationHandlerFactory implementation="org.jetbrains.kotlin.idea.roots.KotlinNonJvmOrderEnumerationHandler$Factory"/>
 
+    <lang.substitutor language="kotlin" order="last" implementationClass="org.jetbrains.kotlin.idea.KotlinLanguageSubstitutor"/>
+
     <intentionAction>
       <className>org.jetbrains.kotlin.idea.intentions.FoldInitializerAndIfToElvisIntention</className>
       <category>Kotlin</category>
diff --git a/idea/src/org/jetbrains/kotlin/idea/KotlinLanguageSubstitutor.kt b/idea/src/org/jetbrains/kotlin/idea/KotlinLanguageSubstitutor.kt
new file mode 100644
index 00000000000..5b145296625
--- /dev/null
+++ b/idea/src/org/jetbrains/kotlin/idea/KotlinLanguageSubstitutor.kt
@@ -0,0 +1,22 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea
+
+import com.intellij.lang.Language
+import com.intellij.openapi.fileTypes.PlainTextLanguage
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.vfs.VirtualFile
+import com.intellij.psi.LanguageSubstitutor
+
+class KotlinLanguageSubstitutor : LanguageSubstitutor() {
+    override fun getLanguage(file: VirtualFile, project: Project): Language? {
+        val name = file.name
+        if (name.endsWith(".kt.ft")) {
+            return PlainTextLanguage.INSTANCE
+        }
+        return null
+    }
+}
\ No newline at end of file