support versioning the project template and triggering regeneration of the user project

radiant/mainframe.cpp

@@ -3638,6 +3638,7 @@ void MainFrame::CreateQEChildren(){
 		char buf[PATH_MAX];
 		const char *r;
 		bool bTriedTemplate = false;
+        int templateVersion = 0;
 
 		if ( g_PrefsDlg.m_nLastProjectVer != 0 && g_PrefsDlg.m_nLastProjectVer != PROJECT_VERSION ) {
 			// we need to regenerate from template
@@ -3645,9 +3646,17 @@ void MainFrame::CreateQEChildren(){
 			g_PrefsDlg.m_strLastProject = "";
 		}
 
+        
+        // check to see if the project template is versioned
+        strcpy( buf, g_pGameDescription->mEnginePath.GetBuffer() );
+        strcat( buf, g_pGameDescription->mBaseGame.GetBuffer() );
+        strcat( buf, "/scripts/" );
+        strcat( buf, PROJECT_TEMPLATE_NAME );
+        templateVersion = QE_GetTemplateVersionForProject( buf );
+
 		r = g_PrefsDlg.m_strLastProject.GetBuffer();
 
-		while ( r == NULL || *r == '\0' || access( r, R_OK ) != 0 || !QE_LoadProject( r ) )
+		while ( r == NULL || *r == '\0' || access( r, R_OK ) != 0 || !QE_LoadProject( r ) || templateVersion != IntForKey( g_qeglobals.d_project_entity, "template_version" ) )
 		{
 			if ( !bTriedTemplate ) {
 				// try default project location
@@ -3666,8 +3675,7 @@ void MainFrame::CreateQEChildren(){
 				filename = file_dialog( m_pWidget, TRUE, _( "Choose Project File" ), buf, "project" );
 				if ( filename != NULL ) {
 					r = filename;
-				}
+				} else {
-				else{
 					Error( "Cannot continue without loading a project..." );
 				}
 			}

radiant/qe3.cpp

@@ -472,6 +472,50 @@ void ReplaceTemplates( char* w, const char* r ){
 	*w = '\0';
 }
 
+/*
+Load up a project file to get the current version
+ */
+int QE_GetTemplateVersionForProject( const char * projectfile ) {
+  xmlDocPtr doc;
+  xmlNodePtr node, project;
+  int ret;
+
+  Sys_Printf( "Scanning template version in %s\n", projectfile );
+  doc = ParseXMLFile( projectfile, true );
+  if ( doc == NULL ) {
+    Sys_FPrintf( SYS_ERR, "ERROR: XML parse failed %s\n", projectfile );
+    return 0;
+  }
+  node = doc->children;
+  while ( node != NULL && node->type != XML_DTD_NODE ) {
+    node = node->next;
+  }
+  if ( node == NULL || strcmp( (char*)node->name, "project" ) != 0 ) {
+    Sys_FPrintf( SYS_ERR, "ERROR: invalid file type %s\n", projectfile );
+    xmlFree( doc );
+    return 0;
+  }
+  while ( node->type != XML_ELEMENT_NODE ) {
+    node = node->next;
+  }
+  // <project>
+  project = node;
+
+  for ( node = project->children; node != NULL; node = node->next ) {
+    if ( node->type != XML_ELEMENT_NODE ) {
+      continue;
+    }
+    if ( strcmp( (char*)node->properties->children->content, "template_version" ) == 0 ) {
+      ret = atoi( (char*)node->properties->next->children->content );
+      xmlFreeDoc( doc );
+      return ret;
+    }
+  }
+  Sys_FPrintf( SYS_WRN, "Version key not found in %s\n", projectfile );
+  xmlFreeDoc( doc );
+  return 0;
+}
+
 /*
    ===========
    QE_LoadProject

radiant/qe3.h

@@ -337,6 +337,8 @@ qboolean QE_KeyDown( int key, int nFlags = 0 );
 // does some sanity checks on the project entity, such as removing ending filename seperators from paths
 // (this usually gets propagated to the actual project file since most of the time we save right after calling the check)
 void     QE_CheckProjectEntity();
+// peek in a project file to retrieve the version key
+int		QE_GetTemplateVersionForProject( const char * projectfile );
 // this will load a new project entity in memory, and potentially process it from a template
 // NOTE TTimo calling QE_LoadProject won't take care of the various initialisation that are performed depending on the project settings
 //   you should then call QE_Init for that