Feat #339 Git view/merge LLM view

build.gradle.kts

@@ -7,7 +7,7 @@ plugins {
 }
 
 group = "com.devoxx.genie"
-version = "0.2.28"
+version = "0.2.30"
 
 repositories {
     mavenCentral()

src/main/java/com/devoxx/genie/service/FileListObserver.java

@@ -11,4 +11,3 @@ public interface FileListObserver {
 
     void allFilesRemoved();
 }
-

src/main/java/com/devoxx/genie/service/MessageCreationService.java

@@ -28,6 +28,13 @@ public class MessageCreationService {
 
     public static final String CONTEXT_PROMPT = "Context: \n";
 
+    private static final String GIT_DIFF_INSTRUCTIONS = """
+        Please analyze the code and provide ONLY the modified code in your response.
+        Do not include any explanations or comments.
+        The response should contain just the modified code wrapped in a code block using the appropriate language identifier.
+        If multiple files need to be modified, provide each file's content in a separate code block.
+        """;
+
     @NotNull
     public static MessageCreationService getInstance() {
         return ApplicationManager.getApplication().getService(MessageCreationService.class);
@@ -56,6 +63,11 @@ public UserMessage createUserMessage(@NotNull ChatMessageContext chatMessageCont
             stringBuilder.append("<SystemPrompt>").append(systemPrompt).append("</SystemPrompt>\n\n");
         }
 
+        // If git diff is enabled, add special instructions
+        if (DevoxxGenieStateService.getInstance().getUseDiffMerge()) {
+            stringBuilder.append("<DiffInstructions>").append(GIT_DIFF_INSTRUCTIONS).append("</DiffInstructions>\n\n");
+        }
+
         // The user prompt is always appended
         appendIfNotEmpty(stringBuilder, "<UserPrompt>" + chatMessageContext.getUserPrompt() + "</UserPrompt>");
 
@@ -124,6 +136,12 @@ public UserMessage createUserMessage(@NotNull ChatMessageContext chatMessageCont
                                                                      String context) {
         StringBuilder stringBuilder = new StringBuilder();
 
+        // If git diff is enabled, add special instructions at the beginning
+        if (DevoxxGenieStateService.getInstance().getUseDiffMerge() ||
+            DevoxxGenieStateService.getInstance().getUseSimpleDiff()) {
+            stringBuilder.append("<DiffInstructions>").append(GIT_DIFF_INSTRUCTIONS).append("</DiffInstructions>\n\n");
+        }
+
         // Check if this is the first message in the conversation, if so add the context
         if (ChatMemoryService.getInstance().messages(chatMessageContext.getProject()).size() == 1) {
             stringBuilder.append("<Context>");

