First version

props2yaml-idea-plugin.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="PLUGIN_MODULE" version="4">
+  <component name="DevKit.ModuleBuildProperties" url="file://$MODULE_DIR$/resources/META-INF/plugin.xml" />
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/resources" type="java-resource" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="io.codearte.props2yaml:props2yaml:0.4" level="project" />
+  </component>
+</module>

resources/META-INF/plugin.xml

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+<idea-plugin version="2">
+  <id>io.codearte.props2yaml</id>
+  <name>Properties to YAML Converter</name>
+  <version>1.0</version>
+  <vendor email="[email protected]" url="http://www.codearte.io">Codearte</vendor>
+
+  <description><![CDATA[
+    Properties to YAML Converter
+  ]]></description>
+
+  <change-notes><![CDATA[
+      Add change notes here.<br>
+      <em>most HTML tags may be used</em>
+    ]]>
+  </change-notes>
+
+  <!-- please see http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/build_number_ranges.html for description -->
+  <idea-version since-build="141.0"/>
+
+  <extensions defaultExtensionNs="com.intellij">
+    <!-- Add your extensions here -->
+  </extensions>
+
+  <actions>
+    <!-- Add your actions here -->
+    <action id="io.codearte.props2yaml.ConvertAction" class="io.codearte.props2yaml.ConvertAction"
+            text="Convert Properties to YAML" description="Convert properties file to YAML">
+      <add-to-group group-id="CodeMenu" anchor="last"/>
+    </action>
+  </actions>
+
+</idea-plugin>

src/io/codearte/props2yaml/ConvertAction.java

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+package io.codearte.props2yaml;
+
+import java.io.IOException;
+
+import com.intellij.notification.Notification;
+import com.intellij.notification.NotificationType;
+import com.intellij.notification.Notifications;
+import com.intellij.openapi.actionSystem.AnAction;
+import com.intellij.openapi.actionSystem.AnActionEvent;
+import com.intellij.openapi.actionSystem.LangDataKeys;
+import com.intellij.openapi.application.ApplicationManager;
+import com.intellij.openapi.fileTypes.StdFileTypes;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.psi.PsiFile;
+
+/**
+ * @author Jakub Kubrynski
+ */
+public class ConvertAction extends AnAction {
+
+    public static final String GROUP_DISPLAY_ID = "io.codearte.props2yaml";
+
+    @Override
+    public void actionPerformed(AnActionEvent anActionEvent) {
+        PsiFile selectedFile = anActionEvent.getData(LangDataKeys.PSI_FILE);
+        if (selectedFile == null) {
+            Notifications.Bus.notify(new Notification(GROUP_DISPLAY_ID, "No file selected", "Please select properties file first", NotificationType.ERROR));
+            return;
+        }
+        if (!StdFileTypes.PROPERTIES.equals(selectedFile.getFileType())) {
+            Notifications.Bus.notify(new Notification(GROUP_DISPLAY_ID, "Incorrect file selected", "Please select properties file first", NotificationType.ERROR));
+            return;
+        }
+
+        VirtualFile propertiesFile = selectedFile.getVirtualFile();
+        ApplicationManager.getApplication().runWriteAction(() -> {
+            try {
+                String yamlContent = new Props2YAML(new String(propertiesFile.contentsToByteArray())).convert();
+                propertiesFile.rename(this, propertiesFile.getNameWithoutExtension() + ".yml");
+                propertiesFile.setBinaryContent(yamlContent.getBytes());
+            } catch (IOException e) {
+                Notifications.Bus.notify(new Notification(GROUP_DISPLAY_ID, "Cannot rename file", e.getMessage(), NotificationType.ERROR));
+            }
+        });
+
+        Notifications.Bus.notify(new Notification(GROUP_DISPLAY_ID, "File converted", "File converted successfully", NotificationType.INFORMATION));
+    }
+}