From 02ed6746a16559166b6931f2a45f756a1d75a40d Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Fri, 5 Dec 2025 09:55:27 +0100
Subject: [PATCH] rogueviz:: dhrg;: legacy invocations

---
 rogueviz/dhrg/dhrg.cpp   |  4 ++--
 rogueviz/dhrg/legacy.cpp | 45 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 2 deletions(-)
 create mode 100644 rogueviz/dhrg/legacy.cpp

diff --git a/rogueviz/dhrg/dhrg.cpp b/rogueviz/dhrg/dhrg.cpp
index 9a32c91e..e1fd2e16 100644
--- a/rogueviz/dhrg/dhrg.cpp
+++ b/rogueviz/dhrg/dhrg.cpp
@@ -2,8 +2,6 @@
 
 #include "dhrg.h"
 
-namespace rogueviz { extern string fname; }
-
 #include "regular.cpp"
 #include "gridmapping.cpp"
 #include "mycell.cpp"
@@ -175,3 +173,5 @@ auto hook =
 #endif
 
 }
+
+#include "legacy.cpp"
diff --git a/rogueviz/dhrg/legacy.cpp b/rogueviz/dhrg/legacy.cpp
new file mode 100644
index 00000000..411b1a0e
--- /dev/null
+++ b/rogueviz/dhrg/legacy.cpp
@@ -0,0 +1,45 @@
+#include "dhrg.h"
+
+namespace dhrg {
+
+string legacy_dhrg_name;
+
+int dhrg_legacy_args() {
+  using namespace arg;
+           
+  if(argis("-graph") || argis("-dhrg")) {
+    PHASE(3); shift();
+    legacy_dhrg_name = args();
+    rogueviz::embeddings::read_edgelist(legacy_dhrg_name + "-links.txt");
+    rogueviz::embeddings::read_polar(legacy_dhrg_name + "-coordinates.txt");
+    dhrg_init(); graph_from_rv();
+    next_timestamp++;
+    ts_rogueviz = next_timestamp;
+    ts_vertices = next_timestamp;
+    }
+
+  else if(argis("-esave")) {
+    fhstream f(legacy_dhrg_name + "-dhrg.txt", "wt");
+    if(!f.f) { file_error(legacy_dhrg_name); return 0; }
+    rogueviz::embeddings::current->save(f);
+    }
+
+  else if(argis("-eload")) {
+    PHASE(3); shift();
+    legacy_dhrg_name = args();
+    rogueviz::embeddings::read_edgelist(legacy_dhrg_name + "-links.txt");
+    dhrg_init(); load_embedded(legacy_dhrg_name + "-dhrg.txt");
+    next_timestamp++;
+    ts_rogueviz = next_timestamp;
+    ts_vertices = next_timestamp;
+    }
+
+  else return 1;
+
+  return 0;
+  }
+
+auto legacy_hook = 
+    addHook(hooks_args, 50, dhrg_legacy_args);
+
+}