Add float2nr function

src/test/java/org/jetbrains/plugins/ideavim/ex/implementation/functions/floatFunctions/Float2NrFunctionTest.kt

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2003-2025 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package org.jetbrains.plugins.ideavim.ex.implementation.functions.floatFunctions
+
+import org.jetbrains.plugins.ideavim.VimBehaviorDiffers
+import org.jetbrains.plugins.ideavim.VimTestCase
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInfo
+
+class Float2NrFunctionTest : VimTestCase() {
+  @BeforeEach
+  override fun setUp(testInfo: TestInfo) {
+    super.setUp(testInfo)
+    configureByText("\n")
+  }
+
+  @Test
+  fun `test float2nr returns integer value for integer`() {
+    assertCommandOutput("echo float2nr(42)", "42")
+  }
+
+  @VimBehaviorDiffers(
+    originalVimAfter = "3 -23 2147483647 -2147483647 0",
+    description = "The Vim docs say float2nr(-1.0e150) should return -2147483647 not -2147483648"
+  )
+  @Test
+  fun `test float2nr returns integer value for float`() {
+    assertCommandOutput(
+      "echo float2nr(3.95) float2nr(-23.45) float2nr(1.0e100) float2nr(-1.0e150) float2nr(1.0e-100)",
+      "3 -23 2147483647 -2147483648 0"
+    )
+  }
+
+  @Test
+  fun `test float2nr with string causes errors`() {
+    enterCommand("echo float2nr('1.0')")
+    assertPluginError(true)
+    assertPluginErrorMessageContains("E808: Number or Float required")
+  }
+
+  @Test
+  fun `test float2nr with invalid string causes errors`() {
+    enterCommand("echo float2nr('cheese')")
+    assertPluginError(true)
+    assertPluginErrorMessageContains("E808: Number or Float required")
+  }
+
+  @Test
+  fun `test float2nr with list causes errors`() {
+    enterCommand("echo float2nr([1.0])")
+    assertPluginError(true)
+    assertPluginErrorMessageContains("E808: Number or Float required")
+  }
+
+  @Test
+  fun `test float2nr with dictionary causes errors`() {
+    enterCommand("echo float2nr({1: 1.0})")
+    assertPluginError(true)
+    assertPluginErrorMessageContains("E808: Number or Float required")
+  }
+}

vim-engine/src/main/kotlin/com/maddyhome/idea/vim/vimscript/model/functions/handlers/floatFunctions/Float2NrFunctionHandler.kt

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2003-2025 The IdeaVim authors
+ *
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE.txt file or at
+ * https://opensource.org/licenses/MIT.
+ */
+
+package com.maddyhome.idea.vim.vimscript.model.functions.handlers.floatFunctions
+
+import com.intellij.vim.annotations.VimscriptFunction
+import com.maddyhome.idea.vim.api.ExecutionContext
+import com.maddyhome.idea.vim.api.VimEditor
+import com.maddyhome.idea.vim.ex.exExceptionMessage
+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.VimFloat
+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
+
+@VimscriptFunction(name = "float2nr")
+internal class Float2NrFunctionHandler : FunctionHandler() {
+  override val minimumNumberOfArguments = 1
+  override val maximumNumberOfArguments = 1
+
+  override fun doFunction(
+    argumentValues: List<Expression>,
+    editor: VimEditor,
+    context: ExecutionContext,
+    vimContext: VimLContext,
+  ): VimDataType {
+    val argument = argumentValues[0].evaluate(editor, context, vimContext)
+    if (argument !is VimFloat && argument !is VimInt) {
+      throw exExceptionMessage("E808")  // E808: Number or Float required
+    }
+    return VimInt(argument.asDouble().toInt())
+  }
+}

vim-engine/src/main/resources/ksp-generated/engine_vimscript_functions.json

@@ -13,6 +13,7 @@
     "escape": "com.maddyhome.idea.vim.vimscript.model.functions.handlers.stringFunctions.EscapeFunctionHandler",
     "exists": "com.maddyhome.idea.vim.vimscript.model.functions.handlers.variousFunctions.ExistsFunctionHandler",
     "exp": "com.maddyhome.idea.vim.vimscript.model.functions.handlers.floatFunctions.ExpFunctionHandler",
+    "float2nr": "com.maddyhome.idea.vim.vimscript.model.functions.handlers.floatFunctions.Float2NrFunctionHandler",
     "floor": "com.maddyhome.idea.vim.vimscript.model.functions.handlers.floatFunctions.FloorFunctionHandler",
     "fmod": "com.maddyhome.idea.vim.vimscript.model.functions.handlers.floatFunctions.FmodFunctionHandler",
     "funcref": "com.maddyhome.idea.vim.vimscript.model.functions.handlers.varFunctions.FuncrefFunctionHandler",