3 files changed, 16 insertions, 11 deletions
diff --git a/common/command.cc b/common/command.cc
index 27e59260..3341b521 100644
--- a/common/command.cc
+++ b/common/command.cc
@@ -473,19 +473,24 @@ int CommandHandler::exec()
     }
 }
 
-std::unique_ptr<Context> CommandHandler::load_json(std::string filename)
+void CommandHandler::load_json(Context *ctx, std::string filename)
 {
-    dict<std::string, Property> values;
-    std::unique_ptr<Context> ctx = createContext(values);
-    setupContext(ctx.get());
-    setupArchContext(ctx.get());
+    ctx->cells.clear();
+    ctx->nets.clear();
+    ctx->net_aliases.clear();
+    ctx->ports.clear();
+    ctx->hierarchy.clear();
+    ctx->settings.erase(ctx->id("pack"));
+    ctx->settings.erase(ctx->id("place"));
+    ctx->settings.erase(ctx->id("route"));
+
+    setupContext(ctx);
+    setupArchContext(ctx);
     {
         std::ifstream f(filename);
-        if (!parse_json(f, filename, ctx.get()))
+        if (!parse_json(f, filename, ctx))
             log_error("Loading design failed.\n");
     }
-    customAfterLoad(ctx.get());
-    return ctx;
 }
 
 void CommandHandler::clear() { vm.clear(); }
diff --git a/common/command.h b/common/command.h
index ba606ea2..c82bcd3a 100644
--- a/common/command.h
+++ b/common/command.h
@@ -37,7 +37,7 @@ class CommandHandler
     virtual ~CommandHandler(){};
 
     int exec();
-    std::unique_ptr<Context> load_json(std::string filename);
+    void load_json(Context *ctx, std::string filename);
     void clear();
 
   protected:
diff --git a/gui/basewindow.cc b/gui/basewindow.cc
index 08cbafe4..50eb2e52 100644
--- a/gui/basewindow.cc
+++ b/gui/basewindow.cc
@@ -30,6 +30,7 @@
 #include <fstream>
 #include "designwidget.h"
 #include "fpgaviewwidget.h"
+#include "json_frontend.h"
 #include "jsonwrite.h"
 #include "log.h"
 #include "mainwindow.h"
@@ -364,8 +365,7 @@ void BaseMainWindow::open_json()
     QString fileName = QFileDialog::getOpenFileName(this, QString("Open JSON"), QString(), QString("*.json"));
     if (!fileName.isEmpty()) {
         disableActions();
-        ctx = handler->load_json(fileName.toStdString());
-        Q_EMIT contextChanged(ctx.get());
+        handler->load_json(ctx.get(), fileName.toStdString());
         Q_EMIT updateTreeView();
         log("Loading design successful.\n");
         updateActions();