From 5c6b8a5f0473c6ec04dd045029eb0d87353558ab Mon Sep 17 00:00:00 2001
From: Miodrag Milanovic <mmicko@gmail.com>
Date: Wed, 30 Jun 2021 10:10:18 +0200
Subject: [PATCH] Preserve ArchArgs and reinit Context when applicable in GUI

---
 common/command.cc | 9 ---------
 common/context.h  | 6 +++++-
 gui/basewindow.cc | 7 ++++++-
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/common/command.cc b/common/command.cc
index 89bbf90c..7f276193 100644
--- a/common/command.cc
+++ b/common/command.cc
@@ -475,15 +475,6 @@ int CommandHandler::exec()
 
 void CommandHandler::load_json(Context *ctx, std::string filename)
 {
-    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);
     {
diff --git a/common/context.h b/common/context.h
index ee7ef0ce..f2b66600 100644
--- a/common/context.h
+++ b/common/context.h
@@ -37,7 +37,11 @@ struct Context : Arch, DeterministicRNG
     // Should we disable printing of the location of nets in the critical path?
     bool disable_critical_path_source_print = false;
 
-    Context(ArchArgs args) : Arch(args) { BaseCtx::as_ctx = this; }
+    ArchArgs arch_args;
+
+    Context(ArchArgs args) : Arch(args) { BaseCtx::as_ctx = this; arch_args = args; }
+
+    ArchArgs getArchArgs() { return arch_args; }
 
     // --------------------------------------------------------------
 
diff --git a/gui/basewindow.cc b/gui/basewindow.cc
index 80785199..e93428cf 100644
--- a/gui/basewindow.cc
+++ b/gui/basewindow.cc
@@ -365,6 +365,11 @@ void BaseMainWindow::open_json()
     QString fileName = QFileDialog::getOpenFileName(this, QString("Open JSON"), QString(), QString("*.json"));
     if (!fileName.isEmpty()) {
         disableActions();
+        if (ctx->settings.find(ctx->id("synth")) == ctx->settings.end()) {
+            ArchArgs chipArgs = ctx->getArchArgs();
+            ctx = std::unique_ptr<Context>(new Context(chipArgs));
+            Q_EMIT contextChanged(ctx.get());
+        }
         handler->load_json(ctx.get(), fileName.toStdString());
         Q_EMIT updateTreeView();
         log("Loading design successful.\n");
@@ -523,7 +528,7 @@ void BaseMainWindow::place() { Q_EMIT task->place(timing_driven); }
 
 void BaseMainWindow::disableActions()
 {
-    actionLoadJSON->setEnabled(false);
+    actionLoadJSON->setEnabled(true);
     actionPack->setEnabled(false);
     actionAssignBudget->setEnabled(false);
     actionPlace->setEnabled(false);