feat: Add side by side refactor widget (#276)

RefactorContextHelper.hpp

@@ -0,0 +1,115 @@
+/* 
+ * Copyright (C) 2025 Petr Mironychev
+ *
+ * This file is part of QodeAssist.
+ *
+ * QodeAssist is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * QodeAssist is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with QodeAssist. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <QString>
+#include <QTextCursor>
+#include <QTextBlock>
+
+#include <texteditor/texteditor.h>
+#include <utils/textutils.h>
+
+namespace QodeAssist {
+
+struct RefactorContext
+{
+    QString originalText;
+    QString textBeforeCursor;
+    QString textAfterCursor;
+    QString contextBefore;
+    QString contextAfter;
+    int startPos{0};
+    int endPos{0};
+    bool isInsertion{false};
+};
+
+class RefactorContextHelper
+{
+public:
+    static RefactorContext extractContext(TextEditor::TextEditorWidget *editor, 
+                                          const Utils::Text::Range &range,
+                                          int contextLinesBefore = 3,
+                                          int contextLinesAfter = 3)
+    {
+        RefactorContext ctx;
+        if (!editor) {
+            return ctx;
+        }
+
+        QTextDocument *doc = editor->document();
+        ctx.startPos = range.begin.toPositionInDocument(doc);
+        ctx.endPos = range.end.toPositionInDocument(doc);
+        ctx.isInsertion = (ctx.startPos == ctx.endPos);
+
+        if (!ctx.isInsertion) {
+            QTextCursor cursor(doc);
+            cursor.setPosition(ctx.startPos);
+            cursor.setPosition(ctx.endPos, QTextCursor::KeepAnchor);
+            ctx.originalText = cursor.selectedText();
+            ctx.originalText.replace(QChar(0x2029), "\n");
+        } else {
+            QTextCursor cursor(doc);
+            cursor.setPosition(ctx.startPos);
+            
+            int posInBlock = cursor.positionInBlock();
+            cursor.movePosition(QTextCursor::StartOfBlock);
+            cursor.movePosition(QTextCursor::Right, QTextCursor::KeepAnchor, posInBlock);
+            ctx.textBeforeCursor = cursor.selectedText();
+            
+            cursor.setPosition(ctx.startPos);
+            cursor.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
+            ctx.textAfterCursor = cursor.selectedText();
+        }
+
+        ctx.contextBefore = extractContextLines(doc, ctx.startPos, contextLinesBefore, true);
+        ctx.contextAfter = extractContextLines(doc, ctx.endPos, contextLinesAfter, false);
+
+        return ctx;
+    }
+
+private:
+    static QString extractContextLines(QTextDocument *doc, int position, int lineCount, bool before)
+    {
+        QTextCursor cursor(doc);
+        cursor.setPosition(position);
+        QTextBlock currentBlock = cursor.block();
+
+        QStringList lines;
+        
+        if (before) {
+            QTextBlock block = currentBlock.previous();
+            for (int i = 0; i < lineCount && block.isValid(); ++i) {
+                lines.prepend(block.text());
+                block = block.previous();
+            }
+        } else {
+            QTextBlock block = currentBlock.next();
+            for (int i = 0; i < lineCount && block.isValid(); ++i) {
+                lines.append(block.text());
+                block = block.next();
+            }
+        }
+
+        return lines.join('\n');
+    }
+};
+
+} // namespace QodeAssist
+