Add helper function to safely move away file or directory

Try numberical suffix until you find one that isn't used yet.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/qthelper.cpp b/qthelper.cpp
index 6e3c957a6..3a4daf833 100644
--- a/qthelper.cpp
+++ b/qthelper.cpp
@@ -627,6 +627,28 @@ extern "C" const char *system_default_directory(void)
 	return filename;
 }
 
+extern "C" char *move_away(const char *old_path)
+{
+	if (verbose > 1)
+		qDebug() << "move away" << old_path;
+	QFile oldFile(old_path);
+	QFile newFile;
+	QString newPath;
+	int i = 0;
+	do {
+		newPath = QString(old_path) + QString(".%1").arg(++i);
+		newFile.setFileName(newPath);
+	} while(newFile.exists());
+	if (verbose > 1)
+		qDebug() << "renaming to" << newPath;
+	if (!oldFile.rename(newPath)) {
+		qDebug() << "rename of" << old_path << "to" << newPath << "failed";
+		return strdup("");
+	}
+	return strdup(qPrintable(newPath));
+
+}
+
 extern "C" char *get_file_name(const char *fileName)
 {
 	QFileInfo fileInfo(fileName);