Add support for JSON/Bash in heredocs

res/META-INF/plugin.xml

@@ -205,6 +205,9 @@
     <!-- Inject TIL into TerraformConfig -->
     <languageInjector implementation="org.intellij.plugins.hil.ILLanguageInjector"/>
 
+    <!-- Inject JSON/Bash -->
+    <multiHostInjector implementation="org.intellij.plugins.hil.HeredocInjector" />
+
     <!-- Terraform Config language -->
     <fileTypeFactory implementation="org.intellij.plugins.hcl.terraform.config.TerraformFileTypeFactory"/>
     <lang.parserDefinition language="HCL-Terraform" implementationClass="org.intellij.plugins.hcl.terraform.config.TerraformParserDefinition"/>

src/kotlin/org/intellij/plugins/hil/HeredocInjector.kt

@@ -0,0 +1,95 @@
+/*
+ * Copyright 2000-2018 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.intellij.plugins.hil;
+
+import com.intellij.lang.Language;
+import com.intellij.lang.injection.MultiHostInjector;
+import com.intellij.lang.injection.MultiHostRegistrar;
+import com.intellij.psi.PsiElement;
+import org.intellij.plugins.hcl.psi.HCLHeredocContent;
+import com.intellij.openapi.util.TextRange
+import com.intellij.psi.PsiLanguageInjectionHost
+import com.intellij.psi.ElementManipulators
+import com.google.common.collect.TreeRangeSet
+import com.google.common.collect.Range
+import com.intellij.openapi.fileTypes.FileTypeManager
+import com.intellij.openapi.fileTypes.LanguageFileType
+import com.intellij.openapi.fileTypes.impl.AbstractFileType
+
+
+class HeredocInjector : MultiHostInjector{
+
+  override fun getLanguagesToInject(registrar: MultiHostRegistrar, injectionHost: PsiElement) {
+    if (injectionHost !is HCLHeredocContent)
+      return
+    if (injectionHost.textLength == 0)
+      return
+
+    val rangeSet = TreeRangeSet.create<Int>()
+    val range = ElementManipulators.getValueTextRange(injectionHost)
+    val interpolationRanges = ILLanguageInjector.Companion.getILRangesInText(injectionHost.text)
+    rangeSet.add(Range.closed(range.startOffset, range.endOffset))
+    interpolationRanges.forEach { interpolation ->
+      rangeSet.remove(Range.closed(interpolation.startOffset, interpolation.endOffset))
+    }
+    val lang = getHeredocLanguage(injectionHost.text)
+
+    if (lang is Language && !rangeSet.isEmpty) {
+      registrar.startInjecting(lang);
+      rangeSet.asRanges().forEach{ leftovers ->
+        val lower = leftovers.lowerEndpoint()
+        val upper = leftovers.upperEndpoint()
+        registrar.addPlace("", "", (injectionHost as PsiLanguageInjectionHost), TextRange(lower, upper) )
+      }
+      registrar.doneInjecting()
+    }
+
+    if(!interpolationRanges.isEmpty()){
+      interpolationRanges.forEach { interpolation ->
+        registrar.startInjecting(HILLanguage)
+        registrar.addPlace("", "", (injectionHost as PsiLanguageInjectionHost), TextRange(interpolation.startOffset, interpolation.endOffset) )
+        registrar.doneInjecting()
+      }
+
+    }
+    return
+  }
+
+  fun getHeredocLanguage(text: String) : Language?{
+    // If it starts with a curly it should be JSON
+    if (text.startsWith("{")){
+      val fileType = FileTypeManager.getInstance().getFileTypeByExtension("json")
+      if (fileType !is AbstractFileType) {
+        return (fileType as LanguageFileType).language
+      }
+    }
+    // If it starts with a shebang it should be a shell script
+    if (text.startsWith("#!")){
+      val fileType = FileTypeManager.getInstance().getFileTypeByExtension("sh")
+      if (fileType !is AbstractFileType) {
+        return (fileType as LanguageFileType).language
+      }
+    }
+
+    return null
+  }
+
+  override fun elementsToInjectIn(): MutableList<out Class<out PsiElement>> {
+    return mutableListOf(HCLHeredocContent::class.java)
+  }
+
+
+}