Merge pull request #2288 from KLayout/bugfix/issue-2284

Implemented backup files for the configuration file

src/laybasic/laybasic/gsiDeclLayDispatcher.cc

@@ -71,12 +71,17 @@ Class<lay::Dispatcher> decl_Dispatcher ("lay", "Dispatcher",
     "\n"
     "@return The instance\n"
   ) +
-  method ("write_config", &lay::Dispatcher::write_config, gsi::arg ("file_name"),
+  method ("write_config", &lay::Dispatcher::write_config, gsi::arg ("file_name"), gsi::arg ("keep_backups", 0),
     "@brief Writes configuration to a file\n"
     "@return A value indicating whether the operation was successful\n"
     "\n"
     "If the configuration file cannot be written, false \n"
     "is returned but no exception is thrown.\n"
+    "\n"
+    "@param file_name The path to write the config file to.\n"
+    "@param keep_backups The number of backups to keep (0 for 'no backups').\n"
+    "\n"
+    "The 'keep_backups' option was introduced in version 0.30.7.\n"
   ) +
   method ("read_config", &lay::Dispatcher::read_config, gsi::arg ("file_name"),
     "@brief Reads the configuration from a file\n"

src/laybasic/laybasic/layDispatcher.cc

@@ -238,10 +238,10 @@ config_structure (const lay::Dispatcher *plugin)
 
 
 bool
-Dispatcher::write_config (const std::string &config_file)
+Dispatcher::write_config (const std::string &config_file, int keep_backups)
 {
   try {
-    tl::OutputStream os (config_file, tl::OutputStream::OM_Plain);
+    tl::OutputStream os (config_file, tl::OutputStream::OM_Plain, true, keep_backups);
     config_structure (this).write (os, *this);
     return true;
   } catch (...) {

src/laybasic/laybasic/layDispatcher.h

@@ -147,9 +147,12 @@ public:
    *  If the configuration file cannot be written, false
    *  is returned but no exception is thrown.
    *
+   *  "keep_backups" is the number of backup files kept.
+   *  By default, no backups are kept.
+   *
    *  @return false, if an error occurred.
    */
-  bool write_config (const std::string &config_file);
+  bool write_config (const std::string &config_file, int keep_backups = 0);
 
   /**
    *  @brief Read the configuration from a file