TDEFileReplace: fixed unresponsive GUI and application crash when circular references are found on the file system.

Added a message to advice the user of the possible circular reference. This relates to bug 2264.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>

tdefilereplace/tdefilereplacepart.cpp

@@ -52,6 +52,9 @@
 #include "commandengine.h"
 #include "whatthis.h"
 
+// Change this as well if increasing the max value allowed for the m_spbMaxDepth spinbox
+static const int CIRCULAR_LINK_DETECTION_LEVEL = 256;
+
 using namespace whatthisNameSpace;
 
 //PUBLIC CONSTRUCTORS
@@ -71,6 +74,7 @@ TDEFileReplacePart::TDEFileReplacePart(TQWidget* parentWidget, const char* , TQO
   m_optionMask = TQDir::Files;
   m_w = widget();
   m_option = 0;
+  m_circ_ref_warning_shown = false;
 
   loadOptionsFromRC();
   initView();
@@ -130,7 +134,10 @@ void TDEFileReplacePart::slotSearchingOperation()
   uint filesNumber = 0;
 
   if(m_option->m_recursive)
+    {
+    m_circ_ref_warning_shown = false;
     recursiveFileSearch(currentDirectory, currentFilter, filesNumber, 0);
+    }
   else
     fileSearch(currentDirectory, currentFilter);
 
@@ -196,6 +203,7 @@ void TDEFileReplacePart::slotReplacingOperation()
   if(m_option->m_recursive)
     {
       int filesNumber = 0;
+      m_circ_ref_warning_shown = false;
       recursiveFileReplace(currentDirectory, filesNumber, 0);
     }
   else
@@ -972,6 +980,19 @@ void TDEFileReplacePart::recursiveFileReplace(const TQString& directoryName, int
   // if m_stop == true or the max depth level is reached, then interrupt recursion
   if (m_stop || (m_option->m_limitDepth && depth > m_option->m_maxDepth))
     return;
+  else if (!m_option->m_limitDepth && depth > CIRCULAR_LINK_DETECTION_LEVEL)
+    {
+      if (!m_circ_ref_warning_shown)
+        {
+          KMessageBox::information(m_w,
+              i18n("It seems you have a circular reference in your file system."
+                  "The search has been limited to this sublevel to prevent"
+                  "TDEFileReplace from crashing."),
+              i18n("Circular reference detected"));
+          m_circ_ref_warning_shown = true;
+        }
+      return;
+    }  
   else
     {
       TQDir d(directoryName);
@@ -985,7 +1006,6 @@ void TDEFileReplacePart::recursiveFileReplace(const TQString& directoryName, int
 
       for(filesIt = filesList.begin(); filesIt != filesList.end(); ++filesIt)
         {
-          //if m_stop == true then end for-loop
           if(m_stop)
             break;
 
@@ -1001,6 +1021,7 @@ void TDEFileReplacePart::recursiveFileReplace(const TQString& directoryName, int
 
           m_view->displayScannedFiles(filesNumber);
 
+          kapp->processEvents();
           // Replace recursively if "filePath" is a directory and we have not reached the max depth level
           if (qi.isDir())
             { 
@@ -1011,7 +1032,6 @@ void TDEFileReplacePart::recursiveFileReplace(const TQString& directoryName, int
             }  
           else
             {
-	            kapp->processEvents();
               if(m_option->m_backup)
                 replaceAndBackup(d.canonicalPath(), fileName);
               else
@@ -1296,6 +1316,19 @@ void TDEFileReplacePart::recursiveFileSearch(const TQString& directoryName, cons
   // if m_stop == true or the max depth level is reached, then interrupt recursion
   if (m_stop || (m_option->m_limitDepth && depth > m_option->m_maxDepth))
     return;
+  else if (!m_option->m_limitDepth && depth > CIRCULAR_LINK_DETECTION_LEVEL)
+    {
+      if (!m_circ_ref_warning_shown)
+        {
+          KMessageBox::information(m_w,
+              i18n("It seems you have a circular reference in your file system. "
+                  "The search has been limited to this sublevel to prevent "
+                  "TDEFileReplace from crashing."),
+              i18n("Circular reference detected"));
+          m_circ_ref_warning_shown = true;
+        }
+      return;
+    }  
   else
     {
       TQDir d(directoryName);
@@ -1309,7 +1342,6 @@ void TDEFileReplacePart::recursiveFileSearch(const TQString& directoryName, cons
 
       for(filesIt = filesList.begin(); filesIt != filesList.end(); ++filesIt)
         {
-          // stop polling
           if(m_stop)
             break;
 
@@ -1323,6 +1355,7 @@ void TDEFileReplacePart::recursiveFileSearch(const TQString& directoryName, cons
 
           m_view->displayScannedFiles(filesNumber);
 
+          kapp->processEvents();
           // Searchs recursively if "filePath" is a directory and we have not reached the max depth level
           if (fileInfo.isDir())
             { 
@@ -1333,7 +1366,6 @@ void TDEFileReplacePart::recursiveFileSearch(const TQString& directoryName, cons
             }  
           else
             {
-              kapp->processEvents();
               search(filePath, fileName);
               filesNumber++;
               m_view->displayScannedFiles(filesNumber);

tdefilereplace/tdefilereplacepart.h

@@ -42,8 +42,9 @@ class TDEFileReplacePart: public KParts::ReadOnlyPart
     TDEAboutApplication* m_aboutDlg;
     KeyValueMap m_replacementMap;
     RCOptions* m_option;
-    bool m_stop,
-         m_searchingOperation;
+    bool m_stop;
+    bool m_searchingOperation;
+    bool m_circ_ref_warning_shown;
     int m_optionMask;
 
   public://Constructors