src/main/java/com/devoxx/genie/service/gitdiff/GitMergeService.java

@@ -0,0 +1,113 @@
+package com.devoxx.genie.service.gitdiff;
+
+import com.devoxx.genie.ui.settings.DevoxxGenieStateService;
+import com.devoxx.genie.ui.util.NotificationUtil;
+import com.intellij.diff.DiffContentFactory;
+import com.intellij.diff.DiffManager;
+import com.intellij.diff.DiffManagerImpl;
+import com.intellij.diff.contents.DiffContent;
+import com.intellij.diff.contents.DocumentContent;
+import com.intellij.diff.contents.DocumentContentImpl;
+import com.intellij.diff.requests.DiffRequest;
+import com.intellij.diff.requests.SimpleDiffRequest;
+import com.intellij.diff.requests.TextMergeRequestImpl;
+import com.intellij.openapi.application.ApplicationManager;
+import com.intellij.openapi.diagnostic.Logger;
+import com.intellij.openapi.editor.Document;
+import com.intellij.openapi.editor.impl.DocumentImpl;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.vfs.VirtualFile;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+public class GitMergeService {
+
+    private static final Logger LOG = Logger.getInstance(GitMergeService.class);
+
+    @NotNull
+    public static GitMergeService getInstance() {
+        return ApplicationManager.getApplication().getService(GitMergeService.class);
+    }
+
+    /**
+     * Shows a three-way merge view with:
+     * - Left: Original code
+     * - Center: Merge result (initially empty)
+     * - Right: LLM's modified version
+     */
+    public void showMerge(@NotNull Project project,
+                          @NotNull String originalContent,
+                          @NotNull String modifiedContent,
+                          @NotNull String title,
+                          @NotNull Document targetDocument) {
+        DevoxxGenieStateService instance = DevoxxGenieStateService.getInstance();
+        if (!instance.getUseSimpleDiff() && !instance.getUseDiffMerge()) {
+            LOG.info("Diff view is disabled");
+            return;
+        }
+
+        ApplicationManager.getApplication().invokeLater(() -> {
+            DiffContentFactory factory = DiffContentFactory.getInstance();
+
+            // Create contents for three-way merge
+            DocumentContent originalContentDoc = factory.create(project, originalContent);
+
+            DocumentContent modifiedContent1 = factory.create(project, modifiedContent);
+            DocumentContent targetDocumentContent = factory.create(project, targetDocument);
+
+            Document originalDocument = originalContentDoc.getDocument();
+
+            TextMergeRequestImpl request = new TextMergeRequestImpl(
+                project,
+                targetDocumentContent,
+                originalDocument.getCharsSequence(),
+                List.of(originalContentDoc, modifiedContent1, targetDocumentContent),
+                title,
+                List.of("Original Code", "LLM Modified Code", "Merge Result")
+            );
+
+            // Show the merge dialog
+            DiffManager.getInstance().showMerge(project, request);
+        });
+    }
+
+    /**
+     * Git diff view
+     * @param project the project
+     */
+    public void showDiffView(Project project, VirtualFile originalFile, String suggestedContent) {
+
+        ApplicationManager.getApplication().runReadAction(() -> {
+            if (originalFile == null) {
+                NotificationUtil.sendNotification(project, "Files not found");
+                return;
+            }
+
+            if (suggestedContent == null || suggestedContent.isEmpty()) {
+                NotificationUtil.sendNotification(project, "Suggested content is empty");
+                return;
+            }
+            Document originalContent = com.intellij.openapi.fileEditor.FileDocumentManager
+                .getInstance()
+                .getDocument(originalFile);
+
+            if (originalContent == null) {
+                NotificationUtil.sendNotification(project, "Error reading file: " + originalFile.getName());
+                return;
+            }
+
+            DiffContent content1 = new DocumentContentImpl(originalContent);
+            DiffContent content2 = new DocumentContentImpl(new DocumentImpl(suggestedContent));
+
+            DiffRequest diffRequest = new SimpleDiffRequest(
+                "Diff",
+                List.of(content1, content2),
+                List.of("Original code", "LLM suggested")
+            );
+
+            ApplicationManager.getApplication().invokeLater(() ->
+                DiffManagerImpl.getInstance().showDiff(project, diffRequest));
+        });
+    }
+}

src/main/java/com/devoxx/genie/ui/DevoxxGenieToolWindowContent.java

@@ -21,20 +21,29 @@
 import com.devoxx.genie.ui.settings.DevoxxGenieStateService;
 import com.devoxx.genie.ui.topic.AppTopics;
 import com.devoxx.genie.ui.util.NotificationUtil;
+import com.intellij.diff.DiffManagerImpl;
+import com.intellij.diff.contents.DiffContent;
+import com.intellij.diff.contents.FileContentImpl;
+import com.intellij.diff.requests.DiffRequest;
+import com.intellij.diff.requests.SimpleDiffRequest;
 import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.ui.ComboBox;
 import com.intellij.openapi.ui.Messages;
 import com.intellij.openapi.ui.Splitter;
 import com.intellij.openapi.util.Disposer;
+import com.intellij.openapi.util.NlsContexts;
+import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.openapi.wm.ToolWindow;
 import com.intellij.ui.OnePixelSplitter;
 import com.intellij.ui.components.JBScrollPane;
 import com.intellij.util.messages.MessageBusConnection;
 import lombok.Getter;
+import org.apache.xmlbeans.impl.xb.xsdschema.SimpleContentDocument;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import javax.swing.*;
 import java.awt.*;

