Use CreateFileAction as action base

This actually creates the file already. The only task is now to provide the initial filename template.

src/main/kotlin/CreateFileWithFilenameTemplateAction.kt

@@ -0,0 +1,49 @@
+import com.intellij.icons.AllIcons
+import com.intellij.ide.IdeBundle
+import com.intellij.ide.actions.CreateFileAction
+import com.intellij.ide.ui.newItemPopup.NewItemPopupUtil
+import com.intellij.ide.ui.newItemPopup.NewItemSimplePopupPanel
+import com.intellij.lang.LangBundle
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.ui.InputValidatorEx
+import com.intellij.openapi.ui.popup.JBPopup
+import com.intellij.psi.PsiDirectory
+import com.intellij.psi.PsiElement
+import java.awt.event.InputEvent
+import java.util.function.Consumer
+
+class CreateFileWithFilenameTemplateAction :
+    CreateFileAction("Flyway File", "Create flyway migration file", AllIcons.FileTypes.Unknown) {
+    override fun invokeDialog(
+        project: Project,
+        directory: PsiDirectory,
+        elementsConsumer: Consumer<Array<PsiElement?>?>
+    ) {
+        val validator: MyInputValidator = MyValidator(project, directory)
+        createLightWeightPopup(validator, elementsConsumer).showCenteredInCurrentWindow(project)
+    }
+
+    private fun createLightWeightPopup(
+        validator: MyInputValidator,
+        consumer: Consumer<Array<PsiElement?>?>
+    ): JBPopup {
+        val contentPanel = NewItemSimplePopupPanel()
+        val nameField = contentPanel.textField
+
+        val popup = NewItemPopupUtil.createNewItemPopup(IdeBundle.message("title.new.file"), contentPanel, nameField)
+        contentPanel.applyAction = com.intellij.util.Consumer { event: InputEvent? ->
+            val name = nameField.text
+            if (validator.checkInput(name) && validator.canClose(name)) {
+                popup.closeOk(event)
+                consumer.accept(validator.createdElements)
+            } else {
+                val errorMessage =
+                    if (validator is InputValidatorEx) (validator as InputValidatorEx).getErrorText(name) else LangBundle.message(
+                        "incorrect.name"
+                    )
+                contentPanel.setError(errorMessage)
+            }
+        }
+        return popup
+    }
+}

src/main/kotlin/FilenameTemplateAction.kt

@@ -1,60 +0,0 @@
-import com.intellij.notification.NotificationGroupManager
-import com.intellij.notification.NotificationType
-import com.intellij.openapi.actionSystem.AnAction
-import com.intellij.openapi.actionSystem.AnActionEvent
-import com.intellij.openapi.ui.popup.JBPopup
-import com.intellij.openapi.ui.popup.JBPopupFactory
-import com.intellij.openapi.ui.popup.JBPopupListener
-import com.intellij.openapi.ui.popup.LightweightWindowEvent
-import com.intellij.ui.components.JBTextField
-import java.awt.FlowLayout
-import java.awt.event.ActionEvent
-import java.awt.event.ActionListener
-import javax.swing.JPanel
-
-class FilenameTemplateAction : AnAction() {
-    private var filenameTemplateField: JBTextField = JBTextField()
-    private var filenameTemplatePopup: JBPopup? = null
-
-    init {
-        filenameTemplateField.columns = 20
-        filenameTemplateField.addActionListener(AddStatusClickListener())
-    }
-
-    private inner class AddStatusClickListener : ActionListener {
-        override fun actionPerformed(e: ActionEvent) {
-            filenameTemplatePopup!!.closeOk(null)
-        }
-    }
-
-    override fun actionPerformed(event: AnActionEvent) {
-
-        val statusTextFieldPanel = JPanel(FlowLayout(FlowLayout.CENTER)).also {
-            it.add(filenameTemplateField)
-        }
-
-        filenameTemplatePopup =
-            JBPopupFactory.getInstance().createComponentPopupBuilder(statusTextFieldPanel, filenameTemplateField)
-                .setShowBorder(true)
-                .setShowShadow(true)
-                .setRequestFocus(true)
-                .setCancelOnWindowDeactivation(true)
-                .createPopup()
-
-        val listener = object : JBPopupListener {
-            override fun onClosed(e: LightweightWindowEvent) {
-                super.onClosed(e)
-                if (e.isOk) {
-                    NotificationGroupManager
-                        .getInstance()
-                        .getNotificationGroup("Filename Template Notification Group")
-                        .createNotification(filenameTemplateField.text, NotificationType.INFORMATION)
-                        .notify(event.project)
-                }
-            }
-        }
-
-        filenameTemplatePopup!!.addListener(listener)
-        filenameTemplatePopup!!.showInFocusCenter()
-    }
-}

src/main/resources/META-INF/plugin.xml

@@ -17,7 +17,7 @@
 
     <actions>
         <!-- Add your actions here -->
-        <action id="FilenameTemplateAction" class="FilenameTemplateAction" text="Filename Template Action">
+        <action id="FilenameTemplateAction" class="CreateFileWithFilenameTemplateAction" text="Filename Template Action">
             <add-to-group group-id="NewGroup" anchor="after" relative-to-action="NewScratchFile"/>
         </action>
     </actions>