Add VimScript 'renaming()' function

src/main/java/com/maddyhome/idea/vim/vimscript/model/functions/handlers/RenamingFunctionHandler.kt

@@ -0,0 +1,48 @@
+/*
+ * IdeaVim - Vim emulator for IDEs based on the IntelliJ platform
+ * Copyright (C) 2003-2021 The IdeaVim authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.maddyhome.idea.vim.vimscript.model.functions.handlers
+
+import com.intellij.refactoring.rename.inplace.InplaceRefactoring
+import com.maddyhome.idea.vim.api.ExecutionContext
+import com.maddyhome.idea.vim.api.VimEditor
+import com.maddyhome.idea.vim.newapi.ij
+import com.maddyhome.idea.vim.vimscript.model.VimLContext
+import com.maddyhome.idea.vim.vimscript.model.datatypes.VimDataType
+import com.maddyhome.idea.vim.vimscript.model.datatypes.VimInt
+import com.maddyhome.idea.vim.vimscript.model.expressions.Expression
+import com.maddyhome.idea.vim.vimscript.model.functions.FunctionHandler
+
+object RenamingFunctionHandler : FunctionHandler() {
+
+  override val name = "renaming"
+  override val minimumNumberOfArguments = 0
+  override val maximumNumberOfArguments = 0
+  
+  override fun doFunction(
+    argumentValues: List<Expression>,
+    editor: VimEditor,
+    context: ExecutionContext,
+    vimContext: VimLContext,
+  ): VimDataType {
+    return if (InplaceRefactoring.getActiveInplaceRenamer(editor.ij) == null)
+      VimInt.ZERO
+    else
+      VimInt.ONE
+  }
+}

src/main/resources/META-INF/includes/VimLibraryFunctions.xml

@@ -22,5 +22,6 @@
     <vimLibraryFunction implementation="com.maddyhome.idea.vim.vimscript.model.functions.handlers.TolowerFunctionHandler" name="tolower"/>
     <vimLibraryFunction implementation="com.maddyhome.idea.vim.vimscript.model.functions.handlers.ToupperFunctionHandler" name="toupper"/>
     <vimLibraryFunction implementation="com.maddyhome.idea.vim.vimscript.model.functions.handlers.JoinFunctionHandler" name="join"/>
+    <vimLibraryFunction implementation="com.maddyhome.idea.vim.vimscript.model.functions.handlers.RenamingFunctionHandler" name="renaming"/>
   </extensions>
-</idea-plugin>
+</idea-plugin>