src/main/java/com/devoxx/genie/ui/listener/PromptSubmissionListener.java

@@ -2,6 +2,17 @@
 
 import com.intellij.openapi.project.Project;
 
+/**
+ * Interface for listeners that want to be notified when a prompt is submitted.
+ *
+ * @see com.intellij.openapi.project.Project
+ */
 public interface PromptSubmissionListener {
+    /**
+     * Called when a prompt is submitted.
+     *
+     * @param project the current project
+     * @param prompt  the submitted prompt
+     */
     void onPromptSubmitted(Project project, String prompt);
 }

src/main/java/com/devoxx/genie/ui/panel/ChatResponsePanel.java

@@ -2,12 +2,20 @@
 
 import com.devoxx.genie.model.enumarations.ModelProvider;
 import com.devoxx.genie.model.request.ChatMessageContext;
+import com.devoxx.genie.model.request.EditorInfo;
 import com.devoxx.genie.service.FileListManager;
 import com.devoxx.genie.service.ProjectContentService;
+import com.devoxx.genie.service.gitdiff.GitMergeService;
 import com.devoxx.genie.ui.component.ExpandablePanel;
 import com.devoxx.genie.ui.processor.NodeProcessorFactory;
 import com.devoxx.genie.ui.settings.DevoxxGenieStateService;
 import com.devoxx.genie.util.DefaultLLMSettingsUtil;
+import com.intellij.openapi.application.ApplicationManager;
+import com.intellij.openapi.editor.Document;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.openapi.fileEditor.FileDocumentManager;
+import com.intellij.openapi.fileEditor.FileEditorManager;
+import com.intellij.openapi.util.Computable;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.ui.JBColor;
 import com.knuddels.jtokkit.api.Encoding;
@@ -22,7 +30,10 @@
 import javax.swing.*;
 import java.awt.*;
 import java.text.NumberFormat;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Locale;
+import java.util.Objects;
 
 import static com.devoxx.genie.ui.util.DevoxxGenieFontsUtil.SourceCodeProFontPlan14;
 
@@ -53,6 +64,16 @@ public ChatResponsePanel(@NotNull ChatMessageContext chatMessageContext) {
     private void addResponsePane(@NotNull ChatMessageContext chatMessageContext) {
         String markDownResponse = chatMessageContext.getAiMessage().text();
         Node document = Parser.builder().build().parse(markDownResponse);
+
+        DevoxxGenieStateService stateService = DevoxxGenieStateService.getInstance();
+
+        // If git diff is enabled, try to extract code blocks and show diff
+        if (stateService.getUseDiffMerge()) {
+            processGitMerge(chatMessageContext, document);
+        } else if (stateService.getUseSimpleDiff()) {
+            processGitDiff(chatMessageContext, document);
+        }
+
         addDocumentNodesToPanel(document);
 
         if (chatMessageContext.hasFiles()) {
@@ -67,6 +88,65 @@ private void addResponsePane(@NotNull ChatMessageContext chatMessageContext) {
         }
     }
 
