Added emptyDirectory()

CMakeLists.txt

@@ -7,12 +7,14 @@ set(HEADERS
     dbcorelib_global.h
     fixedsizematrix.h
     randomdevice.h
+    utils/fileutils.h
     utils/jsonutils.h
     utils/timeutils.h
 )
 
 set(SOURCES
     randomdevice.cpp
+    utils/fileutils.cpp
     utils/jsonutils.cpp
     utils/timeutils.cpp
 )
@@ -25,6 +27,8 @@ target_link_libraries(dbcorelib Qt5::Core)
 
 target_include_directories(dbcorelib PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 
+add_dependencies(libs dbcorelib)
+
 
 add_executable(tst_fixedsizematrix tst_fixedsizematrix.cpp)
 add_test(tst_fixedsizematrix tst_fixedsizematrix)

utils/fileutils.cpp

@@ -0,0 +1,46 @@
+#include "fileutils.h"
+
+#include <QDir>
+#include <QDebug>
+#include <QDirIterator>
+#include <QFileInfo>
+#include <QFile>
+
+bool emptyDirectory(const QString &path)
+{
+    QDir dir(path);
+
+    if(!dir.exists())
+    {
+        qWarning() << "tried to empty non-existant dir" << path;
+        return true;
+    }
+
+    bool success = true;
+    // not empty -- we must empty it first
+    QDirIterator di(dir.absolutePath(), QDir::AllEntries | QDir::Hidden | QDir::System | QDir::NoDotAndDotDot);
+    while (di.hasNext()) {
+        di.next();
+        const QFileInfo& fi = di.fileInfo();
+        const QString &filePath = di.filePath();
+        bool ok;
+        if (fi.isDir() && !fi.isSymLink()) {
+            ok = QDir(filePath).removeRecursively(); // recursive
+        } else {
+            ok = QFile::remove(filePath);
+            if (!ok) { // Read-only files prevent directory deletion on Windows, retry with Write permission.
+                const QFile::Permissions permissions = QFile::permissions(filePath);
+                if (!(permissions & QFile::WriteUser))
+                    ok = QFile::setPermissions(filePath, permissions | QFile::WriteUser)
+                        && QFile::remove(filePath);
+            }
+        }
+        if (!ok)
+            success = false;
+    }
+
+    if(!success)
+        qWarning() << "could not empty" << path;
+
+    return success;
+}

utils/fileutils.h

@@ -0,0 +1,5 @@
+#pragma once
+
+#include "dbcorelib_global.h"
+
+bool DBCORELIB_EXPORT emptyDirectory(const QString &path);