add kotlin specific key annotator

src/main/java/de/marhali/easyi18n/editor/kotlin/KeyAnnotator.java

@@ -0,0 +1,38 @@
+package de.marhali.easyi18n.editor.kotlin;
+
+import com.intellij.lang.annotation.AnnotationHolder;
+import com.intellij.lang.annotation.HighlightSeverity;
+import com.intellij.openapi.project.Project;
+
+import de.marhali.easyi18n.model.LocalizedNode;
+import de.marhali.easyi18n.service.DataStore;
+import de.marhali.easyi18n.service.SettingsService;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ *
+ * @author marhali
+ */
+public class KeyAnnotator {
+
+    /**
+     * Adds annotations for i18n keys with content preview for preferred locale.
+     * @param key I18n key extracted by psi element
+     * @param project Project instance
+     * @param holder Annotation holder
+     */
+    protected void annotate(@NotNull String key, @NotNull Project project, @NotNull AnnotationHolder holder) {
+        String previewLocale = SettingsService.getInstance(project).getState().getPreviewLocale();
+        LocalizedNode node = DataStore.getInstance(project).getTranslations().getNode(key);
+
+        if(node == null) { // Unknown translation. Just ignore it
+            return;
+        }
+
+        String tooltip = node.isLeaf() ? "I18n(" + previewLocale + ": " + node.getValue().get(previewLocale) + ")"
+                : "I18n ([])";
+
+        holder.newAnnotation(HighlightSeverity.INFORMATION, tooltip).create();
+    }
+}

src/main/java/de/marhali/easyi18n/editor/kotlin/KotlinKeyAnnotator.java

@@ -0,0 +1,30 @@
+package de.marhali.easyi18n.editor.kotlin;
+
+import com.intellij.lang.annotation.AnnotationHolder;
+import com.intellij.lang.annotation.Annotator;
+import com.intellij.psi.PsiElement;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.kotlin.psi.KtLiteralStringTemplateEntry;
+
+/**
+ * Kotlin specific translation key annotator
+ * @author marhali
+ */
+public class KotlinKeyAnnotator extends KeyAnnotator implements Annotator {
+
+    @Override
+    public void annotate(@NotNull PsiElement element, @NotNull AnnotationHolder holder) {
+        if(!(element instanceof KtLiteralStringTemplateEntry)) {
+            return;
+        }
+
+        String value = element.getText();
+
+        if(value == null) {
+            return;
+        }
+
+        annotate(value, element.getProject(), holder);
+    }
+}

src/main/resources/META-INF/de.marhali.easyi18n-kotlin.xml

@@ -0,0 +1,5 @@
+<idea-plugin>
+    <extensions defaultExtensionNs="com.intellij">
+        <annotator language="kotlin" implementationClass="de.marhali.easyi18n.editor.kotlin.KotlinKeyAnnotator" />
+    </extensions>
+</idea-plugin>