+    private void processGitMerge(@NotNull ChatMessageContext chatMessageContext, @NotNull Node document) {
+        // Get original code from context
+        String originalCode;
+        EditorInfo editorInfo = chatMessageContext.getEditorInfo();
+
+        // Wrap the document access in a read action
+        originalCode = ApplicationManager
+            .getApplication()
+            .runReadAction((Computable<String>)  () -> {
+            if (editorInfo.getSelectedText() != null) {
+                return editorInfo.getSelectedText();
+            } else {
+                List<VirtualFile> selectedFiles = editorInfo.getSelectedFiles();
+                if (selectedFiles == null || selectedFiles.isEmpty()) {
+                    return null;
+                }
+                VirtualFile originalFile = selectedFiles.get(0);
+                Document originalDoc = FileDocumentManager.getInstance().getDocument(originalFile);
+                if (originalDoc == null) {
+                    return null;
+                }
+                return originalDoc.getText();
+            }
+        });
+
+        if (originalCode == null) {
+            return;
+        }
+
+
+        // Find the first code block in the response
+        Node node = document.getFirstChild();
+        while (node != null) {
+            if (node instanceof FencedCodeBlock codeBlock) {
+                String modifiedCode = codeBlock.getLiteral();
+
+                Document editorDocument = com.intellij.openapi.application.ApplicationManager.getApplication()
+                    .runReadAction((com.intellij.openapi.util.Computable<Document>) () ->
+                        Objects.requireNonNull(FileEditorManager.getInstance(chatMessageContext.getProject())
+                                .getSelectedTextEditor())
+                            .getDocument()
+                    );
+
+                // Show merge using our service
+                GitMergeService.getInstance().showMerge(
+                    chatMessageContext.getProject(),
+                    originalCode,
+                    modifiedCode,
+                    "Merge LLM Changes",
+                    editorDocument
+                );
+
+                // Only show diff for first code block
+                break;
+            }
+            node = node.getNext();
+        }
+    }
+
     private void addMetricExecutionInfo(@NotNull ChatMessageContext chatMessageContext) {
         JPanel metricExecutionInfoPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
         metricExecutionInfoPanel.setOpaque(false);
@@ -99,6 +179,65 @@ private void addMetricExecutionInfo(@NotNull ChatMessageContext chatMessageConte
         add(metricExecutionInfoPanel);
     }
 
+    /**
+     * Process the git diff.
+     * @param chatMessageContext the chat message context
+     * @param document the document
+     */
+    private void processGitDiff(@NotNull ChatMessageContext chatMessageContext, @NotNull Node document) {
+        // Get original file info
+        EditorInfo editorInfo = chatMessageContext.getEditorInfo();
+        if (editorInfo == null) {
+            return;
+        }
+
+        // Handle single file case
+        if (editorInfo.getSelectedText() != null) {
+            Editor editor = FileEditorManager.getInstance(chatMessageContext.getProject())
+                .getSelectedTextEditor();
+
+            if (editor != null) {
+                String originalCode = editorInfo.getSelectedText();
+
+                // Find first code block in response
+                Node node = document.getFirstChild();
+                while (node != null) {
+                    if (node instanceof FencedCodeBlock codeBlock) {
+
+                        GitMergeService.getInstance().showMerge(
+                            chatMessageContext.getProject(),
+                            originalCode,
+                            codeBlock.getLiteral(),
+                            "Merge LLM Changes",
+                            editor.getDocument()
+                        );
+                        break;
+                    }
+                    node = node.getNext();
+                }
+            }
+        }
+        // Handle multiple files case
+        else if (editorInfo.getSelectedFiles() != null && !editorInfo.getSelectedFiles().isEmpty()) {
+            List<VirtualFile> files = editorInfo.getSelectedFiles();
+            List<String> modifiedContents = new ArrayList<>();
+
+            // Collect modified contents from code blocks
+            Node node = document.getFirstChild();
+            while (node != null) {
+                if (node instanceof FencedCodeBlock codeBlock) {
+                    modifiedContents.add(codeBlock.getLiteral());
+                }
+                node = node.getNext();
+            }
+
+            GitMergeService.getInstance().showDiffView(
+                    chatMessageContext.getProject(),
+                    files.get(0),
+                    modifiedContents.get(0));
+        }
+    }
+
     /**
      * Ollama does not count the input context tokens in the token usage, this method fixes this.
      *